proper migration to gamerules for keep spawn loaded distance

1 files changed, 0 insertions, 5429 deletions

diff --git a/patches/server/0981-Starlight.patch b/patches/server/0981-Starlight.patch
deleted file mode 100644
index 72b56b3d53..0000000000
--- a/patches/server/0981-Starlight.patch
+++ /dev/null
@@ -1,5429 +0,0 @@
-From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
-From: Spottedleaf <[email protected]>
-Date: Wed, 28 Oct 2020 16:51:55 -0700
-Subject: [PATCH] Starlight
-
-See https://github.com/PaperMC/Starlight
-
-== AT ==
-public net.minecraft.server.level.ChunkHolder broadcast(Lnet/minecraft/network/protocol/Packet;Z)V
-
-diff --git a/src/main/java/ca/spottedleaf/starlight/common/light/BlockStarLightEngine.java b/src/main/java/ca/spottedleaf/starlight/common/light/BlockStarLightEngine.java
-new file mode 100644
-index 0000000000000000000000000000000000000000..3732a940d9603cf502983afbc4663113d1400be8
---- /dev/null
-+++ b/src/main/java/ca/spottedleaf/starlight/common/light/BlockStarLightEngine.java
-@@ -0,0 +1,275 @@
-+package ca.spottedleaf.starlight.common.light;
-+
-+import net.minecraft.core.BlockPos;
-+import net.minecraft.world.level.Level;
-+import net.minecraft.world.level.block.state.BlockState;
-+import net.minecraft.world.level.chunk.ChunkAccess;
-+import net.minecraft.world.level.chunk.status.ChunkStatus;
-+import net.minecraft.world.level.chunk.LevelChunkSection;
-+import net.minecraft.world.level.chunk.LightChunkGetter;
-+import net.minecraft.world.level.chunk.PalettedContainer;
-+import net.minecraft.world.phys.shapes.Shapes;
-+import net.minecraft.world.phys.shapes.VoxelShape;
-+import java.util.ArrayList;
-+import java.util.List;
-+import java.util.Set;
-+
-+public final class BlockStarLightEngine extends StarLightEngine {
-+
-+    public BlockStarLightEngine(final Level world) {
-+        super(false, world);
-+    }
-+
-+    @Override
-+    protected boolean[] getEmptinessMap(final ChunkAccess chunk) {
-+        return chunk.getBlockEmptinessMap();
-+    }
-+
-+    @Override
-+    protected void setEmptinessMap(final ChunkAccess chunk, final boolean[] to) {
-+        chunk.setBlockEmptinessMap(to);
-+    }
-+
-+    @Override
-+    protected SWMRNibbleArray[] getNibblesOnChunk(final ChunkAccess chunk) {
-+        return chunk.getBlockNibbles();
-+    }
-+
-+    @Override
-+    protected void setNibbles(final ChunkAccess chunk, final SWMRNibbleArray[] to) {
-+        chunk.setBlockNibbles(to);
-+    }
-+
-+    @Override
-+    protected boolean canUseChunk(final ChunkAccess chunk) {
-+        return chunk.getStatus().isOrAfter(ChunkStatus.LIGHT) && (this.isClientSide || chunk.isLightCorrect());
-+    }
-+
-+    @Override
-+    protected void setNibbleNull(final int chunkX, final int chunkY, final int chunkZ) {
-+        final SWMRNibbleArray nibble = this.getNibbleFromCache(chunkX, chunkY, chunkZ);
-+        if (nibble != null) {
-+            // de-initialisation is not as straightforward as with sky data, since deinit of block light is typically
-+            // because a block was removed - which can decrease light. with sky data, block breaking can only result
-+            // in increases, and thus the existing sky block check will actually correctly propagate light through
-+            // a null section. so in order to propagate decreases correctly, we can do a couple of things: not remove
-+            // the data section, or do edge checks on ALL axis (x, y, z). however I do not want edge checks running
-+            // for clients at all, as they are expensive. so we don't remove the section, but to maintain the appearence
-+            // of vanilla data management we "hide" them.
-+            nibble.setHidden();
-+        }
-+    }
-+
-+    @Override
-+    protected void initNibble(final int chunkX, final int chunkY, final int chunkZ, final boolean extrude, final boolean initRemovedNibbles) {
-+        if (chunkY < this.minLightSection || chunkY > this.maxLightSection || this.getChunkInCache(chunkX, chunkZ) == null) {
-+            return;
-+        }
-+
-+        final SWMRNibbleArray nibble = this.getNibbleFromCache(chunkX, chunkY, chunkZ);
-+        if (nibble == null) {
-+            if (!initRemovedNibbles) {
-+                throw new IllegalStateException();
-+            } else {
-+                this.setNibbleInCache(chunkX, chunkY, chunkZ, new SWMRNibbleArray());
-+            }
-+        } else {
-+            nibble.setNonNull();
-+        }
-+    }
-+
-+    @Override
-+    protected final void checkBlock(final LightChunkGetter lightAccess, final int worldX, final int worldY, final int worldZ) {
-+        // blocks can change opacity
-+        // blocks can change emitted light
-+        // blocks can change direction of propagation
-+
-+        final int encodeOffset = this.coordinateOffset;
-+        final int emittedMask = this.emittedLightMask;
-+
-+        final int currentLevel = this.getLightLevel(worldX, worldY, worldZ);
-+        final BlockState blockState = this.getBlockState(worldX, worldY, worldZ);
-+        final int emittedLevel = blockState.getLightEmission() & emittedMask;
-+
-+        this.setLightLevel(worldX, worldY, worldZ, emittedLevel);
-+        // this accounts for change in emitted light that would cause an increase
-+        if (emittedLevel != 0) {
-+            this.appendToIncreaseQueue(
-+                    ((worldX + (worldZ << 6) + (worldY << (6 + 6)) + encodeOffset) & ((1L << (6 + 6 + 16)) - 1))
-+                            | (emittedLevel & 0xFL) << (6 + 6 + 16)
-+                            | (((long)ALL_DIRECTIONS_BITSET) << (6 + 6 + 16 + 4))
-+                            | (blockState.isConditionallyFullOpaque() ? FLAG_HAS_SIDED_TRANSPARENT_BLOCKS : 0)
-+            );
-+        }
-+        // this also accounts for a change in emitted light that would cause a decrease
-+        // this also accounts for the change of direction of propagation (i.e old block was full transparent, new block is full opaque or vice versa)
-+        // as it checks all neighbours (even if current level is 0)
-+        this.appendToDecreaseQueue(
-+                ((worldX + (worldZ << 6) + (worldY << (6 + 6)) + encodeOffset) & ((1L << (6 + 6 + 16)) - 1))
-+                        | (currentLevel & 0xFL) << (6 + 6 + 16)
-+                        | (((long)ALL_DIRECTIONS_BITSET) << (6 + 6 + 16 + 4))
-+                        // always keep sided transparent false here, new block might be conditionally transparent which would
-+                        // prevent us from decreasing sources in the directions where the new block is opaque
-+                        // if it turns out we were wrong to de-propagate the source, the re-propagate logic WILL always
-+                        // catch that and fix it.
-+        );
-+        // re-propagating neighbours (done by the decrease queue) will also account for opacity changes in this block
-+    }
-+
-+    protected final BlockPos.MutableBlockPos recalcCenterPos = new BlockPos.MutableBlockPos();
-+    protected final BlockPos.MutableBlockPos recalcNeighbourPos = new BlockPos.MutableBlockPos();
-+
-+    @Override
-+    protected int calculateLightValue(final LightChunkGetter lightAccess, final int worldX, final int worldY, final int worldZ,
-+                                      final int expect) {
-+        final BlockState centerState = this.getBlockState(worldX, worldY, worldZ);
-+        int level = centerState.getLightEmission() & 0xF;
-+
-+        if (level >= (15 - 1) || level > expect) {
-+            return level;
-+        }
-+
-+        final int sectionOffset = this.chunkSectionIndexOffset;
-+        final BlockState conditionallyOpaqueState;
-+        int opacity = centerState.getOpacityIfCached();
-+
-+        if (opacity == -1) {
-+            this.recalcCenterPos.set(worldX, worldY, worldZ);
-+            opacity = centerState.getLightBlock(lightAccess.getLevel(), this.recalcCenterPos);
-+            if (centerState.isConditionallyFullOpaque()) {
-+                conditionallyOpaqueState = centerState;
-+            } else {
-+                conditionallyOpaqueState = null;
-+            }
-+        } else if (opacity >= 15) {
-+            return level;
-+        } else {
-+            conditionallyOpaqueState = null;
-+        }
-+        opacity = Math.max(1, opacity);
-+
-+        for (final AxisDirection direction : AXIS_DIRECTIONS) {
-+            final int offX = worldX + direction.x;
-+            final int offY = worldY + direction.y;
-+            final int offZ = worldZ + direction.z;
-+
-+            final int sectionIndex = (offX >> 4) + 5 * (offZ >> 4) + (5 * 5) * (offY >> 4) + sectionOffset;
-+
-+            final int neighbourLevel = this.getLightLevel(sectionIndex, (offX & 15) | ((offZ & 15) << 4) | ((offY & 15) << 8));
-+
-+            if ((neighbourLevel - 1) <= level) {
-+                // don't need to test transparency, we know it wont affect the result.
-+                continue;
-+            }
-+
-+            final BlockState neighbourState = this.getBlockState(offX, offY, offZ);
-+            if (neighbourState.isConditionallyFullOpaque()) {
-+                // here the block can be conditionally opaque (i.e light cannot propagate from it), so we need to test that
-+                // we don't read the blockstate because most of the time this is false, so using the faster
-+                // known transparency lookup results in a net win
-+                this.recalcNeighbourPos.set(offX, offY, offZ);
-+                final VoxelShape neighbourFace = neighbourState.getFaceOcclusionShape(lightAccess.getLevel(), this.recalcNeighbourPos, direction.opposite.nms);
-+                final VoxelShape thisFace = conditionallyOpaqueState == null ? Shapes.empty() : conditionallyOpaqueState.getFaceOcclusionShape(lightAccess.getLevel(), this.recalcCenterPos, direction.nms);
-+                if (Shapes.faceShapeOccludes(thisFace, neighbourFace)) {
-+                    // not allowed to propagate
-+                    continue;
-+                }
-+            }
-+
-+            // passed transparency,
-+
-+            final int calculated = neighbourLevel - opacity;
-+            level = Math.max(calculated, level);
-+            if (level > expect) {
-+                return level;
-+            }
-+        }
-+
-+        return level;
-+    }
-+
-+    @Override
-+    protected void propagateBlockChanges(final LightChunkGetter lightAccess, final ChunkAccess atChunk, final Set<BlockPos> positions) {
-+        for (final BlockPos pos : positions) {
-+            this.checkBlock(lightAccess, pos.getX(), pos.getY(), pos.getZ());
-+        }
-+
-+        this.performLightDecrease(lightAccess);
-+    }
-+
-+    protected List<BlockPos> getSources(final LightChunkGetter lightAccess, final ChunkAccess chunk) {
-+        final List<BlockPos> sources = new ArrayList<>();
-+
-+        final int offX = chunk.getPos().x << 4;
-+        final int offZ = chunk.getPos().z << 4;
-+
-+        final LevelChunkSection[] sections = chunk.getSections();
-+        for (int sectionY = this.minSection; sectionY <= this.maxSection; ++sectionY) {
-+            final LevelChunkSection section = sections[sectionY - this.minSection];
-+            if (section == null || section.hasOnlyAir()) {
-+                // no sources in empty sections
-+                continue;
-+            }
-+            if (!section.maybeHas((final BlockState state) -> {
-+                return state.getLightEmission() > 0;
-+            })) {
-+                // no light sources in palette
-+                continue;
-+            }
-+            final PalettedContainer<BlockState> states = section.states;
-+            final int offY = sectionY << 4;
-+
-+            for (int index = 0; index < (16 * 16 * 16); ++index) {
-+                final BlockState state = states.get(index);
-+                if (state.getLightEmission() <= 0) {
-+                    continue;
-+                }
-+
-+                // index = x | (z << 4) | (y << 8)
-+                sources.add(new BlockPos(offX | (index & 15), offY | (index >>> 8), offZ | ((index >>> 4) & 15)));
-+            }
-+        }
-+
-+        return sources;
-+    }
-+
-+    @Override
-+    public void lightChunk(final LightChunkGetter lightAccess, final ChunkAccess chunk, final boolean needsEdgeChecks) {
-+        // setup sources
-+        final int emittedMask = this.emittedLightMask;
-+        final List<BlockPos> positions = this.getSources(lightAccess, chunk);
-+        for (int i = 0, len = positions.size(); i < len; ++i) {
-+            final BlockPos pos = positions.get(i);
-+            final BlockState blockState = this.getBlockState(pos.getX(), pos.getY(), pos.getZ());
-+            final int emittedLight = blockState.getLightEmission() & emittedMask;
-+
-+            if (emittedLight <= this.getLightLevel(pos.getX(), pos.getY(), pos.getZ())) {
-+                // some other source is brighter
-+                continue;
-+            }
-+
-+            this.appendToIncreaseQueue(
-+                    ((pos.getX() + (pos.getZ() << 6) + (pos.getY() << (6 + 6)) + this.coordinateOffset) & ((1L << (6 + 6 + 16)) - 1))
-+                            | (emittedLight & 0xFL) << (6 + 6 + 16)
-+                            | (((long)ALL_DIRECTIONS_BITSET) << (6 + 6 + 16 + 4))
-+                            | (blockState.isConditionallyFullOpaque() ? FLAG_HAS_SIDED_TRANSPARENT_BLOCKS : 0)
-+            );
-+
-+
-+            // propagation wont set this for us
-+            this.setLightLevel(pos.getX(), pos.getY(), pos.getZ(), emittedLight);
-+        }
-+
-+        if (needsEdgeChecks) {
-+            // not required to propagate here, but this will reduce the hit of the edge checks
-+            this.performLightIncrease(lightAccess);
-+
-+            // verify neighbour edges
-+            this.checkChunkEdges(lightAccess, chunk, this.minLightSection, this.maxLightSection);
-+        } else {
-+            this.propagateNeighbourLevels(lightAccess, chunk, this.minLightSection, this.maxLightSection);
-+
-+            this.performLightIncrease(lightAccess);
-+        }
-+    }
-+}
-diff --git a/src/main/java/ca/spottedleaf/starlight/common/light/SWMRNibbleArray.java b/src/main/java/ca/spottedleaf/starlight/common/light/SWMRNibbleArray.java
-new file mode 100644
-index 0000000000000000000000000000000000000000..4ffb4ffe01c4628d52742c5c0bbd35220eea6294
---- /dev/null
-+++ b/src/main/java/ca/spottedleaf/starlight/common/light/SWMRNibbleArray.java
-@@ -0,0 +1,440 @@
-+package ca.spottedleaf.starlight.common.light;
-+
-+import net.minecraft.world.level.chunk.DataLayer;
-+import java.util.ArrayDeque;
-+import java.util.Arrays;
-+
-+// SWMR -> Single Writer Multi Reader Nibble Array
-+public final class SWMRNibbleArray {
-+
-+    /*
-+     * Null nibble - nibble does not exist, and should not be written to. Just like vanilla - null
-+     * nibbles are always 0 - and they are never written to directly. Only initialised/uninitialised
-+     * nibbles can be written to.
-+     *
-+     * Uninitialised nibble - They are all 0, but the backing array isn't initialised.
-+     *
-+     * Initialised nibble - Has light data.
-+     */
-+
-+    protected static final int INIT_STATE_NULL   = 0; // null
-+    protected static final int INIT_STATE_UNINIT = 1; // uninitialised
-+    protected static final int INIT_STATE_INIT   = 2; // initialised
-+    protected static final int INIT_STATE_HIDDEN = 3; // initialised, but conversion to Vanilla data should be treated as if NULL
-+
-+    public static final int ARRAY_SIZE = 16 * 16 * 16 / (8/4); // blocks / bytes per block
-+    // this allows us to maintain only 1 byte array when we're not updating
-+    static final ThreadLocal<ArrayDeque<byte[]>> WORKING_BYTES_POOL = ThreadLocal.withInitial(ArrayDeque::new);
-+
-+    private static byte[] allocateBytes() {
-+        final byte[] inPool = WORKING_BYTES_POOL.get().pollFirst();
-+        if (inPool != null) {
-+            return inPool;
-+        }
-+
-+        return new byte[ARRAY_SIZE];
-+    }
-+
-+    private static void freeBytes(final byte[] bytes) {
-+        WORKING_BYTES_POOL.get().addFirst(bytes);
-+    }
-+
-+    public static SWMRNibbleArray fromVanilla(final DataLayer nibble) {
-+        if (nibble == null) {
-+            return new SWMRNibbleArray(null, true);
-+        } else if (nibble.isEmpty()) {
-+            return new SWMRNibbleArray();
-+        } else {
-+            return new SWMRNibbleArray(nibble.getData().clone()); // make sure we don't write to the parameter later
-+        }
-+    }
-+
-+    protected int stateUpdating;
-+    protected volatile int stateVisible;
-+
-+    protected byte[] storageUpdating;
-+    protected boolean updatingDirty; // only returns whether storageUpdating is dirty
-+    protected volatile byte[] storageVisible;
-+
-+    public SWMRNibbleArray() {
-+        this(null, false); // lazy init
-+    }
-+
-+    public SWMRNibbleArray(final byte[] bytes) {
-+        this(bytes, false);
-+    }
-+
-+    public SWMRNibbleArray(final byte[] bytes, final boolean isNullNibble) {
-+        if (bytes != null && bytes.length != ARRAY_SIZE) {
-+            throw new IllegalArgumentException("Data of wrong length: " + bytes.length);
-+        }
-+        this.stateVisible = this.stateUpdating = bytes == null ? (isNullNibble ? INIT_STATE_NULL : INIT_STATE_UNINIT) : INIT_STATE_INIT;
-+        this.storageUpdating = this.storageVisible = bytes;
-+    }
-+
-+    public SWMRNibbleArray(final byte[] bytes, final int state) {
-+        if (bytes != null && bytes.length != ARRAY_SIZE) {
-+            throw new IllegalArgumentException("Data of wrong length: " + bytes.length);
-+        }
-+        if (bytes == null && (state == INIT_STATE_INIT || state == INIT_STATE_HIDDEN)) {
-+            throw new IllegalArgumentException("Data cannot be null and have state be initialised");
-+        }
-+        this.stateUpdating = this.stateVisible = state;
-+        this.storageUpdating = this.storageVisible = bytes;
-+    }
-+
-+    @Override
-+    public String toString() {
-+        StringBuilder stringBuilder = new StringBuilder();
-+        stringBuilder.append("State: ");
-+        switch (this.stateVisible) {
-+            case INIT_STATE_NULL:
-+                stringBuilder.append("null");
-+                break;
-+            case INIT_STATE_UNINIT:
-+                stringBuilder.append("uninitialised");
-+                break;
-+            case INIT_STATE_INIT:
-+                stringBuilder.append("initialised");
-+                break;
-+            case INIT_STATE_HIDDEN:
-+                stringBuilder.append("hidden");
-+                break;
-+            default:
-+                stringBuilder.append("unknown");
-+                break;
-+        }
-+        stringBuilder.append("\nData:\n");
-+
-+        final byte[] data = this.storageVisible;
-+        if (data != null) {
-+            for (int i = 0; i < 4096; ++i) {
-+                // Copied from NibbleArray#toString
-+                final int level = ((data[i >>> 1] >>> ((i & 1) << 2)) & 0xF);
-+
-+                stringBuilder.append(Integer.toHexString(level));
-+                if ((i & 15) == 15) {
-+                    stringBuilder.append("\n");
-+                }
-+
-+                if ((i & 255) == 255) {
-+                    stringBuilder.append("\n");
-+                }
-+            }
-+        } else {
-+            stringBuilder.append("null");
-+        }
-+
-+        return stringBuilder.toString();
-+    }
-+
-+    public SaveState getSaveState() {
-+        synchronized (this) {
-+            final int state = this.stateVisible;
-+            final byte[] data = this.storageVisible;
-+            if (state == INIT_STATE_NULL) {
-+                return null;
-+            }
-+            if (state == INIT_STATE_UNINIT) {
-+                return new SaveState(null, state);
-+            }
-+            final boolean zero = isAllZero(data);
-+            if (zero) {
-+                return state == INIT_STATE_INIT ? new SaveState(null, INIT_STATE_UNINIT) : null;
-+            } else {
-+                return new SaveState(data.clone(), state);
-+            }
-+        }
-+    }
-+
-+    protected static boolean isAllZero(final byte[] data) {
-+        for (int i = 0; i < (ARRAY_SIZE >>> 4); ++i) {
-+            byte whole = data[i << 4];
-+
-+            for (int k = 1; k < (1 << 4); ++k) {
-+                whole |= data[(i << 4) | k];
-+            }
-+
-+            if (whole != 0) {
-+                return false;
-+            }
-+        }
-+
-+        return true;
-+    }
-+
-+    // operation type: updating on src, updating on other
-+    public void extrudeLower(final SWMRNibbleArray other) {
-+        if (other.stateUpdating == INIT_STATE_NULL) {
-+            throw new IllegalArgumentException();
-+        }
-+
-+        if (other.storageUpdating == null) {
-+            this.setUninitialised();
-+            return;
-+        }
-+
-+        final byte[] src = other.storageUpdating;
-+        final byte[] into;
-+
-+        if (!this.updatingDirty) {
-+            if (this.storageUpdating != null) {
-+                into = this.storageUpdating = allocateBytes();
-+            } else {
-+                this.storageUpdating = into = allocateBytes();
-+                this.stateUpdating = INIT_STATE_INIT;
-+            }
-+            this.updatingDirty = true;
-+        } else {
-+            into = this.storageUpdating;
-+        }
-+
-+        final int start = 0;
-+        final int end = (15 | (15 << 4)) >>> 1;
-+
-+        /* x | (z << 4) | (y << 8) */
-+        for (int y = 0; y <= 15; ++y) {
-+            System.arraycopy(src, start, into, y << (8 - 1), end - start + 1);
-+        }
-+    }
-+
-+    // operation type: updating
-+    public void setFull() {
-+        if (this.stateUpdating != INIT_STATE_HIDDEN) {
-+            this.stateUpdating = INIT_STATE_INIT;
-+        }
-+        Arrays.fill(this.storageUpdating == null || !this.updatingDirty ? this.storageUpdating = allocateBytes() : this.storageUpdating, (byte)-1);
-+        this.updatingDirty = true;
-+    }
-+
-+    // operation type: updating
-+    public void setZero() {
-+        if (this.stateUpdating != INIT_STATE_HIDDEN) {
-+            this.stateUpdating = INIT_STATE_INIT;
-+        }
-+        Arrays.fill(this.storageUpdating == null || !this.updatingDirty ? this.storageUpdating = allocateBytes() : this.storageUpdating, (byte)0);
-+        this.updatingDirty = true;
-+    }
-+
-+    // operation type: updating
-+    public void setNonNull() {
-+        if (this.stateUpdating == INIT_STATE_HIDDEN) {
-+            this.stateUpdating = INIT_STATE_INIT;
-+            return;
-+        }
-+        if (this.stateUpdating != INIT_STATE_NULL) {
-+            return;
-+        }
-+        this.stateUpdating = INIT_STATE_UNINIT;
-+    }
-+
-+    // operation type: updating
-+    public void setNull() {
-+        this.stateUpdating = INIT_STATE_NULL;
-+        if (this.updatingDirty && this.storageUpdating != null) {
-+            freeBytes(this.storageUpdating);
-+        }
-+        this.storageUpdating = null;
-+        this.updatingDirty = false;
-+    }
-+
-+    // operation type: updating
-+    public void setUninitialised() {
-+        this.stateUpdating = INIT_STATE_UNINIT;
-+        if (this.storageUpdating != null && this.updatingDirty) {
-+            freeBytes(this.storageUpdating);
-+        }
-+        this.storageUpdating = null;
-+        this.updatingDirty = false;
-+    }
-+
-+    // operation type: updating
-+    public void setHidden() {
-+        if (this.stateUpdating == INIT_STATE_HIDDEN) {
-+            return;
-+        }
-+        if (this.stateUpdating != INIT_STATE_INIT) {
-+            this.setNull();
-+        } else {
-+            this.stateUpdating = INIT_STATE_HIDDEN;
-+        }
-+    }
-+
-+    // operation type: updating
-+    public boolean isDirty() {
-+        return this.stateUpdating != this.stateVisible || this.updatingDirty;
-+    }
-+
-+    // operation type: updating
-+    public boolean isNullNibbleUpdating() {
-+        return this.stateUpdating == INIT_STATE_NULL;
-+    }
-+
-+    // operation type: visible
-+    public boolean isNullNibbleVisible() {
-+        return this.stateVisible == INIT_STATE_NULL;
-+    }
-+
-+    // opeartion type: updating
-+    public boolean isUninitialisedUpdating() {
-+        return this.stateUpdating == INIT_STATE_UNINIT;
-+    }
-+
-+    // operation type: visible
-+    public boolean isUninitialisedVisible() {
-+        return this.stateVisible == INIT_STATE_UNINIT;
-+    }
-+
-+    // operation type: updating
-+    public boolean isInitialisedUpdating() {
-+        return this.stateUpdating == INIT_STATE_INIT;
-+    }
-+
-+    // operation type: visible
-+    public boolean isInitialisedVisible() {
-+        return this.stateVisible == INIT_STATE_INIT;
-+    }
-+
-+    // operation type: updating
-+    public boolean isHiddenUpdating() {
-+        return this.stateUpdating == INIT_STATE_HIDDEN;
-+    }
-+
-+    // operation type: updating
-+    public boolean isHiddenVisible() {
-+        return this.stateVisible == INIT_STATE_HIDDEN;
-+    }
-+
-+    // operation type: updating
-+    protected void swapUpdatingAndMarkDirty() {
-+        if (this.updatingDirty) {
-+            return;
-+        }
-+
-+        if (this.storageUpdating == null) {
-+            this.storageUpdating = allocateBytes();
-+            Arrays.fill(this.storageUpdating, (byte)0);
-+        } else {
-+            System.arraycopy(this.storageUpdating, 0, this.storageUpdating = allocateBytes(), 0, ARRAY_SIZE);
-+        }
-+
-+        if (this.stateUpdating != INIT_STATE_HIDDEN) {
-+            this.stateUpdating = INIT_STATE_INIT;
-+        }
-+        this.updatingDirty = true;
-+    }
-+
-+    // operation type: updating
-+    public boolean updateVisible() {
-+        if (!this.isDirty()) {
-+            return false;
-+        }
-+
-+        synchronized (this) {
-+            if (this.stateUpdating == INIT_STATE_NULL || this.stateUpdating == INIT_STATE_UNINIT) {
-+                this.storageVisible = null;
-+            } else {
-+                if (this.storageVisible == null) {
-+                    this.storageVisible = this.storageUpdating.clone();
-+                } else {
-+                    if (this.storageUpdating != this.storageVisible) {
-+                        System.arraycopy(this.storageUpdating, 0, this.storageVisible, 0, ARRAY_SIZE);
-+                    }
-+                }
-+
-+                if (this.storageUpdating != this.storageVisible) {
-+                    freeBytes(this.storageUpdating);
-+                }
-+                this.storageUpdating = this.storageVisible;
-+            }
-+            this.updatingDirty = false;
-+            this.stateVisible = this.stateUpdating;
-+        }
-+
-+        return true;
-+    }
-+
-+    // operation type: visible
-+    public DataLayer toVanillaNibble() {
-+        synchronized (this) {
-+            switch (this.stateVisible) {
-+                case INIT_STATE_HIDDEN:
-+                case INIT_STATE_NULL:
-+                    return null;
-+                case INIT_STATE_UNINIT:
-+                    return new DataLayer();
-+                case INIT_STATE_INIT:
-+                    return new DataLayer(this.storageVisible.clone());
-+                default:
-+                    throw new IllegalStateException();
-+            }
-+        }
-+    }
-+
-+    /* x | (z << 4) | (y << 8) */
-+
-+    // operation type: updating
-+    public int getUpdating(final int x, final int y, final int z) {
-+        return this.getUpdating((x & 15) | ((z & 15) << 4) | ((y & 15) << 8));
-+    }
-+
-+    // operation type: updating
-+    public int getUpdating(final int index) {
-+        // indices range from 0 -> 4096
-+        final byte[] bytes = this.storageUpdating;
-+        if (bytes == null) {
-+            return 0;
-+        }
-+        final byte value = bytes[index >>> 1];
-+
-+        // if we are an even index, we want lower 4 bits
-+        // if we are an odd index, we want upper 4 bits
-+        return ((value >>> ((index & 1) << 2)) & 0xF);
-+    }
-+
-+    // operation type: visible
-+    public int getVisible(final int x, final int y, final int z) {
-+        return this.getVisible((x & 15) | ((z & 15) << 4) | ((y & 15) << 8));
-+    }
-+
-+    // operation type: visible
-+    public int getVisible(final int index) {
-+        // indices range from 0 -> 4096
-+        final byte[] visibleBytes = this.storageVisible;
-+        if (visibleBytes == null) {
-+            return 0;
-+        }
-+        final byte value = visibleBytes[index >>> 1];
-+
-+        // if we are an even index, we want lower 4 bits
-+        // if we are an odd index, we want upper 4 bits
-+        return ((value >>> ((index & 1) << 2)) & 0xF);
-+    }
-+
-+    // operation type: updating
-+    public void set(final int x, final int y, final int z, final int value) {
-+        this.set((x & 15) | ((z & 15) << 4) | ((y & 15) << 8), value);
-+    }
-+
-+    // operation type: updating
-+    public void set(final int index, final int value) {
-+        if (!this.updatingDirty) {
-+            this.swapUpdatingAndMarkDirty();
-+        }
-+        final int shift = (index & 1) << 2;
-+        final int i = index >>> 1;
-+
-+        this.storageUpdating[i] = (byte)((this.storageUpdating[i] & (0xF0 >>> shift)) | (value << shift));
-+    }
-+
-+    public static final class SaveState {
-+
-+        public final byte[] data;
-+        public final int state;
-+
-+        public SaveState(final byte[] data, final int state) {
-+            this.data = data;
-+            this.state = state;
-+        }
-+    }
-+}
-diff --git a/src/main/java/ca/spottedleaf/starlight/common/light/SkyStarLightEngine.java b/src/main/java/ca/spottedleaf/starlight/common/light/SkyStarLightEngine.java
-new file mode 100644
-index 0000000000000000000000000000000000000000..43a2cce467d29f81ba57d77c03608e57857dd579
---- /dev/null
-+++ b/src/main/java/ca/spottedleaf/starlight/common/light/SkyStarLightEngine.java
-@@ -0,0 +1,709 @@
-+package ca.spottedleaf.starlight.common.light;
-+
-+import ca.spottedleaf.starlight.common.util.WorldUtil;
-+import it.unimi.dsi.fastutil.shorts.ShortCollection;
-+import it.unimi.dsi.fastutil.shorts.ShortIterator;
-+import net.minecraft.core.BlockPos;
-+import net.minecraft.world.level.BlockGetter;
-+import net.minecraft.world.level.ChunkPos;
-+import net.minecraft.world.level.Level;
-+import net.minecraft.world.level.block.state.BlockState;
-+import net.minecraft.world.level.chunk.ChunkAccess;
-+import net.minecraft.world.level.chunk.status.ChunkStatus;
-+import net.minecraft.world.level.chunk.LevelChunkSection;
-+import net.minecraft.world.level.chunk.LightChunkGetter;
-+import net.minecraft.world.phys.shapes.Shapes;
-+import net.minecraft.world.phys.shapes.VoxelShape;
-+import java.util.Arrays;
-+import java.util.Set;
-+
-+public final class SkyStarLightEngine extends StarLightEngine {
-+
-+    /*
-+      Specification for managing the initialisation and de-initialisation of skylight nibble arrays:
-+
-+      Skylight nibble initialisation requires that non-empty chunk sections have 1 radius nibbles non-null.
-+
-+      This presents some problems, as vanilla is only guaranteed to have 0 radius neighbours loaded when editing blocks.
-+      However starlight fixes this so that it has 1 radius loaded. Still, we don't actually have guarantees
-+      that we have the necessary chunks loaded to de-initialise neighbour sections (but we do have enough to de-initialise
-+      our own) - we need a radius of 2 to de-initialise neighbour nibbles.
-+      How do we solve this?
-+
-+      Each chunk will store the last known "emptiness" of sections for each of their 1 radius neighbour chunk sections.
-+      If the chunk does not have full data, then its nibbles are NOT de-initialised. This is because obviously the
-+      chunk did not go through the light stage yet - or its neighbours are not lit. In either case, once the last
-+      known "emptiness" of neighbouring sections is filled with data, the chunk will run a full check of the data
-+      to see if any of its nibbles need to be de-initialised.
-+
-+      The emptiness map allows us to de-initialise neighbour nibbles if the neighbour has it filled with data,
-+      and if it doesn't have data then we know it will correctly de-initialise once it fills up.
-+
-+      Unlike vanilla, we store whether nibbles are uninitialised on disk - so we don't need any dumb hacking
-+      around those.
-+     */
-+
-+    protected final int[] heightMapBlockChange = new int[16 * 16];
-+    {
-+        Arrays.fill(this.heightMapBlockChange, Integer.MIN_VALUE); // clear heightmap
-+    }
-+
-+    protected final boolean[] nullPropagationCheckCache;
-+
-+    public SkyStarLightEngine(final Level world) {
-+        super(true, world);
-+        this.nullPropagationCheckCache = new boolean[WorldUtil.getTotalLightSections(world)];
-+    }
-+
-+    @Override
-+    protected void initNibble(final int chunkX, final int chunkY, final int chunkZ, final boolean extrude, final boolean initRemovedNibbles) {
-+        if (chunkY < this.minLightSection || chunkY > this.maxLightSection || this.getChunkInCache(chunkX, chunkZ) == null) {
-+            return;
-+        }
-+        SWMRNibbleArray nibble = this.getNibbleFromCache(chunkX, chunkY, chunkZ);
-+        if (nibble == null) {
-+            if (!initRemovedNibbles) {
-+                throw new IllegalStateException();
-+            } else {
-+                this.setNibbleInCache(chunkX, chunkY, chunkZ, nibble = new SWMRNibbleArray(null, true));
-+            }
-+        }
-+        this.initNibble(nibble, chunkX, chunkY, chunkZ, extrude);
-+    }
-+
-+    @Override
-+    protected void setNibbleNull(final int chunkX, final int chunkY, final int chunkZ) {
-+        final SWMRNibbleArray nibble = this.getNibbleFromCache(chunkX, chunkY, chunkZ);
-+        if (nibble != null) {
-+            nibble.setNull();
-+        }
-+    }
-+
-+    protected final void initNibble(final SWMRNibbleArray currNibble, final int chunkX, final int chunkY, final int chunkZ, final boolean extrude) {
-+        if (!currNibble.isNullNibbleUpdating()) {
-+            // already initialised
-+            return;
-+        }
-+
-+        final boolean[] emptinessMap = this.getEmptinessMap(chunkX, chunkZ);
-+
-+        // are we above this chunk's lowest empty section?
-+        int lowestY = this.minLightSection - 1;
-+        for (int currY = this.maxSection; currY >= this.minSection; --currY) {
-+            if (emptinessMap == null) {
-+                // cannot delay nibble init for lit chunks, as we need to init to propagate into them.
-+                final LevelChunkSection current = this.getChunkSection(chunkX, currY, chunkZ);
-+                if (current == null || current.hasOnlyAir()) {
-+                    continue;
-+                }
-+            } else {
-+                if (emptinessMap[currY - this.minSection]) {
-+                    continue;
-+                }
-+            }
-+
-+            // should always be full lit here
-+            lowestY = currY;
-+            break;
-+        }
-+
-+        if (chunkY > lowestY) {
-+            // we need to set this one to full
-+            final SWMRNibbleArray nibble = this.getNibbleFromCache(chunkX, chunkY, chunkZ);
-+            nibble.setNonNull();
-+            nibble.setFull();
-+            return;
-+        }
-+
-+        if (extrude) {
-+            // this nibble is going to depend solely on the skylight data above it
-+            // find first non-null data above (there does exist one, as we just found it above)
-+            for (int currY = chunkY + 1; currY <= this.maxLightSection; ++currY) {
-+                final SWMRNibbleArray nibble = this.getNibbleFromCache(chunkX, currY, chunkZ);
-+                if (nibble != null && !nibble.isNullNibbleUpdating()) {
-+                    currNibble.setNonNull();
-+                    currNibble.extrudeLower(nibble);
-+                    break;
-+                }
-+            }
-+        } else {
-+            currNibble.setNonNull();
-+        }
-+    }
-+
-+    protected final void rewriteNibbleCacheForSkylight(final ChunkAccess chunk) {
-+        for (int index = 0, max = this.nibbleCache.length; index < max; ++index) {
-+            final SWMRNibbleArray nibble = this.nibbleCache[index];
-+            if (nibble != null && nibble.isNullNibbleUpdating()) {
-+                // stop propagation in these areas
-+                this.nibbleCache[index] = null;
-+                nibble.updateVisible();
-+            }
-+        }
-+    }
-+
-+    // rets whether neighbours were init'd
-+
-+    protected final boolean checkNullSection(final int chunkX, final int chunkY, final int chunkZ,
-+                                             final boolean extrudeInitialised) {
-+        // null chunk sections may have nibble neighbours in the horizontal 1 radius that are
-+        // non-null. Propagation to these neighbours is necessary.
-+        // What makes this easy is we know none of these neighbours are non-empty (otherwise
-+        // this nibble would be initialised). So, we don't have to initialise
-+        // the neighbours in the full 1 radius, because there's no worry that any "paths"
-+        // to the neighbours on this horizontal plane are blocked.
-+        if (chunkY < this.minLightSection || chunkY > this.maxLightSection || this.nullPropagationCheckCache[chunkY - this.minLightSection]) {
-+            return false;
-+        }
-+        this.nullPropagationCheckCache[chunkY - this.minLightSection] = true;
-+
-+        // check horizontal neighbours
-+        boolean needInitNeighbours = false;
-+        neighbour_search:
-+        for (int dz = -1; dz <= 1; ++dz) {
-+            for (int dx = -1; dx <= 1; ++dx) {
-+                final SWMRNibbleArray nibble = this.getNibbleFromCache(dx + chunkX, chunkY, dz + chunkZ);
-+                if (nibble != null && !nibble.isNullNibbleUpdating()) {
-+                    needInitNeighbours = true;
-+                    break neighbour_search;
-+                }
-+            }
-+        }
-+
-+        if (needInitNeighbours) {
-+            for (int dz = -1; dz <= 1; ++dz) {
-+                for (int dx = -1; dx <= 1; ++dx) {
-+                    this.initNibble(dx + chunkX, chunkY, dz + chunkZ, (dx | dz) == 0 ? extrudeInitialised : true, true);
-+                }
-+            }
-+        }
-+
-+        return needInitNeighbours;
-+    }
-+
-+    protected final int getLightLevelExtruded(final int worldX, final int worldY, final int worldZ) {
-+        final int chunkX = worldX >> 4;
-+        int chunkY = worldY >> 4;
-+        final int chunkZ = worldZ >> 4;
-+
-+        SWMRNibbleArray nibble = this.getNibbleFromCache(chunkX, chunkY, chunkZ);
-+        if (nibble != null) {
-+            return nibble.getUpdating(worldX, worldY, worldZ);
-+        }
-+
-+        for (;;) {
-+            if (++chunkY > this.maxLightSection) {
-+                return 15;
-+            }
-+
-+            nibble = this.getNibbleFromCache(chunkX, chunkY, chunkZ);
-+
-+            if (nibble != null) {
-+                return nibble.getUpdating(worldX, 0, worldZ);
-+            }
-+        }
-+    }
-+
-+    @Override
-+    protected boolean[] getEmptinessMap(final ChunkAccess chunk) {
-+        return chunk.getSkyEmptinessMap();
-+    }
-+
-+    @Override
-+    protected void setEmptinessMap(final ChunkAccess chunk, final boolean[] to) {
-+        chunk.setSkyEmptinessMap(to);
-+    }
-+
-+    @Override
-+    protected SWMRNibbleArray[] getNibblesOnChunk(final ChunkAccess chunk) {
-+        return chunk.getSkyNibbles();
-+    }
-+
-+    @Override
-+    protected void setNibbles(final ChunkAccess chunk, final SWMRNibbleArray[] to) {
-+        chunk.setSkyNibbles(to);
-+    }
-+
-+    @Override
-+    protected boolean canUseChunk(final ChunkAccess chunk) {
-+        // can only use chunks for sky stuff if their sections have been init'd
-+        return chunk.getStatus().isOrAfter(ChunkStatus.LIGHT) && (this.isClientSide || chunk.isLightCorrect());
-+    }
-+
-+    @Override
-+    protected void checkChunkEdges(final LightChunkGetter lightAccess, final ChunkAccess chunk, final int fromSection,
-+                                   final int toSection) {
-+        Arrays.fill(this.nullPropagationCheckCache, false);
-+        this.rewriteNibbleCacheForSkylight(chunk);
-+        final int chunkX = chunk.getPos().x;
-+        final int chunkZ = chunk.getPos().z;
-+        for (int y = toSection; y >= fromSection; --y) {
-+            this.checkNullSection(chunkX, y, chunkZ, true);
-+        }
-+
-+        super.checkChunkEdges(lightAccess, chunk, fromSection, toSection);
-+    }
-+
-+    @Override
-+    protected void checkChunkEdges(final LightChunkGetter lightAccess, final ChunkAccess chunk, final ShortCollection sections) {
-+        Arrays.fill(this.nullPropagationCheckCache, false);
-+        this.rewriteNibbleCacheForSkylight(chunk);
-+        final int chunkX = chunk.getPos().x;
-+        final int chunkZ = chunk.getPos().z;
-+        for (final ShortIterator iterator = sections.iterator(); iterator.hasNext();) {
-+            final int y = (int)iterator.nextShort();
-+            this.checkNullSection(chunkX, y, chunkZ, true);
-+        }
-+
-+        super.checkChunkEdges(lightAccess, chunk, sections);
-+    }
-+
-+    @Override
-+    protected void checkBlock(final LightChunkGetter lightAccess, final int worldX, final int worldY, final int worldZ) {
-+        // blocks can change opacity
-+        // blocks can change direction of propagation
-+
-+        // same logic applies from BlockStarLightEngine#checkBlock
-+
-+        final int encodeOffset = this.coordinateOffset;
-+
-+        final int currentLevel = this.getLightLevel(worldX, worldY, worldZ);
-+
-+        if (currentLevel == 15) {
-+            // must re-propagate clobbered source
-+            this.appendToIncreaseQueue(
-+                    ((worldX + (worldZ << 6) + (worldY << (6 + 6)) + encodeOffset) & ((1L << (6 + 6 + 16)) - 1))
-+                            | (currentLevel & 0xFL) << (6 + 6 + 16)
-+                            | (((long)ALL_DIRECTIONS_BITSET) << (6 + 6 + 16 + 4))
-+                            | FLAG_HAS_SIDED_TRANSPARENT_BLOCKS // don't know if the block is conditionally transparent
-+            );
-+        } else {
-+            this.setLightLevel(worldX, worldY, worldZ, 0);
-+        }
-+
-+        this.appendToDecreaseQueue(
-+                ((worldX + (worldZ << 6) + (worldY << (6 + 6)) + encodeOffset) & ((1L << (6 + 6 + 16)) - 1))
-+                        | (currentLevel & 0xFL) << (6 + 6 + 16)
-+                        | (((long)ALL_DIRECTIONS_BITSET) << (6 + 6 + 16 + 4))
-+        );
-+    }
-+
-+    protected final BlockPos.MutableBlockPos recalcCenterPos = new BlockPos.MutableBlockPos();
-+    protected final BlockPos.MutableBlockPos recalcNeighbourPos = new BlockPos.MutableBlockPos();
-+
-+    @Override
-+    protected int calculateLightValue(final LightChunkGetter lightAccess, final int worldX, final int worldY, final int worldZ,
-+                                      final int expect) {
-+        if (expect == 15) {
-+            return expect;
-+        }
-+
-+        final int sectionOffset = this.chunkSectionIndexOffset;
-+        final BlockState centerState = this.getBlockState(worldX, worldY, worldZ);
-+        int opacity = centerState.getOpacityIfCached();
-+
-+        final BlockState conditionallyOpaqueState;
-+        if (opacity < 0) {
-+            this.recalcCenterPos.set(worldX, worldY, worldZ);
-+            opacity = Math.max(1, centerState.getLightBlock(lightAccess.getLevel(), this.recalcCenterPos));
-+            if (centerState.isConditionallyFullOpaque()) {
-+                conditionallyOpaqueState = centerState;
-+            } else {
-+                conditionallyOpaqueState = null;
-+            }
-+        } else {
-+            conditionallyOpaqueState = null;
-+            opacity = Math.max(1, opacity);
-+        }
-+
-+        int level = 0;
-+
-+        for (final AxisDirection direction : AXIS_DIRECTIONS) {
-+            final int offX = worldX + direction.x;
-+            final int offY = worldY + direction.y;
-+            final int offZ = worldZ + direction.z;
-+
-+            final int sectionIndex = (offX >> 4) + 5 * (offZ >> 4) + (5 * 5) * (offY >> 4) + sectionOffset;
-+
-+            final int neighbourLevel = this.getLightLevel(sectionIndex, (offX & 15) | ((offZ & 15) << 4) | ((offY & 15) << 8));
-+
-+            if ((neighbourLevel - 1) <= level) {
-+                // don't need to test transparency, we know it wont affect the result.
-+                continue;
-+            }
-+
-+            final BlockState neighbourState = this.getBlockState(offX, offY, offZ);
-+
-+            if (neighbourState.isConditionallyFullOpaque()) {
-+                // here the block can be conditionally opaque (i.e light cannot propagate from it), so we need to test that
-+                // we don't read the blockstate because most of the time this is false, so using the faster
-+                // known transparency lookup results in a net win
-+                this.recalcNeighbourPos.set(offX, offY, offZ);
-+                final VoxelShape neighbourFace = neighbourState.getFaceOcclusionShape(lightAccess.getLevel(), this.recalcNeighbourPos, direction.opposite.nms);
-+                final VoxelShape thisFace = conditionallyOpaqueState == null ? Shapes.empty() : conditionallyOpaqueState.getFaceOcclusionShape(lightAccess.getLevel(), this.recalcCenterPos, direction.nms);
-+                if (Shapes.faceShapeOccludes(thisFace, neighbourFace)) {
-+                    // not allowed to propagate
-+                    continue;
-+                }
-+            }
-+
-+            final int calculated = neighbourLevel - opacity;
-+            level = Math.max(calculated, level);
-+            if (level > expect) {
-+                return level;
-+            }
-+        }
-+
-+        return level;
-+    }
-+
-+    @Override
-+    protected void propagateBlockChanges(final LightChunkGetter lightAccess, final ChunkAccess atChunk, final Set<BlockPos> positions) {
-+        this.rewriteNibbleCacheForSkylight(atChunk);
-+        Arrays.fill(this.nullPropagationCheckCache, false);
-+
-+        final BlockGetter world = lightAccess.getLevel();
-+        final int chunkX = atChunk.getPos().x;
-+        final int chunkZ = atChunk.getPos().z;
-+        final int heightMapOffset = chunkX * -16 + (chunkZ * (-16 * 16));
-+
-+        // setup heightmap for changes
-+        for (final BlockPos pos : positions) {
-+            final int index = pos.getX() + (pos.getZ() << 4) + heightMapOffset;
-+            final int curr = this.heightMapBlockChange[index];
-+            if (pos.getY() > curr) {
-+                this.heightMapBlockChange[index] = pos.getY();
-+            }
-+        }
-+
-+        // note: light sets are delayed while processing skylight source changes due to how
-+        // nibbles are initialised, as we want to avoid clobbering nibble values so what when
-+        // below nibbles are initialised they aren't reading from partially modified nibbles
-+
-+        // now we can recalculate the sources for the changed columns
-+        for (int index = 0; index < (16 * 16); ++index) {
-+            final int maxY = this.heightMapBlockChange[index];
-+            if (maxY == Integer.MIN_VALUE) {
-+                // not changed
-+                continue;
-+            }
-+            this.heightMapBlockChange[index] = Integer.MIN_VALUE; // restore default for next caller
-+
-+            final int columnX = (index & 15) | (chunkX << 4);
-+            final int columnZ = (index >>> 4) | (chunkZ << 4);
-+
-+            // try and propagate from the above y
-+            // delay light set until after processing all sources to setup
-+            final int maxPropagationY = this.tryPropagateSkylight(world, columnX, maxY, columnZ, true, true);
-+
-+            // maxPropagationY is now the highest block that could not be propagated to
-+
-+            // remove all sources below that are 15
-+            final long propagateDirection = AxisDirection.POSITIVE_Y.everythingButThisDirection;
-+            final int encodeOffset = this.coordinateOffset;
-+
-+            if (this.getLightLevelExtruded(columnX, maxPropagationY, columnZ) == 15) {
-+                // ensure section is checked
-+                this.checkNullSection(columnX >> 4, maxPropagationY >> 4, columnZ >> 4, true);
-+
-+                for (int currY = maxPropagationY; currY >= (this.minLightSection << 4); --currY) {
-+                    if ((currY & 15) == 15) {
-+                        // ensure section is checked
-+                        this.checkNullSection(columnX >> 4, (currY >> 4), columnZ >> 4, true);
-+                    }
-+
-+                    // ensure section below is always checked
-+                    final SWMRNibbleArray nibble = this.getNibbleFromCache(columnX >> 4, currY >> 4, columnZ >> 4);
-+                    if (nibble == null) {
-+                        // advance currY to the the top of the section below
-+                        currY = (currY) & (~15);
-+                        // note: this value ^ is actually 1 above the top, but the loop decrements by 1 so we actually
-+                        // end up there
-+                        continue;
-+                    }
-+
-+                    if (nibble.getUpdating(columnX, currY, columnZ) != 15) {
-+                        break;
-+                    }
-+
-+                    // delay light set until after processing all sources to setup
-+                    this.appendToDecreaseQueue(
-+                            ((columnX + (columnZ << 6) + (currY << (6 + 6)) + encodeOffset) & ((1L << (6 + 6 + 16)) - 1))
-+                                    | (15L << (6 + 6 + 16))
-+                                    | (propagateDirection << (6 + 6 + 16 + 4))
-+                                    // do not set transparent blocks for the same reason we don't in the checkBlock method
-+                    );
-+                }
-+            }
-+        }
-+
-+        // delayed light sets are processed here, and must be processed before checkBlock as checkBlock reads
-+        // immediate light value
-+        this.processDelayedIncreases();
-+        this.processDelayedDecreases();
-+
-+        for (final BlockPos pos : positions) {
-+            this.checkBlock(lightAccess, pos.getX(), pos.getY(), pos.getZ());
-+        }
-+
-+        this.performLightDecrease(lightAccess);
-+    }
-+
-+    protected final int[] heightMapGen = new int[32 * 32];
-+
-+    @Override
-+    protected void lightChunk(final LightChunkGetter lightAccess, final ChunkAccess chunk, final boolean needsEdgeChecks) {
-+        this.rewriteNibbleCacheForSkylight(chunk);
-+        Arrays.fill(this.nullPropagationCheckCache, false);
-+
-+        final BlockGetter world = lightAccess.getLevel();
-+        final ChunkPos chunkPos = chunk.getPos();
-+        final int chunkX = chunkPos.x;
-+        final int chunkZ = chunkPos.z;
-+
-+        final LevelChunkSection[] sections = chunk.getSections();
-+
-+        int highestNonEmptySection = this.maxSection;
-+        while (highestNonEmptySection == (this.minSection - 1) ||
-+                sections[highestNonEmptySection - this.minSection] == null || sections[highestNonEmptySection - this.minSection].hasOnlyAir()) {
-+            this.checkNullSection(chunkX, highestNonEmptySection, chunkZ, false);
-+            // try propagate FULL to neighbours
-+
-+            // check neighbours to see if we need to propagate into them
-+            for (final AxisDirection direction : ONLY_HORIZONTAL_DIRECTIONS) {
-+                final int neighbourX = chunkX + direction.x;
-+                final int neighbourZ = chunkZ + direction.z;
-+                final SWMRNibbleArray neighbourNibble = this.getNibbleFromCache(neighbourX, highestNonEmptySection, neighbourZ);
-+                if (neighbourNibble == null) {
-+                    // unloaded neighbour
-+                    // most of the time we fall here
-+                    continue;
-+                }
-+
-+                // it looks like we need to propagate into the neighbour
-+
-+                final int incX;
-+                final int incZ;
-+                final int startX;
-+                final int startZ;
-+
-+                if (direction.x != 0) {
-+                    // x direction
-+                    incX = 0;
-+                    incZ = 1;
-+
-+                    if (direction.x < 0) {
-+                        // negative
-+                        startX = chunkX << 4;
-+                    } else {
-+                        startX = chunkX << 4 | 15;
-+                    }
-+                    startZ = chunkZ << 4;
-+                } else {
-+                    // z direction
-+                    incX = 1;
-+                    incZ = 0;
-+
-+                    if (direction.z < 0) {
-+                        // negative
-+                        startZ = chunkZ << 4;
-+                    } else {
-+                        startZ = chunkZ << 4 | 15;
-+                    }
-+                    startX = chunkX << 4;
-+                }
-+
-+                final int encodeOffset = this.coordinateOffset;
-+                final long propagateDirection = 1L << direction.ordinal(); // we only want to check in this direction
-+
-+                for (int currY = highestNonEmptySection << 4, maxY = currY | 15; currY <= maxY; ++currY) {
-+                    for (int i = 0, currX = startX, currZ = startZ; i < 16; ++i, currX += incX, currZ += incZ) {
-+                        this.appendToIncreaseQueue(
-+                                ((currX + (currZ << 6) + (currY << (6 + 6)) + encodeOffset) & ((1L << (6 + 6 + 16)) - 1))
-+                                        | (15L << (6 + 6 + 16)) // we know we're at full lit here
-+                                        | (propagateDirection << (6 + 6 + 16 + 4))
-+                                        // no transparent flag, we know for a fact there are no blocks here that could be directionally transparent (as the section is EMPTY)
-+                        );
-+                    }
-+                }
-+            }
-+
-+            if (highestNonEmptySection-- == (this.minSection - 1)) {
-+                break;
-+            }
-+        }
-+
-+        if (highestNonEmptySection >= this.minSection) {
-+            // fill out our other sources
-+            final int minX = chunkPos.x << 4;
-+            final int maxX = chunkPos.x << 4 | 15;
-+            final int minZ = chunkPos.z << 4;
-+            final int maxZ = chunkPos.z << 4 | 15;
-+            final int startY = highestNonEmptySection << 4 | 15;
-+            for (int currZ = minZ; currZ <= maxZ; ++currZ) {
-+                for (int currX = minX; currX <= maxX; ++currX) {
-+                    this.tryPropagateSkylight(world, currX, startY + 1, currZ, false, false);
-+                }
-+            }
-+        } // else: apparently the chunk is empty
-+
-+        if (needsEdgeChecks) {
-+            // not required to propagate here, but this will reduce the hit of the edge checks
-+            this.performLightIncrease(lightAccess);
-+
-+            for (int y = highestNonEmptySection; y >= this.minLightSection; --y) {
-+                this.checkNullSection(chunkX, y, chunkZ, false);
-+            }
-+            // no need to rewrite the nibble cache again
-+            super.checkChunkEdges(lightAccess, chunk, this.minLightSection, highestNonEmptySection);
-+        } else {
-+            for (int y = highestNonEmptySection; y >= this.minLightSection; --y) {
-+                this.checkNullSection(chunkX, y, chunkZ, false);
-+            }
-+            this.propagateNeighbourLevels(lightAccess, chunk, this.minLightSection, highestNonEmptySection);
-+
-+            this.performLightIncrease(lightAccess);
-+        }
-+    }
-+
-+    protected final void processDelayedIncreases() {
-+        // copied from performLightIncrease
-+        final long[] queue = this.increaseQueue;
-+        final int decodeOffsetX = -this.encodeOffsetX;
-+        final int decodeOffsetY = -this.encodeOffsetY;
-+        final int decodeOffsetZ = -this.encodeOffsetZ;
-+
-+        for (int i = 0, len = this.increaseQueueInitialLength; i < len; ++i) {
-+            final long queueValue = queue[i];
-+
-+            final int posX = ((int)queueValue & 63) + decodeOffsetX;
-+            final int posZ = (((int)queueValue >>> 6) & 63) + decodeOffsetZ;
-+            final int posY = (((int)queueValue >>> 12) & ((1 << 16) - 1)) + decodeOffsetY;
-+            final int propagatedLightLevel = (int)((queueValue >>> (6 + 6 + 16)) & 0xF);
-+
-+            this.setLightLevel(posX, posY, posZ, propagatedLightLevel);
-+        }
-+    }
-+
-+    protected final void processDelayedDecreases() {
-+        // copied from performLightDecrease
-+        final long[] queue = this.decreaseQueue;
-+        final int decodeOffsetX = -this.encodeOffsetX;
-+        final int decodeOffsetY = -this.encodeOffsetY;
-+        final int decodeOffsetZ = -this.encodeOffsetZ;
-+
-+        for (int i = 0, len = this.decreaseQueueInitialLength; i < len; ++i) {
-+            final long queueValue = queue[i];
-+
-+            final int posX = ((int)queueValue & 63) + decodeOffsetX;
-+            final int posZ = (((int)queueValue >>> 6) & 63) + decodeOffsetZ;
-+            final int posY = (((int)queueValue >>> 12) & ((1 << 16) - 1)) + decodeOffsetY;
-+
-+            this.setLightLevel(posX, posY, posZ, 0);
-+        }
-+    }
-+
-+    // delaying the light set is useful for block changes since they need to worry about initialising nibblearrays
-+    // while also queueing light at the same time (initialising nibblearrays might depend on nibbles above, so
-+    // clobbering the light values will result in broken propagation)
-+    protected final int tryPropagateSkylight(final BlockGetter world, final int worldX, int startY, final int worldZ,
-+                                             final boolean extrudeInitialised, final boolean delayLightSet) {
-+        final BlockPos.MutableBlockPos mutablePos = this.mutablePos3;
-+        final int encodeOffset = this.coordinateOffset;
-+        final long propagateDirection = AxisDirection.POSITIVE_Y.everythingButThisDirection; // just don't check upwards.
-+
-+        if (this.getLightLevelExtruded(worldX, startY + 1, worldZ) != 15) {
-+            return startY;
-+        }
-+
-+        // ensure this section is always checked
-+        this.checkNullSection(worldX >> 4, startY >> 4, worldZ >> 4, extrudeInitialised);
-+
-+        BlockState above = this.getBlockState(worldX, startY + 1, worldZ);
-+
-+        for (;startY >= (this.minLightSection << 4); --startY) {
-+            if ((startY & 15) == 15) {
-+                // ensure this section is always checked
-+                this.checkNullSection(worldX >> 4, startY >> 4, worldZ >> 4, extrudeInitialised);
-+            }
-+            final BlockState current = this.getBlockState(worldX, startY, worldZ);
-+
-+            final VoxelShape fromShape;
-+            if (above.isConditionallyFullOpaque()) {
-+                this.mutablePos2.set(worldX, startY + 1, worldZ);
-+                fromShape = above.getFaceOcclusionShape(world, this.mutablePos2, AxisDirection.NEGATIVE_Y.nms);
-+                if (Shapes.faceShapeOccludes(Shapes.empty(), fromShape)) {
-+                    // above wont let us propagate
-+                    break;
-+                }
-+            } else {
-+                fromShape = Shapes.empty();
-+            }
-+
-+            final int opacityIfCached = current.getOpacityIfCached();
-+            // does light propagate from the top down?
-+            if (opacityIfCached != -1) {
-+                if (opacityIfCached != 0) {
-+                    // we cannot propagate 15 through this
-+                    break;
-+                }
-+                // most of the time it falls here.
-+                // add to propagate
-+                // light set delayed until we determine if this nibble section is null
-+                this.appendToIncreaseQueue(
-+                        ((worldX + (worldZ << 6) + (startY << (6 + 6)) + encodeOffset) & ((1L << (6 + 6 + 16)) - 1))
-+                                | (15L << (6 + 6 + 16)) // we know we're at full lit here
-+                                | (propagateDirection << (6 + 6 + 16 + 4))
-+                );
-+            } else {
-+                mutablePos.set(worldX, startY, worldZ);
-+                long flags = 0L;
-+                if (current.isConditionallyFullOpaque()) {
-+                    final VoxelShape cullingFace = current.getFaceOcclusionShape(world, mutablePos, AxisDirection.POSITIVE_Y.nms);
-+
-+                    if (Shapes.faceShapeOccludes(fromShape, cullingFace)) {
-+                        // can't propagate here, we're done on this column.
-+                        break;
-+                    }
-+                    flags |= FLAG_HAS_SIDED_TRANSPARENT_BLOCKS;
-+                }
-+
-+                final int opacity = current.getLightBlock(world, mutablePos);
-+                if (opacity > 0) {
-+                    // let the queued value (if any) handle it from here.
-+                    break;
-+                }
-+
-+                // light set delayed until we determine if this nibble section is null
-+                this.appendToIncreaseQueue(
-+                        ((worldX + (worldZ << 6) + (startY << (6 + 6)) + encodeOffset) & ((1L << (6 + 6 + 16)) - 1))
-+                                | (15L << (6 + 6 + 16)) // we know we're at full lit here
-+                                | (propagateDirection << (6 + 6 + 16 + 4))
-+                                | flags
-+                );
-+            }
-+
-+            above = current;
-+
-+            if (this.getNibbleFromCache(worldX >> 4, startY >> 4, worldZ >> 4) == null) {
-+                // we skip empty sections here, as this is just an easy way of making sure the above block
-+                // can propagate through air.
-+
-+                // nothing can propagate in null sections, remove the queue entry for it
-+                --this.increaseQueueInitialLength;
-+
-+                // advance currY to the the top of the section below
-+                startY = (startY) & (~15);
-+                // note: this value ^ is actually 1 above the top, but the loop decrements by 1 so we actually
-+                // end up there
-+
-+                // make sure this is marked as AIR
-+                above = AIR_BLOCK_STATE;
-+            } else if (!delayLightSet) {
-+                this.setLightLevel(worldX, startY, worldZ, 15);
-+            }
-+        }
-+
-+        return startY;
-+    }
-+}
-diff --git a/src/main/java/ca/spottedleaf/starlight/common/light/StarLightEngine.java b/src/main/java/ca/spottedleaf/starlight/common/light/StarLightEngine.java
-new file mode 100644
-index 0000000000000000000000000000000000000000..ad1eeebe6de219143492b94da309cb54ae9e0a5b
---- /dev/null
-+++ b/src/main/java/ca/spottedleaf/starlight/common/light/StarLightEngine.java
-@@ -0,0 +1,1572 @@
-+package ca.spottedleaf.starlight.common.light;
-+
-+import ca.spottedleaf.starlight.common.util.CoordinateUtils;
-+import ca.spottedleaf.starlight.common.util.IntegerUtil;
-+import ca.spottedleaf.starlight.common.util.WorldUtil;
-+import it.unimi.dsi.fastutil.longs.Long2ObjectOpenHashMap;
-+import it.unimi.dsi.fastutil.shorts.ShortCollection;
-+import it.unimi.dsi.fastutil.shorts.ShortIterator;
-+import net.minecraft.core.BlockPos;
-+import net.minecraft.core.Direction;
-+import net.minecraft.core.SectionPos;
-+import net.minecraft.world.level.BlockGetter;
-+import net.minecraft.world.level.ChunkPos;
-+import net.minecraft.world.level.Level;
-+import net.minecraft.world.level.LevelHeightAccessor;
-+import net.minecraft.world.level.LightLayer;
-+import net.minecraft.world.level.block.Blocks;
-+import net.minecraft.world.level.block.state.BlockState;
-+import net.minecraft.world.level.chunk.ChunkAccess;
-+import net.minecraft.world.level.chunk.LevelChunkSection;
-+import net.minecraft.world.level.chunk.LightChunkGetter;
-+import net.minecraft.world.phys.shapes.Shapes;
-+import net.minecraft.world.phys.shapes.VoxelShape;
-+import java.util.ArrayList;
-+import java.util.Arrays;
-+import java.util.List;
-+import java.util.Set;
-+import java.util.function.Consumer;
-+import java.util.function.IntConsumer;
-+
-+public abstract class StarLightEngine {
-+
-+    protected static final BlockState AIR_BLOCK_STATE = Blocks.AIR.defaultBlockState();
-+
-+    protected static final AxisDirection[] DIRECTIONS = AxisDirection.values();
-+    protected static final AxisDirection[] AXIS_DIRECTIONS = DIRECTIONS;
-+    protected static final AxisDirection[] ONLY_HORIZONTAL_DIRECTIONS = new AxisDirection[] {
-+            AxisDirection.POSITIVE_X, AxisDirection.NEGATIVE_X,
-+            AxisDirection.POSITIVE_Z, AxisDirection.NEGATIVE_Z
-+    };
-+
-+    protected static enum AxisDirection {
-+
-+        // Declaration order is important and relied upon. Do not change without modifying propagation code.
-+        POSITIVE_X(1, 0, 0), NEGATIVE_X(-1, 0, 0),
-+        POSITIVE_Z(0, 0, 1), NEGATIVE_Z(0, 0, -1),
-+        POSITIVE_Y(0, 1, 0), NEGATIVE_Y(0, -1, 0);
-+
-+        static {
-+            POSITIVE_X.opposite = NEGATIVE_X; NEGATIVE_X.opposite = POSITIVE_X;
-+            POSITIVE_Z.opposite = NEGATIVE_Z; NEGATIVE_Z.opposite = POSITIVE_Z;
-+            POSITIVE_Y.opposite = NEGATIVE_Y; NEGATIVE_Y.opposite = POSITIVE_Y;
-+        }
-+
-+        protected AxisDirection opposite;
-+
-+        public final int x;
-+        public final int y;
-+        public final int z;
-+        public final Direction nms;
-+        public final long everythingButThisDirection;
-+        public final long everythingButTheOppositeDirection;
-+
-+        AxisDirection(final int x, final int y, final int z) {
-+            this.x = x;
-+            this.y = y;
-+            this.z = z;
-+            this.nms = Direction.fromDelta(x, y, z);
-+            this.everythingButThisDirection = (long)(ALL_DIRECTIONS_BITSET ^ (1 << this.ordinal()));
-+            // positive is always even, negative is always odd. Flip the 1 bit to get the negative direction.
-+            this.everythingButTheOppositeDirection = (long)(ALL_DIRECTIONS_BITSET ^ (1 << (this.ordinal() ^ 1)));
-+        }
-+
-+        public AxisDirection getOpposite() {
-+            return this.opposite;
-+        }
-+    }
-+
-+    // I'd like to thank https://www.seedofandromeda.com/blogs/29-fast-flood-fill-lighting-in-a-blocky-voxel-game-pt-1
-+    // for explaining how light propagates via breadth-first search
-+
-+    // While the above is a good start to understanding the general idea of what the general principles are, it's not
-+    // exactly how the vanilla light engine should behave for minecraft.
-+
-+    // similar to the above, except the chunk section indices vary from [-1, 1], or [0, 2]
-+    // for the y chunk section it's from [minLightSection, maxLightSection] or [0, maxLightSection - minLightSection]
-+    // index = x + (z * 5) + (y * 25)
-+    // null index indicates the chunk section doesn't exist (empty or out of bounds)
-+    protected final LevelChunkSection[] sectionCache;
-+
-+    // the exact same as above, except for storing fast access to SWMRNibbleArray
-+    // for the y chunk section it's from [minLightSection, maxLightSection] or [0, maxLightSection - minLightSection]
-+    // index = x + (z * 5) + (y * 25)
-+    protected final SWMRNibbleArray[] nibbleCache;
-+
-+    // the exact same as above, except for storing fast access to nibbles to call change callbacks for
-+    // for the y chunk section it's from [minLightSection, maxLightSection] or [0, maxLightSection - minLightSection]
-+    // index = x + (z * 5) + (y * 25)
-+    protected final boolean[] notifyUpdateCache;
-+
-+    // always initialsed during start of lighting.
-+    // index = x + (z * 5)
-+    protected final ChunkAccess[] chunkCache = new ChunkAccess[5 * 5];
-+
-+    // index = x + (z * 5)
-+    protected final boolean[][] emptinessMapCache = new boolean[5 * 5][];
-+
-+    protected final BlockPos.MutableBlockPos mutablePos1 = new BlockPos.MutableBlockPos();
-+    protected final BlockPos.MutableBlockPos mutablePos2 = new BlockPos.MutableBlockPos();
-+    protected final BlockPos.MutableBlockPos mutablePos3 = new BlockPos.MutableBlockPos();
-+
-+    protected int encodeOffsetX;
-+    protected int encodeOffsetY;
-+    protected int encodeOffsetZ;
-+
-+    protected int coordinateOffset;
-+
-+    protected int chunkOffsetX;
-+    protected int chunkOffsetY;
-+    protected int chunkOffsetZ;
-+
-+    protected int chunkIndexOffset;
-+    protected int chunkSectionIndexOffset;
-+
-+    protected final boolean skylightPropagator;
-+    protected final int emittedLightMask;
-+    protected final boolean isClientSide;
-+
-+    protected final Level world;
-+    protected final int minLightSection;
-+    protected final int maxLightSection;
-+    protected final int minSection;
-+    protected final int maxSection;
-+
-+    protected StarLightEngine(final boolean skylightPropagator, final Level world) {
-+        this.skylightPropagator = skylightPropagator;
-+        this.emittedLightMask = skylightPropagator ? 0 : 0xF;
-+        this.isClientSide = world.isClientSide;
-+        this.world = world;
-+        this.minLightSection = WorldUtil.getMinLightSection(world);
-+        this.maxLightSection = WorldUtil.getMaxLightSection(world);
-+        this.minSection = WorldUtil.getMinSection(world);
-+        this.maxSection = WorldUtil.getMaxSection(world);
-+
-+        this.sectionCache = new LevelChunkSection[5 * 5 * ((this.maxLightSection - this.minLightSection + 1) + 2)]; // add two extra sections for buffer
-+        this.nibbleCache = new SWMRNibbleArray[5 * 5 * ((this.maxLightSection - this.minLightSection + 1) + 2)]; // add two extra sections for buffer
-+        this.notifyUpdateCache = new boolean[5 * 5 * ((this.maxLightSection - this.minLightSection + 1) + 2)]; // add two extra sections for buffer
-+    }
-+
-+    protected final void setupEncodeOffset(final int centerX, final int centerY, final int centerZ) {
-+        // 31 = center + encodeOffset
-+        this.encodeOffsetX = 31 - centerX;
-+        this.encodeOffsetY = (-(this.minLightSection - 1) << 4); // we want 0 to be the smallest encoded value
-+        this.encodeOffsetZ = 31 - centerZ;
-+
-+        // coordinateIndex = x | (z << 6) | (y << 12)
-+        this.coordinateOffset = this.encodeOffsetX + (this.encodeOffsetZ << 6) + (this.encodeOffsetY << 12);
-+
-+        // 2 = (centerX >> 4) + chunkOffset
-+        this.chunkOffsetX = 2 - (centerX >> 4);
-+        this.chunkOffsetY = -(this.minLightSection - 1); // lowest should be 0
-+        this.chunkOffsetZ = 2 - (centerZ >> 4);
-+
-+        // chunk index = x + (5 * z)
-+        this.chunkIndexOffset = this.chunkOffsetX + (5 * this.chunkOffsetZ);
-+
-+        // chunk section index = x + (5 * z) + ((5*5) * y)
-+        this.chunkSectionIndexOffset = this.chunkIndexOffset + ((5 * 5) * this.chunkOffsetY);
-+    }
-+
-+    protected final void setupCaches(final LightChunkGetter chunkProvider, final int centerX, final int centerY, final int centerZ,
-+                                     final boolean relaxed, final boolean tryToLoadChunksFor2Radius) {
-+        final int centerChunkX = centerX >> 4;
-+        final int centerChunkY = centerY >> 4;
-+        final int centerChunkZ = centerZ >> 4;
-+
-+        this.setupEncodeOffset(centerChunkX * 16 + 7, centerChunkY * 16 + 7, centerChunkZ * 16 + 7);
-+
-+        final int radius = tryToLoadChunksFor2Radius ? 2 : 1;
-+
-+        for (int dz = -radius; dz <= radius; ++dz) {
-+            for (int dx = -radius; dx <= radius; ++dx) {
-+                final int cx = centerChunkX + dx;
-+                final int cz = centerChunkZ + dz;
-+                final boolean isTwoRadius = Math.max(IntegerUtil.branchlessAbs(dx), IntegerUtil.branchlessAbs(dz)) == 2;
-+                final ChunkAccess chunk = (ChunkAccess)chunkProvider.getChunkForLighting(cx, cz);
-+
-+                if (chunk == null) {
-+                    if (relaxed | isTwoRadius) {
-+                        continue;
-+                    }
-+                    throw new IllegalArgumentException("Trying to propagate light update before 1 radius neighbours ready");
-+                }
-+
-+                if (!this.canUseChunk(chunk)) {
-+                    continue;
-+                }
-+
-+                this.setChunkInCache(cx, cz, chunk);
-+                this.setEmptinessMapCache(cx, cz, this.getEmptinessMap(chunk));
-+                if (!isTwoRadius) {
-+                    this.setBlocksForChunkInCache(cx, cz, chunk.getSections());
-+                    this.setNibblesForChunkInCache(cx, cz, this.getNibblesOnChunk(chunk));
-+                }
-+            }
-+        }
-+    }
-+
-+    protected final ChunkAccess getChunkInCache(final int chunkX, final int chunkZ) {
-+        return this.chunkCache[chunkX + 5*chunkZ + this.chunkIndexOffset];
-+    }
-+
-+    protected final void setChunkInCache(final int chunkX, final int chunkZ, final ChunkAccess chunk) {
-+        this.chunkCache[chunkX + 5*chunkZ + this.chunkIndexOffset] = chunk;
-+    }
-+
-+    protected final LevelChunkSection getChunkSection(final int chunkX, final int chunkY, final int chunkZ) {
-+        return this.sectionCache[chunkX + 5*chunkZ + (5 * 5) * chunkY + this.chunkSectionIndexOffset];
-+    }
-+
-+    protected final void setChunkSectionInCache(final int chunkX, final int chunkY, final int chunkZ, final LevelChunkSection section) {
-+        this.sectionCache[chunkX + 5*chunkZ + 5*5*chunkY + this.chunkSectionIndexOffset] = section;
-+    }
-+
-+    protected final void setBlocksForChunkInCache(final int chunkX, final int chunkZ, final LevelChunkSection[] sections) {
-+        for (int cy = this.minLightSection; cy <= this.maxLightSection; ++cy) {
-+            this.setChunkSectionInCache(chunkX, cy, chunkZ,
-+                    sections == null ? null : (cy >= this.minSection && cy <= this.maxSection ? sections[cy - this.minSection] : null));
-+        }
-+    }
-+
-+    protected final SWMRNibbleArray getNibbleFromCache(final int chunkX, final int chunkY, final int chunkZ) {
-+        return this.nibbleCache[chunkX + 5*chunkZ + (5 * 5) * chunkY + this.chunkSectionIndexOffset];
-+    }
-+
-+    protected final SWMRNibbleArray[] getNibblesForChunkFromCache(final int chunkX, final int chunkZ) {
-+        final SWMRNibbleArray[] ret = new SWMRNibbleArray[this.maxLightSection - this.minLightSection + 1];
-+
-+        for (int cy = this.minLightSection; cy <= this.maxLightSection; ++cy) {
-+            ret[cy - this.minLightSection] = this.nibbleCache[chunkX + 5*chunkZ + (cy * (5 * 5)) + this.chunkSectionIndexOffset];
-+        }
-+
-+        return ret;
-+    }
-+
-+    protected final void setNibbleInCache(final int chunkX, final int chunkY, final int chunkZ, final SWMRNibbleArray nibble) {
-+        this.nibbleCache[chunkX + 5*chunkZ + (5 * 5) * chunkY + this.chunkSectionIndexOffset] = nibble;
-+    }
-+
-+    protected final void setNibblesForChunkInCache(final int chunkX, final int chunkZ, final SWMRNibbleArray[] nibbles) {
-+        for (int cy = this.minLightSection; cy <= this.maxLightSection; ++cy) {
-+            this.setNibbleInCache(chunkX, cy, chunkZ, nibbles == null ? null : nibbles[cy - this.minLightSection]);
-+        }
-+    }
-+
-+    protected final void updateVisible(final LightChunkGetter lightAccess) {
-+        for (int index = 0, max = this.nibbleCache.length; index < max; ++index) {
-+            final SWMRNibbleArray nibble = this.nibbleCache[index];
-+            if (!this.notifyUpdateCache[index] && (nibble == null || !nibble.isDirty())) {
-+                continue;
-+            }
-+
-+            final int chunkX = (index % 5) - this.chunkOffsetX;
-+            final int chunkZ = ((index / 5) % 5) - this.chunkOffsetZ;
-+            final int ySections = (this.maxSection - this.minSection) + 1;
-+            final int chunkY = ((index / (5*5)) % (ySections + 2 + 2)) - this.chunkOffsetY;
-+            if ((nibble != null && nibble.updateVisible()) || this.notifyUpdateCache[index]) {
-+                lightAccess.onLightUpdate(this.skylightPropagator ? LightLayer.SKY : LightLayer.BLOCK, SectionPos.of(chunkX, chunkY, chunkZ));
-+            }
-+        }
-+    }
-+
-+    protected final void destroyCaches() {
-+        Arrays.fill(this.sectionCache, null);
-+        Arrays.fill(this.nibbleCache, null);
-+        Arrays.fill(this.chunkCache, null);
-+        Arrays.fill(this.emptinessMapCache, null);
-+        if (this.isClientSide) {
-+            Arrays.fill(this.notifyUpdateCache, false);
-+        }
-+    }
-+
-+    protected final BlockState getBlockState(final int worldX, final int worldY, final int worldZ) {
-+        final LevelChunkSection section = this.sectionCache[(worldX >> 4) + 5 * (worldZ >> 4) + (5 * 5) * (worldY >> 4) + this.chunkSectionIndexOffset];
-+
-+        if (section != null) {
-+            return section.hasOnlyAir() ? AIR_BLOCK_STATE : section.getBlockState(worldX & 15, worldY & 15, worldZ & 15);
-+        }
-+
-+        return AIR_BLOCK_STATE;
-+    }
-+
-+    protected final BlockState getBlockState(final int sectionIndex, final int localIndex) {
-+        final LevelChunkSection section = this.sectionCache[sectionIndex];
-+
-+        if (section != null) {
-+            return section.hasOnlyAir() ? AIR_BLOCK_STATE : section.states.get(localIndex);
-+        }
-+
-+        return AIR_BLOCK_STATE;
-+    }
-+
-+    protected final int getLightLevel(final int worldX, final int worldY, final int worldZ) {
-+        final SWMRNibbleArray nibble = this.nibbleCache[(worldX >> 4) + 5 * (worldZ >> 4) + (5 * 5) * (worldY >> 4) + this.chunkSectionIndexOffset];
-+
-+        return nibble == null ? 0 : nibble.getUpdating((worldX & 15) | ((worldZ & 15) << 4) | ((worldY & 15) << 8));
-+    }
-+
-+    protected final int getLightLevel(final int sectionIndex, final int localIndex) {
-+        final SWMRNibbleArray nibble = this.nibbleCache[sectionIndex];
-+
-+        return nibble == null ? 0 : nibble.getUpdating(localIndex);
-+    }
-+
-+    protected final void setLightLevel(final int worldX, final int worldY, final int worldZ, final int level) {
-+        final int sectionIndex = (worldX >> 4) + 5 * (worldZ >> 4) + (5 * 5) * (worldY >> 4) + this.chunkSectionIndexOffset;
-+        final SWMRNibbleArray nibble = this.nibbleCache[sectionIndex];
-+
-+        if (nibble != null) {
-+            nibble.set((worldX & 15) | ((worldZ & 15) << 4) | ((worldY & 15) << 8), level);
-+            if (this.isClientSide) {
-+                int cx1 = (worldX - 1) >> 4;
-+                int cx2 = (worldX + 1) >> 4;
-+                int cy1 = (worldY - 1) >> 4;
-+                int cy2 = (worldY + 1) >> 4;
-+                int cz1 = (worldZ - 1) >> 4;
-+                int cz2 = (worldZ + 1) >> 4;
-+                for (int x = cx1; x <= cx2; ++x) {
-+                    for (int y = cy1; y <= cy2; ++y) {
-+                        for (int z = cz1; z <= cz2; ++z) {
-+                            this.notifyUpdateCache[x + 5 * z + (5 * 5) * y + this.chunkSectionIndexOffset] = true;
-+                        }
-+                    }
-+                }
-+            }
-+        }
-+    }
-+
-+    protected final void postLightUpdate(final int worldX, final int worldY, final int worldZ) {
-+        if (this.isClientSide) {
-+            int cx1 = (worldX - 1) >> 4;
-+            int cx2 = (worldX + 1) >> 4;
-+            int cy1 = (worldY - 1) >> 4;
-+            int cy2 = (worldY + 1) >> 4;
-+            int cz1 = (worldZ - 1) >> 4;
-+            int cz2 = (worldZ + 1) >> 4;
-+            for (int x = cx1; x <= cx2; ++x) {
-+                for (int y = cy1; y <= cy2; ++y) {
-+                    for (int z = cz1; z <= cz2; ++z) {
-+                        this.notifyUpdateCache[x + (5 * z) + (5 * 5 * y) + this.chunkSectionIndexOffset] = true;
-+                    }
-+                }
-+            }
-+        }
-+    }
-+
-+    protected final void setLightLevel(final int sectionIndex, final int localIndex, final int worldX, final int worldY, final int worldZ, final int level) {
-+        final SWMRNibbleArray nibble = this.nibbleCache[sectionIndex];
-+
-+        if (nibble != null) {
-+            nibble.set(localIndex, level);
-+            if (this.isClientSide) {
-+                int cx1 = (worldX - 1) >> 4;
-+                int cx2 = (worldX + 1) >> 4;
-+                int cy1 = (worldY - 1) >> 4;
-+                int cy2 = (worldY + 1) >> 4;
-+                int cz1 = (worldZ - 1) >> 4;
-+                int cz2 = (worldZ + 1) >> 4;
-+                for (int x = cx1; x <= cx2; ++x) {
-+                    for (int y = cy1; y <= cy2; ++y) {
-+                        for (int z = cz1; z <= cz2; ++z) {
-+                            this.notifyUpdateCache[x + (5 * z) + (5 * 5 * y) + this.chunkSectionIndexOffset] = true;
-+                        }
-+                    }
-+                }
-+            }
-+        }
-+    }
-+
-+    protected final boolean[] getEmptinessMap(final int chunkX, final int chunkZ) {
-+        return this.emptinessMapCache[chunkX + 5*chunkZ + this.chunkIndexOffset];
-+    }
-+
-+    protected final void setEmptinessMapCache(final int chunkX, final int chunkZ, final boolean[] emptinessMap) {
-+        this.emptinessMapCache[chunkX + 5*chunkZ + this.chunkIndexOffset] = emptinessMap;
-+    }
-+
-+    public static SWMRNibbleArray[] getFilledEmptyLight(final LevelHeightAccessor world) {
-+        return getFilledEmptyLight(WorldUtil.getTotalLightSections(world));
-+    }
-+
-+    private static SWMRNibbleArray[] getFilledEmptyLight(final int totalLightSections) {
-+        final SWMRNibbleArray[] ret = new SWMRNibbleArray[totalLightSections];
-+
-+        for (int i = 0, len = ret.length; i < len; ++i) {
-+            ret[i] = new SWMRNibbleArray(null, true);
-+        }
-+
-+        return ret;
-+    }
-+
-+    protected abstract boolean[] getEmptinessMap(final ChunkAccess chunk);
-+
-+    protected abstract void setEmptinessMap(final ChunkAccess chunk, final boolean[] to);
-+
-+    protected abstract SWMRNibbleArray[] getNibblesOnChunk(final ChunkAccess chunk);
-+
-+    protected abstract void setNibbles(final ChunkAccess chunk, final SWMRNibbleArray[] to);
-+
-+    protected abstract boolean canUseChunk(final ChunkAccess chunk);
-+
-+    public final void blocksChangedInChunk(final LightChunkGetter lightAccess, final int chunkX, final int chunkZ,
-+                                           final Set<BlockPos> positions, final Boolean[] changedSections) {
-+        this.setupCaches(lightAccess, chunkX * 16 + 7, 128, chunkZ * 16 + 7, true, true);
-+        try {
-+            final ChunkAccess chunk = this.getChunkInCache(chunkX, chunkZ);
-+            if (chunk == null) {
-+                return;
-+            }
-+            if (changedSections != null) {
-+                final boolean[] ret = this.handleEmptySectionChanges(lightAccess, chunk, changedSections, false);
-+                if (ret != null) {
-+                    this.setEmptinessMap(chunk, ret);
-+                }
-+            }
-+            if (!positions.isEmpty()) {
-+                this.propagateBlockChanges(lightAccess, chunk, positions);
-+            }
-+            this.updateVisible(lightAccess);
-+        } finally {
-+            this.destroyCaches();
-+        }
-+    }
-+
-+    // subclasses should not initialise caches, as this will always be done by the super call
-+    // subclasses should not invoke updateVisible, as this will always be done by the super call
-+    protected abstract void propagateBlockChanges(final LightChunkGetter lightAccess, final ChunkAccess atChunk, final Set<BlockPos> positions);
-+
-+    protected abstract void checkBlock(final LightChunkGetter lightAccess, final int worldX, final int worldY, final int worldZ);
-+
-+    // if ret > expect, then the real value is at least ret (early returns if ret > expect, rather than calculating actual)
-+    // if ret == expect, then expect is the correct light value for pos
-+    // if ret < expect, then ret is the real light value
-+    protected abstract int calculateLightValue(final LightChunkGetter lightAccess, final int worldX, final int worldY, final int worldZ,
-+                                               final int expect);
-+
-+    protected final int[] chunkCheckDelayedUpdatesCenter = new int[16 * 16];
-+    protected final int[] chunkCheckDelayedUpdatesNeighbour = new int[16 * 16];
-+
-+    protected void checkChunkEdge(final LightChunkGetter lightAccess, final ChunkAccess chunk,
-+                                  final int chunkX, final int chunkY, final int chunkZ) {
-+        final SWMRNibbleArray currNibble = this.getNibbleFromCache(chunkX, chunkY, chunkZ);
-+        if (currNibble == null) {
-+            return;
-+        }
-+
-+        for (final AxisDirection direction : ONLY_HORIZONTAL_DIRECTIONS) {
-+            final int neighbourOffX = direction.x;
-+            final int neighbourOffZ = direction.z;
-+
-+            final SWMRNibbleArray neighbourNibble = this.getNibbleFromCache(chunkX + neighbourOffX,
-+                    chunkY, chunkZ + neighbourOffZ);
-+
-+            if (neighbourNibble == null) {
-+                continue;
-+            }
-+
-+            if (!currNibble.isInitialisedUpdating() && !neighbourNibble.isInitialisedUpdating()) {
-+                // both are zero, nothing to check.
-+                continue;
-+            }
-+
-+            // this chunk
-+            final int incX;
-+            final int incZ;
-+            final int startX;
-+            final int startZ;
-+
-+            if (neighbourOffX != 0) {
-+                // x direction
-+                incX = 0;
-+                incZ = 1;
-+
-+                if (direction.x < 0) {
-+                    // negative
-+                    startX = chunkX << 4;
-+                } else {
-+                    startX = chunkX << 4 | 15;
-+                }
-+                startZ = chunkZ << 4;
-+            } else {
-+                // z direction
-+                incX = 1;
-+                incZ = 0;
-+
-+                if (neighbourOffZ < 0) {
-+                    // negative
-+                    startZ = chunkZ << 4;
-+                } else {
-+                    startZ = chunkZ << 4 | 15;
-+                }
-+                startX = chunkX << 4;
-+            }
-+
-+            int centerDelayedChecks = 0;
-+            int neighbourDelayedChecks = 0;
-+            for (int currY = chunkY << 4, maxY = currY | 15; currY <= maxY; ++currY) {
-+                for (int i = 0, currX = startX, currZ = startZ; i < 16; ++i, currX += incX, currZ += incZ) {
-+                    final int neighbourX = currX + neighbourOffX;
-+                    final int neighbourZ = currZ + neighbourOffZ;
-+
-+                    final int currentIndex = (currX & 15) |
-+                            ((currZ & 15)) << 4 |
-+                            ((currY & 15) << 8);
-+                    final int currentLevel = currNibble.getUpdating(currentIndex);
-+
-+                    final int neighbourIndex =
-+                            (neighbourX & 15) |
-+                            ((neighbourZ & 15)) << 4 |
-+                            ((currY & 15) << 8);
-+                    final int neighbourLevel = neighbourNibble.getUpdating(neighbourIndex);
-+
-+                    // the checks are delayed because the checkBlock method clobbers light values - which then
-+                    // affect later calculate light value operations. While they don't affect it in a behaviourly significant
-+                    // way, they do have a negative performance impact due to simply queueing more values
-+
-+                    if (this.calculateLightValue(lightAccess, currX, currY, currZ, currentLevel) != currentLevel) {
-+                        this.chunkCheckDelayedUpdatesCenter[centerDelayedChecks++] = currentIndex;
-+                    }
-+
-+                    if (this.calculateLightValue(lightAccess, neighbourX, currY, neighbourZ, neighbourLevel) != neighbourLevel) {
-+                        this.chunkCheckDelayedUpdatesNeighbour[neighbourDelayedChecks++] = neighbourIndex;
-+                    }
-+                }
-+            }
-+
-+            final int currentChunkOffX = chunkX << 4;
-+            final int currentChunkOffZ = chunkZ << 4;
-+            final int neighbourChunkOffX = (chunkX + direction.x) << 4;
-+            final int neighbourChunkOffZ = (chunkZ + direction.z) << 4;
-+            final int chunkOffY = chunkY << 4;
-+            for (int i = 0, len = Math.max(centerDelayedChecks, neighbourDelayedChecks); i < len; ++i) {
-+                // try to queue neighbouring data together
-+                // index = x | (z << 4) | (y << 8)
-+                if (i < centerDelayedChecks) {
-+                    final int value = this.chunkCheckDelayedUpdatesCenter[i];
-+                    this.checkBlock(lightAccess, currentChunkOffX | (value & 15),
-+                            chunkOffY | (value >>> 8),
-+                            currentChunkOffZ | ((value >>> 4) & 0xF));
-+                }
-+                if (i < neighbourDelayedChecks) {
-+                    final int value = this.chunkCheckDelayedUpdatesNeighbour[i];
-+                    this.checkBlock(lightAccess, neighbourChunkOffX | (value & 15),
-+                            chunkOffY | (value >>> 8),
-+                            neighbourChunkOffZ | ((value >>> 4) & 0xF));
-+                }
-+            }
-+        }
-+    }
-+
-+    protected void checkChunkEdges(final LightChunkGetter lightAccess, final ChunkAccess chunk, final ShortCollection sections) {
-+        final ChunkPos chunkPos = chunk.getPos();
-+        final int chunkX = chunkPos.x;
-+        final int chunkZ = chunkPos.z;
-+
-+        for (final ShortIterator iterator = sections.iterator(); iterator.hasNext();) {
-+            this.checkChunkEdge(lightAccess, chunk, chunkX, iterator.nextShort(), chunkZ);
-+        }
-+
-+        this.performLightDecrease(lightAccess);
-+    }
-+
-+    // subclasses should not initialise caches, as this will always be done by the super call
-+    // subclasses should not invoke updateVisible, as this will always be done by the super call
-+    // verifies that light levels on this chunks edges are consistent with this chunk's neighbours
-+    // edges. if they are not, they are decreased (effectively performing the logic in checkBlock).
-+    // This does not resolve skylight source problems.
-+    protected void checkChunkEdges(final LightChunkGetter lightAccess, final ChunkAccess chunk, final int fromSection, final int toSection) {
-+        final ChunkPos chunkPos = chunk.getPos();
-+        final int chunkX = chunkPos.x;
-+        final int chunkZ = chunkPos.z;
-+
-+        for (int currSectionY = toSection; currSectionY >= fromSection; --currSectionY) {
-+            this.checkChunkEdge(lightAccess, chunk, chunkX, currSectionY, chunkZ);
-+        }
-+
-+        this.performLightDecrease(lightAccess);
-+    }
-+
-+    // pulls light from neighbours, and adds them into the increase queue. does not actually propagate.
-+    protected final void propagateNeighbourLevels(final LightChunkGetter lightAccess, final ChunkAccess chunk, final int fromSection, final int toSection) {
-+        final ChunkPos chunkPos = chunk.getPos();
-+        final int chunkX = chunkPos.x;
-+        final int chunkZ = chunkPos.z;
-+
-+        for (int currSectionY = toSection; currSectionY >= fromSection; --currSectionY) {
-+            final SWMRNibbleArray currNibble = this.getNibbleFromCache(chunkX, currSectionY, chunkZ);
-+            if (currNibble == null) {
-+                continue;
-+            }
-+            for (final AxisDirection direction : ONLY_HORIZONTAL_DIRECTIONS) {
-+                final int neighbourOffX = direction.x;
-+                final int neighbourOffZ = direction.z;
-+
-+                final SWMRNibbleArray neighbourNibble = this.getNibbleFromCache(chunkX + neighbourOffX,
-+                        currSectionY, chunkZ + neighbourOffZ);
-+
-+                if (neighbourNibble == null || !neighbourNibble.isInitialisedUpdating()) {
-+                    // can't pull from 0
-+                    continue;
-+                }
-+
-+                // neighbour chunk
-+                final int incX;
-+                final int incZ;
-+                final int startX;
-+                final int startZ;
-+
-+                if (neighbourOffX != 0) {
-+                    // x direction
-+                    incX = 0;
-+                    incZ = 1;
-+
-+                    if (direction.x < 0) {
-+                        // negative
-+                        startX = (chunkX << 4) - 1;
-+                    } else {
-+                        startX = (chunkX << 4) + 16;
-+                    }
-+                    startZ = chunkZ << 4;
-+                } else {
-+                    // z direction
-+                    incX = 1;
-+                    incZ = 0;
-+
-+                    if (neighbourOffZ < 0) {
-+                        // negative
-+                        startZ = (chunkZ << 4) - 1;
-+                    } else {
-+                        startZ = (chunkZ << 4) + 16;
-+                    }
-+                    startX = chunkX << 4;
-+                }
-+
-+                final long propagateDirection = 1L << direction.getOpposite().ordinal(); // we only want to check in this direction towards this chunk
-+                final int encodeOffset = this.coordinateOffset;
-+
-+                for (int currY = currSectionY << 4, maxY = currY | 15; currY <= maxY; ++currY) {
-+                    for (int i = 0, currX = startX, currZ = startZ; i < 16; ++i, currX += incX, currZ += incZ) {
-+                        final int level = neighbourNibble.getUpdating(
-+                                (currX & 15)
-+                                        | ((currZ & 15) << 4)
-+                                        | ((currY & 15) << 8)
-+                        );
-+
-+                        if (level <= 1) {
-+                            // nothing to propagate
-+                            continue;
-+                        }
-+
-+                        this.appendToIncreaseQueue(
-+                                ((currX + (currZ << 6) + (currY << (6 + 6)) + encodeOffset) & ((1L << (6 + 6 + 16)) - 1))
-+                                        | ((level & 0xFL) << (6 + 6 + 16))
-+                                        | (propagateDirection << (6 + 6 + 16 + 4))
-+                                        | FLAG_HAS_SIDED_TRANSPARENT_BLOCKS // don't know if the current block is transparent, must check.
-+                        );
-+                    }
-+                }
-+            }
-+        }
-+    }
-+
-+    public static Boolean[] getEmptySectionsForChunk(final ChunkAccess chunk) {
-+        final LevelChunkSection[] sections = chunk.getSections();
-+        final Boolean[] ret = new Boolean[sections.length];
-+
-+        for (int i = 0; i < sections.length; ++i) {
-+            if (sections[i] == null || sections[i].hasOnlyAir()) {
-+                ret[i] = Boolean.TRUE;
-+            } else {
-+                ret[i] = Boolean.FALSE;
-+            }
-+        }
-+
-+        return ret;
-+    }
-+
-+    public final void forceHandleEmptySectionChanges(final LightChunkGetter lightAccess, final ChunkAccess chunk, final Boolean[] emptinessChanges) {
-+        final int chunkX = chunk.getPos().x;
-+        final int chunkZ = chunk.getPos().z;
-+        this.setupCaches(lightAccess, chunkX * 16 + 7, 128, chunkZ * 16 + 7, true, true);
-+        try {
-+            // force current chunk into cache
-+            this.setChunkInCache(chunkX, chunkZ, chunk);
-+            this.setBlocksForChunkInCache(chunkX, chunkZ, chunk.getSections());
-+            this.setNibblesForChunkInCache(chunkX, chunkZ, this.getNibblesOnChunk(chunk));
-+            this.setEmptinessMapCache(chunkX, chunkZ, this.getEmptinessMap(chunk));
-+
-+            final boolean[] ret = this.handleEmptySectionChanges(lightAccess, chunk, emptinessChanges, false);
-+            if (ret != null) {
-+                this.setEmptinessMap(chunk, ret);
-+            }
-+            this.updateVisible(lightAccess);
-+        } finally {
-+            this.destroyCaches();
-+        }
-+    }
-+
-+    public final void handleEmptySectionChanges(final LightChunkGetter lightAccess, final int chunkX, final int chunkZ,
-+                                                final Boolean[] emptinessChanges) {
-+        this.setupCaches(lightAccess, chunkX * 16 + 7, 128, chunkZ * 16 + 7, true, true);
-+        try {
-+            final ChunkAccess chunk = this.getChunkInCache(chunkX, chunkZ);
-+            if (chunk == null) {
-+                return;
-+            }
-+            final boolean[] ret = this.handleEmptySectionChanges(lightAccess, chunk, emptinessChanges, false);
-+            if (ret != null) {
-+                this.setEmptinessMap(chunk, ret);
-+            }
-+            this.updateVisible(lightAccess);
-+        } finally {
-+            this.destroyCaches();
-+        }
-+    }
-+
-+    protected abstract void initNibble(final int chunkX, final int chunkY, final int chunkZ, final boolean extrude, final boolean initRemovedNibbles);
-+
-+    protected abstract void setNibbleNull(final int chunkX, final int chunkY, final int chunkZ);
-+
-+    // subclasses should not initialise caches, as this will always be done by the super call
-+    // subclasses should not invoke updateVisible, as this will always be done by the super call
-+    // subclasses are guaranteed that this is always called before a changed block set
-+    // newChunk specifies whether the changes describe a "first load" of a chunk or changes to existing, already loaded chunks
-+    // rets non-null when the emptiness map changed and needs to be updated
-+    protected final boolean[] handleEmptySectionChanges(final LightChunkGetter lightAccess, final ChunkAccess chunk,
-+                                                        final Boolean[] emptinessChanges, final boolean unlit) {
-+        final Level world = (Level)lightAccess.getLevel();
-+        final int chunkX = chunk.getPos().x;
-+        final int chunkZ = chunk.getPos().z;
-+
-+        boolean[] chunkEmptinessMap = this.getEmptinessMap(chunkX, chunkZ);
-+        boolean[] ret = null;
-+        final boolean needsInit = unlit || chunkEmptinessMap == null;
-+        if (needsInit) {
-+            this.setEmptinessMapCache(chunkX, chunkZ, ret = chunkEmptinessMap = new boolean[WorldUtil.getTotalSections(world)]);
-+        }
-+
-+        // update emptiness map
-+        for (int sectionIndex = (emptinessChanges.length - 1); sectionIndex >= 0; --sectionIndex) {
-+            Boolean valueBoxed = emptinessChanges[sectionIndex];
-+            if (valueBoxed == null) {
-+                if (!needsInit) {
-+                    continue;
-+                }
-+                final LevelChunkSection section = this.getChunkSection(chunkX, sectionIndex + this.minSection, chunkZ);
-+                emptinessChanges[sectionIndex] = valueBoxed = section == null || section.hasOnlyAir() ? Boolean.TRUE : Boolean.FALSE;
-+            }
-+            chunkEmptinessMap[sectionIndex] = valueBoxed.booleanValue();
-+        }
-+
-+        // now init neighbour nibbles
-+        for (int sectionIndex = (emptinessChanges.length - 1); sectionIndex >= 0; --sectionIndex) {
-+            final Boolean valueBoxed = emptinessChanges[sectionIndex];
-+            final int sectionY = sectionIndex + this.minSection;
-+            if (valueBoxed == null) {
-+                continue;
-+            }
-+
-+            final boolean empty = valueBoxed.booleanValue();
-+
-+            if (empty) {
-+                continue;
-+            }
-+
-+            for (int dz = -1; dz <= 1; ++dz) {
-+                for (int dx = -1; dx <= 1; ++dx) {
-+                    // if we're not empty, we also need to initialise nibbles
-+                    // note: if we're unlit, we absolutely do not want to extrude, as light data isn't set up
-+                    final boolean extrude = (dx | dz) != 0 || !unlit;
-+                    for (int dy = 1; dy >= -1; --dy) {
-+                        this.initNibble(dx + chunkX, dy + sectionY, dz + chunkZ, extrude, false);
-+                    }
-+                }
-+            }
-+        }
-+
-+        // check for de-init and lazy-init
-+        // lazy init is when chunks are being lit, so at the time they weren't loaded when their neighbours were running
-+        // init checks.
-+        for (int dz = -1; dz <= 1; ++dz) {
-+            for (int dx = -1; dx <= 1; ++dx) {
-+                // does this neighbour have 1 radius loaded?
-+                boolean neighboursLoaded = true;
-+                neighbour_loaded_search:
-+                for (int dz2 = -1; dz2 <= 1; ++dz2) {
-+                    for (int dx2 = -1; dx2 <= 1; ++dx2) {
-+                        if (this.getEmptinessMap(dx + dx2 + chunkX, dz + dz2 + chunkZ) == null) {
-+                            neighboursLoaded = false;
-+                            break neighbour_loaded_search;
-+                        }
-+                    }
-+                }
-+
-+                for (int sectionY = this.maxLightSection; sectionY >= this.minLightSection; --sectionY) {
-+                    // check neighbours to see if we need to de-init this one
-+                    boolean allEmpty = true;
-+                    neighbour_search:
-+                    for (int dy2 = -1; dy2 <= 1; ++dy2) {
-+                        for (int dz2 = -1; dz2 <= 1; ++dz2) {
-+                            for (int dx2 = -1; dx2 <= 1; ++dx2) {
-+                                final int y = sectionY + dy2;
-+                                if (y < this.minSection || y > this.maxSection) {
-+                                    // empty
-+                                    continue;
-+                                }
-+                                final boolean[] emptinessMap = this.getEmptinessMap(dx + dx2 + chunkX, dz + dz2 + chunkZ);
-+                                if (emptinessMap != null) {
-+                                    if (!emptinessMap[y - this.minSection]) {
-+                                        allEmpty = false;
-+                                        break neighbour_search;
-+                                    }
-+                                } else {
-+                                    final LevelChunkSection section = this.getChunkSection(dx + dx2 + chunkX, y, dz + dz2 + chunkZ);
-+                                    if (section != null && !section.hasOnlyAir()) {
-+                                        allEmpty = false;
-+                                        break neighbour_search;
-+                                    }
-+                                }
-+                            }
-+                        }
-+                    }
-+
-+                    if (allEmpty & neighboursLoaded) {
-+                        // can only de-init when neighbours are loaded
-+                        // de-init is fine to delay, as de-init is just an optimisation - it's not required for lighting
-+                        // to be correct
-+
-+                        // all were empty, so de-init
-+                        this.setNibbleNull(dx + chunkX, sectionY, dz + chunkZ);
-+                    } else if (!allEmpty) {
-+                        // must init
-+                        final boolean extrude = (dx | dz) != 0 || !unlit;
-+                        this.initNibble(dx + chunkX, sectionY, dz + chunkZ, extrude, false);
-+                    }
-+                }
-+            }
-+        }
-+
-+        return ret;
-+    }
-+
-+    public final void checkChunkEdges(final LightChunkGetter lightAccess, final int chunkX, final int chunkZ) {
-+        this.setupCaches(lightAccess, chunkX * 16 + 7, 128, chunkZ * 16 + 7, true, false);
-+        try {
-+            final ChunkAccess chunk = this.getChunkInCache(chunkX, chunkZ);
-+            if (chunk == null) {
-+                return;
-+            }
-+            this.checkChunkEdges(lightAccess, chunk, this.minLightSection, this.maxLightSection);
-+            this.updateVisible(lightAccess);
-+        } finally {
-+            this.destroyCaches();
-+        }
-+    }
-+
-+    public final void checkChunkEdges(final LightChunkGetter lightAccess, final int chunkX, final int chunkZ, final ShortCollection sections) {
-+        this.setupCaches(lightAccess, chunkX * 16 + 7, 128, chunkZ * 16 + 7, true, false);
-+        try {
-+            final ChunkAccess chunk = this.getChunkInCache(chunkX, chunkZ);
-+            if (chunk == null) {
-+                return;
-+            }
-+            this.checkChunkEdges(lightAccess, chunk, sections);
-+            this.updateVisible(lightAccess);
-+        } finally {
-+            this.destroyCaches();
-+        }
-+    }
-+
-+    // subclasses should not initialise caches, as this will always be done by the super call
-+    // subclasses should not invoke updateVisible, as this will always be done by the super call
-+    // needsEdgeChecks applies when possibly loading vanilla data, which means we need to validate the current
-+    // chunks light values with respect to neighbours
-+    // subclasses should note that the emptiness changes are propagated BEFORE this is called, so this function
-+    // does not need to detect empty chunks itself (and it should do no handling for them either!)
-+    protected abstract void lightChunk(final LightChunkGetter lightAccess, final ChunkAccess chunk, final boolean needsEdgeChecks);
-+
-+    public final void light(final LightChunkGetter lightAccess, final ChunkAccess chunk, final Boolean[] emptySections) {
-+        final int chunkX = chunk.getPos().x;
-+        final int chunkZ = chunk.getPos().z;
-+        this.setupCaches(lightAccess, chunkX * 16 + 7, 128, chunkZ * 16 + 7, true, true);
-+
-+        try {
-+            final SWMRNibbleArray[] nibbles = getFilledEmptyLight(this.maxLightSection - this.minLightSection + 1);
-+            // force current chunk into cache
-+            this.setChunkInCache(chunkX, chunkZ, chunk);
-+            this.setBlocksForChunkInCache(chunkX, chunkZ, chunk.getSections());
-+            this.setNibblesForChunkInCache(chunkX, chunkZ, nibbles);
-+            this.setEmptinessMapCache(chunkX, chunkZ, this.getEmptinessMap(chunk));
-+
-+            final boolean[] ret = this.handleEmptySectionChanges(lightAccess, chunk, emptySections, true);
-+            if (ret != null) {
-+                this.setEmptinessMap(chunk, ret);
-+            }
-+            this.lightChunk(lightAccess, chunk, true);
-+            this.setNibbles(chunk, nibbles);
-+            this.updateVisible(lightAccess);
-+        } finally {
-+            this.destroyCaches();
-+        }
-+    }
-+
-+    public final void relightChunks(final LightChunkGetter lightAccess, final Set<ChunkPos> chunks,
-+                                    final Consumer<ChunkPos> chunkLightCallback, final IntConsumer onComplete) {
-+        // it's recommended for maximum performance that the set is ordered according to a BFS from the center of
-+        // the region of chunks to relight
-+        // it's required that tickets are added for each chunk to keep them loaded
-+        final Long2ObjectOpenHashMap<SWMRNibbleArray[]> nibblesByChunk = new Long2ObjectOpenHashMap<>();
-+        final Long2ObjectOpenHashMap<boolean[]> emptinessMapByChunk = new Long2ObjectOpenHashMap<>();
-+
-+        final int[] neighbourLightOrder = new int[] {
-+                // d = 0
-+                0, 0,
-+                // d = 1
-+                -1, 0,
-+                0, -1,
-+                1, 0,
-+                0, 1,
-+                // d = 2
-+                -1, 1,
-+                1, 1,
-+                -1, -1,
-+                1, -1,
-+        };
-+
-+        int lightCalls = 0;
-+
-+        for (final ChunkPos chunkPos : chunks) {
-+            final int chunkX = chunkPos.x;
-+            final int chunkZ = chunkPos.z;
-+            final ChunkAccess chunk = (ChunkAccess)lightAccess.getChunkForLighting(chunkX, chunkZ);
-+            if (chunk == null || !this.canUseChunk(chunk)) {
-+                throw new IllegalStateException();
-+            }
-+
-+            for (int i = 0, len = neighbourLightOrder.length; i < len; i += 2) {
-+                final int dx = neighbourLightOrder[i];
-+                final int dz = neighbourLightOrder[i + 1];
-+                final int neighbourX = dx + chunkX;
-+                final int neighbourZ = dz + chunkZ;
-+
-+                final ChunkAccess neighbour = (ChunkAccess)lightAccess.getChunkForLighting(neighbourX, neighbourZ);
-+                if (neighbour == null || !this.canUseChunk(neighbour)) {
-+                    continue;
-+                }
-+
-+                if (nibblesByChunk.get(CoordinateUtils.getChunkKey(neighbourX, neighbourZ)) != null) {
-+                    // lit already called for neighbour, no need to light it now
-+                    continue;
-+                }
-+
-+                // light neighbour chunk
-+                this.setupEncodeOffset(neighbourX * 16 + 7, 128, neighbourZ * 16 + 7);
-+                try {
-+                    // insert all neighbouring chunks for this neighbour that we have data for
-+                    for (int dz2 = -1; dz2 <= 1; ++dz2) {
-+                        for (int dx2 = -1; dx2 <= 1; ++dx2) {
-+                            final int neighbourX2 = neighbourX + dx2;
-+                            final int neighbourZ2 = neighbourZ + dz2;
-+                            final long key = CoordinateUtils.getChunkKey(neighbourX2, neighbourZ2);
-+                            final ChunkAccess neighbour2 = (ChunkAccess)lightAccess.getChunkForLighting(neighbourX2, neighbourZ2);
-+                            if (neighbour2 == null || !this.canUseChunk(neighbour2)) {
-+                                continue;
-+                            }
-+
-+                            final SWMRNibbleArray[] nibbles = nibblesByChunk.get(key);
-+                            if (nibbles == null) {
-+                                // we haven't lit this chunk
-+                                continue;
-+                            }
-+
-+                            this.setChunkInCache(neighbourX2, neighbourZ2, neighbour2);
-+                            this.setBlocksForChunkInCache(neighbourX2, neighbourZ2, neighbour2.getSections());
-+                            this.setNibblesForChunkInCache(neighbourX2, neighbourZ2, nibbles);
-+                            this.setEmptinessMapCache(neighbourX2, neighbourZ2, emptinessMapByChunk.get(key));
-+                        }
-+                    }
-+
-+                    final long key = CoordinateUtils.getChunkKey(neighbourX, neighbourZ);
-+
-+                    // now insert the neighbour chunk and light it
-+                    final SWMRNibbleArray[] nibbles = getFilledEmptyLight(this.world);
-+                    nibblesByChunk.put(key, nibbles);
-+
-+                    this.setChunkInCache(neighbourX, neighbourZ, neighbour);
-+                    this.setBlocksForChunkInCache(neighbourX, neighbourZ, neighbour.getSections());
-+                    this.setNibblesForChunkInCache(neighbourX, neighbourZ, nibbles);
-+
-+                    final boolean[] neighbourEmptiness = this.handleEmptySectionChanges(lightAccess, neighbour, getEmptySectionsForChunk(neighbour), true);
-+                    emptinessMapByChunk.put(key, neighbourEmptiness);
-+                    if (chunks.contains(new ChunkPos(neighbourX, neighbourZ))) {
-+                        this.setEmptinessMap(neighbour, neighbourEmptiness);
-+                    }
-+
-+                    this.lightChunk(lightAccess, neighbour, false);
-+                } finally {
-+                    this.destroyCaches();
-+                }
-+            }
-+
-+            // done lighting all neighbours, so the chunk is now fully lit
-+
-+            // make sure nibbles are fully updated before calling back
-+            final SWMRNibbleArray[] nibbles = nibblesByChunk.get(CoordinateUtils.getChunkKey(chunkX, chunkZ));
-+            for (final SWMRNibbleArray nibble : nibbles) {
-+                nibble.updateVisible();
-+            }
-+
-+            this.setNibbles(chunk, nibbles);
-+
-+            for (int y = this.minLightSection; y <= this.maxLightSection; ++y) {
-+                lightAccess.onLightUpdate(this.skylightPropagator ? LightLayer.SKY : LightLayer.BLOCK, SectionPos.of(chunkX, y, chunkX));
-+            }
-+
-+            // now do callback
-+            if (chunkLightCallback != null) {
-+                chunkLightCallback.accept(chunkPos);
-+            }
-+            ++lightCalls;
-+        }
-+
-+        if (onComplete != null) {
-+            onComplete.accept(lightCalls);
-+        }
-+    }
-+
-+    // contains:
-+    // lower (6 + 6 + 16) = 28 bits: encoded coordinate position (x | (z << 6) | (y << (6 + 6))))
-+    // next 4 bits: propagated light level (0, 15]
-+    // next 6 bits: propagation direction bitset
-+    // next 24 bits: unused
-+    // last 3 bits: state flags
-+    // state flags:
-+    // whether the increase propagator needs to write the propagated level to the position, used to avoid cascading light
-+    // updates for block sources
-+    protected static final long FLAG_WRITE_LEVEL = Long.MIN_VALUE >>> 2;
-+    // whether the propagation needs to check if its current level is equal to the expected level
-+    // used only in increase propagation
-+    protected static final long FLAG_RECHECK_LEVEL = Long.MIN_VALUE >>> 1;
-+    // whether the propagation needs to consider if its block is conditionally transparent
-+    protected static final long FLAG_HAS_SIDED_TRANSPARENT_BLOCKS = Long.MIN_VALUE;
-+
-+    protected long[] increaseQueue = new long[16 * 16 * 16];
-+    protected int increaseQueueInitialLength;
-+    protected long[] decreaseQueue = new long[16 * 16 * 16];
-+    protected int decreaseQueueInitialLength;
-+
-+    protected final long[] resizeIncreaseQueue() {
-+        return this.increaseQueue = Arrays.copyOf(this.increaseQueue, this.increaseQueue.length * 2);
-+    }
-+
-+    protected final long[] resizeDecreaseQueue() {
-+        return this.decreaseQueue = Arrays.copyOf(this.decreaseQueue, this.decreaseQueue.length * 2);
-+    }
-+
-+    protected final void appendToIncreaseQueue(final long value) {
-+        final int idx = this.increaseQueueInitialLength++;
-+        long[] queue = this.increaseQueue;
-+        if (idx >= queue.length) {
-+            queue = this.resizeIncreaseQueue();
-+            queue[idx] = value;
-+        } else {
-+            queue[idx] = value;
-+        }
-+    }
-+
-+    protected final void appendToDecreaseQueue(final long value) {
-+        final int idx = this.decreaseQueueInitialLength++;
-+        long[] queue = this.decreaseQueue;
-+        if (idx >= queue.length) {
-+            queue = this.resizeDecreaseQueue();
-+            queue[idx] = value;
-+        } else {
-+            queue[idx] = value;
-+        }
-+    }
-+
-+    protected static final AxisDirection[][] OLD_CHECK_DIRECTIONS = new AxisDirection[1 << 6][];
-+    protected static final int ALL_DIRECTIONS_BITSET = (1 << 6) - 1;
-+    static {
-+        for (int i = 0; i < OLD_CHECK_DIRECTIONS.length; ++i) {
-+            final List<AxisDirection> directions = new ArrayList<>();
-+            for (int bitset = i, len = Integer.bitCount(i), index = 0; index < len; ++index, bitset ^= IntegerUtil.getTrailingBit(bitset)) {
-+                directions.add(AXIS_DIRECTIONS[IntegerUtil.trailingZeros(bitset)]);
-+            }
-+            OLD_CHECK_DIRECTIONS[i] = directions.toArray(new AxisDirection[0]);
-+        }
-+    }
-+
-+    protected final void performLightIncrease(final LightChunkGetter lightAccess) {
-+        final BlockGetter world = lightAccess.getLevel();
-+        long[] queue = this.increaseQueue;
-+        int queueReadIndex = 0;
-+        int queueLength = this.increaseQueueInitialLength;
-+        this.increaseQueueInitialLength = 0;
-+        final int decodeOffsetX = -this.encodeOffsetX;
-+        final int decodeOffsetY = -this.encodeOffsetY;
-+        final int decodeOffsetZ = -this.encodeOffsetZ;
-+        final int encodeOffset = this.coordinateOffset;
-+        final int sectionOffset = this.chunkSectionIndexOffset;
-+
-+        while (queueReadIndex < queueLength) {
-+            final long queueValue = queue[queueReadIndex++];
-+
-+            final int posX = ((int)queueValue & 63) + decodeOffsetX;
-+            final int posZ = (((int)queueValue >>> 6) & 63) + decodeOffsetZ;
-+            final int posY = (((int)queueValue >>> 12) & ((1 << 16) - 1)) + decodeOffsetY;
-+            final int propagatedLightLevel = (int)((queueValue >>> (6 + 6 + 16)) & 0xFL);
-+            final AxisDirection[] checkDirections = OLD_CHECK_DIRECTIONS[(int)((queueValue >>> (6 + 6 + 16 + 4)) & 63L)];
-+
-+            if ((queueValue & FLAG_RECHECK_LEVEL) != 0L) {
-+                if (this.getLightLevel(posX, posY, posZ) != propagatedLightLevel) {
-+                    // not at the level we expect, so something changed.
-+                    continue;
-+                }
-+            } else if ((queueValue & FLAG_WRITE_LEVEL) != 0L) {
-+                // these are used to restore block sources after a propagation decrease
-+                this.setLightLevel(posX, posY, posZ, propagatedLightLevel);
-+            }
-+
-+            if ((queueValue & FLAG_HAS_SIDED_TRANSPARENT_BLOCKS) == 0L) {
-+                // we don't need to worry about our state here.
-+                for (final AxisDirection propagate : checkDirections) {
-+                    final int offX = posX + propagate.x;
-+                    final int offY = posY + propagate.y;
-+                    final int offZ = posZ + propagate.z;
-+
-+                    final int sectionIndex = (offX >> 4) + 5 * (offZ >> 4) + (5 * 5) * (offY >> 4) + sectionOffset;
-+                    final int localIndex = (offX & 15) | ((offZ & 15) << 4) | ((offY & 15) << 8);
-+
-+                    final SWMRNibbleArray currentNibble = this.nibbleCache[sectionIndex];
-+                    final int currentLevel;
-+                    if (currentNibble == null || (currentLevel = currentNibble.getUpdating(localIndex)) >= (propagatedLightLevel - 1)) {
-+                        continue; // already at the level we want or unloaded
-+                    }
-+
-+                    final BlockState blockState = this.getBlockState(sectionIndex, localIndex);
-+                    if (blockState == null) {
-+                        continue;
-+                    }
-+                    final int opacityCached = blockState.getOpacityIfCached();
-+                    if (opacityCached != -1) {
-+                        final int targetLevel = propagatedLightLevel - Math.max(1, opacityCached);
-+                        if (targetLevel > currentLevel) {
-+                            currentNibble.set(localIndex, targetLevel);
-+                            this.postLightUpdate(offX, offY, offZ);
-+
-+                            if (targetLevel > 1) {
-+                                if (queueLength >= queue.length) {
-+                                    queue = this.resizeIncreaseQueue();
-+                                }
-+                                queue[queueLength++] =
-+                                        ((offX + (offZ << 6) + (offY << 12) + encodeOffset) & ((1L << (6 + 6 + 16)) - 1))
-+                                                | ((targetLevel & 0xFL) << (6 + 6 + 16))
-+                                                | (propagate.everythingButTheOppositeDirection << (6 + 6 + 16 + 4));
-+                                continue;
-+                            }
-+                        }
-+                        continue;
-+                    } else {
-+                        this.mutablePos1.set(offX, offY, offZ);
-+                        long flags = 0;
-+                        if (blockState.isConditionallyFullOpaque()) {
-+                            final VoxelShape cullingFace = blockState.getFaceOcclusionShape(world, this.mutablePos1, propagate.getOpposite().nms);
-+
-+                            if (Shapes.faceShapeOccludes(Shapes.empty(), cullingFace)) {
-+                                continue;
-+                            }
-+                            flags |= FLAG_HAS_SIDED_TRANSPARENT_BLOCKS;
-+                        }
-+
-+                        final int opacity = blockState.getLightBlock(world, this.mutablePos1);
-+                        final int targetLevel = propagatedLightLevel - Math.max(1, opacity);
-+                        if (targetLevel <= currentLevel) {
-+                            continue;
-+                        }
-+
-+                        currentNibble.set(localIndex, targetLevel);
-+                        this.postLightUpdate(offX, offY, offZ);
-+
-+                        if (targetLevel > 1) {
-+                            if (queueLength >= queue.length) {
-+                                queue = this.resizeIncreaseQueue();
-+                            }
-+                            queue[queueLength++] =
-+                                    ((offX + (offZ << 6) + (offY << 12) + encodeOffset) & ((1L << (6 + 6 + 16)) - 1))
-+                                            | ((targetLevel & 0xFL) << (6 + 6 + 16))
-+                                            | (propagate.everythingButTheOppositeDirection << (6 + 6 + 16 + 4))
-+                                            | (flags);
-+                        }
-+                        continue;
-+                    }
-+                }
-+            } else {
-+                // we actually need to worry about our state here
-+                final BlockState fromBlock = this.getBlockState(posX, posY, posZ);
-+                this.mutablePos2.set(posX, posY, posZ);
-+                for (final AxisDirection propagate : checkDirections) {
-+                    final int offX = posX + propagate.x;
-+                    final int offY = posY + propagate.y;
-+                    final int offZ = posZ + propagate.z;
-+
-+                    final VoxelShape fromShape = fromBlock.isConditionallyFullOpaque() ? fromBlock.getFaceOcclusionShape(world, this.mutablePos2, propagate.nms) : Shapes.empty();
-+
-+                    if (fromShape != Shapes.empty() && Shapes.faceShapeOccludes(Shapes.empty(), fromShape)) {
-+                        continue;
-+                    }
-+
-+                    final int sectionIndex = (offX >> 4) + 5 * (offZ >> 4) + (5 * 5) * (offY >> 4) + sectionOffset;
-+                    final int localIndex = (offX & 15) | ((offZ & 15) << 4) | ((offY & 15) << 8);
-+
-+                    final SWMRNibbleArray currentNibble = this.nibbleCache[sectionIndex];
-+                    final int currentLevel;
-+
-+                    if (currentNibble == null || (currentLevel = currentNibble.getUpdating(localIndex)) >= (propagatedLightLevel - 1)) {
-+                        continue; // already at the level we want
-+                    }
-+
-+                    final BlockState blockState = this.getBlockState(sectionIndex, localIndex);
-+                    if (blockState == null) {
-+                        continue;
-+                    }
-+                    final int opacityCached = blockState.getOpacityIfCached();
-+                    if (opacityCached != -1) {
-+                        final int targetLevel = propagatedLightLevel - Math.max(1, opacityCached);
-+                        if (targetLevel > currentLevel) {
-+                            currentNibble.set(localIndex, targetLevel);
-+                            this.postLightUpdate(offX, offY, offZ);
-+
-+                            if (targetLevel > 1) {
-+                                if (queueLength >= queue.length) {
-+                                    queue = this.resizeIncreaseQueue();
-+                                }
-+                                queue[queueLength++] =
-+                                        ((offX + (offZ << 6) + (offY << 12) + encodeOffset) & ((1L << (6 + 6 + 16)) - 1))
-+                                                | ((targetLevel & 0xFL) << (6 + 6 + 16))
-+                                                | (propagate.everythingButTheOppositeDirection << (6 + 6 + 16 + 4));
-+                                continue;
-+                            }
-+                        }
-+                        continue;
-+                    } else {
-+                        this.mutablePos1.set(offX, offY, offZ);
-+                        long flags = 0;
-+                        if (blockState.isConditionallyFullOpaque()) {
-+                            final VoxelShape cullingFace = blockState.getFaceOcclusionShape(world, this.mutablePos1, propagate.getOpposite().nms);
-+
-+                            if (Shapes.faceShapeOccludes(fromShape, cullingFace)) {
-+                                continue;
-+                            }
-+                            flags |= FLAG_HAS_SIDED_TRANSPARENT_BLOCKS;
-+                        }
-+
-+                        final int opacity = blockState.getLightBlock(world, this.mutablePos1);
-+                        final int targetLevel = propagatedLightLevel - Math.max(1, opacity);
-+                        if (targetLevel <= currentLevel) {
-+                            continue;
-+                        }
-+
-+                        currentNibble.set(localIndex, targetLevel);
-+                        this.postLightUpdate(offX, offY, offZ);
-+
-+                        if (targetLevel > 1) {
-+                            if (queueLength >= queue.length) {
-+                                queue = this.resizeIncreaseQueue();
-+                            }
-+                            queue[queueLength++] =
-+                                    ((offX + (offZ << 6) + (offY << 12) + encodeOffset) & ((1L << (6 + 6 + 16)) - 1))
-+                                            | ((targetLevel & 0xFL) << (6 + 6 + 16))
-+                                            | (propagate.everythingButTheOppositeDirection << (6 + 6 + 16 + 4))
-+                                            | (flags);
-+                        }
-+                        continue;
-+                    }
-+                }
-+            }
-+        }
-+    }
-+
-+    protected final void performLightDecrease(final LightChunkGetter lightAccess) {
-+        final BlockGetter world = lightAccess.getLevel();
-+        long[] queue = this.decreaseQueue;
-+        long[] increaseQueue = this.increaseQueue;
-+        int queueReadIndex = 0;
-+        int queueLength = this.decreaseQueueInitialLength;
-+        this.decreaseQueueInitialLength = 0;
-+        int increaseQueueLength = this.increaseQueueInitialLength;
-+        final int decodeOffsetX = -this.encodeOffsetX;
-+        final int decodeOffsetY = -this.encodeOffsetY;
-+        final int decodeOffsetZ = -this.encodeOffsetZ;
-+        final int encodeOffset = this.coordinateOffset;
-+        final int sectionOffset = this.chunkSectionIndexOffset;
-+        final int emittedMask = this.emittedLightMask;
-+
-+        while (queueReadIndex < queueLength) {
-+            final long queueValue = queue[queueReadIndex++];
-+
-+            final int posX = ((int)queueValue & 63) + decodeOffsetX;
-+            final int posZ = (((int)queueValue >>> 6) & 63) + decodeOffsetZ;
-+            final int posY = (((int)queueValue >>> 12) & ((1 << 16) - 1)) + decodeOffsetY;
-+            final int propagatedLightLevel = (int)((queueValue >>> (6 + 6 + 16)) & 0xF);
-+            final AxisDirection[] checkDirections = OLD_CHECK_DIRECTIONS[(int)((queueValue >>> (6 + 6 + 16 + 4)) & 63)];
-+
-+            if ((queueValue & FLAG_HAS_SIDED_TRANSPARENT_BLOCKS) == 0L) {
-+                // we don't need to worry about our state here.
-+                for (final AxisDirection propagate : checkDirections) {
-+                    final int offX = posX + propagate.x;
-+                    final int offY = posY + propagate.y;
-+                    final int offZ = posZ + propagate.z;
-+
-+                    final int sectionIndex = (offX >> 4) + 5 * (offZ >> 4) + (5 * 5) * (offY >> 4) + sectionOffset;
-+                    final int localIndex = (offX & 15) | ((offZ & 15) << 4) | ((offY & 15) << 8);
-+
-+                    final SWMRNibbleArray currentNibble = this.nibbleCache[sectionIndex];
-+                    final int lightLevel;
-+
-+                    if (currentNibble == null || (lightLevel = currentNibble.getUpdating(localIndex)) == 0) {
-+                        // already at lowest (or unloaded), nothing we can do
-+                        continue;
-+                    }
-+
-+                    final BlockState blockState = this.getBlockState(sectionIndex, localIndex);
-+                    if (blockState == null) {
-+                        continue;
-+                    }
-+                    final int opacityCached = blockState.getOpacityIfCached();
-+                    if (opacityCached != -1) {
-+                        final int targetLevel = Math.max(0, propagatedLightLevel - Math.max(1, opacityCached));
-+                        if (lightLevel > targetLevel) {
-+                            // it looks like another source propagated here, so re-propagate it
-+                            if (increaseQueueLength >= increaseQueue.length) {
-+                                increaseQueue = this.resizeIncreaseQueue();
-+                            }
-+                            increaseQueue[increaseQueueLength++] =
-+                                    ((offX + (offZ << 6) + (offY << 12) + encodeOffset) & ((1L << (6 + 6 + 16)) - 1))
-+                                            | ((lightLevel & 0xFL) << (6 + 6 + 16))
-+                                            | (((long)ALL_DIRECTIONS_BITSET) << (6 + 6 + 16 + 4))
-+                                            | FLAG_RECHECK_LEVEL;
-+                            continue;
-+                        }
-+                        final int emittedLight = blockState.getLightEmission() & emittedMask;
-+                        if (emittedLight != 0) {
-+                            // re-propagate source
-+                            // note: do not set recheck level, or else the propagation will fail
-+                            if (increaseQueueLength >= increaseQueue.length) {
-+                                increaseQueue = this.resizeIncreaseQueue();
-+                            }
-+                            increaseQueue[increaseQueueLength++] =
-+                                    ((offX + (offZ << 6) + (offY << 12) + encodeOffset) & ((1L << (6 + 6 + 16)) - 1))
-+                                            | ((emittedLight & 0xFL) << (6 + 6 + 16))
-+                                            | (((long)ALL_DIRECTIONS_BITSET) << (6 + 6 + 16 + 4))
-+                                            | (blockState.isConditionallyFullOpaque() ? (FLAG_WRITE_LEVEL | FLAG_HAS_SIDED_TRANSPARENT_BLOCKS) : FLAG_WRITE_LEVEL);
-+                        }
-+
-+                        currentNibble.set(localIndex, 0);
-+                        this.postLightUpdate(offX, offY, offZ);
-+
-+                        if (targetLevel > 0) { // we actually need to propagate 0 just in case we find a neighbour...
-+                            if (queueLength >= queue.length) {
-+                                queue = this.resizeDecreaseQueue();
-+                            }
-+                            queue[queueLength++] =
-+                                    ((offX + (offZ << 6) + (offY << 12) + encodeOffset) & ((1L << (6 + 6 + 16)) - 1))
-+                                            | ((targetLevel & 0xFL) << (6 + 6 + 16))
-+                                            | ((propagate.everythingButTheOppositeDirection) << (6 + 6 + 16 + 4));
-+                            continue;
-+                        }
-+                        continue;
-+                    } else {
-+                        this.mutablePos1.set(offX, offY, offZ);
-+                        long flags = 0;
-+                        if (blockState.isConditionallyFullOpaque()) {
-+                            final VoxelShape cullingFace = blockState.getFaceOcclusionShape(world, this.mutablePos1, propagate.getOpposite().nms);
-+
-+                            if (Shapes.faceShapeOccludes(Shapes.empty(), cullingFace)) {
-+                                continue;
-+                            }
-+                            flags |= FLAG_HAS_SIDED_TRANSPARENT_BLOCKS;
-+                        }
-+
-+                        final int opacity = blockState.getLightBlock(world, this.mutablePos1);
-+                        final int targetLevel = Math.max(0, propagatedLightLevel - Math.max(1, opacity));
-+                        if (lightLevel > targetLevel) {
-+                            // it looks like another source propagated here, so re-propagate it
-+                            if (increaseQueueLength >= increaseQueue.length) {
-+                                increaseQueue = this.resizeIncreaseQueue();
-+                            }
-+                            increaseQueue[increaseQueueLength++] =
-+                                    ((offX + (offZ << 6) + (offY << 12) + encodeOffset) & ((1L << (6 + 6 + 16)) - 1))
-+                                            | ((lightLevel & 0xFL) << (6 + 6 + 16))
-+                                            | (((long)ALL_DIRECTIONS_BITSET) << (6 + 6 + 16 + 4))
-+                                            | (FLAG_RECHECK_LEVEL | flags);
-+                            continue;
-+                        }
-+                        final int emittedLight = blockState.getLightEmission() & emittedMask;
-+                        if (emittedLight != 0) {
-+                            // re-propagate source
-+                            // note: do not set recheck level, or else the propagation will fail
-+                            if (increaseQueueLength >= increaseQueue.length) {
-+                                increaseQueue = this.resizeIncreaseQueue();
-+                            }
-+                            increaseQueue[increaseQueueLength++] =
-+                                    ((offX + (offZ << 6) + (offY << 12) + encodeOffset) & ((1L << (6 + 6 + 16)) - 1))
-+                                            | ((emittedLight & 0xFL) << (6 + 6 + 16))
-+                                            | (((long)ALL_DIRECTIONS_BITSET) << (6 + 6 + 16 + 4))
-+                                            | (flags | FLAG_WRITE_LEVEL);
-+                        }
-+
-+                        currentNibble.set(localIndex, 0);
-+                        this.postLightUpdate(offX, offY, offZ);
-+
-+                        if (targetLevel > 0) {
-+                            if (queueLength >= queue.length) {
-+                                queue = this.resizeDecreaseQueue();
-+                            }
-+                            queue[queueLength++] =
-+                                    ((offX + (offZ << 6) + (offY << 12) + encodeOffset) & ((1L << (6 + 6 + 16)) - 1))
-+                                            | ((targetLevel & 0xFL) << (6 + 6 + 16))
-+                                            | ((propagate.everythingButTheOppositeDirection) << (6 + 6 + 16 + 4))
-+                                            | flags;
-+                        }
-+                        continue;
-+                    }
-+                }
-+            } else {
-+                // we actually need to worry about our state here
-+                final BlockState fromBlock = this.getBlockState(posX, posY, posZ);
-+                this.mutablePos2.set(posX, posY, posZ);
-+                for (final AxisDirection propagate : checkDirections) {
-+                    final int offX = posX + propagate.x;
-+                    final int offY = posY + propagate.y;
-+                    final int offZ = posZ + propagate.z;
-+
-+                    final int sectionIndex = (offX >> 4) + 5 * (offZ >> 4) + (5 * 5) * (offY >> 4) + sectionOffset;
-+                    final int localIndex = (offX & 15) | ((offZ & 15) << 4) | ((offY & 15) << 8);
-+
-+                    final VoxelShape fromShape = (fromBlock.isConditionallyFullOpaque()) ? fromBlock.getFaceOcclusionShape(world, this.mutablePos2, propagate.nms) : Shapes.empty();
-+
-+                    if (fromShape != Shapes.empty() && Shapes.faceShapeOccludes(Shapes.empty(), fromShape)) {
-+                        continue;
-+                    }
-+
-+                    final SWMRNibbleArray currentNibble = this.nibbleCache[sectionIndex];
-+                    final int lightLevel;
-+
-+                    if (currentNibble == null || (lightLevel = currentNibble.getUpdating(localIndex)) == 0) {
-+                        // already at lowest (or unloaded), nothing we can do
-+                        continue;
-+                    }
-+
-+                    final BlockState blockState = this.getBlockState(sectionIndex, localIndex);
-+                    if (blockState == null) {
-+                        continue;
-+                    }
-+                    final int opacityCached = blockState.getOpacityIfCached();
-+                    if (opacityCached != -1) {
-+                        final int targetLevel = Math.max(0, propagatedLightLevel - Math.max(1, opacityCached));
-+                        if (lightLevel > targetLevel) {
-+                            // it looks like another source propagated here, so re-propagate it
-+                            if (increaseQueueLength >= increaseQueue.length) {
-+                                increaseQueue = this.resizeIncreaseQueue();
-+                            }
-+                            increaseQueue[increaseQueueLength++] =
-+                                    ((offX + (offZ << 6) + (offY << 12) + encodeOffset) & ((1L << (6 + 6 + 16)) - 1))
-+                                            | ((lightLevel & 0xFL) << (6 + 6 + 16))
-+                                            | (((long)ALL_DIRECTIONS_BITSET) << (6 + 6 + 16 + 4))
-+                                            | FLAG_RECHECK_LEVEL;
-+                            continue;
-+                        }
-+                        final int emittedLight = blockState.getLightEmission() & emittedMask;
-+                        if (emittedLight != 0) {
-+                            // re-propagate source
-+                            // note: do not set recheck level, or else the propagation will fail
-+                            if (increaseQueueLength >= increaseQueue.length) {
-+                                increaseQueue = this.resizeIncreaseQueue();
-+                            }
-+                            increaseQueue[increaseQueueLength++] =
-+                                    ((offX + (offZ << 6) + (offY << 12) + encodeOffset) & ((1L << (6 + 6 + 16)) - 1))
-+                                            | ((emittedLight & 0xFL) << (6 + 6 + 16))
-+                                            | (((long)ALL_DIRECTIONS_BITSET) << (6 + 6 + 16 + 4))
-+                                            | (blockState.isConditionallyFullOpaque() ? (FLAG_WRITE_LEVEL | FLAG_HAS_SIDED_TRANSPARENT_BLOCKS) : FLAG_WRITE_LEVEL);
-+                        }
-+
-+                        currentNibble.set(localIndex, 0);
-+                        this.postLightUpdate(offX, offY, offZ);
-+
-+                        if (targetLevel > 0) { // we actually need to propagate 0 just in case we find a neighbour...
-+                            if (queueLength >= queue.length) {
-+                                queue = this.resizeDecreaseQueue();
-+                            }
-+                            queue[queueLength++] =
-+                                    ((offX + (offZ << 6) + (offY << 12) + encodeOffset) & ((1L << (6 + 6 + 16)) - 1))
-+                                            | ((targetLevel & 0xFL) << (6 + 6 + 16))
-+                                            | ((propagate.everythingButTheOppositeDirection) << (6 + 6 + 16 + 4));
-+                            continue;
-+                        }
-+                        continue;
-+                    } else {
-+                        this.mutablePos1.set(offX, offY, offZ);
-+                        long flags = 0;
-+                        if (blockState.isConditionallyFullOpaque()) {
-+                            final VoxelShape cullingFace = blockState.getFaceOcclusionShape(world, this.mutablePos1, propagate.getOpposite().nms);
-+
-+                            if (Shapes.faceShapeOccludes(fromShape, cullingFace)) {
-+                                continue;
-+                            }
-+                            flags |= FLAG_HAS_SIDED_TRANSPARENT_BLOCKS;
-+                        }
-+
-+                        final int opacity = blockState.getLightBlock(world, this.mutablePos1);
-+                        final int targetLevel = Math.max(0, propagatedLightLevel - Math.max(1, opacity));
-+                        if (lightLevel > targetLevel) {
-+                            // it looks like another source propagated here, so re-propagate it
-+                            if (increaseQueueLength >= increaseQueue.length) {
-+                                increaseQueue = this.resizeIncreaseQueue();
-+                            }
-+                            increaseQueue[increaseQueueLength++] =
-+                                    ((offX + (offZ << 6) + (offY << 12) + encodeOffset) & ((1L << (6 + 6 + 16)) - 1))
-+                                            | ((lightLevel & 0xFL) << (6 + 6 + 16))
-+                                            | (((long)ALL_DIRECTIONS_BITSET) << (6 + 6 + 16 + 4))
-+                                            | (FLAG_RECHECK_LEVEL | flags);
-+                            continue;
-+                        }
-+                        final int emittedLight = blockState.getLightEmission() & emittedMask;
-+                        if (emittedLight != 0) {
-+                            // re-propagate source
-+                            // note: do not set recheck level, or else the propagation will fail
-+                            if (increaseQueueLength >= increaseQueue.length) {
-+                                increaseQueue = this.resizeIncreaseQueue();
-+                            }
-+                            increaseQueue[increaseQueueLength++] =
-+                                    ((offX + (offZ << 6) + (offY << 12) + encodeOffset) & ((1L << (6 + 6 + 16)) - 1))
-+                                            | ((emittedLight & 0xFL) << (6 + 6 + 16))
-+                                            | (((long)ALL_DIRECTIONS_BITSET) << (6 + 6 + 16 + 4))
-+                                            | (flags | FLAG_WRITE_LEVEL);
-+                        }
-+
-+                        currentNibble.set(localIndex, 0);
-+                        this.postLightUpdate(offX, offY, offZ);
-+
-+                        if (targetLevel > 0) { // we actually need to propagate 0 just in case we find a neighbour...
-+                            if (queueLength >= queue.length) {
-+                                queue = this.resizeDecreaseQueue();
-+                            }
-+                            queue[queueLength++] =
-+                                    ((offX + (offZ << 6) + (offY << 12) + encodeOffset) & ((1L << (6 + 6 + 16)) - 1))
-+                                            | ((targetLevel & 0xFL) << (6 + 6 + 16))
-+                                            | ((propagate.everythingButTheOppositeDirection) << (6 + 6 + 16 + 4))
-+                                            | flags;
-+                        }
-+                        continue;
-+                    }
-+                }
-+            }
-+        }
-+
-+        // propagate sources we clobbered
-+        this.increaseQueueInitialLength = increaseQueueLength;
-+        this.performLightIncrease(lightAccess);
-+    }
-+}
-diff --git a/src/main/java/ca/spottedleaf/starlight/common/light/StarLightInterface.java b/src/main/java/ca/spottedleaf/starlight/common/light/StarLightInterface.java
-new file mode 100644
-index 0000000000000000000000000000000000000000..e0338db4d6fa359029ed5edeacc3646aa98701f5
---- /dev/null
-+++ b/src/main/java/ca/spottedleaf/starlight/common/light/StarLightInterface.java
-@@ -0,0 +1,674 @@
-+package ca.spottedleaf.starlight.common.light;
-+
-+import ca.spottedleaf.starlight.common.util.CoordinateUtils;
-+import ca.spottedleaf.starlight.common.util.WorldUtil;
-+import it.unimi.dsi.fastutil.longs.Long2ObjectLinkedOpenHashMap;
-+import it.unimi.dsi.fastutil.shorts.ShortCollection;
-+import it.unimi.dsi.fastutil.shorts.ShortOpenHashSet;
-+import it.unimi.dsi.fastutil.objects.ObjectOpenHashSet;
-+import net.minecraft.core.BlockPos;
-+import net.minecraft.core.SectionPos;
-+import net.minecraft.server.level.ServerChunkCache;
-+import net.minecraft.server.level.ServerLevel;
-+import net.minecraft.server.level.TicketType;
-+import net.minecraft.world.level.ChunkPos;
-+import net.minecraft.world.level.Level;
-+import net.minecraft.world.level.chunk.ChunkAccess;
-+import net.minecraft.world.level.chunk.status.ChunkStatus;
-+import net.minecraft.world.level.chunk.DataLayer;
-+import net.minecraft.world.level.chunk.LevelChunk;
-+import net.minecraft.world.level.chunk.LightChunkGetter;
-+import net.minecraft.world.level.lighting.LayerLightEventListener;
-+import net.minecraft.world.level.lighting.LevelLightEngine;
-+import java.util.ArrayDeque;
-+import java.util.ArrayList;
-+import java.util.List;
-+import java.util.Set;
-+import java.util.concurrent.CompletableFuture;
-+import java.util.function.Consumer;
-+import java.util.function.IntConsumer;
-+
-+public final class StarLightInterface {
-+
-+    public static final TicketType<ChunkPos> CHUNK_WORK_TICKET = TicketType.create("starlight_chunk_work_ticket", (p1, p2) -> Long.compare(p1.toLong(), p2.toLong()));
-+
-+    /**
-+     * Can be {@code null}, indicating the light is all empty.
-+     */
-+    protected final Level world;
-+    protected final LightChunkGetter lightAccess;
-+
-+    protected final ArrayDeque<SkyStarLightEngine> cachedSkyPropagators;
-+    protected final ArrayDeque<BlockStarLightEngine> cachedBlockPropagators;
-+
-+    protected final LightQueue lightQueue = new LightQueue(this);
-+
-+    protected final LayerLightEventListener skyReader;
-+    protected final LayerLightEventListener blockReader;
-+    protected final boolean isClientSide;
-+
-+    protected final int minSection;
-+    protected final int maxSection;
-+    protected final int minLightSection;
-+    protected final int maxLightSection;
-+
-+    public final LevelLightEngine lightEngine;
-+
-+    private final boolean hasBlockLight;
-+    private final boolean hasSkyLight;
-+
-+    public StarLightInterface(final LightChunkGetter lightAccess, final boolean hasSkyLight, final boolean hasBlockLight, final LevelLightEngine lightEngine) {
-+        this.lightAccess = lightAccess;
-+        this.world = lightAccess == null ? null : (Level)lightAccess.getLevel();
-+        this.cachedSkyPropagators = hasSkyLight && lightAccess != null ? new ArrayDeque<>() : null;
-+        this.cachedBlockPropagators = hasBlockLight && lightAccess != null ? new ArrayDeque<>() : null;
-+        this.isClientSide = !(this.world instanceof ServerLevel);
-+        if (this.world == null) {
-+            this.minSection = -4;
-+            this.maxSection = 19;
-+            this.minLightSection = -5;
-+            this.maxLightSection = 20;
-+        } else {
-+            this.minSection = WorldUtil.getMinSection(this.world);
-+            this.maxSection = WorldUtil.getMaxSection(this.world);
-+            this.minLightSection = WorldUtil.getMinLightSection(this.world);
-+            this.maxLightSection = WorldUtil.getMaxLightSection(this.world);
-+        }
-+        this.lightEngine = lightEngine;
-+        this.hasBlockLight = hasBlockLight;
-+        this.hasSkyLight = hasSkyLight;
-+        this.skyReader = !hasSkyLight ? LayerLightEventListener.DummyLightLayerEventListener.INSTANCE : new LayerLightEventListener() {
-+            @Override
-+            public void checkBlock(final BlockPos blockPos) {
-+                StarLightInterface.this.lightEngine.checkBlock(blockPos.immutable());
-+            }
-+
-+            @Override
-+            public void propagateLightSources(final ChunkPos chunkPos) {
-+                throw new UnsupportedOperationException();
-+            }
-+
-+            @Override
-+            public boolean hasLightWork() {
-+                // not really correct...
-+                return StarLightInterface.this.hasUpdates();
-+            }
-+
-+            @Override
-+            public int runLightUpdates() {
-+                throw new UnsupportedOperationException();
-+            }
-+
-+            @Override
-+            public void setLightEnabled(final ChunkPos chunkPos, final boolean bl) {
-+                throw new UnsupportedOperationException();
-+            }
-+
-+            @Override
-+            public DataLayer getDataLayerData(final SectionPos pos) {
-+                final ChunkAccess chunk = StarLightInterface.this.getAnyChunkNow(pos.getX(), pos.getZ());
-+                if (chunk == null || (!StarLightInterface.this.isClientSide && !chunk.isLightCorrect()) || !chunk.getStatus().isOrAfter(ChunkStatus.LIGHT)) {
-+                    return null;
-+                }
-+
-+                final int sectionY = pos.getY();
-+
-+                if (sectionY > StarLightInterface.this.maxLightSection || sectionY < StarLightInterface.this.minLightSection) {
-+                    return null;
-+                }
-+
-+                if (chunk.getSkyEmptinessMap() == null) {
-+                    return null;
-+                }
-+
-+                return chunk.getSkyNibbles()[sectionY - StarLightInterface.this.minLightSection].toVanillaNibble();
-+            }
-+
-+            @Override
-+            public int getLightValue(final BlockPos blockPos) {
-+                return StarLightInterface.this.getSkyLightValue(blockPos, StarLightInterface.this.getAnyChunkNow(blockPos.getX() >> 4, blockPos.getZ() >> 4));
-+            }
-+
-+            @Override
-+            public void updateSectionStatus(final SectionPos pos, final boolean notReady) {
-+                StarLightInterface.this.sectionChange(pos, notReady);
-+            }
-+        };
-+        this.blockReader = !hasBlockLight ? LayerLightEventListener.DummyLightLayerEventListener.INSTANCE : new LayerLightEventListener() {
-+            @Override
-+            public void checkBlock(final BlockPos blockPos) {
-+                StarLightInterface.this.lightEngine.checkBlock(blockPos.immutable());
-+            }
-+
-+            @Override
-+            public void propagateLightSources(final ChunkPos chunkPos) {
-+                throw new UnsupportedOperationException();
-+            }
-+
-+            @Override
-+            public boolean hasLightWork() {
-+                // not really correct...
-+                return StarLightInterface.this.hasUpdates();
-+            }
-+
-+            @Override
-+            public int runLightUpdates() {
-+                throw new UnsupportedOperationException();
-+            }
-+
-+            @Override
-+            public void setLightEnabled(final ChunkPos chunkPos, final boolean bl) {
-+                throw new UnsupportedOperationException();
-+            }
-+
-+            @Override
-+            public DataLayer getDataLayerData(final SectionPos pos) {
-+                final ChunkAccess chunk = StarLightInterface.this.getAnyChunkNow(pos.getX(), pos.getZ());
-+
-+                if (chunk == null || pos.getY() < StarLightInterface.this.minLightSection || pos.getY() > StarLightInterface.this.maxLightSection) {
-+                    return null;
-+                }
-+
-+                return chunk.getBlockNibbles()[pos.getY() - StarLightInterface.this.minLightSection].toVanillaNibble();
-+            }
-+
-+            @Override
-+            public int getLightValue(final BlockPos blockPos) {
-+                return StarLightInterface.this.getBlockLightValue(blockPos, StarLightInterface.this.getAnyChunkNow(blockPos.getX() >> 4, blockPos.getZ() >> 4));
-+            }
-+
-+            @Override
-+            public void updateSectionStatus(final SectionPos pos, final boolean notReady) {
-+                StarLightInterface.this.sectionChange(pos, notReady);
-+            }
-+        };
-+    }
-+
-+    public boolean hasSkyLight() {
-+        return this.hasSkyLight;
-+    }
-+
-+    public boolean hasBlockLight() {
-+        return this.hasBlockLight;
-+    }
-+
-+    public int getSkyLightValue(final BlockPos blockPos, final ChunkAccess chunk) {
-+        if (!this.hasSkyLight) {
-+            return 0;
-+        }
-+        final int x = blockPos.getX();
-+        int y = blockPos.getY();
-+        final int z = blockPos.getZ();
-+
-+        final int minSection = this.minSection;
-+        final int maxSection = this.maxSection;
-+        final int minLightSection = this.minLightSection;
-+        final int maxLightSection = this.maxLightSection;
-+
-+        if (chunk == null || (!this.isClientSide && !chunk.isLightCorrect()) || !chunk.getStatus().isOrAfter(ChunkStatus.LIGHT)) {
-+            return 15;
-+        }
-+
-+        int sectionY = y >> 4;
-+
-+        if (sectionY > maxLightSection) {
-+            return 15;
-+        }
-+
-+        if (sectionY < minLightSection) {
-+            sectionY = minLightSection;
-+            y = sectionY << 4;
-+        }
-+
-+        final SWMRNibbleArray[] nibbles = chunk.getSkyNibbles();
-+        final SWMRNibbleArray immediate = nibbles[sectionY - minLightSection];
-+
-+        if (!immediate.isNullNibbleVisible()) {
-+            return immediate.getVisible(x, y, z);
-+        }
-+
-+        final boolean[] emptinessMap = chunk.getSkyEmptinessMap();
-+
-+        if (emptinessMap == null) {
-+            return 15;
-+        }
-+
-+        // are we above this chunk's lowest empty section?
-+        int lowestY = minLightSection - 1;
-+        for (int currY = maxSection; currY >= minSection; --currY) {
-+            if (emptinessMap[currY - minSection]) {
-+                continue;
-+            }
-+
-+            // should always be full lit here
-+            lowestY = currY;
-+            break;
-+        }
-+
-+        if (sectionY > lowestY) {
-+            return 15;
-+        }
-+
-+        // this nibble is going to depend solely on the skylight data above it
-+        // find first non-null data above (there does exist one, as we just found it above)
-+        for (int currY = sectionY + 1; currY <= maxLightSection; ++currY) {
-+            final SWMRNibbleArray nibble = nibbles[currY - minLightSection];
-+            if (!nibble.isNullNibbleVisible()) {
-+                return nibble.getVisible(x, 0, z);
-+            }
-+        }
-+
-+        // should never reach here
-+        return 15;
-+    }
-+
-+    public int getBlockLightValue(final BlockPos blockPos, final ChunkAccess chunk) {
-+        if (!this.hasBlockLight) {
-+            return 0;
-+        }
-+        final int y = blockPos.getY();
-+        final int cy = y >> 4;
-+
-+        final int minLightSection = this.minLightSection;
-+        final int maxLightSection = this.maxLightSection;
-+
-+        if (cy < minLightSection || cy > maxLightSection) {
-+            return 0;
-+        }
-+
-+        if (chunk == null) {
-+            return 0;
-+        }
-+
-+        final SWMRNibbleArray nibble = chunk.getBlockNibbles()[cy - minLightSection];
-+        return nibble.getVisible(blockPos.getX(), y, blockPos.getZ());
-+    }
-+
-+    public int getRawBrightness(final BlockPos pos, final int ambientDarkness) {
-+        final ChunkAccess chunk = this.getAnyChunkNow(pos.getX() >> 4, pos.getZ() >> 4);
-+
-+        final int sky = this.getSkyLightValue(pos, chunk) - ambientDarkness;
-+        // Don't fetch the block light level if the skylight level is 15, since the value will never be higher.
-+        if (sky == 15) return 15;
-+        final int block = this.getBlockLightValue(pos, chunk);
-+        return Math.max(sky, block);
-+    }
-+
-+    public LayerLightEventListener getSkyReader() {
-+        return this.skyReader;
-+    }
-+
-+    public LayerLightEventListener getBlockReader() {
-+        return this.blockReader;
-+    }
-+
-+    public boolean isClientSide() {
-+        return this.isClientSide;
-+    }
-+
-+    public ChunkAccess getAnyChunkNow(final int chunkX, final int chunkZ) {
-+        if (this.world == null) {
-+            // empty world
-+            return null;
-+        }
-+
-+        final ServerChunkCache chunkProvider =  ((ServerLevel)this.world).getChunkSource();
-+        final LevelChunk fullLoaded = chunkProvider.getChunkAtIfLoadedImmediately(chunkX, chunkZ);
-+        if (fullLoaded != null) {
-+            return fullLoaded;
-+        }
-+
-+        return chunkProvider.getChunkAtImmediately(chunkX, chunkZ);
-+    }
-+
-+    public boolean hasUpdates() {
-+        return !this.lightQueue.isEmpty();
-+    }
-+
-+    public Level getWorld() {
-+        return this.world;
-+    }
-+
-+    public LightChunkGetter getLightAccess() {
-+        return this.lightAccess;
-+    }
-+
-+    protected final SkyStarLightEngine getSkyLightEngine() {
-+        if (this.cachedSkyPropagators == null) {
-+            return null;
-+        }
-+        final SkyStarLightEngine ret;
-+        synchronized (this.cachedSkyPropagators) {
-+            ret = this.cachedSkyPropagators.pollFirst();
-+        }
-+
-+        if (ret == null) {
-+            return new SkyStarLightEngine(this.world);
-+        }
-+        return ret;
-+    }
-+
-+    protected final void releaseSkyLightEngine(final SkyStarLightEngine engine) {
-+        if (this.cachedSkyPropagators == null) {
-+            return;
-+        }
-+        synchronized (this.cachedSkyPropagators) {
-+            this.cachedSkyPropagators.addFirst(engine);
-+        }
-+    }
-+
-+    protected final BlockStarLightEngine getBlockLightEngine() {
-+        if (this.cachedBlockPropagators == null) {
-+            return null;
-+        }
-+        final BlockStarLightEngine ret;
-+        synchronized (this.cachedBlockPropagators) {
-+            ret = this.cachedBlockPropagators.pollFirst();
-+        }
-+
-+        if (ret == null) {
-+            return new BlockStarLightEngine(this.world);
-+        }
-+        return ret;
-+    }
-+
-+    protected final void releaseBlockLightEngine(final BlockStarLightEngine engine) {
-+        if (this.cachedBlockPropagators == null) {
-+            return;
-+        }
-+        synchronized (this.cachedBlockPropagators) {
-+            this.cachedBlockPropagators.addFirst(engine);
-+        }
-+    }
-+
-+    public LightQueue.ChunkTasks blockChange(final BlockPos pos) {
-+        if (this.world == null || pos.getY() < WorldUtil.getMinBlockY(this.world) || pos.getY() > WorldUtil.getMaxBlockY(this.world)) { // empty world
-+            return null;
-+        }
-+
-+        return this.lightQueue.queueBlockChange(pos);
-+    }
-+
-+    public LightQueue.ChunkTasks sectionChange(final SectionPos pos, final boolean newEmptyValue) {
-+        if (this.world == null) { // empty world
-+            return null;
-+        }
-+
-+        return this.lightQueue.queueSectionChange(pos, newEmptyValue);
-+    }
-+
-+    public void forceLoadInChunk(final ChunkAccess chunk, final Boolean[] emptySections) {
-+        final SkyStarLightEngine skyEngine = this.getSkyLightEngine();
-+        final BlockStarLightEngine blockEngine = this.getBlockLightEngine();
-+
-+        try {
-+            if (skyEngine != null) {
-+                skyEngine.forceHandleEmptySectionChanges(this.lightAccess, chunk, emptySections);
-+            }
-+            if (blockEngine != null) {
-+                blockEngine.forceHandleEmptySectionChanges(this.lightAccess, chunk, emptySections);
-+            }
-+        } finally {
-+            this.releaseSkyLightEngine(skyEngine);
-+            this.releaseBlockLightEngine(blockEngine);
-+        }
-+    }
-+
-+    public void loadInChunk(final int chunkX, final int chunkZ, final Boolean[] emptySections) {
-+        final SkyStarLightEngine skyEngine = this.getSkyLightEngine();
-+        final BlockStarLightEngine blockEngine = this.getBlockLightEngine();
-+
-+        try {
-+            if (skyEngine != null) {
-+                skyEngine.handleEmptySectionChanges(this.lightAccess, chunkX, chunkZ, emptySections);
-+            }
-+            if (blockEngine != null) {
-+                blockEngine.handleEmptySectionChanges(this.lightAccess, chunkX, chunkZ, emptySections);
-+            }
-+        } finally {
-+            this.releaseSkyLightEngine(skyEngine);
-+            this.releaseBlockLightEngine(blockEngine);
-+        }
-+    }
-+
-+    public void lightChunk(final ChunkAccess chunk, final Boolean[] emptySections) {
-+        final SkyStarLightEngine skyEngine = this.getSkyLightEngine();
-+        final BlockStarLightEngine blockEngine = this.getBlockLightEngine();
-+
-+        try {
-+            if (skyEngine != null) {
-+                skyEngine.light(this.lightAccess, chunk, emptySections);
-+            }
-+            if (blockEngine != null) {
-+                blockEngine.light(this.lightAccess, chunk, emptySections);
-+            }
-+        } finally {
-+            this.releaseSkyLightEngine(skyEngine);
-+            this.releaseBlockLightEngine(blockEngine);
-+        }
-+    }
-+
-+    public void relightChunks(final Set<ChunkPos> chunks, final Consumer<ChunkPos> chunkLightCallback,
-+                              final IntConsumer onComplete) {
-+        final SkyStarLightEngine skyEngine = this.getSkyLightEngine();
-+        final BlockStarLightEngine blockEngine = this.getBlockLightEngine();
-+
-+        try {
-+            if (skyEngine != null) {
-+                skyEngine.relightChunks(this.lightAccess, chunks, blockEngine == null ? chunkLightCallback : null,
-+                        blockEngine == null ? onComplete : null);
-+            }
-+            if (blockEngine != null) {
-+                blockEngine.relightChunks(this.lightAccess, chunks, chunkLightCallback, onComplete);
-+            }
-+        } finally {
-+            this.releaseSkyLightEngine(skyEngine);
-+            this.releaseBlockLightEngine(blockEngine);
-+        }
-+    }
-+
-+    public void checkChunkEdges(final int chunkX, final int chunkZ) {
-+        this.checkSkyEdges(chunkX, chunkZ);
-+        this.checkBlockEdges(chunkX, chunkZ);
-+    }
-+
-+    public void checkSkyEdges(final int chunkX, final int chunkZ) {
-+        final SkyStarLightEngine skyEngine = this.getSkyLightEngine();
-+
-+        try {
-+            if (skyEngine != null) {
-+                skyEngine.checkChunkEdges(this.lightAccess, chunkX, chunkZ);
-+            }
-+        } finally {
-+            this.releaseSkyLightEngine(skyEngine);
-+        }
-+    }
-+
-+    public void checkBlockEdges(final int chunkX, final int chunkZ) {
-+        final BlockStarLightEngine blockEngine = this.getBlockLightEngine();
-+        try {
-+            if (blockEngine != null) {
-+                blockEngine.checkChunkEdges(this.lightAccess, chunkX, chunkZ);
-+            }
-+        } finally {
-+            this.releaseBlockLightEngine(blockEngine);
-+        }
-+    }
-+
-+    public void checkSkyEdges(final int chunkX, final int chunkZ, final ShortCollection sections) {
-+        final SkyStarLightEngine skyEngine = this.getSkyLightEngine();
-+
-+        try {
-+            if (skyEngine != null) {
-+                skyEngine.checkChunkEdges(this.lightAccess, chunkX, chunkZ, sections);
-+            }
-+        } finally {
-+            this.releaseSkyLightEngine(skyEngine);
-+        }
-+    }
-+
-+    public void checkBlockEdges(final int chunkX, final int chunkZ, final ShortCollection sections) {
-+        final BlockStarLightEngine blockEngine = this.getBlockLightEngine();
-+        try {
-+            if (blockEngine != null) {
-+                blockEngine.checkChunkEdges(this.lightAccess, chunkX, chunkZ, sections);
-+            }
-+        } finally {
-+            this.releaseBlockLightEngine(blockEngine);
-+        }
-+    }
-+
-+    public void scheduleChunkLight(final ChunkPos pos, final Runnable run) {
-+        this.lightQueue.queueChunkLighting(pos, run);
-+    }
-+
-+    public void removeChunkTasks(final ChunkPos pos) {
-+        this.lightQueue.removeChunk(pos);
-+    }
-+
-+    public void propagateChanges() {
-+        if (this.lightQueue.isEmpty()) {
-+            return;
-+        }
-+
-+        final SkyStarLightEngine skyEngine = this.getSkyLightEngine();
-+        final BlockStarLightEngine blockEngine = this.getBlockLightEngine();
-+
-+        try {
-+            LightQueue.ChunkTasks task;
-+            while ((task = this.lightQueue.removeFirstTask()) != null) {
-+                if (task.lightTasks != null) {
-+                    for (final Runnable run : task.lightTasks) {
-+                        run.run();
-+                    }
-+                }
-+
-+                final long coordinate = task.chunkCoordinate;
-+                final int chunkX = CoordinateUtils.getChunkX(coordinate);
-+                final int chunkZ = CoordinateUtils.getChunkZ(coordinate);
-+
-+                final Set<BlockPos> positions = task.changedPositions;
-+                final Boolean[] sectionChanges = task.changedSectionSet;
-+
-+                if (skyEngine != null && (!positions.isEmpty() || sectionChanges != null)) {
-+                    skyEngine.blocksChangedInChunk(this.lightAccess, chunkX, chunkZ, positions, sectionChanges);
-+                }
-+                if (blockEngine != null && (!positions.isEmpty() || sectionChanges != null)) {
-+                    blockEngine.blocksChangedInChunk(this.lightAccess, chunkX, chunkZ, positions, sectionChanges);
-+                }
-+
-+                if (skyEngine != null && task.queuedEdgeChecksSky != null) {
-+                    skyEngine.checkChunkEdges(this.lightAccess, chunkX, chunkZ, task.queuedEdgeChecksSky);
-+                }
-+                if (blockEngine != null && task.queuedEdgeChecksBlock != null) {
-+                    blockEngine.checkChunkEdges(this.lightAccess, chunkX, chunkZ, task.queuedEdgeChecksBlock);
-+                }
-+
-+                task.onComplete.complete(null);
-+            }
-+        } finally {
-+            this.releaseSkyLightEngine(skyEngine);
-+            this.releaseBlockLightEngine(blockEngine);
-+        }
-+    }
-+
-+    public static final class LightQueue {
-+
-+        protected final Long2ObjectLinkedOpenHashMap<ChunkTasks> chunkTasks = new Long2ObjectLinkedOpenHashMap<>();
-+        protected final StarLightInterface manager;
-+
-+        public LightQueue(final StarLightInterface manager) {
-+            this.manager = manager;
-+        }
-+
-+        public synchronized boolean isEmpty() {
-+            return this.chunkTasks.isEmpty();
-+        }
-+
-+        public synchronized LightQueue.ChunkTasks queueBlockChange(final BlockPos pos) {
-+            final ChunkTasks tasks = this.chunkTasks.computeIfAbsent(CoordinateUtils.getChunkKey(pos), ChunkTasks::new);
-+            tasks.changedPositions.add(pos.immutable());
-+            return tasks;
-+        }
-+
-+        public synchronized LightQueue.ChunkTasks queueSectionChange(final SectionPos pos, final boolean newEmptyValue) {
-+            final ChunkTasks tasks = this.chunkTasks.computeIfAbsent(CoordinateUtils.getChunkKey(pos), ChunkTasks::new);
-+
-+            if (tasks.changedSectionSet == null) {
-+                tasks.changedSectionSet = new Boolean[this.manager.maxSection - this.manager.minSection + 1];
-+            }
-+            tasks.changedSectionSet[pos.getY() - this.manager.minSection] = Boolean.valueOf(newEmptyValue);
-+
-+            return tasks;
-+        }
-+
-+        public synchronized LightQueue.ChunkTasks queueChunkLighting(final ChunkPos pos, final Runnable lightTask) {
-+            final ChunkTasks tasks = this.chunkTasks.computeIfAbsent(CoordinateUtils.getChunkKey(pos), ChunkTasks::new);
-+            if (tasks.lightTasks == null) {
-+                tasks.lightTasks = new ArrayList<>();
-+            }
-+            tasks.lightTasks.add(lightTask);
-+
-+            return tasks;
-+        }
-+
-+        public synchronized LightQueue.ChunkTasks queueChunkSkylightEdgeCheck(final SectionPos pos, final ShortCollection sections) {
-+            final ChunkTasks tasks = this.chunkTasks.computeIfAbsent(CoordinateUtils.getChunkKey(pos), ChunkTasks::new);
-+
-+            ShortOpenHashSet queuedEdges = tasks.queuedEdgeChecksSky;
-+            if (queuedEdges == null) {
-+                queuedEdges = tasks.queuedEdgeChecksSky = new ShortOpenHashSet();
-+            }
-+            queuedEdges.addAll(sections);
-+
-+            return tasks;
-+        }
-+
-+        public synchronized LightQueue.ChunkTasks queueChunkBlocklightEdgeCheck(final SectionPos pos, final ShortCollection sections) {
-+            final ChunkTasks tasks = this.chunkTasks.computeIfAbsent(CoordinateUtils.getChunkKey(pos), ChunkTasks::new);
-+
-+            ShortOpenHashSet queuedEdges = tasks.queuedEdgeChecksBlock;
-+            if (queuedEdges == null) {
-+                queuedEdges = tasks.queuedEdgeChecksBlock = new ShortOpenHashSet();
-+            }
-+            queuedEdges.addAll(sections);
-+
-+            return tasks;
-+        }
-+
-+        public void removeChunk(final ChunkPos pos) {
-+            final ChunkTasks tasks;
-+            synchronized (this) {
-+                tasks = this.chunkTasks.remove(CoordinateUtils.getChunkKey(pos));
-+            }
-+            if (tasks != null) {
-+                tasks.onComplete.complete(null);
-+            }
-+        }
-+
-+        public synchronized ChunkTasks removeFirstTask() {
-+            if (this.chunkTasks.isEmpty()) {
-+                return null;
-+            }
-+            return this.chunkTasks.removeFirst();
-+        }
-+
-+        public static final class ChunkTasks {
-+
-+            public final Set<BlockPos> changedPositions = new ObjectOpenHashSet<>();
-+            public Boolean[] changedSectionSet;
-+            public ShortOpenHashSet queuedEdgeChecksSky;
-+            public ShortOpenHashSet queuedEdgeChecksBlock;
-+            public List<Runnable> lightTasks;
-+
-+            public boolean isTicketAdded = false;
-+            public final CompletableFuture<Void> onComplete = new CompletableFuture<>();
-+
-+            public final long chunkCoordinate;
-+
-+            public ChunkTasks(final long chunkCoordinate) {
-+                this.chunkCoordinate = chunkCoordinate;
-+            }
-+        }
-+    }
-+}
-diff --git a/src/main/java/ca/spottedleaf/starlight/common/util/CoordinateUtils.java b/src/main/java/ca/spottedleaf/starlight/common/util/CoordinateUtils.java
-new file mode 100644
-index 0000000000000000000000000000000000000000..16a4a14e7ccf9e4d7fdf1166674fe8f529c06d39
---- /dev/null
-+++ b/src/main/java/ca/spottedleaf/starlight/common/util/CoordinateUtils.java
-@@ -0,0 +1,128 @@
-+package ca.spottedleaf.starlight.common.util;
-+
-+import net.minecraft.core.BlockPos;
-+import net.minecraft.core.SectionPos;
-+import net.minecraft.util.Mth;
-+import net.minecraft.world.entity.Entity;
-+import net.minecraft.world.level.ChunkPos;
-+
-+public final class CoordinateUtils {
-+
-+    // dx, dz are relative to the target chunk
-+    // dx, dz in [-radius, radius]
-+    public static int getNeighbourMappedIndex(final int dx, final int dz, final int radius) {
-+        return (dx + radius) + (2 * radius + 1)*(dz + radius);
-+    }
-+
-+    // the chunk keys are compatible with vanilla
-+
-+    public static long getChunkKey(final BlockPos pos) {
-+        return ((long)(pos.getZ() >> 4) << 32) | ((pos.getX() >> 4) & 0xFFFFFFFFL);
-+    }
-+
-+    public static long getChunkKey(final Entity entity) {
-+        return ((long)(Mth.floor(entity.getZ()) >> 4) << 32) | ((Mth.floor(entity.getX()) >> 4) & 0xFFFFFFFFL);
-+    }
-+
-+    public static long getChunkKey(final ChunkPos pos) {
-+        return ((long)pos.z << 32) | (pos.x & 0xFFFFFFFFL);
-+    }
-+
-+    public static long getChunkKey(final SectionPos pos) {
-+        return ((long)pos.getZ() << 32) | (pos.getX() & 0xFFFFFFFFL);
-+    }
-+
-+    public static long getChunkKey(final int x, final int z) {
-+        return ((long)z << 32) | (x & 0xFFFFFFFFL);
-+    }
-+
-+    public static int getChunkX(final long chunkKey) {
-+        return (int)chunkKey;
-+    }
-+
-+    public static int getChunkZ(final long chunkKey) {
-+        return (int)(chunkKey >>> 32);
-+    }
-+
-+    public static int getChunkCoordinate(final double blockCoordinate) {
-+        return Mth.floor(blockCoordinate) >> 4;
-+    }
-+
-+    // the section keys are compatible with vanilla's
-+
-+    static final int SECTION_X_BITS = 22;
-+    static final long SECTION_X_MASK = (1L << SECTION_X_BITS) - 1;
-+    static final int SECTION_Y_BITS = 20;
-+    static final long SECTION_Y_MASK = (1L << SECTION_Y_BITS) - 1;
-+    static final int SECTION_Z_BITS = 22;
-+    static final long SECTION_Z_MASK = (1L << SECTION_Z_BITS) - 1;
-+    // format is y,z,x (in order of LSB to MSB)
-+    static final int SECTION_Y_SHIFT = 0;
-+    static final int SECTION_Z_SHIFT = SECTION_Y_SHIFT + SECTION_Y_BITS;
-+    static final int SECTION_X_SHIFT = SECTION_Z_SHIFT + SECTION_X_BITS;
-+    static final int SECTION_TO_BLOCK_SHIFT = 4;
-+
-+    public static long getChunkSectionKey(final int x, final int y, final int z) {
-+        return ((x & SECTION_X_MASK) << SECTION_X_SHIFT)
-+                | ((y & SECTION_Y_MASK) << SECTION_Y_SHIFT)
-+                | ((z & SECTION_Z_MASK) << SECTION_Z_SHIFT);
-+    }
-+
-+    public static long getChunkSectionKey(final SectionPos pos) {
-+        return ((pos.getX() & SECTION_X_MASK) << SECTION_X_SHIFT)
-+                | ((pos.getY() & SECTION_Y_MASK) << SECTION_Y_SHIFT)
-+                | ((pos.getZ() & SECTION_Z_MASK) << SECTION_Z_SHIFT);
-+    }
-+
-+    public static long getChunkSectionKey(final ChunkPos pos, final int y) {
-+        return ((pos.x & SECTION_X_MASK) << SECTION_X_SHIFT)
-+                | ((y & SECTION_Y_MASK) << SECTION_Y_SHIFT)
-+                | ((pos.z & SECTION_Z_MASK) << SECTION_Z_SHIFT);
-+    }
-+
-+    public static long getChunkSectionKey(final BlockPos pos) {
-+        return (((long)pos.getX() << (SECTION_X_SHIFT - SECTION_TO_BLOCK_SHIFT)) & (SECTION_X_MASK << SECTION_X_SHIFT)) |
-+                ((pos.getY() >> SECTION_TO_BLOCK_SHIFT) & (SECTION_Y_MASK << SECTION_Y_SHIFT)) |
-+                (((long)pos.getZ() << (SECTION_Z_SHIFT - SECTION_TO_BLOCK_SHIFT)) & (SECTION_Z_MASK << SECTION_Z_SHIFT));
-+    }
-+
-+    public static long getChunkSectionKey(final Entity entity) {
-+        return ((Mth.lfloor(entity.getX()) << (SECTION_X_SHIFT - SECTION_TO_BLOCK_SHIFT)) & (SECTION_X_MASK << SECTION_X_SHIFT)) |
-+                ((Mth.lfloor(entity.getY()) >> SECTION_TO_BLOCK_SHIFT) & (SECTION_Y_MASK << SECTION_Y_SHIFT)) |
-+                ((Mth.lfloor(entity.getZ()) << (SECTION_Z_SHIFT - SECTION_TO_BLOCK_SHIFT)) & (SECTION_Z_MASK << SECTION_Z_SHIFT));
-+    }
-+
-+    public static int getChunkSectionX(final long key) {
-+        return (int)(key << (Long.SIZE - (SECTION_X_SHIFT + SECTION_X_BITS)) >> (Long.SIZE - SECTION_X_BITS));
-+    }
-+
-+    public static int getChunkSectionY(final long key) {
-+        return (int)(key << (Long.SIZE - (SECTION_Y_SHIFT + SECTION_Y_BITS)) >> (Long.SIZE - SECTION_Y_BITS));
-+    }
-+
-+    public static int getChunkSectionZ(final long key) {
-+        return (int)(key << (Long.SIZE - (SECTION_Z_SHIFT + SECTION_Z_BITS)) >> (Long.SIZE - SECTION_Z_BITS));
-+    }
-+
-+    // the block coordinates are not necessarily compatible with vanilla's
-+
-+    public static int getBlockCoordinate(final double blockCoordinate) {
-+        return Mth.floor(blockCoordinate);
-+    }
-+
-+    public static long getBlockKey(final int x, final int y, final int z) {
-+        return ((long)x & 0x7FFFFFF) | (((long)z & 0x7FFFFFF) << 27) | ((long)y << 54);
-+    }
-+
-+    public static long getBlockKey(final BlockPos pos) {
-+        return ((long)pos.getX() & 0x7FFFFFF) | (((long)pos.getZ() & 0x7FFFFFF) << 27) | ((long)pos.getY() << 54);
-+    }
-+
-+    public static long getBlockKey(final Entity entity) {
-+        return ((long)entity.getX() & 0x7FFFFFF) | (((long)entity.getZ() & 0x7FFFFFF) << 27) | ((long)entity.getY() << 54);
-+    }
-+
-+    private CoordinateUtils() {
-+        throw new RuntimeException();
-+    }
-+}
-diff --git a/src/main/java/ca/spottedleaf/starlight/common/util/IntegerUtil.java b/src/main/java/ca/spottedleaf/starlight/common/util/IntegerUtil.java
-new file mode 100644
-index 0000000000000000000000000000000000000000..fabf1e97c019c7365212f40018dcd08d3b828113
---- /dev/null
-+++ b/src/main/java/ca/spottedleaf/starlight/common/util/IntegerUtil.java
-@@ -0,0 +1,242 @@
-+package ca.spottedleaf.starlight.common.util;
-+
-+public final class IntegerUtil {
-+
-+    public static final int HIGH_BIT_U32 = Integer.MIN_VALUE;
-+    public static final long HIGH_BIT_U64 = Long.MIN_VALUE;
-+
-+    public static int ceilLog2(final int value) {
-+        return Integer.SIZE - Integer.numberOfLeadingZeros(value - 1); // see doc of numberOfLeadingZeros
-+    }
-+
-+    public static long ceilLog2(final long value) {
-+        return Long.SIZE - Long.numberOfLeadingZeros(value - 1); // see doc of numberOfLeadingZeros
-+    }
-+
-+    public static int floorLog2(final int value) {
-+        // xor is optimized subtract for 2^n -1
-+        // note that (2^n -1) - k = (2^n -1) ^ k for k <= (2^n - 1)
-+        return (Integer.SIZE - 1) ^ Integer.numberOfLeadingZeros(value); // see doc of numberOfLeadingZeros
-+    }
-+
-+    public static int floorLog2(final long value) {
-+        // xor is optimized subtract for 2^n -1
-+        // note that (2^n -1) - k = (2^n -1) ^ k for k <= (2^n - 1)
-+        return (Long.SIZE - 1) ^ Long.numberOfLeadingZeros(value); // see doc of numberOfLeadingZeros
-+    }
-+
-+    public static int roundCeilLog2(final int value) {
-+        // optimized variant of 1 << (32 - leading(val - 1))
-+        // given
-+        // 1 << n = HIGH_BIT_32 >>> (31 - n) for n [0, 32)
-+        // 1 << (32 - leading(val - 1)) = HIGH_BIT_32 >>> (31 - (32 - leading(val - 1)))
-+        // HIGH_BIT_32 >>> (31 - (32 - leading(val - 1)))
-+        // HIGH_BIT_32 >>> (31 - 32 + leading(val - 1))
-+        // HIGH_BIT_32 >>> (-1 + leading(val - 1))
-+        return HIGH_BIT_U32 >>> (Integer.numberOfLeadingZeros(value - 1) - 1);
-+    }
-+
-+    public static long roundCeilLog2(final long value) {
-+        // see logic documented above
-+        return HIGH_BIT_U64 >>> (Long.numberOfLeadingZeros(value - 1) - 1);
-+    }
-+
-+    public static int roundFloorLog2(final int value) {
-+        // optimized variant of 1 << (31 - leading(val))
-+        // given
-+        // 1 << n = HIGH_BIT_32 >>> (31 - n) for n [0, 32)
-+        // 1 << (31 - leading(val)) = HIGH_BIT_32 >> (31 - (31 - leading(val)))
-+        // HIGH_BIT_32 >> (31 - (31 - leading(val)))
-+        // HIGH_BIT_32 >> (31 - 31 + leading(val))
-+        return HIGH_BIT_U32 >>> Integer.numberOfLeadingZeros(value);
-+    }
-+
-+    public static long roundFloorLog2(final long value) {
-+        // see logic documented above
-+        return HIGH_BIT_U64 >>> Long.numberOfLeadingZeros(value);
-+    }
-+
-+    public static boolean isPowerOfTwo(final int n) {
-+        // 2^n has one bit
-+        // note: this rets true for 0 still
-+        return IntegerUtil.getTrailingBit(n) == n;
-+    }
-+
-+    public static boolean isPowerOfTwo(final long n) {
-+        // 2^n has one bit
-+        // note: this rets true for 0 still
-+        return IntegerUtil.getTrailingBit(n) == n;
-+    }
-+
-+    public static int getTrailingBit(final int n) {
-+        return -n & n;
-+    }
-+
-+    public static long getTrailingBit(final long n) {
-+        return -n & n;
-+    }
-+
-+    public static int trailingZeros(final int n) {
-+        return Integer.numberOfTrailingZeros(n);
-+    }
-+
-+    public static int trailingZeros(final long n) {
-+        return Long.numberOfTrailingZeros(n);
-+    }
-+
-+    // from hacker's delight (signed division magic value)
-+    public static int getDivisorMultiple(final long numbers) {
-+        return (int)(numbers >>> 32);
-+    }
-+
-+    // from hacker's delight (signed division magic value)
-+    public static int getDivisorShift(final long numbers) {
-+        return (int)numbers;
-+    }
-+
-+    // copied from hacker's delight (signed division magic value)
-+    // http://www.hackersdelight.org/hdcodetxt/magic.c.txt
-+    public static long getDivisorNumbers(final int d) {
-+        final int ad = branchlessAbs(d);
-+
-+        if (ad < 2) {
-+            throw new IllegalArgumentException("|number| must be in [2, 2^31 -1], not: " + d);
-+        }
-+
-+        final int two31 = 0x80000000;
-+        final long mask = 0xFFFFFFFFL; // mask for enforcing unsigned behaviour
-+
-+        /*
-+         Signed usage:
-+         int number;
-+         long magic = getDivisorNumbers(div);
-+         long mul = magic >>> 32;
-+         int sign = number >> 31;
-+         int result = (int)(((long)number * mul) >>> magic) - sign;
-+         */
-+        /*
-+         Unsigned usage:
-+         int number;
-+         long magic = getDivisorNumbers(div);
-+         long mul = magic >>> 32;
-+         int result = (int)(((long)number * mul) >>> magic);
-+         */
-+
-+        int p = 31;
-+
-+        // all these variables are UNSIGNED!
-+        int t = two31 + (d >>> 31);
-+        int anc = t - 1 - (int)((t & mask)%ad);
-+        int q1 = (int)((two31 & mask)/(anc & mask));
-+        int r1 = two31 - q1*anc;
-+        int q2 = (int)((two31 & mask)/(ad & mask));
-+        int r2 = two31 - q2*ad;
-+        int delta;
-+
-+        do {
-+            p = p + 1;
-+            q1 = 2*q1;                        // Update q1 = 2**p/|nc|.
-+            r1 = 2*r1;                        // Update r1 = rem(2**p, |nc|).
-+            if ((r1 & mask) >= (anc & mask)) {// (Must be an unsigned comparison here)
-+                q1 = q1 + 1;
-+                r1 = r1 - anc;
-+            }
-+            q2 = 2*q2;                       // Update q2 = 2**p/|d|.
-+            r2 = 2*r2;                       // Update r2 = rem(2**p, |d|).
-+            if ((r2 & mask) >= (ad & mask)) {// (Must be an unsigned comparison here)
-+                q2 = q2 + 1;
-+                r2 = r2 - ad;
-+            }
-+            delta = ad - r2;
-+        } while ((q1 & mask) < (delta & mask) || (q1 == delta && r1 == 0));
-+
-+        int magicNum = q2 + 1;
-+        if (d < 0) {
-+            magicNum = -magicNum;
-+        }
-+        int shift = p;
-+        return ((long)magicNum << 32) | shift;
-+    }
-+
-+    public static int branchlessAbs(final int val) {
-+        // -n = -1 ^ n + 1
-+        final int mask = val >> (Integer.SIZE - 1); // -1 if < 0, 0 if >= 0
-+        return (mask ^ val) - mask; // if val < 0, then (0 ^ val) - 0 else (-1 ^ val) + 1
-+    }
-+
-+    public static long branchlessAbs(final long val) {
-+        // -n = -1 ^ n + 1
-+        final long mask = val >> (Long.SIZE - 1); // -1 if < 0, 0 if >= 0
-+        return (mask ^ val) - mask; // if val < 0, then (0 ^ val) - 0 else (-1 ^ val) + 1
-+    }
-+
-+    //https://github.com/skeeto/hash-prospector for hash functions
-+
-+    //score = ~590.47984224483832
-+    public static int hash0(int x) {
-+        x *= 0x36935555;
-+        x ^= x >>> 16;
-+        return x;
-+    }
-+
-+    //score = ~310.01596637036749
-+    public static int hash1(int x) {
-+        x ^= x >>> 15;
-+        x *= 0x356aaaad;
-+        x ^= x >>> 17;
-+        return x;
-+    }
-+
-+    public static int hash2(int x) {
-+        x ^= x >>> 16;
-+        x *= 0x7feb352d;
-+        x ^= x >>> 15;
-+        x *= 0x846ca68b;
-+        x ^= x >>> 16;
-+        return x;
-+    }
-+
-+    public static int hash3(int x) {
-+        x ^= x >>> 17;
-+        x *= 0xed5ad4bb;
-+        x ^= x >>> 11;
-+        x *= 0xac4c1b51;
-+        x ^= x >>> 15;
-+        x *= 0x31848bab;
-+        x ^= x >>> 14;
-+        return x;
-+    }
-+
-+    //score = ~365.79959673201887
-+    public static long hash1(long x) {
-+        x ^= x >>> 27;
-+        x *= 0xb24924b71d2d354bL;
-+        x ^= x >>> 28;
-+        return x;
-+    }
-+
-+    //h2 hash
-+    public static long hash2(long x) {
-+        x ^= x >>> 32;
-+        x *= 0xd6e8feb86659fd93L;
-+        x ^= x >>> 32;
-+        x *= 0xd6e8feb86659fd93L;
-+        x ^= x >>> 32;
-+        return x;
-+    }
-+
-+    public static long hash3(long x) {
-+        x ^= x >>> 45;
-+        x *= 0xc161abe5704b6c79L;
-+        x ^= x >>> 41;
-+        x *= 0xe3e5389aedbc90f7L;
-+        x ^= x >>> 56;
-+        x *= 0x1f9aba75a52db073L;
-+        x ^= x >>> 53;
-+        return x;
-+    }
-+
-+    private IntegerUtil() {
-+        throw new RuntimeException();
-+    }
-+}
-diff --git a/src/main/java/ca/spottedleaf/starlight/common/util/SaveUtil.java b/src/main/java/ca/spottedleaf/starlight/common/util/SaveUtil.java
-new file mode 100644
-index 0000000000000000000000000000000000000000..c2903150c8fc6955f4f4f71acc932b6c2ac83484
---- /dev/null
-+++ b/src/main/java/ca/spottedleaf/starlight/common/util/SaveUtil.java
-@@ -0,0 +1,192 @@
-+package ca.spottedleaf.starlight.common.util;
-+
-+import ca.spottedleaf.starlight.common.light.SWMRNibbleArray;
-+import ca.spottedleaf.starlight.common.light.StarLightEngine;
-+import com.mojang.logging.LogUtils;
-+import net.minecraft.nbt.CompoundTag;
-+import net.minecraft.nbt.ListTag;
-+import net.minecraft.server.level.ServerLevel;
-+import net.minecraft.world.level.ChunkPos;
-+import net.minecraft.world.level.Level;
-+import net.minecraft.world.level.chunk.ChunkAccess;
-+import net.minecraft.world.level.chunk.status.ChunkStatus;
-+import org.slf4j.Logger;
-+
-+public final class SaveUtil {
-+
-+    private static final Logger LOGGER = LogUtils.getLogger();
-+
-+    private static final int STARLIGHT_LIGHT_VERSION = 9;
-+
-+    public static int getLightVersion() {
-+        return STARLIGHT_LIGHT_VERSION;
-+    }
-+
-+    private static final String BLOCKLIGHT_STATE_TAG = "starlight.blocklight_state";
-+    private static final String SKYLIGHT_STATE_TAG = "starlight.skylight_state";
-+    private static final String STARLIGHT_VERSION_TAG = "starlight.light_version";
-+
-+    public static void saveLightHook(final Level world, final ChunkAccess chunk, final CompoundTag nbt) {
-+        try {
-+            saveLightHookReal(world, chunk, nbt);
-+        } catch (final Throwable ex) {
-+            // failing to inject is not fatal so we catch anything here. if it fails, it will have correctly set lit to false
-+            // for Vanilla to relight on load and it will not set our lit tag so we will relight on load
-+            if (ex instanceof ThreadDeath) {
-+                throw (ThreadDeath)ex;
-+            }
-+            LOGGER.warn("Failed to inject light data into save data for chunk " + chunk.getPos() + ", chunk light will be recalculated on its next load", ex);
-+        }
-+    }
-+
-+    private static void saveLightHookReal(final Level world, final ChunkAccess chunk, final CompoundTag tag) {
-+        if (tag == null) {
-+            return;
-+        }
-+
-+        final int minSection = WorldUtil.getMinLightSection(world);
-+        final int maxSection = WorldUtil.getMaxLightSection(world);
-+
-+        SWMRNibbleArray[] blockNibbles = chunk.getBlockNibbles();
-+        SWMRNibbleArray[] skyNibbles = chunk.getSkyNibbles();
-+
-+        boolean lit = chunk.isLightCorrect() || !(world instanceof ServerLevel);
-+        // diff start - store our tag for whether light data is init'd
-+        if (lit) {
-+            tag.putBoolean("isLightOn", false);
-+        }
-+        // diff end - store our tag for whether light data is init'd
-+        ChunkStatus status = ChunkStatus.byName(tag.getString("Status"));
-+
-+        CompoundTag[] sections = new CompoundTag[maxSection - minSection + 1];
-+
-+        ListTag sectionsStored = tag.getList("sections", 10);
-+
-+        for (int i = 0; i < sectionsStored.size(); ++i) {
-+            CompoundTag sectionStored = sectionsStored.getCompound(i);
-+            int k = sectionStored.getByte("Y");
-+
-+            // strip light data
-+            sectionStored.remove("BlockLight");
-+            sectionStored.remove("SkyLight");
-+
-+            if (!sectionStored.isEmpty()) {
-+                sections[k - minSection] = sectionStored;
-+            }
-+        }
-+
-+        if (lit && status.isOrAfter(ChunkStatus.LIGHT)) {
-+            for (int i = minSection; i <= maxSection; ++i) {
-+                SWMRNibbleArray.SaveState blockNibble = blockNibbles[i - minSection].getSaveState();
-+                SWMRNibbleArray.SaveState skyNibble = skyNibbles[i - minSection].getSaveState();
-+                if (blockNibble != null || skyNibble != null) {
-+                    CompoundTag section = sections[i - minSection];
-+                    if (section == null) {
-+                        section = new CompoundTag();
-+                        section.putByte("Y", (byte)i);
-+                        sections[i - minSection] = section;
-+                    }
-+
-+                    // we store under the same key so mod programs editing nbt
-+                    // can still read the data, hopefully.
-+                    // however, for compatibility we store chunks as unlit so vanilla
-+                    // is forced to re-light them if it encounters our data. It's too much of a burden
-+                    // to try and maintain compatibility with a broken and inferior skylight management system.
-+
-+                    if (blockNibble != null) {
-+                        if (blockNibble.data != null) {
-+                            section.putByteArray("BlockLight", blockNibble.data);
-+                        }
-+                        section.putInt(BLOCKLIGHT_STATE_TAG, blockNibble.state);
-+                    }
-+
-+                    if (skyNibble != null) {
-+                        if (skyNibble.data != null) {
-+                            section.putByteArray("SkyLight", skyNibble.data);
-+                        }
-+                        section.putInt(SKYLIGHT_STATE_TAG, skyNibble.state);
-+                    }
-+                }
-+            }
-+        }
-+
-+        // rewrite section list
-+        sectionsStored.clear();
-+        for (CompoundTag section : sections) {
-+            if (section != null) {
-+                sectionsStored.add(section);
-+            }
-+        }
-+        tag.put("sections", sectionsStored);
-+        if (lit) {
-+            tag.putInt(STARLIGHT_VERSION_TAG, STARLIGHT_LIGHT_VERSION); // only mark as fully lit after we have successfully injected our data
-+        }
-+    }
-+
-+    public static void loadLightHook(final Level world, final ChunkPos pos, final CompoundTag tag, final ChunkAccess into) {
-+        try {
-+            loadLightHookReal(world, pos, tag, into);
-+        } catch (final Throwable ex) {
-+            // failing to inject is not fatal so we catch anything here. if it fails, then we simply relight. Not a problem, we get correct
-+            // lighting in both cases.
-+            if (ex instanceof ThreadDeath) {
-+                throw (ThreadDeath)ex;
-+            }
-+            LOGGER.warn("Failed to load light for chunk " + pos + ", light will be recalculated", ex);
-+        }
-+    }
-+
-+    private static void loadLightHookReal(final Level world, final ChunkPos pos, final CompoundTag tag, final ChunkAccess into) {
-+        if (into == null) {
-+            return;
-+        }
-+        final int minSection = WorldUtil.getMinLightSection(world);
-+        final int maxSection = WorldUtil.getMaxLightSection(world);
-+
-+        into.setLightCorrect(false); // mark as unlit in case we fail parsing
-+
-+        SWMRNibbleArray[] blockNibbles = StarLightEngine.getFilledEmptyLight(world);
-+        SWMRNibbleArray[] skyNibbles = StarLightEngine.getFilledEmptyLight(world);
-+
-+
-+        // start copy from the original method
-+        boolean lit = tag.get("isLightOn") != null && tag.getInt(STARLIGHT_VERSION_TAG) == STARLIGHT_LIGHT_VERSION;
-+        boolean canReadSky = world.dimensionType().hasSkyLight();
-+        ChunkStatus status = ChunkStatus.byName(tag.getString("Status"));
-+        if (lit && status.isOrAfter(ChunkStatus.LIGHT)) { // diff - we add the status check here
-+            ListTag sections = tag.getList("sections", 10);
-+
-+            for (int i = 0; i < sections.size(); ++i) {
-+                CompoundTag sectionData = sections.getCompound(i);
-+                int y = sectionData.getByte("Y");
-+
-+                if (sectionData.contains("BlockLight", 7)) {
-+                    // this is where our diff is
-+                    blockNibbles[y - minSection] = new SWMRNibbleArray(sectionData.getByteArray("BlockLight").clone(), sectionData.getInt(BLOCKLIGHT_STATE_TAG)); // clone for data safety
-+                } else {
-+                    blockNibbles[y - minSection] = new SWMRNibbleArray(null, sectionData.getInt(BLOCKLIGHT_STATE_TAG));
-+                }
-+
-+                if (canReadSky) {
-+                    if (sectionData.contains("SkyLight", 7)) {
-+                        // we store under the same key so mod programs editing nbt
-+                        // can still read the data, hopefully.
-+                        // however, for compatibility we store chunks as unlit so vanilla
-+                        // is forced to re-light them if it encounters our data. It's too much of a burden
-+                        // to try and maintain compatibility with a broken and inferior skylight management system.
-+                        skyNibbles[y - minSection] = new SWMRNibbleArray(sectionData.getByteArray("SkyLight").clone(), sectionData.getInt(SKYLIGHT_STATE_TAG)); // clone for data safety
-+                    } else {
-+                        skyNibbles[y - minSection] = new SWMRNibbleArray(null, sectionData.getInt(SKYLIGHT_STATE_TAG));
-+                    }
-+                }
-+            }
-+        }
-+        // end copy from vanilla
-+
-+        into.setBlockNibbles(blockNibbles);
-+        into.setSkyNibbles(skyNibbles);
-+        into.setLightCorrect(lit); // now we set lit here, only after we've correctly parsed data
-+    }
-+
-+    private SaveUtil() {}
-+}
-diff --git a/src/main/java/ca/spottedleaf/starlight/common/util/WorldUtil.java b/src/main/java/ca/spottedleaf/starlight/common/util/WorldUtil.java
-new file mode 100644
-index 0000000000000000000000000000000000000000..dd995e25ae620ae36cd5eecb2fe10ad034ba50d2
---- /dev/null
-+++ b/src/main/java/ca/spottedleaf/starlight/common/util/WorldUtil.java
-@@ -0,0 +1,47 @@
-+package ca.spottedleaf.starlight.common.util;
-+
-+import net.minecraft.world.level.LevelHeightAccessor;
-+
-+public final class WorldUtil {
-+
-+    // min, max are inclusive
-+
-+    public static int getMaxSection(final LevelHeightAccessor world) {
-+        return world.getMaxSection() - 1; // getMaxSection() is exclusive
-+    }
-+
-+    public static int getMinSection(final LevelHeightAccessor world) {
-+        return world.getMinSection();
-+    }
-+
-+    public static int getMaxLightSection(final LevelHeightAccessor world) {
-+        return getMaxSection(world) + 1;
-+    }
-+
-+    public static int getMinLightSection(final LevelHeightAccessor world) {
-+        return getMinSection(world) - 1;
-+    }
-+
-+
-+
-+    public static int getTotalSections(final LevelHeightAccessor world) {
-+        return getMaxSection(world) - getMinSection(world) + 1;
-+    }
-+
-+    public static int getTotalLightSections(final LevelHeightAccessor world) {
-+        return getMaxLightSection(world) - getMinLightSection(world) + 1;
-+    }
-+
-+    public static int getMinBlockY(final LevelHeightAccessor world) {
-+        return getMinSection(world) << 4;
-+    }
-+
-+    public static int getMaxBlockY(final LevelHeightAccessor world) {
-+        return (getMaxSection(world) << 4) | 15;
-+    }
-+
-+    private WorldUtil() {
-+        throw new RuntimeException();
-+    }
-+
-+}
-diff --git a/src/main/java/io/papermc/paper/command/PaperCommand.java b/src/main/java/io/papermc/paper/command/PaperCommand.java
-index 534d9c380f26d6cce3c99fa88ad2e15410535094..e47fb2aa5e885162cae5cbfc9f33ff7864bf538e 100644
---- a/src/main/java/io/papermc/paper/command/PaperCommand.java
-+++ b/src/main/java/io/papermc/paper/command/PaperCommand.java
-@@ -42,6 +42,7 @@ public final class PaperCommand extends Command {
-         commands.put(Set.of("dumpitem"), new DumpItemCommand());
-         commands.put(Set.of("mobcaps", "playermobcaps"), new MobcapsCommand());
-         commands.put(Set.of("dumplisteners"), new DumpListenersCommand());
-+        commands.put(Set.of("fixlight"), new FixLightCommand());
- 
-         return commands.entrySet().stream()
-             .flatMap(entry -> entry.getKey().stream().map(s -> Map.entry(s, entry.getValue())))
-diff --git a/src/main/java/io/papermc/paper/command/subcommands/FixLightCommand.java b/src/main/java/io/papermc/paper/command/subcommands/FixLightCommand.java
-new file mode 100644
-index 0000000000000000000000000000000000000000..56524cbe4303901007e1e7fb3703a19efbf79ae7
---- /dev/null
-+++ b/src/main/java/io/papermc/paper/command/subcommands/FixLightCommand.java
-@@ -0,0 +1,109 @@
-+package io.papermc.paper.command.subcommands;
-+
-+import io.papermc.paper.command.PaperSubcommand;
-+import io.papermc.paper.util.MCUtil;
-+import net.minecraft.server.level.ServerLevel;
-+import net.minecraft.server.level.ServerPlayer;
-+import net.minecraft.server.level.ThreadedLevelLightEngine;
-+import net.minecraft.world.level.ChunkPos;
-+import net.minecraft.world.level.chunk.ChunkAccess;
-+import org.bukkit.command.CommandSender;
-+import org.bukkit.craftbukkit.entity.CraftPlayer;
-+import org.bukkit.entity.Player;
-+import org.checkerframework.checker.nullness.qual.NonNull;
-+import org.checkerframework.checker.nullness.qual.Nullable;
-+import org.checkerframework.framework.qual.DefaultQualifier;
-+
-+import static net.kyori.adventure.text.Component.text;
-+import static net.kyori.adventure.text.format.NamedTextColor.BLUE;
-+import static net.kyori.adventure.text.format.NamedTextColor.DARK_AQUA;
-+import static net.kyori.adventure.text.format.NamedTextColor.RED;
-+
-+@DefaultQualifier(NonNull.class)
-+public final class FixLightCommand implements PaperSubcommand {
-+    @Override
-+    public boolean execute(final CommandSender sender, final String subCommand, final String[] args) {
-+        this.doFixLight(sender, args);
-+        return true;
-+    }
-+
-+    private void doFixLight(final CommandSender sender, final String[] args) {
-+        if (!(sender instanceof Player)) {
-+            sender.sendMessage(text("Only players can use this command", RED));
-+            return;
-+        }
-+        @Nullable Runnable post = null;
-+        int radius = 2;
-+        if (args.length > 0) {
-+            try {
-+                final int parsed = Integer.parseInt(args[0]);
-+                if (parsed < 0) {
-+                    sender.sendMessage(text("Radius cannot be negative!", RED));
-+                    return;
-+                }
-+                final int maxRadius = 32;
-+                radius = Math.min(maxRadius, parsed);
-+                if (radius != parsed) {
-+                    post = () -> sender.sendMessage(text("Radius '" + parsed + "' was not in the required range [0, " + maxRadius + "], it was lowered to the maximum (" + maxRadius + " chunks).", RED));
-+                }
-+            } catch (final Exception e) {
-+                sender.sendMessage(text("'" + args[0] + "' is not a valid number.", RED));
-+                return;
-+            }
-+        }
-+
-+        CraftPlayer player = (CraftPlayer) sender;
-+        ServerPlayer handle = player.getHandle();
-+        ServerLevel world = (ServerLevel) handle.level();
-+        ThreadedLevelLightEngine lightengine = world.getChunkSource().getLightEngine();
-+        this.starlightFixLight(handle, world, lightengine, radius, post);
-+    }
-+
-+    private void starlightFixLight(
-+        final ServerPlayer sender,
-+        final ServerLevel world,
-+        final ThreadedLevelLightEngine lightengine,
-+        final int radius,
-+        final @Nullable Runnable done
-+    ) {
-+        final long start = System.nanoTime();
-+        final java.util.LinkedHashSet<ChunkPos> chunks = new java.util.LinkedHashSet<>(MCUtil.getSpiralOutChunks(sender.blockPosition(), radius)); // getChunkCoordinates is actually just bad mappings, this function rets position as blockpos
-+
-+        final int[] pending = new int[1];
-+        for (java.util.Iterator<ChunkPos> iterator = chunks.iterator(); iterator.hasNext(); ) {
-+            final ChunkPos chunkPos = iterator.next();
-+
-+            final @Nullable ChunkAccess chunk = (ChunkAccess) world.getChunkSource().getChunkForLighting(chunkPos.x, chunkPos.z);
-+            if (chunk == null || !chunk.isLightCorrect() || !chunk.getStatus().isOrAfter(net.minecraft.world.level.chunk.status.ChunkStatus.LIGHT)) {
-+                // cannot relight this chunk
-+                iterator.remove();
-+                continue;
-+            }
-+
-+            ++pending[0];
-+        }
-+
-+        final int[] relitChunks = new int[1];
-+        lightengine.relight(chunks,
-+            (final ChunkPos chunkPos) -> {
-+                ++relitChunks[0];
-+                sender.getBukkitEntity().sendMessage(text().color(DARK_AQUA).append(
-+                    text("Relit chunk ", BLUE), text(chunkPos.toString()),
-+                    text(", progress: ", BLUE), text((int) (Math.round(100.0 * (double) (relitChunks[0]) / (double) pending[0])) + "%")
-+                ));
-+            },
-+            (final int totalRelit) -> {
-+                final long end = System.nanoTime();
-+                final long diff = Math.round(1.0e-6 * (end - start));
-+                sender.getBukkitEntity().sendMessage(text().color(DARK_AQUA).append(
-+                    text("Relit ", BLUE), text(totalRelit),
-+                    text(" chunks. Took ", BLUE), text(diff + "ms")
-+                ));
-+                if (done != null) {
-+                    done.run();
-+                }
-+            }
-+        );
-+        sender.getBukkitEntity().sendMessage(text().color(BLUE).append(text("Relighting "), text(pending[0], DARK_AQUA), text(" chunks")));
-+    }
-+}
-diff --git a/src/main/java/net/minecraft/server/level/ChunkHolder.java b/src/main/java/net/minecraft/server/level/ChunkHolder.java
-index b12921579cb9ab3cbf5607841cc84f2f843624ea..88729d92878f98729eb5669cce5ae5b1418865a1 100644
---- a/src/main/java/net/minecraft/server/level/ChunkHolder.java
-+++ b/src/main/java/net/minecraft/server/level/ChunkHolder.java
-@@ -51,7 +51,7 @@ public class ChunkHolder {
-     private volatile CompletableFuture<ChunkResult<LevelChunk>> fullChunkFuture; private int fullChunkCreateCount; private volatile boolean isFullChunkReady; // Paper - cache chunk ticking stage
-     private volatile CompletableFuture<ChunkResult<LevelChunk>> tickingChunkFuture; private volatile boolean isTickingReady; // Paper - cache chunk ticking stage
-     private volatile CompletableFuture<ChunkResult<LevelChunk>> entityTickingChunkFuture; private volatile boolean isEntityTickingReady; // Paper - cache chunk ticking stage
--    private CompletableFuture<ChunkAccess> chunkToSave;
-+    public CompletableFuture<ChunkAccess> chunkToSave;  // Paper - public
-     @Nullable
-     private final DebugBuffer<ChunkHolder.ChunkSaveDebug> chunkToSaveHistory;
-     public int oldTicketLevel;
-@@ -261,6 +261,12 @@ public class ChunkHolder {
-         }
-     }
- 
-+    // Paper start - starlight
-+    public void broadcast(Packet<?> packet, boolean onChunkViewEdge) {
-+        this.broadcast(this.playerProvider.getPlayers(this.pos, onChunkViewEdge), packet);
-+    }
-+    // Paper end - starlight
-+
-     public void broadcastChanges(LevelChunk chunk) {
-         if (this.hasChangedSections || !this.skyChangedLightSectionFilter.isEmpty() || !this.blockChangedLightSectionFilter.isEmpty()) {
-             Level world = chunk.getLevel();
-diff --git a/src/main/java/net/minecraft/server/level/ChunkMap.java b/src/main/java/net/minecraft/server/level/ChunkMap.java
-index 35f627c58e93c03ee58b44877398432bba57dc2d..d3f63185edd1db9fab3887ea3f08982435b3a23c 100644
---- a/src/main/java/net/minecraft/server/level/ChunkMap.java
-+++ b/src/main/java/net/minecraft/server/level/ChunkMap.java
-@@ -128,7 +128,7 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
-     private final LongSet entitiesInLevel;
-     public final ServerLevel level;
-     private final ThreadedLevelLightEngine lightEngine;
--    private final BlockableEventLoop<Runnable> mainThreadExecutor;
-+    public final BlockableEventLoop<Runnable> mainThreadExecutor; // Paper - public
-     public ChunkGenerator generator;
-     private final RandomState randomState;
-     private final ChunkGeneratorStructureState chunkGeneratorState;
-diff --git a/src/main/java/net/minecraft/server/level/DistanceManager.java b/src/main/java/net/minecraft/server/level/DistanceManager.java
-index c473cb1888e9ab0e91ba44f1439b81742758304e..7a48ae2ba962ff56d0abff581b51f28b48bd9aae 100644
---- a/src/main/java/net/minecraft/server/level/DistanceManager.java
-+++ b/src/main/java/net/minecraft/server/level/DistanceManager.java
-@@ -379,7 +379,7 @@ public abstract class DistanceManager {
-     }
- 
-     public void removeTicketsOnClosing() {
--        ImmutableSet<TicketType<?>> immutableset = ImmutableSet.of(TicketType.UNKNOWN, TicketType.POST_TELEPORT, TicketType.LIGHT, TicketType.FUTURE_AWAIT); // Paper - add additional tickets to preserve
-+        ImmutableSet<TicketType<?>> immutableset = ImmutableSet.of(TicketType.UNKNOWN, TicketType.POST_TELEPORT, TicketType.LIGHT, TicketType.FUTURE_AWAIT, TicketType.CHUNK_RELIGHT, ca.spottedleaf.starlight.common.light.StarLightInterface.CHUNK_WORK_TICKET); // Paper - add additional tickets to preserve
-         ObjectIterator<Entry<SortedArraySet<Ticket<?>>>> objectiterator = this.tickets.long2ObjectEntrySet().fastIterator();
- 
-         while (objectiterator.hasNext()) {
-diff --git a/src/main/java/net/minecraft/server/level/ThreadedLevelLightEngine.java b/src/main/java/net/minecraft/server/level/ThreadedLevelLightEngine.java
-index 1dfae40ec19c4df0a97359941cf2c948cd1c9cb2..f206df06a7d8895175db31d4a840d7467ffe826f 100644
---- a/src/main/java/net/minecraft/server/level/ThreadedLevelLightEngine.java
-+++ b/src/main/java/net/minecraft/server/level/ThreadedLevelLightEngine.java
-@@ -23,6 +23,17 @@ import net.minecraft.world.level.chunk.LightChunkGetter;
- import net.minecraft.world.level.lighting.LevelLightEngine;
- import org.slf4j.Logger;
- 
-+// Paper start
-+import ca.spottedleaf.starlight.common.light.StarLightEngine;
-+import io.papermc.paper.util.CoordinateUtils;
-+import java.util.function.Supplier;
-+import net.minecraft.world.level.lighting.LayerLightEventListener;
-+import it.unimi.dsi.fastutil.longs.Long2IntOpenHashMap;
-+import it.unimi.dsi.fastutil.longs.LongArrayList;
-+import it.unimi.dsi.fastutil.longs.LongIterator;
-+import net.minecraft.world.level.chunk.status.ChunkStatus;
-+// Paper end
-+
- public class ThreadedLevelLightEngine extends LevelLightEngine implements AutoCloseable {
-     public static final int DEFAULT_BATCH_SIZE = 1000;
-     private static final Logger LOGGER = LogUtils.getLogger();
-@@ -33,6 +44,12 @@ public class ThreadedLevelLightEngine extends LevelLightEngine implements AutoCl
-     private final int taskPerBatch = 1000;
-     private final AtomicBoolean scheduled = new AtomicBoolean();
- 
-+    // Paper start - replace light engine impl
-+    protected final ca.spottedleaf.starlight.common.light.StarLightInterface theLightEngine;
-+    public final boolean hasBlockLight;
-+    public final boolean hasSkyLight;
-+    // Paper end - replace light engine impl
-+
-     public ThreadedLevelLightEngine(
-         LightChunkGetter chunkProvider,
-         ChunkMap chunkStorage,
-@@ -40,11 +57,153 @@ public class ThreadedLevelLightEngine extends LevelLightEngine implements AutoCl
-         ProcessorMailbox<Runnable> processor,
-         ProcessorHandle<ChunkTaskPriorityQueueSorter.Message<Runnable>> executor
-     ) {
--        super(chunkProvider, true, hasBlockLight);
-+        super(chunkProvider, false, false); // Paper - destroy vanilla light engine state
-         this.chunkMap = chunkStorage;
-         this.sorterMailbox = executor;
-         this.taskMailbox = processor;
-+        // Paper start - replace light engine impl
-+        this.hasBlockLight = true;
-+        this.hasSkyLight = hasBlockLight; // Nice variable name.
-+        this.theLightEngine = new ca.spottedleaf.starlight.common.light.StarLightInterface(chunkProvider, this.hasSkyLight, this.hasBlockLight, this);
-+        // Paper end - replace light engine impl
-+    }
-+
-+    // Paper start - replace light engine impl
-+    protected final ChunkAccess getChunk(final int chunkX, final int chunkZ) {
-+        return ((ServerLevel)this.theLightEngine.getWorld()).getChunkSource().getChunkAtImmediately(chunkX, chunkZ);
-+    }
-+
-+    protected long relightCounter;
-+
-+    public int relight(java.util.Set<ChunkPos> chunks_param,
-+                        java.util.function.Consumer<ChunkPos> chunkLightCallback,
-+                        java.util.function.IntConsumer onComplete) {
-+        if (!org.bukkit.Bukkit.isPrimaryThread()) {
-+            throw new IllegalStateException("Must only be called on the main thread");
-+        }
-+
-+        java.util.Set<ChunkPos> chunks = new java.util.LinkedHashSet<>(chunks_param);
-+        // add tickets
-+        java.util.Map<ChunkPos, Long> ticketIds = new java.util.HashMap<>();
-+        int totalChunks = 0;
-+        for (java.util.Iterator<ChunkPos> iterator = chunks.iterator(); iterator.hasNext();) {
-+            final ChunkPos chunkPos = iterator.next();
-+
-+            final ChunkAccess chunk = (ChunkAccess)((ServerLevel)this.theLightEngine.getWorld()).getChunkSource().getChunkForLighting(chunkPos.x, chunkPos.z);
-+            if (chunk == null || !chunk.isLightCorrect() || !chunk.getStatus().isOrAfter(ChunkStatus.LIGHT)) {
-+                // cannot relight this chunk
-+                iterator.remove();
-+                continue;
-+            }
-+
-+            final Long id = Long.valueOf(this.relightCounter++);
-+
-+            ((ServerLevel)this.theLightEngine.getWorld()).getChunkSource().addTicketAtLevel(TicketType.CHUNK_RELIGHT, chunkPos, io.papermc.paper.util.MCUtil.getTicketLevelFor(ChunkStatus.LIGHT), id);
-+            ticketIds.put(chunkPos, id);
-+
-+            ++totalChunks;
-+        }
-+
-+        this.taskMailbox.tell(() -> {
-+            this.theLightEngine.relightChunks(chunks, (ChunkPos chunkPos) -> {
-+                chunkLightCallback.accept(chunkPos);
-+                ((java.util.concurrent.Executor)((ServerLevel)this.theLightEngine.getWorld()).getChunkSource().mainThreadProcessor).execute(() -> {
-+                    ((ServerLevel)this.theLightEngine.getWorld()).getChunkSource().chunkMap.getUpdatingChunkIfPresent(chunkPos.toLong()).broadcast(new net.minecraft.network.protocol.game.ClientboundLightUpdatePacket(chunkPos, ThreadedLevelLightEngine.this, null, null), false);
-+                    ((ServerLevel)this.theLightEngine.getWorld()).getChunkSource().removeTicketAtLevel(TicketType.CHUNK_RELIGHT, chunkPos, io.papermc.paper.util.MCUtil.getTicketLevelFor(ChunkStatus.LIGHT), ticketIds.get(chunkPos));
-+                });
-+            }, onComplete);
-+        });
-+        this.tryScheduleUpdate();
-+
-+        return totalChunks;
-+    }
-+
-+    private final Long2IntOpenHashMap chunksBeingWorkedOn = new Long2IntOpenHashMap();
-+
-+    private void queueTaskForSection(final int chunkX, final int chunkY, final int chunkZ,
-+                                     final Supplier<ca.spottedleaf.starlight.common.light.StarLightInterface.LightQueue.ChunkTasks> runnable) {
-+        final ServerLevel world = (ServerLevel)this.theLightEngine.getWorld();
-+
-+        final ChunkAccess center = this.theLightEngine.getAnyChunkNow(chunkX, chunkZ);
-+        if (center == null || !center.getStatus().isOrAfter(ChunkStatus.LIGHT)) {
-+            // do not accept updates in unlit chunks, unless we might be generating a chunk. thanks to the amazing
-+            // chunk scheduling, we could be lighting and generating a chunk at the same time
-+            return;
-+        }
-+
-+        if (center.getStatus() != ChunkStatus.FULL) {
-+            // do not keep chunk loaded, we are probably in a gen thread
-+            // if we proceed to add a ticket the chunk will be loaded, which is not what we want (avoid cascading gen)
-+            runnable.get();
-+            return;
-+        }
-+
-+        if (!world.getChunkSource().chunkMap.mainThreadExecutor.isSameThread()) {
-+            // ticket logic is not safe to run off-main, re-schedule
-+            world.getChunkSource().chunkMap.mainThreadExecutor.execute(() -> {
-+                this.queueTaskForSection(chunkX, chunkY, chunkZ, runnable);
-+            });
-+            return;
-+        }
-+
-+        final long key = CoordinateUtils.getChunkKey(chunkX, chunkZ);
-+
-+        final ca.spottedleaf.starlight.common.light.StarLightInterface.LightQueue.ChunkTasks updateFuture = runnable.get();
-+
-+        if (updateFuture == null) {
-+            // not scheduled
-+            return;
-+        }
-+
-+        if (updateFuture.isTicketAdded) {
-+            // ticket already added
-+            return;
-+        }
-+        updateFuture.isTicketAdded = true;
-+
-+        final int references = this.chunksBeingWorkedOn.addTo(key, 1);
-+        if (references == 0) {
-+            final ChunkPos pos = new ChunkPos(chunkX, chunkZ);
-+            world.getChunkSource().addRegionTicket(ca.spottedleaf.starlight.common.light.StarLightInterface.CHUNK_WORK_TICKET, pos, 0, pos);
-+        }
-+
-+        updateFuture.onComplete.thenAcceptAsync((final Void ignore) -> {
-+            final int newReferences = this.chunksBeingWorkedOn.get(key);
-+            if (newReferences == 1) {
-+                this.chunksBeingWorkedOn.remove(key);
-+                final ChunkPos pos = new ChunkPos(chunkX, chunkZ);
-+                world.getChunkSource().removeRegionTicket(ca.spottedleaf.starlight.common.light.StarLightInterface.CHUNK_WORK_TICKET, pos, 0, pos);
-+            } else {
-+                this.chunksBeingWorkedOn.put(key, newReferences - 1);
-+            }
-+        }, world.getChunkSource().chunkMap.mainThreadExecutor).whenComplete((final Void ignore, final Throwable thr) -> {
-+            if (thr != null) {
-+                LOGGER.error("Failed to remove ticket level for post chunk task " + new ChunkPos(chunkX, chunkZ), thr);
-+            }
-+        });
-+    }
-+
-+    @Override
-+    public boolean hasLightWork() {
-+        // route to new light engine
-+        return this.theLightEngine.hasUpdates();
-+    }
-+
-+    @Override
-+    public LayerLightEventListener getLayerListener(final LightLayer lightType) {
-+        return lightType == LightLayer.BLOCK ? this.theLightEngine.getBlockReader() : this.theLightEngine.getSkyReader();
-+    }
-+
-+    @Override
-+    public int getRawBrightness(final BlockPos pos, final int ambientDarkness) {
-+        // need to use new light hooks for this
-+        final int sky = this.theLightEngine.getSkyReader().getLightValue(pos) - ambientDarkness;
-+        // Don't fetch the block light level if the skylight level is 15, since the value will never be higher.
-+        if (sky == 15) return 15;
-+        final int block = this.theLightEngine.getBlockReader().getLightValue(pos);
-+        return Math.max(sky, block);
-     }
-+    // Paper end - replace light engine imp
- 
-     @Override
-     public void close() {
-@@ -57,16 +216,16 @@ public class ThreadedLevelLightEngine extends LevelLightEngine implements AutoCl
- 
-     @Override
-     public void checkBlock(BlockPos pos) {
--        BlockPos blockPos = pos.immutable();
--        this.addTask(
--            SectionPos.blockToSectionCoord(pos.getX()),
--            SectionPos.blockToSectionCoord(pos.getZ()),
--            ThreadedLevelLightEngine.TaskType.PRE_UPDATE,
--            Util.name(() -> super.checkBlock(blockPos), () -> "checkBlock " + blockPos)
--        );
-+        // Paper start - replace light engine impl
-+        final BlockPos posCopy = pos.immutable();
-+        this.queueTaskForSection(posCopy.getX() >> 4, posCopy.getY() >> 4, posCopy.getZ() >> 4, () -> {
-+            return this.theLightEngine.blockChange(posCopy);
-+        });
-+        // Paper end - replace light engine impl
-     }
- 
-     protected void updateChunkStatus(ChunkPos pos) {
-+        if (true) return; // Paper - replace light engine impl
-         this.addTask(pos.x, pos.z, () -> 0, ThreadedLevelLightEngine.TaskType.PRE_UPDATE, Util.name(() -> {
-             super.retainData(pos, false);
-             super.setLightEnabled(pos, false);
-@@ -84,17 +243,16 @@ public class ThreadedLevelLightEngine extends LevelLightEngine implements AutoCl
- 
-     @Override
-     public void updateSectionStatus(SectionPos pos, boolean notReady) {
--        this.addTask(
--            pos.x(),
--            pos.z(),
--            () -> 0,
--            ThreadedLevelLightEngine.TaskType.PRE_UPDATE,
--            Util.name(() -> super.updateSectionStatus(pos, notReady), () -> "updateSectionStatus " + pos + " " + notReady)
--        );
-+        // Paper start - replace light engine impl
-+        this.queueTaskForSection(pos.getX(), pos.getY(), pos.getZ(), () -> {
-+            return this.theLightEngine.sectionChange(pos, notReady);
-+        });
-+        // Paper end - replace light engine impl
-     }
- 
-     @Override
-     public void propagateLightSources(ChunkPos chunkPos) {
-+        if (true) return; // Paper - replace light engine impl
-         this.addTask(
-             chunkPos.x,
-             chunkPos.z,
-@@ -105,6 +263,7 @@ public class ThreadedLevelLightEngine extends LevelLightEngine implements AutoCl
- 
-     @Override
-     public void setLightEnabled(ChunkPos pos, boolean retainData) {
-+        if (true) return; // Paper - replace light engine impl
-         this.addTask(
-             pos.x,
-             pos.z,
-@@ -115,6 +274,7 @@ public class ThreadedLevelLightEngine extends LevelLightEngine implements AutoCl
- 
-     @Override
-     public void queueSectionData(LightLayer lightType, SectionPos pos, @Nullable DataLayer nibbles) {
-+        if (true) return; // Paper - replace light engine impl
-         this.addTask(
-             pos.x(),
-             pos.z(),
-@@ -139,12 +299,14 @@ public class ThreadedLevelLightEngine extends LevelLightEngine implements AutoCl
- 
-     @Override
-     public void retainData(ChunkPos pos, boolean retainData) {
-+        if (true) return; // Paper - replace light engine impl
-         this.addTask(
-             pos.x, pos.z, () -> 0, ThreadedLevelLightEngine.TaskType.PRE_UPDATE, Util.name(() -> super.retainData(pos, retainData), () -> "retainData " + pos)
-         );
-     }
- 
-     public CompletableFuture<ChunkAccess> initializeLight(ChunkAccess chunk, boolean bl) {
-+        if (true) return CompletableFuture.completedFuture(chunk); // Paper - replace light engine impl
-         ChunkPos chunkPos = chunk.getPos();
-         this.addTask(chunkPos.x, chunkPos.z, ThreadedLevelLightEngine.TaskType.PRE_UPDATE, Util.name(() -> {
-             LevelChunkSection[] levelChunkSections = chunk.getSections();
-@@ -165,6 +327,37 @@ public class ThreadedLevelLightEngine extends LevelLightEngine implements AutoCl
-     }
- 
-     public CompletableFuture<ChunkAccess> lightChunk(ChunkAccess chunk, boolean excludeBlocks) {
-+        // Paper start - replace light engine impl
-+        if (true) {
-+            boolean lit = excludeBlocks;
-+            final ChunkPos chunkPos = chunk.getPos();
-+
-+            return CompletableFuture.supplyAsync(() -> {
-+                final Boolean[] emptySections = StarLightEngine.getEmptySectionsForChunk(chunk);
-+                if (!lit) {
-+                    chunk.setLightCorrect(false);
-+                    this.theLightEngine.lightChunk(chunk, emptySections);
-+                    chunk.setLightCorrect(true);
-+                } else {
-+                    this.theLightEngine.forceLoadInChunk(chunk, emptySections);
-+                    // can't really force the chunk to be edged checked, as we need neighbouring chunks - but we don't have
-+                    // them, so if it's not loaded then i guess we can't do edge checks. later loads of the chunk should
-+                    // catch what we miss here.
-+                    this.theLightEngine.checkChunkEdges(chunkPos.x, chunkPos.z);
-+                }
-+
-+                this.chunkMap.releaseLightTicket(chunkPos);
-+                return chunk;
-+            }, (runnable) -> {
-+                this.theLightEngine.scheduleChunkLight(chunkPos, runnable);
-+                this.tryScheduleUpdate();
-+            }).whenComplete((final ChunkAccess c, final Throwable throwable) -> {
-+                if (throwable != null) {
-+                    LOGGER.error("Failed to light chunk " + chunkPos, throwable);
-+                }
-+            });
-+        }
-+        // Paper end - replace light engine impl
-         ChunkPos chunkPos = chunk.getPos();
-         chunk.setLightCorrect(false);
-         this.addTask(chunkPos.x, chunkPos.z, ThreadedLevelLightEngine.TaskType.PRE_UPDATE, Util.name(() -> {
-@@ -180,7 +373,7 @@ public class ThreadedLevelLightEngine extends LevelLightEngine implements AutoCl
-     }
- 
-     public void tryScheduleUpdate() {
--        if ((!this.lightTasks.isEmpty() || super.hasLightWork()) && this.scheduled.compareAndSet(false, true)) {
-+        if (this.hasLightWork() && this.scheduled.compareAndSet(false, true)) { // Paper  // Paper - rewrite light engine
-             this.taskMailbox.tell(() -> {
-                 this.runUpdate();
-                 this.scheduled.set(false);
-@@ -201,7 +394,7 @@ public class ThreadedLevelLightEngine extends LevelLightEngine implements AutoCl
-         }
- 
-         objectListIterator.back(j);
--        super.runLightUpdates();
-+        this.theLightEngine.propagateChanges(); // Paper - rewrite light engine
- 
-         for (int var5 = 0; objectListIterator.hasNext() && var5 < i; var5++) {
-             Pair<ThreadedLevelLightEngine.TaskType, Runnable> pair2 = objectListIterator.next();
-diff --git a/src/main/java/net/minecraft/server/level/TicketType.java b/src/main/java/net/minecraft/server/level/TicketType.java
-index 0d536d72ac918fbd403397ff369d10143ee9c204..6051e5f272838ef23276a90e21c2fc821ca155d1 100644
---- a/src/main/java/net/minecraft/server/level/TicketType.java
-+++ b/src/main/java/net/minecraft/server/level/TicketType.java
-@@ -26,6 +26,7 @@ public class TicketType<T> {
-     public static final TicketType<ChunkPos> UNKNOWN = TicketType.create("unknown", Comparator.comparingLong(ChunkPos::toLong), 1);
-     public static final TicketType<Unit> PLUGIN = TicketType.create("plugin", (a, b) -> 0); // CraftBukkit
-     public static final TicketType<org.bukkit.plugin.Plugin> PLUGIN_TICKET = TicketType.create("plugin_ticket", (plugin1, plugin2) -> plugin1.getClass().getName().compareTo(plugin2.getClass().getName())); // CraftBukkit
-+    public static final TicketType<Long> CHUNK_RELIGHT = create("light_update", Long::compareTo); // Paper - ensure chunks stay loaded for lighting
- 
-     public static <T> TicketType<T> create(String name, Comparator<T> argumentComparator) {
-         return new TicketType<>(name, argumentComparator, 0L);
-diff --git a/src/main/java/net/minecraft/server/level/WorldGenRegion.java b/src/main/java/net/minecraft/server/level/WorldGenRegion.java
-index 333a02e08cccf5cb0efa2076582cbd69e95ff0c0..ca4c8e256047a4af45811c3e772b5a959e2ae941 100644
---- a/src/main/java/net/minecraft/server/level/WorldGenRegion.java
-+++ b/src/main/java/net/minecraft/server/level/WorldGenRegion.java
-@@ -109,6 +109,27 @@ public class WorldGenRegion implements WorldGenLevel {
-         }
-     }
- 
-+    // Paper start - starlight
-+    @Override
-+    public int getBrightness(final net.minecraft.world.level.LightLayer lightLayer, final BlockPos blockPos) {
-+        final ChunkAccess chunk = this.getChunk(blockPos.getX() >> 4, blockPos.getZ() >> 4);
-+        if (!chunk.isLightCorrect()) {
-+            return 0;
-+        }
-+        return this.getLightEngine().getLayerListener(lightLayer).getLightValue(blockPos);
-+    }
-+
-+
-+    @Override
-+    public int getRawBrightness(final BlockPos blockPos, final int subtract) {
-+        final ChunkAccess chunk = this.getChunk(blockPos.getX() >> 4, blockPos.getZ() >> 4);
-+        if (!chunk.isLightCorrect()) {
-+            return 0;
-+        }
-+        return this.getLightEngine().getRawBrightness(blockPos, subtract);
-+    }
-+    // Paper end - starlight
-+
-     public boolean isOldChunkAround(ChunkPos chunkPos, int checkRadius) {
-         return this.level.getChunkSource().chunkMap.isOldChunkAround(chunkPos, checkRadius);
-     }
-diff --git a/src/main/java/net/minecraft/world/level/block/state/BlockBehaviour.java b/src/main/java/net/minecraft/world/level/block/state/BlockBehaviour.java
-index f87d9cb38caf3bf92fd32f2118f76799ede418db..c7da359c525522b55763e594a1db0c26a026b73f 100644
---- a/src/main/java/net/minecraft/world/level/block/state/BlockBehaviour.java
-+++ b/src/main/java/net/minecraft/world/level/block/state/BlockBehaviour.java
-@@ -812,6 +812,7 @@ public abstract class BlockBehaviour implements FeatureElement {
-             this.spawnTerrainParticles = blockbase_info.spawnTerrainParticles;
-             this.instrument = blockbase_info.instrument;
-             this.replaceable = blockbase_info.replaceable;
-+            this.conditionallyFullOpaque = this.canOcclude & this.useShapeForLightOcclusion; // Paper
-         }
-         // Paper start - Perf: impl cached craft block data, lazy load to fix issue with loading at the wrong time
-         private org.bukkit.craftbukkit.block.data.CraftBlockData cachedCraftBlockData;
-@@ -848,6 +849,18 @@ public abstract class BlockBehaviour implements FeatureElement {
-             return this.shapeExceedsCube;
-         }
-         // Paper end
-+        // Paper start - starlight
-+        protected int opacityIfCached = -1;
-+        // ret -1 if opacity is dynamic, or -1 if the block is conditionally full opaque, else return opacity in [0, 15]
-+        public final int getOpacityIfCached() {
-+            return this.opacityIfCached;
-+        }
-+
-+        protected final boolean conditionallyFullOpaque;
-+        public final boolean isConditionallyFullOpaque() {
-+            return this.conditionallyFullOpaque;
-+        }
-+        // Paper end - starlight
- 
-         public void initCache() {
-             this.fluidState = ((Block) this.owner).getFluidState(this.asState());
-@@ -856,6 +869,7 @@ public abstract class BlockBehaviour implements FeatureElement {
-                 this.cache = new BlockBehaviour.BlockStateBase.Cache(this.asState());
-             }
-             this.shapeExceedsCube = this.cache == null || this.cache.largeCollisionShape; // Paper - moved from actual method to here
-+            this.opacityIfCached = this.cache == null || this.isConditionallyFullOpaque() ? -1 : this.cache.lightBlock; // Paper - starlight - cache opacity for light
- 
-             this.legacySolid = this.calculateSolid();
-         }
-diff --git a/src/main/java/net/minecraft/world/level/chunk/ChunkAccess.java b/src/main/java/net/minecraft/world/level/chunk/ChunkAccess.java
-index f4e3bd2ae4f63e6d3d25463a3635b8f89fecc068..1f8c72b6c7d8683d67880fa175843c73b3d39b78 100644
---- a/src/main/java/net/minecraft/world/level/chunk/ChunkAccess.java
-+++ b/src/main/java/net/minecraft/world/level/chunk/ChunkAccess.java
-@@ -77,7 +77,7 @@ public abstract class ChunkAccess implements BlockGetter, BiomeManager.NoiseBiom
-     @Nullable
-     protected BlendingData blendingData;
-     public final Map<Heightmap.Types, Heightmap> heightmaps = Maps.newEnumMap(Heightmap.Types.class);
--    protected ChunkSkyLightSources skyLightSources;
-+    // Paper - starlight - remove skyLightSources
-     private final Map<Structure, StructureStart> structureStarts = Maps.newHashMap();
-     private final Map<Structure, LongSet> structuresRefences = Maps.newHashMap();
-     protected final Map<BlockPos, CompoundTag> pendingBlockEntities = Maps.newHashMap();
-@@ -89,8 +89,55 @@ public abstract class ChunkAccess implements BlockGetter, BiomeManager.NoiseBiom
-     private static final org.bukkit.craftbukkit.persistence.CraftPersistentDataTypeRegistry DATA_TYPE_REGISTRY = new org.bukkit.craftbukkit.persistence.CraftPersistentDataTypeRegistry();
-     public org.bukkit.craftbukkit.persistence.DirtyCraftPersistentDataContainer persistentDataContainer = new org.bukkit.craftbukkit.persistence.DirtyCraftPersistentDataContainer(ChunkAccess.DATA_TYPE_REGISTRY);
-     // CraftBukkit end
-+    // Paper start - rewrite light engine
-+    private volatile ca.spottedleaf.starlight.common.light.SWMRNibbleArray[] blockNibbles;
-+
-+    private volatile ca.spottedleaf.starlight.common.light.SWMRNibbleArray[] skyNibbles;
-+
-+    private volatile boolean[] skyEmptinessMap;
-+
-+    private volatile boolean[] blockEmptinessMap;
-+
-+    public ca.spottedleaf.starlight.common.light.SWMRNibbleArray[] getBlockNibbles() {
-+        return this.blockNibbles;
-+    }
-+
-+    public void setBlockNibbles(final ca.spottedleaf.starlight.common.light.SWMRNibbleArray[] nibbles) {
-+        this.blockNibbles = nibbles;
-+    }
-+
-+    public ca.spottedleaf.starlight.common.light.SWMRNibbleArray[] getSkyNibbles() {
-+        return this.skyNibbles;
-+    }
-+
-+    public void setSkyNibbles(final ca.spottedleaf.starlight.common.light.SWMRNibbleArray[] nibbles) {
-+        this.skyNibbles = nibbles;
-+    }
-+
-+    public boolean[] getSkyEmptinessMap() {
-+        return this.skyEmptinessMap;
-+    }
-+
-+    public void setSkyEmptinessMap(final boolean[] emptinessMap) {
-+        this.skyEmptinessMap = emptinessMap;
-+    }
-+
-+    public boolean[] getBlockEmptinessMap() {
-+        return this.blockEmptinessMap;
-+    }
-+
-+    public void setBlockEmptinessMap(final boolean[] emptinessMap) {
-+        this.blockEmptinessMap = emptinessMap;
-+    }
-+    // Paper end - rewrite light engine
- 
-     public ChunkAccess(ChunkPos pos, UpgradeData upgradeData, LevelHeightAccessor heightLimitView, Registry<Biome> biomeRegistry, long inhabitedTime, @Nullable LevelChunkSection[] sectionArray, @Nullable BlendingData blendingData) {
-+        // Paper start - rewrite light engine
-+        if (!(this instanceof ImposterProtoChunk)) {
-+            this.setBlockNibbles(ca.spottedleaf.starlight.common.light.StarLightEngine.getFilledEmptyLight(heightLimitView));
-+            this.setSkyNibbles(ca.spottedleaf.starlight.common.light.StarLightEngine.getFilledEmptyLight(heightLimitView));
-+        }
-+        // Paper end - rewrite light engine
-         this.locX = pos.x; this.locZ = pos.z; // Paper - reduce need for field lookups
-         this.chunkPos = pos; this.coordinateKey = ChunkPos.asLong(locX, locZ); // Paper - cache long key
-         this.upgradeData = upgradeData;
-@@ -99,7 +146,7 @@ public abstract class ChunkAccess implements BlockGetter, BiomeManager.NoiseBiom
-         this.inhabitedTime = inhabitedTime;
-         this.postProcessing = new ShortList[heightLimitView.getSectionsCount()];
-         this.blendingData = blendingData;
--        this.skyLightSources = new ChunkSkyLightSources(heightLimitView);
-+        // Paper - starlight - remove skyLightSources
-         if (sectionArray != null) {
-             if (this.sections.length == sectionArray.length) {
-                 System.arraycopy(sectionArray, 0, this.sections, 0, this.sections.length);
-@@ -510,12 +557,12 @@ public abstract class ChunkAccess implements BlockGetter, BiomeManager.NoiseBiom
-     }
- 
-     public void initializeLightSources() {
--        this.skyLightSources.fillFrom(this);
-+        // Paper - starlight - remove skyLightSources
-     }
- 
-     @Override
-     public ChunkSkyLightSources getSkyLightSources() {
--        return this.skyLightSources;
-+        return null; // Paper - starlight - remove skyLightSources
-     }
- 
-     public static record TicksToSave(SerializableTickContainer<Block> blocks, SerializableTickContainer<Fluid> fluids) {
-diff --git a/src/main/java/net/minecraft/world/level/chunk/EmptyLevelChunk.java b/src/main/java/net/minecraft/world/level/chunk/EmptyLevelChunk.java
-index 2ee1658532cb00d7bcd1d11e03f19d21ca7f2a9e..ac754827172a4de600d0a57a7d11853481a2dbf2 100644
---- a/src/main/java/net/minecraft/world/level/chunk/EmptyLevelChunk.java
-+++ b/src/main/java/net/minecraft/world/level/chunk/EmptyLevelChunk.java
-@@ -21,6 +21,40 @@ public class EmptyLevelChunk extends LevelChunk {
-         this.biome = biomeEntry;
-     }
- 
-+    // Paper start - starlight
-+    @Override
-+    public ca.spottedleaf.starlight.common.light.SWMRNibbleArray[] getBlockNibbles() {
-+        return ca.spottedleaf.starlight.common.light.StarLightEngine.getFilledEmptyLight(this.getLevel());
-+    }
-+
-+    @Override
-+    public void setBlockNibbles(final ca.spottedleaf.starlight.common.light.SWMRNibbleArray[] nibbles) {}
-+
-+    @Override
-+    public ca.spottedleaf.starlight.common.light.SWMRNibbleArray[] getSkyNibbles() {
-+        return ca.spottedleaf.starlight.common.light.StarLightEngine.getFilledEmptyLight(this.getLevel());
-+    }
-+
-+    @Override
-+    public void setSkyNibbles(final ca.spottedleaf.starlight.common.light.SWMRNibbleArray[] nibbles) {}
-+
-+    @Override
-+    public boolean[] getSkyEmptinessMap() {
-+        return null;
-+    }
-+
-+    @Override
-+    public void setSkyEmptinessMap(final boolean[] emptinessMap) {}
-+
-+    @Override
-+    public boolean[] getBlockEmptinessMap() {
-+        return null;
-+    }
-+
-+    @Override
-+    public void setBlockEmptinessMap(final boolean[] emptinessMap) {}
-+    // Paper end - starlight
-+
-     @Override
-     public BlockState getBlockState(BlockPos pos) {
-         return Blocks.VOID_AIR.defaultBlockState();
-diff --git a/src/main/java/net/minecraft/world/level/chunk/ImposterProtoChunk.java b/src/main/java/net/minecraft/world/level/chunk/ImposterProtoChunk.java
-index 2953e93965aa688be8fc1620580701ba0c9d907e..aa5dee839d4c0dbc3c2abee9b501ec250c575cb3 100644
---- a/src/main/java/net/minecraft/world/level/chunk/ImposterProtoChunk.java
-+++ b/src/main/java/net/minecraft/world/level/chunk/ImposterProtoChunk.java
-@@ -47,6 +47,48 @@ public class ImposterProtoChunk extends ProtoChunk {
-         this.allowWrites = propagateToWrapped;
-     }
- 
-+    // Paper start - rewrite light engine
-+    @Override
-+    public ca.spottedleaf.starlight.common.light.SWMRNibbleArray[] getBlockNibbles() {
-+        return this.wrapped.getBlockNibbles();
-+    }
-+
-+    @Override
-+    public void setBlockNibbles(final ca.spottedleaf.starlight.common.light.SWMRNibbleArray[] nibbles) {
-+        this.wrapped.setBlockNibbles(nibbles);
-+    }
-+
-+    @Override
-+    public ca.spottedleaf.starlight.common.light.SWMRNibbleArray[] getSkyNibbles() {
-+        return this.wrapped.getSkyNibbles();
-+    }
-+
-+    @Override
-+    public void setSkyNibbles(final ca.spottedleaf.starlight.common.light.SWMRNibbleArray[] nibbles) {
-+        this.wrapped.setSkyNibbles(nibbles);
-+    }
-+
-+    @Override
-+    public boolean[] getSkyEmptinessMap() {
-+        return this.wrapped.getSkyEmptinessMap();
-+    }
-+
-+    @Override
-+    public void setSkyEmptinessMap(final boolean[] emptinessMap) {
-+        this.wrapped.setSkyEmptinessMap(emptinessMap);
-+    }
-+
-+    @Override
-+    public boolean[] getBlockEmptinessMap() {
-+        return this.wrapped.getBlockEmptinessMap();
-+    }
-+
-+    @Override
-+    public void setBlockEmptinessMap(final boolean[] emptinessMap) {
-+        this.wrapped.setBlockEmptinessMap(emptinessMap);
-+    }
-+    // Paper end - rewrite light engine
-+
-     @Nullable
-     @Override
-     public BlockEntity getBlockEntity(BlockPos pos) {
-diff --git a/src/main/java/net/minecraft/world/level/chunk/LevelChunk.java b/src/main/java/net/minecraft/world/level/chunk/LevelChunk.java
-index 8de6ad8b131061b2dae440dff71e2e6e7af2de39..bac191f92ea3735df19c68d5568c2c7962c8680f 100644
---- a/src/main/java/net/minecraft/world/level/chunk/LevelChunk.java
-+++ b/src/main/java/net/minecraft/world/level/chunk/LevelChunk.java
-@@ -222,6 +222,12 @@ public class LevelChunk extends ChunkAccess {
- 
-     public LevelChunk(ServerLevel world, ProtoChunk protoChunk, @Nullable LevelChunk.PostLoadProcessor entityLoader) {
-         this(world, protoChunk.getPos(), protoChunk.getUpgradeData(), protoChunk.unpackBlockTicks(), protoChunk.unpackFluidTicks(), protoChunk.getInhabitedTime(), protoChunk.getSections(), entityLoader, protoChunk.getBlendingData());
-+        // Paper start - rewrite light engine
-+        this.setBlockNibbles(protoChunk.getBlockNibbles());
-+        this.setSkyNibbles(protoChunk.getSkyNibbles());
-+        this.setSkyEmptinessMap(protoChunk.getSkyEmptinessMap());
-+        this.setBlockEmptinessMap(protoChunk.getBlockEmptinessMap());
-+        // Paper end - rewrite light engine
-         Iterator iterator = protoChunk.getBlockEntities().values().iterator();
- 
-         while (iterator.hasNext()) {
-@@ -248,7 +254,7 @@ public class LevelChunk extends ChunkAccess {
-             }
-         }
- 
--        this.skyLightSources = protoChunk.skyLightSources;
-+        // Paper - starlight - remove skyLightSources
-         this.setLightCorrect(protoChunk.isLightCorrect());
-         this.unsaved = true;
-         this.needsDecoration = true; // CraftBukkit
-@@ -437,7 +443,7 @@ public class LevelChunk extends ChunkAccess {
-                     ProfilerFiller gameprofilerfiller = this.level.getProfiler();
- 
-                     gameprofilerfiller.push("updateSkyLightSources");
--                    this.skyLightSources.update(this, j, i, l);
-+                    // Paper - starlight - remove skyLightSources
-                     gameprofilerfiller.popPush("queueCheckLight");
-                     this.level.getChunkSource().getLightEngine().checkBlock(blockposition);
-                     gameprofilerfiller.pop();
-diff --git a/src/main/java/net/minecraft/world/level/chunk/PalettedContainer.java b/src/main/java/net/minecraft/world/level/chunk/PalettedContainer.java
-index 2fa0097a9374a89177e4f1068d1bfed30b8ff122..fa9df6ebcd90d4e9e5836a37212b1f60665783b1 100644
---- a/src/main/java/net/minecraft/world/level/chunk/PalettedContainer.java
-+++ b/src/main/java/net/minecraft/world/level/chunk/PalettedContainer.java
-@@ -155,7 +155,7 @@ public class PalettedContainer<T> implements PaletteResize<T>, PalettedContainer
-         return this.get(this.strategy.getIndex(x, y, z));
-     }
- 
--    protected T get(int index) {
-+    public T get(int index) { // Paper - public
-         PalettedContainer.Data<T> data = this.data;
-         return data.palette.valueFor(data.storage.get(index));
-     }
-diff --git a/src/main/java/net/minecraft/world/level/chunk/ProtoChunk.java b/src/main/java/net/minecraft/world/level/chunk/ProtoChunk.java
-index bcc70883d23d38c408130ffe778205e371ff4e8a..576ae0cb138b265c8a3995de7b5ebc827d50949d 100644
---- a/src/main/java/net/minecraft/world/level/chunk/ProtoChunk.java
-+++ b/src/main/java/net/minecraft/world/level/chunk/ProtoChunk.java
-@@ -143,7 +143,7 @@ public class ProtoChunk extends ChunkAccess {
-                     }
- 
-                     if (LightEngine.hasDifferentLightProperties(this, pos, blockState, state)) {
--                        this.skyLightSources.update(this, m, j, o);
-+                        // Paper - starlight - remove skyLightSources
-                         this.lightEngine.checkBlock(pos);
-                     }
-                 }
-diff --git a/src/main/java/net/minecraft/world/level/chunk/status/ChunkStatus.java b/src/main/java/net/minecraft/world/level/chunk/status/ChunkStatus.java
-index ae992aeb8b836e8c2e5bab338ae46cc31c317245..95318092f8281d98132d1d3ceb4a5c36cf32eb05 100644
---- a/src/main/java/net/minecraft/world/level/chunk/status/ChunkStatus.java
-+++ b/src/main/java/net/minecraft/world/level/chunk/status/ChunkStatus.java
-@@ -117,6 +117,18 @@ public class ChunkStatus {
-     private final ChunkType chunkType;
-     private final EnumSet<Heightmap.Types> heightmapsAfter;
- 
-+    // Paper start - starlight
-+    public static ChunkStatus getStatus(String name) {
-+        try {
-+            // We need this otherwise we return EMPTY for invalid names
-+            ResourceLocation key = new ResourceLocation(name);
-+            return BuiltInRegistries.CHUNK_STATUS.getOptional(key).orElse(null);
-+        } catch (Exception ex) {
-+            return null; // invalid name
-+        }
-+    }
-+    // Paper end - starlight
-+
-     private static ChunkStatus register(
-         String id,
-         @Nullable ChunkStatus previous,
-diff --git a/src/main/java/net/minecraft/world/level/chunk/storage/ChunkSerializer.java b/src/main/java/net/minecraft/world/level/chunk/storage/ChunkSerializer.java
-index 88f0aca2da0e14ed5ec0513944fa0ba28b73b5d1..01d6b8683a9fa30d05b03ebfef8ee2dca4e83a56 100644
---- a/src/main/java/net/minecraft/world/level/chunk/storage/ChunkSerializer.java
-+++ b/src/main/java/net/minecraft/world/level/chunk/storage/ChunkSerializer.java
-@@ -90,6 +90,14 @@ public class ChunkSerializer {
-     private static final int CURRENT_DATA_VERSION = net.minecraft.SharedConstants.getCurrentVersion().getDataVersion().getVersion();
-     private static final boolean JUST_CORRUPT_IT = Boolean.getBoolean("Paper.ignoreWorldDataVersion");
-     // Paper end - Do not let the server load chunks from newer versions
-+    // Paper start - replace light engine impl
-+    private static final int STARLIGHT_LIGHT_VERSION = 9;
-+
-+    private static final String BLOCKLIGHT_STATE_TAG = "starlight.blocklight_state";
-+    private static final String SKYLIGHT_STATE_TAG = "starlight.skylight_state";
-+    private static final String STARLIGHT_VERSION_TAG = "starlight.light_version";
-+    // Paper end - replace light engine impl
-+
-     public ChunkSerializer() {}
- 
-     // Paper start - guard against serializing mismatching coordinates
-@@ -121,19 +129,26 @@ public class ChunkSerializer {
-         }
- 
-         UpgradeData chunkconverter = nbt.contains("UpgradeData", 10) ? new UpgradeData(nbt.getCompound("UpgradeData"), world) : UpgradeData.EMPTY;
--        boolean flag = nbt.getBoolean("isLightOn");
-+        boolean flag = getStatus(nbt) != null && getStatus(nbt).isOrAfter(ChunkStatus.LIGHT) && nbt.get("isLightOn") != null && nbt.getInt(STARLIGHT_VERSION_TAG) == STARLIGHT_LIGHT_VERSION; // Paper
-         ListTag nbttaglist = nbt.getList("sections", 10);
-         int i = world.getSectionsCount();
-         LevelChunkSection[] achunksection = new LevelChunkSection[i];
-         boolean flag1 = world.dimensionType().hasSkyLight();
-         ServerChunkCache chunkproviderserver = world.getChunkSource();
-         LevelLightEngine levellightengine = chunkproviderserver.getLightEngine();
-+        // Paper start
-+        ca.spottedleaf.starlight.common.light.SWMRNibbleArray[] blockNibbles = ca.spottedleaf.starlight.common.light.StarLightEngine.getFilledEmptyLight(world);
-+        ca.spottedleaf.starlight.common.light.SWMRNibbleArray[] skyNibbles = ca.spottedleaf.starlight.common.light.StarLightEngine.getFilledEmptyLight(world);
-+        final int minSection = io.papermc.paper.util.WorldUtil.getMinLightSection(world);
-+        final int maxSection = io.papermc.paper.util.WorldUtil.getMaxLightSection(world);
-+        boolean canReadSky = world.dimensionType().hasSkyLight();
-+        // Paper end
-         Registry<Biome> iregistry = world.registryAccess().registryOrThrow(Registries.BIOME);
-         Codec<PalettedContainer<Holder<Biome>>> codec = ChunkSerializer.makeBiomeCodecRW(iregistry); // CraftBukkit - read/write
-         boolean flag2 = false;
- 
-         for (int j = 0; j < nbttaglist.size(); ++j) {
--            CompoundTag nbttagcompound1 = nbttaglist.getCompound(j);
-+            CompoundTag nbttagcompound1 = nbttaglist.getCompound(j); CompoundTag sectionData = nbttagcompound1; // Paper
-             byte b0 = nbttagcompound1.getByte("Y");
-             int k = world.getSectionIndexFromSectionY(b0);
- 
-@@ -169,19 +184,39 @@ public class ChunkSerializer {
-             boolean flag3 = nbttagcompound1.contains("BlockLight", 7);
-             boolean flag4 = flag1 && nbttagcompound1.contains("SkyLight", 7);
- 
--            if (flag3 || flag4) {
--                if (!flag2) {
--                    levellightengine.retainData(chunkPos, true);
--                    flag2 = true;
--                }
--
-+            // Paper start - rewrite the light engine
-+            if (flag) {
-+                try {
-+                int y = sectionData.getByte("Y");
-+                // Paper end - rewrite the light engine
-                 if (flag3) {
--                    levellightengine.queueSectionData(LightLayer.BLOCK, SectionPos.of(chunkPos, b0), new DataLayer(nbttagcompound1.getByteArray("BlockLight")));
-+                    // Paper start - rewrite the light engine
-+                    // this is where our diff is
-+                    blockNibbles[y - minSection] = new ca.spottedleaf.starlight.common.light.SWMRNibbleArray(sectionData.getByteArray("BlockLight").clone(), sectionData.getInt(BLOCKLIGHT_STATE_TAG)); // clone for data safety
-+                } else {
-+                    blockNibbles[y - minSection] = new ca.spottedleaf.starlight.common.light.SWMRNibbleArray(null, sectionData.getInt(BLOCKLIGHT_STATE_TAG));
-+                    // Paper end - rewrite the light engine
-                 }
- 
-                 if (flag4) {
--                    levellightengine.queueSectionData(LightLayer.SKY, SectionPos.of(chunkPos, b0), new DataLayer(nbttagcompound1.getByteArray("SkyLight")));
-+                    // Paper start - rewrite the light engine
-+                    // we store under the same key so mod programs editing nbt
-+                    // can still read the data, hopefully.
-+                    // however, for compatibility we store chunks as unlit so vanilla
-+                    // is forced to re-light them if it encounters our data. It's too much of a burden
-+                    // to try and maintain compatibility with a broken and inferior skylight management system.
-+                    skyNibbles[y - minSection] = new ca.spottedleaf.starlight.common.light.SWMRNibbleArray(sectionData.getByteArray("SkyLight").clone(), sectionData.getInt(SKYLIGHT_STATE_TAG)); // clone for data safety
-+                } else if (flag1) {
-+                    skyNibbles[y - minSection] = new ca.spottedleaf.starlight.common.light.SWMRNibbleArray(null, sectionData.getInt(SKYLIGHT_STATE_TAG));
-+                    // Paper end - rewrite the light engine
-+                }
-+
-+                // Paper start - rewrite the light engine
-+                } catch (Exception ex) {
-+                    LOGGER.warn("Failed to load light data for chunk " + chunkPos + " in world '" + world.getWorld().getName() + "', light will be regenerated", ex);
-+                    flag = false;
-                 }
-+                // Paper end - rewrite light engine
-             }
-         }
- 
-@@ -211,6 +246,8 @@ public class ChunkSerializer {
-             }, chunkPos);
- 
-             object1 = new LevelChunk(world.getLevel(), chunkPos, chunkconverter, levelchunkticks, levelchunkticks1, l, achunksection, ChunkSerializer.postLoadChunk(world, nbt), blendingdata);
-+            ((LevelChunk)object1).setBlockNibbles(blockNibbles); // Paper - replace light impl
-+            ((LevelChunk)object1).setSkyNibbles(skyNibbles); // Paper - replace light impl
-         } else {
-             ProtoChunkTicks<Block> protochunkticklist = ProtoChunkTicks.load(nbt.getList("block_ticks", 10), (s) -> {
-                 return BuiltInRegistries.BLOCK.getOptional(ResourceLocation.tryParse(s));
-@@ -219,6 +256,8 @@ public class ChunkSerializer {
-                 return BuiltInRegistries.FLUID.getOptional(ResourceLocation.tryParse(s));
-             }, chunkPos);
-             ProtoChunk protochunk = new ProtoChunk(chunkPos, chunkconverter, achunksection, protochunkticklist, protochunkticklist1, world, iregistry, blendingdata);
-+            protochunk.setBlockNibbles(blockNibbles); // Paper - replace light impl
-+            protochunk.setSkyNibbles(skyNibbles); // Paper - replace light impl
- 
-             object1 = protochunk;
-             protochunk.setInhabitedTime(l);
-@@ -340,6 +379,12 @@ public class ChunkSerializer {
-     // CraftBukkit end
- 
-     public static CompoundTag write(ServerLevel world, ChunkAccess chunk) {
-+        // Paper start - rewrite light impl
-+        final int minSection = io.papermc.paper.util.WorldUtil.getMinLightSection(world);
-+        final int maxSection = io.papermc.paper.util.WorldUtil.getMaxLightSection(world);
-+        ca.spottedleaf.starlight.common.light.SWMRNibbleArray[] blockNibbles = chunk.getBlockNibbles();
-+        ca.spottedleaf.starlight.common.light.SWMRNibbleArray[] skyNibbles = chunk.getSkyNibbles();
-+        // Paper end - rewrite light impl
-         ChunkPos chunkcoordintpair = chunk.getPos();
-         CompoundTag nbttagcompound = NbtUtils.addCurrentDataVersion(new CompoundTag());
- 
-@@ -389,11 +434,14 @@ public class ChunkSerializer {
-         for (int i = lightenginethreaded.getMinLightSection(); i < lightenginethreaded.getMaxLightSection(); ++i) {
-             int j = chunk.getSectionIndexFromSectionY(i);
-             boolean flag1 = j >= 0 && j < achunksection.length;
--            DataLayer nibblearray = lightenginethreaded.getLayerListener(LightLayer.BLOCK).getDataLayerData(SectionPos.of(chunkcoordintpair, i));
--            DataLayer nibblearray1 = lightenginethreaded.getLayerListener(LightLayer.SKY).getDataLayerData(SectionPos.of(chunkcoordintpair, i));
-+            // Paper - replace light engine
- 
--            if (flag1 || nibblearray != null || nibblearray1 != null) {
--                CompoundTag nbttagcompound1 = new CompoundTag();
-+            // Paper start - replace light engine
-+            ca.spottedleaf.starlight.common.light.SWMRNibbleArray.SaveState blockNibble = blockNibbles[i - minSection].getSaveState();
-+            ca.spottedleaf.starlight.common.light.SWMRNibbleArray.SaveState skyNibble = skyNibbles[i - minSection].getSaveState();
-+            if (flag1 || blockNibble != null || skyNibble != null) {
-+                // Paper end - replace light engine
-+                CompoundTag nbttagcompound1 = new CompoundTag(); CompoundTag section = nbttagcompound1; // Paper
- 
-                 if (flag1) {
-                     LevelChunkSection chunksection = achunksection[j];
-@@ -402,13 +450,27 @@ public class ChunkSerializer {
-                     nbttagcompound1.put("biomes", (Tag) codec.encodeStart(NbtOps.INSTANCE, chunksection.getBiomes()).getOrThrow());
-                 }
- 
--                if (nibblearray != null && !nibblearray.isEmpty()) {
--                    nbttagcompound1.putByteArray("BlockLight", nibblearray.getData());
-+                // Paper start
-+                // we store under the same key so mod programs editing nbt
-+                // can still read the data, hopefully.
-+                // however, for compatibility we store chunks as unlit so vanilla
-+                // is forced to re-light them if it encounters our data. It's too much of a burden
-+                // to try and maintain compatibility with a broken and inferior skylight management system.
-+
-+                if (blockNibble != null) {
-+                    if (blockNibble.data != null) {
-+                        section.putByteArray("BlockLight", blockNibble.data);
-+                    }
-+                    section.putInt(BLOCKLIGHT_STATE_TAG, blockNibble.state);
-                 }
- 
--                if (nibblearray1 != null && !nibblearray1.isEmpty()) {
--                    nbttagcompound1.putByteArray("SkyLight", nibblearray1.getData());
-+                if (skyNibble != null) {
-+                    if (skyNibble.data != null) {
-+                        section.putByteArray("SkyLight", skyNibble.data);
-+                    }
-+                    section.putInt(SKYLIGHT_STATE_TAG, skyNibble.state);
-                 }
-+                // Paper end
- 
-                 if (!nbttagcompound1.isEmpty()) {
-                     nbttagcompound1.putByte("Y", (byte) i);
-@@ -419,7 +481,8 @@ public class ChunkSerializer {
- 
-         nbttagcompound.put("sections", nbttaglist);
-         if (flag) {
--            nbttagcompound.putBoolean("isLightOn", true);
-+            nbttagcompound.putInt(STARLIGHT_VERSION_TAG, STARLIGHT_LIGHT_VERSION); // Paper
-+            nbttagcompound.putBoolean("isLightOn", false); // Paper - set to false but still store, this allows us to detect --eraseCache (as eraseCache _removes_)
-         }
- 
-         ListTag nbttaglist1 = new ListTag();
-@@ -493,6 +556,17 @@ public class ChunkSerializer {
-         }));
-     }
- 
-+    // Paper start
-+    public static @Nullable ChunkStatus getStatus(@Nullable CompoundTag compound) {
-+        if (compound == null) {
-+            return null;
-+        }
-+
-+        // Note: Copied from below
-+        return ChunkStatus.getStatus(compound.getString("Status"));
-+    }
-+    // Paper end
-+
-     public static ChunkType getChunkTypeFromTag(@Nullable CompoundTag nbt) {
-         return nbt != null ? ChunkStatus.byName(nbt.getString("Status")).getChunkType() : ChunkType.PROTOCHUNK;
-     }
-diff --git a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
-index 34f03dd227181a03fa90845067424a26382bab9b..4b6a04e47f5d4c071607516519098fab317dcf12 100644
---- a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
-+++ b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
-@@ -507,12 +507,7 @@ public class CraftWorld extends CraftRegionAccessor implements World {
-             }
-         }
- 
--        for (final ChunkPos pos : chunksToRelight) {
--            final ChunkAccess chunk = serverChunkCache.getChunk(pos.x, pos.z, false);
--            if (chunk != null) {
--                serverChunkCache.getLightEngine().lightChunk(chunk, false);
--            }
--        }
-+        serverChunkCache.getLightEngine().relight(chunksToRelight, pos -> {}, relit -> {}); // Paper - Starlight
- 
-         return true;
-         // Paper end - implement regenerate chunk method