Update Alternate Current patch to 1.21.3 (#11602)

1 files changed, 147 insertions, 108 deletions

diff --git a/patches/unapplied/server/0994-Add-Alternate-Current-redstone-implementation.patch b/patches/server/1065-Add-Alternate-Current-redstone-implementation.patch
index dc479927b8..afc78251b9 100644
--- a/patches/unapplied/server/0994-Add-Alternate-Current-redstone-implementation.patch
+++ b/patches/server/1065-Add-Alternate-Current-redstone-implementation.patch
@@ -22,7 +22,7 @@ Alternate Current's wire handler.
 
 diff --git a/src/main/java/alternate/current/wire/LevelHelper.java b/src/main/java/alternate/current/wire/LevelHelper.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..8196460fe91bc4d1b03ca214d4323276d1d19464
+index 0000000000000000000000000000000000000000..eda108e2df9bf7d1ddd89287b8d2c2d7f1637c96
 --- /dev/null
 +++ b/src/main/java/alternate/current/wire/LevelHelper.java
 @@ -0,0 +1,66 @@
@@ -57,7 +57,7 @@ index 0000000000000000000000000000000000000000..8196460fe91bc4d1b03ca214d4323276
 +    static boolean setWireState(ServerLevel level, BlockPos pos, BlockState state, boolean updateNeighborShapes) {
 +        int y = pos.getY();
 +
-+        if (y < level.getMinBuildHeight() || y >= level.getMaxBuildHeight()) {
++        if (y < level.getMinY() || y >= level.getMaxY()) {
 +            return false;
 +        }
 +
@@ -81,7 +81,7 @@ index 0000000000000000000000000000000000000000..8196460fe91bc4d1b03ca214d4323276
 +        // notify clients of the BlockState change
 +        level.getChunkSource().blockChanged(pos);
 +        // mark the chunk for saving
-+        chunk.setUnsaved(true);
++        chunk.markUnsaved();
 +
 +        if (updateNeighborShapes) {
 +            prevState.updateIndirectNeighbourShapes(level, pos, Block.UPDATE_CLIENTS);
@@ -980,7 +980,7 @@ index 0000000000000000000000000000000000000000..4fd8cb29024330397cfe4cbc1f237d28
 +}
 diff --git a/src/main/java/alternate/current/wire/WireConnectionManager.java b/src/main/java/alternate/current/wire/WireConnectionManager.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..c69dcf2b418a0a2f373425ea0dd7144fd2f33c87
+index 0000000000000000000000000000000000000000..f03b313e58385d626490a9e64c9616fd08aa951e
 --- /dev/null
 +++ b/src/main/java/alternate/current/wire/WireConnectionManager.java
 @@ -0,0 +1,134 @@
@@ -1111,7 +1111,7 @@ index 0000000000000000000000000000000000000000..c69dcf2b418a0a2f373425ea0dd7144f
 +     * important.
 +     */
 +    void forEach(Consumer<WireConnection> consumer, UpdateOrder updateOrder, int iFlowDir) {
-+    	for (int iDir : updateOrder.cardinalNeighbors(iFlowDir)) {
++        for (int iDir : updateOrder.cardinalNeighbors(iFlowDir)) {
 +            for (WireConnection c = heads[iDir]; c != null && c.iDir == iDir; c = c.next) {
 +                consumer.accept(c);
 +            }
@@ -1120,15 +1120,14 @@ index 0000000000000000000000000000000000000000..c69dcf2b418a0a2f373425ea0dd7144f
 +}
 diff --git a/src/main/java/alternate/current/wire/WireHandler.java b/src/main/java/alternate/current/wire/WireHandler.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..8b7e33ce050ba75139df1c56c007b7922fccd573
+index 0000000000000000000000000000000000000000..259b301b2c8b64cb7974a235afb260e0e991af54
 --- /dev/null
 +++ b/src/main/java/alternate/current/wire/WireHandler.java
-@@ -0,0 +1,1053 @@
+@@ -0,0 +1,1073 @@
 +package alternate.current.wire;
 +
 +import java.util.Iterator;
 +import java.util.Queue;
-+import java.util.function.Consumer;
 +
 +import it.unimi.dsi.fastutil.longs.Long2ObjectMap;
 +import it.unimi.dsi.fastutil.longs.Long2ObjectMap.Entry;
@@ -1143,6 +1142,7 @@ index 0000000000000000000000000000000000000000..8b7e33ce050ba75139df1c56c007b792
 +import net.minecraft.world.level.block.state.BlockState;
 +import net.minecraft.world.level.redstone.InstantNeighborUpdater;
 +import net.minecraft.world.level.redstone.NeighborUpdater;
++import net.minecraft.world.level.redstone.Orientation;
 +import net.minecraft.world.level.redstone.Redstone;
 +
 +/**
@@ -1284,24 +1284,15 @@ index 0000000000000000000000000000000000000000..8b7e33ce050ba75139df1c56c007b792
 +            return iDir ^ (0b10 >>> (iDir >>> 2));
 +        }
 +
-+        // Each array is placed at the index that encodes the direction that is missing
-+        // from the array.
-+        private static final int[][] I_EXCEPT = {
-+            {       NORTH, EAST, SOUTH, DOWN, UP },
-+            { WEST,        EAST, SOUTH, DOWN, UP },
-+            { WEST, NORTH,       SOUTH, DOWN, UP },
-+            { WEST, NORTH, EAST,        DOWN, UP },
-+            { WEST, NORTH, EAST, SOUTH,       UP },
-+            { WEST, NORTH, EAST, SOUTH, DOWN     }
-+        };
-+        private static final int[][] I_EXCEPT_CARDINAL = {
-+            {       NORTH, EAST, SOUTH },
-+            { WEST,        EAST, SOUTH },
-+            { WEST, NORTH,       SOUTH },
-+            { WEST, NORTH, EAST,       },
-+            { WEST, NORTH, EAST, SOUTH },
-+            { WEST, NORTH, EAST, SOUTH }
-+        };
++        public static int index(Direction dir) {
++            for (int i = 0; i < ALL.length; i++) {
++                if (dir == ALL[i]) {
++                    return i;
++                }
++            }
++
++            return -1;
++        }
 +    }
 +
 +    /**
@@ -1402,16 +1393,22 @@ index 0000000000000000000000000000000000000000..8b7e33ce050ba75139df1c56c007b792
 +        this.fillNodeCache(0, 16);
 +    }
 +
++    private Node getOrAddNode(BlockPos pos) {
++        // just pass in null, then the state will only be retrieved
++        // if there is no node as this position yet
++        return getOrAddNode(pos, null);
++    }
++
 +    /**
-+     * Retrieve the {@link Node Node} that represents the
++     * Retrieve the {@link alternate.current.wire.Node Node} that represents the
 +     * block at the given position in the level.
 +     */
-+    private Node getOrAddNode(BlockPos pos) {
++    private Node getOrAddNode(BlockPos pos, BlockState state) {
 +        return nodes.compute(pos.asLong(), (key, node) -> {
 +            if (node == null) {
 +                // If there is not yet a node at this position, retrieve and
 +                // update one from the cache.
-+                return getNextNode(pos);
++                return getNextNode(pos, state != null ? state : level.getBlockState(pos));
 +            }
 +            if (node.invalid) {
 +                return revalidateNode(node);
@@ -1422,7 +1419,7 @@ index 0000000000000000000000000000000000000000..8b7e33ce050ba75139df1c56c007b792
 +    }
 +
 +    /**
-+     * Remove and return the {@link Node Node} at the given
++     * Remove and return the {@link alternate.current.wire.Node Node} at the given
 +     * position.
 +     */
 +    private Node removeNode(BlockPos pos) {
@@ -1430,17 +1427,9 @@ index 0000000000000000000000000000000000000000..8b7e33ce050ba75139df1c56c007b792
 +    }
 +
 +    /**
-+     * Return a {@link Node Node} that represents the block
-+     * at the given position.
-+     */
-+    private Node getNextNode(BlockPos pos) {
-+        return getNextNode(pos, level.getBlockState(pos));
-+    }
-+
-+    /**
 +     * Return a node that represents the given position and block state. If it is a
-+     * wire, then create a new {@link WireNode WireNode}.
-+     * Otherwise, grab the next {@link Node Node} from the
++     * wire, then create a new {@link alternate.current.wire.WireNode WireNode}.
++     * Otherwise, grab the next {@link alternate.current.wire.Node Node} from the
 +     * cache and update it.
 +     */
 +    private Node getNextNode(BlockPos pos, BlockState state) {
@@ -1483,6 +1472,10 @@ index 0000000000000000000000000000000000000000..8b7e33ce050ba75139df1c56c007b792
 +     * Otherwise, the node can be quickly revalidated with the new block state.
 +     */
 +    private Node revalidateNode(Node node) {
++        if (!node.invalid) {
++            return node;
++        }
++
 +        BlockPos pos = node.pos;
 +        BlockState state = level.getBlockState(pos);
 +
@@ -1539,17 +1532,28 @@ index 0000000000000000000000000000000000000000..8b7e33ce050ba75139df1c56c007b792
 +    /**
 +     * This method should be called whenever a wire receives a block update.
 +     */
-+    public void onWireUpdated(BlockPos pos) {
++    public boolean onWireUpdated(BlockPos pos, BlockState state, Orientation orientation) {
++        Node node = getOrAddNode(pos, state);
++
++        if (!node.isWire()) {
++            return false; // we should never get here
++        }
++
++        WireNode wire = node.asWire();
++
 +        invalidate();
-+        findRoots(pos);
++        revalidateNode(wire);
++        findRoots(wire, orientation);
 +        tryUpdate();
++
++        return true;
 +    }
 +
 +    /**
 +     * This method should be called whenever a wire is placed.
 +     */
-+    public void onWireAdded(BlockPos pos) {
-+        Node node = getOrAddNode(pos);
++    public void onWireAdded(BlockPos pos, BlockState state) {
++        Node node = getOrAddNode(pos, state);
 +
 +        if (!node.isWire()) {
 +            return; // we should never get here
@@ -1641,15 +1645,19 @@ index 0000000000000000000000000000000000000000..8b7e33ce050ba75139df1c56c007b792
 +     * from multiple points at once, checking for common cases like the one
 +     * described above is relatively straight-forward.
 +     */
-+    private void findRoots(BlockPos pos) {
-+        Node node = getOrAddNode(pos);
++    private void findRoots(WireNode wire, Orientation orientation) {
++        // horizontal direction bias for update order purposes
++        int iDirBias = -1;
 +
-+        if (!node.isWire()) {
-+            return; // we should never get here
++        if (orientation != null) {
++            Direction dir = orientation.getFront().getAxis().isHorizontal()
++                ? orientation.getFront()
++                : orientation.getUp();
++
++            iDirBias = Directions.index(dir);
 +        }
 +
-+        WireNode wire = node.asWire();
-+        findRoot(wire);
++        findRoot(wire, iDirBias);
 +
 +        // If the wire at the given position is not in an invalid state
 +        // we can exit early.
@@ -1657,33 +1665,43 @@ index 0000000000000000000000000000000000000000..8b7e33ce050ba75139df1c56c007b792
 +            return;
 +        }
 +
-+        for (int iDir : updateOrder.directNeighbors(wire.iFlowDir)) {
-+            Node neighbor = getNeighbor(wire, iDir);
-+
-+            if (neighbor.isConductor() || neighbor.isSignalSource()) {
-+                findRootsAround(neighbor, Directions.iOpposite(iDir));
++        if (orientation == null) {
++            // no neighborChanged orientation present, look around in all sides
++            for (int iDir : updateOrder.directNeighbors(wire.iFlowDir)) {
++                findRootsAround(wire, iDir);
 +            }
++        } else {
++            // use the orientation from the neighborChanged update to look for roots only behind
++            findRootsAround(wire, Directions.index(orientation.getFront().getOpposite()));
 +        }
 +    }
 +
 +    /**
-+     * Look for wires around the given node that require power changes.
++     * Look for wires around a neighbor of the given wire that require power changes.
 +     */
-+    private void findRootsAround(Node node, int except) {
-+        for (int iDir : Directions.I_EXCEPT_CARDINAL[except]) {
-+            Node neighbor = getNeighbor(node, iDir);
++    private void findRootsAround(WireNode wire, int iDir) {
++        Node node = getNeighbor(wire, iDir);
 +
-+            if (neighbor.isWire()) {
-+                findRoot(neighbor.asWire());
++        if (node.isConductor() || node.isSignalSource()) {
++            for (int iSide : updateOrder.cardinalNeighbors(wire.iFlowDir)) {
++                Node neighbor = getNeighbor(node, iSide);
++
++                if (neighbor.isWire()) {
++                    findRoot(neighbor.asWire(), iSide);
++                }
 +            }
 +        }
 +    }
 +
++    private void findRoot(WireNode wire) {
++        findRoot(wire, -1);
++    }
++
 +    /**
 +     * Check if the given wire requires power changes. If it does, queue it for the
 +     * breadth-first search as a root.
 +     */
-+    private void findRoot(WireNode wire) {
++    private void findRoot(WireNode wire, int iDiscoveryDir) {
 +        // Each wire only needs to be checked once.
 +        if (wire.discovered) {
 +            return;
@@ -1694,7 +1712,7 @@ index 0000000000000000000000000000000000000000..8b7e33ce050ba75139df1c56c007b792
 +        findPower(wire, false);
 +
 +        if (needsUpdate(wire)) {
-+            searchRoot(wire);
++            searchRoot(wire, iDiscoveryDir);
 +        }
 +    }
 +
@@ -1810,7 +1828,7 @@ index 0000000000000000000000000000000000000000..8b7e33ce050ba75139df1c56c007b792
 +            // Since 1.16 there is a block that is both a conductor and a signal
 +            // source: the target block!
 +            if (neighbor.isConductor()) {
-+                power = Math.max(power, getDirectSignalTo(wire, neighbor, Directions.iOpposite(iDir)));
++                power = Math.max(power, getDirectSignalTo(wire, neighbor));
 +            }
 +            if (neighbor.isSignalSource()) {
 +                power = Math.max(power, neighbor.state.getSignal(level, neighbor.pos, Directions.ALL[iDir]));
@@ -1828,10 +1846,10 @@ index 0000000000000000000000000000000000000000..8b7e33ce050ba75139df1c56c007b792
 +     * Determine the direct signal the given wire receives from neighboring blocks
 +     * through the given conductor node.
 +     */
-+    private int getDirectSignalTo(WireNode wire, Node node, int except) {
++    private int getDirectSignalTo(WireNode wire, Node node) {
 +        int power = POWER_MIN;
 +
-+        for (int iDir : Directions.I_EXCEPT[except]) {
++        for (int iDir = 0; iDir < Directions.ALL.length; iDir++) {
 +            Node neighbor = getNeighbor(node, iDir);
 +
 +            if (neighbor.isSignalSource()) {
@@ -1856,13 +1874,13 @@ index 0000000000000000000000000000000000000000..8b7e33ce050ba75139df1c56c007b792
 +    /**
 +     * Queue the given wire for the breadth-first search as a root.
 +     */
-+    private void searchRoot(WireNode wire) {
-+        int iBackupFlowDir;
-+
-+        if (wire.connections.iFlowDir < 0) {
-+            iBackupFlowDir = 0;
-+        } else {
++    private void searchRoot(WireNode wire, int iBackupFlowDir) {
++        if (wire.connections.iFlowDir >= 0) {
++            // power flow direction takes precedent
 +            iBackupFlowDir = wire.connections.iFlowDir;
++        } else if (iBackupFlowDir < 0) {
++            // use default value if none is given
++            iBackupFlowDir = 0;
 +        }
 +
 +        search(wire, true, iBackupFlowDir);
@@ -2167,7 +2185,9 @@ index 0000000000000000000000000000000000000000..8b7e33ce050ba75139df1c56c007b792
 +     * Emit a block update to the given node.
 +     */
 +    private void updateBlock(Node node, BlockPos neighborPos, Block neighborBlock) {
-+        neighborUpdater.neighborChanged(node.pos, neighborBlock, neighborPos);
++        // redstone wire is the only block that uses the neighborChanged orientation
++        // so leaving it as null should not be an issue
++        neighborUpdater.neighborChanged(node.pos, neighborBlock, null);
 +    }
 +
 +    @FunctionalInterface
@@ -2179,7 +2199,7 @@ index 0000000000000000000000000000000000000000..8b7e33ce050ba75139df1c56c007b792
 +}
 diff --git a/src/main/java/alternate/current/wire/WireNode.java b/src/main/java/alternate/current/wire/WireNode.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..33cd90c30c22200a4e1ae64f40a0bf7864546b33
+index 0000000000000000000000000000000000000000..298076a0db4e6ee6e4775ac43bf749d9f5689bdb
 --- /dev/null
 +++ b/src/main/java/alternate/current/wire/WireNode.java
 @@ -0,0 +1,122 @@
@@ -2299,17 +2319,17 @@ index 0000000000000000000000000000000000000000..33cd90c30c22200a4e1ae64f40a0bf78
 +            return true;
 +        }
 +
-+        currentPower = LevelHelper.doRedstoneEvent(level, pos, currentPower, Mth.clamp(virtualPower, Redstone.SIGNAL_MIN, Redstone.SIGNAL_MAX));
++        currentPower = LevelHelper.doRedstoneEvent(level, pos, currentPower, Mth.clamp(virtualPower, Redstone.SIGNAL_MIN, Redstone.SIGNAL_MAX));;
 +        state = state.setValue(RedStoneWireBlock.POWER, currentPower);
 +
 +        return LevelHelper.setWireState(level, pos, state, added);
 +    }
 +}
 diff --git a/src/main/java/net/minecraft/server/level/ServerLevel.java b/src/main/java/net/minecraft/server/level/ServerLevel.java
-index acc11fc7f30b6d4a3a4445b7db25bf99c93b39f2..6f3eedade396405d67ff56c66755929acda5cff0 100644
+index 3b6b6483bf855493948417f44f06427b625bc910..a0611bf5f88d5b12dc981dda14e355c751ff802e 100644
 --- a/src/main/java/net/minecraft/server/level/ServerLevel.java
 +++ b/src/main/java/net/minecraft/server/level/ServerLevel.java
-@@ -228,6 +228,7 @@ public class ServerLevel extends Level implements WorldGenLevel, ca.spottedleaf.
+@@ -230,6 +230,7 @@ public class ServerLevel extends Level implements ServerEntityGetter, WorldGenLe
      public final UUID uuid;
      public boolean hasPhysicsEvent = true; // Paper - BlockPhysicsEvent
      public boolean hasEntityMoveEvent; // Paper - Add EntityMoveEvent
@@ -2317,8 +2337,8 @@ index acc11fc7f30b6d4a3a4445b7db25bf99c93b39f2..6f3eedade396405d67ff56c66755929a
  
      public LevelChunk getChunkIfLoaded(int x, int z) {
          return this.chunkSource.getChunkAtIfLoadedImmediately(x, z); // Paper - Use getChunkIfLoadedImmediately
-@@ -2427,6 +2428,13 @@ public class ServerLevel extends Level implements WorldGenLevel, ca.spottedleaf.
-         return crashreportsystemdetails;
+@@ -2641,6 +2642,13 @@ public class ServerLevel extends Level implements ServerEntityGetter, WorldGenLe
+         return this.chunkSource.getGenerator().getSeaLevel();
      }
  
 +    // Paper start - optimize redstone (Alternate Current)
@@ -2332,13 +2352,13 @@ index acc11fc7f30b6d4a3a4445b7db25bf99c93b39f2..6f3eedade396405d67ff56c66755929a
  
          EntityCallbacks() {}
 diff --git a/src/main/java/net/minecraft/world/level/Level.java b/src/main/java/net/minecraft/world/level/Level.java
-index c4ec80bbab850fe767a345d96f02103ca43eb3cb..ca1dab96b40511d53aedd4f64e6cd0fb03583710 100644
+index 022de445bbbb869c38be4972c98dcf1c665539ec..2cc264f577fdd81d02783e0d6146bea9728789c7 100644
 --- a/src/main/java/net/minecraft/world/level/Level.java
 +++ b/src/main/java/net/minecraft/world/level/Level.java
-@@ -2030,4 +2030,14 @@ public abstract class Level implements LevelAccessor, AutoCloseable, ca.spottedl
-         }
-     }
-     // Paper end - notify observers even if grow failed
+@@ -2015,6 +2015,17 @@ public abstract class Level implements LevelAccessor, AutoCloseable, ca.spottedl
+ 
+     public abstract FuelValues fuelValues();
+ 
 +    // Paper start - optimize redstone (Alternate Current)
 +    public alternate.current.wire.WireHandler getWireHandler() {
 +        // This method is overridden in ServerLevel.
@@ -2349,12 +2369,15 @@ index c4ec80bbab850fe767a345d96f02103ca43eb3cb..ca1dab96b40511d53aedd4f64e6cd0fb
 +        return null;
 +    }
 +    // Paper end - optimize redstone (Alternate Current)
- }
++
+     public static enum ExplosionInteraction implements StringRepresentable {
+ 
+         NONE("none"), BLOCK("block"), MOB("mob"), TNT("tnt"), TRIGGER("trigger"), STANDARD("standard"); // CraftBukkit - Add STANDARD which will always use Explosion.Effect.DESTROY
 diff --git a/src/main/java/net/minecraft/world/level/block/RedStoneWireBlock.java b/src/main/java/net/minecraft/world/level/block/RedStoneWireBlock.java
-index 18ed178223cca85dbba65b1e07741622e266d318..c131734cad123a35456d18f8a161f77a4ac9ac99 100644
+index 09b8f5335cb7651d90f4d1ca61b2ec5aa324e443..21f2c61023fadcce30452a02f067cd5d87e5d8dc 100644
 --- a/src/main/java/net/minecraft/world/level/block/RedStoneWireBlock.java
 +++ b/src/main/java/net/minecraft/world/level/block/RedStoneWireBlock.java
-@@ -258,7 +258,7 @@ public class RedStoneWireBlock extends Block {
+@@ -290,7 +290,7 @@ public class RedStoneWireBlock extends Block {
          return floor.isFaceSturdy(world, pos, Direction.UP) || floor.is(Blocks.HOPPER);
      }
  
@@ -2363,49 +2386,65 @@ index 18ed178223cca85dbba65b1e07741622e266d318..c131734cad123a35456d18f8a161f77a
      // The bulk of the new functionality is found in RedstoneWireTurbo.java
      com.destroystokyo.paper.util.RedstoneWireTurbo turbo = new com.destroystokyo.paper.util.RedstoneWireTurbo(this);
  
-@@ -460,7 +460,13 @@ public class RedStoneWireBlock extends Block {
+@@ -372,7 +372,13 @@ public class RedStoneWireBlock extends Block {
      @Override
      protected void onPlace(BlockState state, Level world, BlockPos pos, BlockState oldState, boolean notify) {
          if (!oldState.is(state.getBlock()) && !world.isClientSide) {
--            this.updateSurroundingRedstone(world, pos, state, null); // Paper - Optimize redstone
+-            this.updateSurroundingRedstone(world, pos, state, null, true); // Paper - Optimize redstone
 +            // Paper start - optimize redstone - replace call to updatePowerStrength
 +            if (world.paperConfig().misc.redstoneImplementation == io.papermc.paper.configuration.WorldConfiguration.Misc.RedstoneImplementation.ALTERNATE_CURRENT) {
-+                world.getWireHandler().onWireAdded(pos); // Alternate Current
++                world.getWireHandler().onWireAdded(pos, state); // Alternate Current
 +            } else {
-+                this.updateSurroundingRedstone(world, pos, state, null); // vanilla/Eigencraft
++                this.updateSurroundingRedstone(world, pos, state, null, true); // Vanilla/Eigencraft
 +            }
-+            // Paper end - optimize redstone
-             Iterator iterator = Direction.Plane.VERTICAL.iterator();
++            // Paper end
  
-             while (iterator.hasNext()) {
-@@ -487,7 +493,13 @@ public class RedStoneWireBlock extends Block {
-                     world.updateNeighborsAt(pos.relative(enumdirection), this);
+             for (Direction direction : Direction.Plane.VERTICAL) {
+                 world.updateNeighborsAt(pos.relative(direction), this);
+@@ -391,7 +397,12 @@ public class RedStoneWireBlock extends Block {
+                     world.updateNeighborsAt(pos.relative(direction), this);
                  }
  
--                this.updateSurroundingRedstone(world, pos, state, null); // Paper - Optimize redstone
+-                this.updateSurroundingRedstone(world, pos, state, null, false); // Paper - Optimize redstone
 +                // Paper start - optimize redstone - replace call to updatePowerStrength
 +                if (world.paperConfig().misc.redstoneImplementation == io.papermc.paper.configuration.WorldConfiguration.Misc.RedstoneImplementation.ALTERNATE_CURRENT) {
 +                    world.getWireHandler().onWireRemoved(pos, state); // Alternate Current
 +                } else {
-+                    this.updateSurroundingRedstone(world, pos, state, null); // vanilla/Eigencraft
++                    this.updateSurroundingRedstone(world, pos, state, null, false); // Vanilla/Eigencraft
 +                }
-+                // Paper end - optimize redstone
                  this.updateNeighborsOfNeighboringWires(world, pos);
              }
          }
-@@ -521,8 +533,14 @@ public class RedStoneWireBlock extends Block {
+@@ -415,9 +426,15 @@ public class RedStoneWireBlock extends Block {
      @Override
-     protected void neighborChanged(BlockState state, Level world, BlockPos pos, Block sourceBlock, BlockPos sourcePos, boolean notify) {
+     protected void neighborChanged(BlockState state, Level world, BlockPos pos, Block sourceBlock, @Nullable Orientation wireOrientation, boolean notify) {
          if (!world.isClientSide) {
 +            // Paper start - optimize redstone (Alternate Current)
 +            // Alternate Current handles breaking of redstone wires in the WireHandler.
 +            if (world.paperConfig().misc.redstoneImplementation == io.papermc.paper.configuration.WorldConfiguration.Misc.RedstoneImplementation.ALTERNATE_CURRENT) {
-+                world.getWireHandler().onWireUpdated(pos);
++                world.getWireHandler().onWireUpdated(pos, state, wireOrientation);
 +            } else
 +            // Paper end - optimize redstone (Alternate Current)
-             if (state.canSurvive(world, pos)) {
--                this.updateSurroundingRedstone(world, pos, state, sourcePos); // Paper - Optimize redstone
-+                this.updateSurroundingRedstone(world, pos, state, sourcePos); // Paper - Optimize redstone (Eigencraft)
-             } else {
-                 dropResources(state, world, pos);
-                 world.removeBlock(pos, false);
+             if (sourceBlock != this || !useExperimentalEvaluator(world)) {
+                 if (state.canSurvive(world, pos)) {
+-                    this.updateSurroundingRedstone(world, pos, state, wireOrientation, false); // Paper - Optimize redstone
++                    this.updateSurroundingRedstone(world, pos, state, wireOrientation, false); // Paper - Optimize redstone (Eigencraft)
+                 } else {
+                     dropResources(state, world, pos);
+                     world.removeBlock(pos, false);
+diff --git a/src/main/java/net/minecraft/world/level/redstone/ExperimentalRedstoneUtils.java b/src/main/java/net/minecraft/world/level/redstone/ExperimentalRedstoneUtils.java
+index 4a9dc307106687bec084244c0a76e3e30f244fe2..8342dd636531729a187aff1bd69878d7aef9d3eb 100644
+--- a/src/main/java/net/minecraft/world/level/redstone/ExperimentalRedstoneUtils.java
++++ b/src/main/java/net/minecraft/world/level/redstone/ExperimentalRedstoneUtils.java
+@@ -17,6 +17,11 @@ public class ExperimentalRedstoneUtils {
+             if (up != null) {
+                 orientation = orientation.withFront(up);
+             }
++            // Paper start - Optimize redstone (Alternate Current) - use default front instead of random
++            else if (world.paperConfig().misc.redstoneImplementation == io.papermc.paper.configuration.WorldConfiguration.Misc.RedstoneImplementation.ALTERNATE_CURRENT) {
++                orientation = orientation.withFront(Direction.WEST);
++            }
++            // Paper end - Optimize redstone (Alternate Current)
+ 
+             return orientation;
+         } else {