diff options
Diffstat (limited to 'patches/server/1022-Actually-optimise-explosions.patch')
| -rw-r--r-- | patches/server/1022-Actually-optimise-explosions.patch | 496 |
1 files changed, 496 insertions, 0 deletions
diff --git a/patches/server/1022-Actually-optimise-explosions.patch b/patches/server/1022-Actually-optimise-explosions.patch new file mode 100644 index 0000000000..a835a68c02 --- /dev/null +++ b/patches/server/1022-Actually-optimise-explosions.patch @@ -0,0 +1,496 @@ +From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 +From: Spottedleaf <[email protected]> +Date: Tue, 12 Sep 2023 06:50:16 -0700 +Subject: [PATCH] Actually optimise explosions + +The vast majority of blocks an explosion of power ~4 tries +to destroy are duplicates. The core of the block destroying +part of this patch is to cache the block state, resistance, and +whether it should explode - as those will not change. + +The other part of this patch is to optimise the visibility +percentage calculation. The new visibility calculation takes +advantage of the block caching already done by the explosion logic. +It continues to update the cache as the visibility calculation +uses many rays which can overlap significantly. + +Effectively, the patch uses a lot of caching to eliminate +redundant operations. + +Performance benchmarking explosions is challenging, as it varies +depending on the power, the number of nearby entities, and the +nearby terrain. This means that no benchmark can cover all the cases. +I decided to test a giant block of TNT, as that's where the optimisations +would be needed the most. + +I tested using a 50x10x50 block of TNT above ground +and determined the following: + +Vanilla time per explosion: 2.27ms +Lithium time per explosion: 1.07ms +This patch time per explosion: 0.45ms + +The results indicate that this logic is 5 times faster than Vanilla +and 2.3 times faster than Lithium. + +diff --git a/src/main/java/net/minecraft/world/level/Explosion.java b/src/main/java/net/minecraft/world/level/Explosion.java +index c1eafcc5b0e6486a6bffc497091e1d48b6b31a7e..45243249a561440512ef2a620c60b02e159c80e2 100644 +--- a/src/main/java/net/minecraft/world/level/Explosion.java ++++ b/src/main/java/net/minecraft/world/level/Explosion.java +@@ -97,6 +97,271 @@ public class Explosion { + this.damageCalculator = behavior == null ? this.makeDamageCalculator(entity) : behavior; + } + ++ // Paper start - optimise collisions ++ private static final double[] CACHED_RAYS; ++ static { ++ final it.unimi.dsi.fastutil.doubles.DoubleArrayList rayCoords = new it.unimi.dsi.fastutil.doubles.DoubleArrayList(); ++ ++ for (int x = 0; x <= 15; ++x) { ++ for (int y = 0; y <= 15; ++y) { ++ for (int z = 0; z <= 15; ++z) { ++ if ((x == 0 || x == 15) || (y == 0 || y == 15) || (z == 0 || z == 15)) { ++ double xDir = (double)((float)x / 15.0F * 2.0F - 1.0F); ++ double yDir = (double)((float)y / 15.0F * 2.0F - 1.0F); ++ double zDir = (double)((float)z / 15.0F * 2.0F - 1.0F); ++ ++ double mag = Math.sqrt( ++ xDir * xDir + yDir * yDir + zDir * zDir ++ ); ++ ++ rayCoords.add((xDir / mag) * (double)0.3F); ++ rayCoords.add((yDir / mag) * (double)0.3F); ++ rayCoords.add((zDir / mag) * (double)0.3F); ++ } ++ } ++ } ++ } ++ ++ CACHED_RAYS = rayCoords.toDoubleArray(); ++ } ++ ++ private static final int CHUNK_CACHE_SHIFT = 2; ++ private static final int CHUNK_CACHE_MASK = (1 << CHUNK_CACHE_SHIFT) - 1; ++ private static final int CHUNK_CACHE_WIDTH = 1 << CHUNK_CACHE_SHIFT; ++ ++ private static final int BLOCK_EXPLOSION_CACHE_SHIFT = 3; ++ private static final int BLOCK_EXPLOSION_CACHE_MASK = (1 << BLOCK_EXPLOSION_CACHE_SHIFT) - 1; ++ private static final int BLOCK_EXPLOSION_CACHE_WIDTH = 1 << BLOCK_EXPLOSION_CACHE_SHIFT; ++ ++ // resistance = (res + 0.3F) * 0.3F; ++ // so for resistance = 0, we need res = -0.3F ++ private static final Float ZERO_RESISTANCE = Float.valueOf(-0.3f); ++ private it.unimi.dsi.fastutil.longs.Long2ObjectOpenHashMap<ExplosionBlockCache> blockCache = null; ++ ++ public static final class ExplosionBlockCache { ++ ++ public final long key; ++ public final BlockPos immutablePos; ++ public final BlockState blockState; ++ public final FluidState fluidState; ++ public final float resistance; ++ public final boolean outOfWorld; ++ public Boolean shouldExplode; // null -> not called yet ++ public net.minecraft.world.phys.shapes.VoxelShape cachedCollisionShape; ++ ++ public ExplosionBlockCache(long key, BlockPos immutablePos, BlockState blockState, FluidState fluidState, float resistance, ++ boolean outOfWorld) { ++ this.key = key; ++ this.immutablePos = immutablePos; ++ this.blockState = blockState; ++ this.fluidState = fluidState; ++ this.resistance = resistance; ++ this.outOfWorld = outOfWorld; ++ } ++ } ++ ++ private long[] chunkPosCache = null; ++ private net.minecraft.world.level.chunk.LevelChunk[] chunkCache = null; ++ ++ private ExplosionBlockCache getOrCacheExplosionBlock(final int x, final int y, final int z, ++ final long key, final boolean calculateResistance) { ++ ExplosionBlockCache ret = this.blockCache.get(key); ++ if (ret != null) { ++ return ret; ++ } ++ ++ BlockPos pos = new BlockPos(x, y, z); ++ ++ if (!this.level.isInWorldBounds(pos)) { ++ ret = new ExplosionBlockCache(key, pos, null, null, 0.0f, true); ++ } else { ++ net.minecraft.world.level.chunk.LevelChunk chunk; ++ long chunkKey = io.papermc.paper.util.CoordinateUtils.getChunkKey(x >> 4, z >> 4); ++ int chunkCacheKey = ((x >> 4) & CHUNK_CACHE_MASK) | (((z >> 4) << CHUNK_CACHE_SHIFT) & (CHUNK_CACHE_MASK << CHUNK_CACHE_SHIFT)); ++ if (this.chunkPosCache[chunkCacheKey] == chunkKey) { ++ chunk = this.chunkCache[chunkCacheKey]; ++ } else { ++ this.chunkPosCache[chunkCacheKey] = chunkKey; ++ this.chunkCache[chunkCacheKey] = chunk = this.level.getChunk(x >> 4, z >> 4); ++ } ++ ++ BlockState blockState = chunk.getBlockStateFinal(x, y, z); ++ FluidState fluidState = blockState.getFluidState(); ++ ++ Optional<Float> resistance = !calculateResistance ? Optional.empty() : this.damageCalculator.getBlockExplosionResistance((Explosion)(Object)this, this.level, pos, blockState, fluidState); ++ ++ ret = new ExplosionBlockCache( ++ key, pos, blockState, fluidState, ++ (resistance.orElse(ZERO_RESISTANCE).floatValue() + 0.3f) * 0.3f, ++ false ++ ); ++ } ++ ++ this.blockCache.put(key, ret); ++ ++ return ret; ++ } ++ ++ private boolean clipsAnything(final Vec3 from, final Vec3 to, ++ final io.papermc.paper.util.CollisionUtil.LazyEntityCollisionContext context, ++ final ExplosionBlockCache[] blockCache, ++ final BlockPos.MutableBlockPos currPos) { ++ // assume that context.delegated = false ++ final double adjX = io.papermc.paper.util.CollisionUtil.COLLISION_EPSILON * (from.x - to.x); ++ final double adjY = io.papermc.paper.util.CollisionUtil.COLLISION_EPSILON * (from.y - to.y); ++ final double adjZ = io.papermc.paper.util.CollisionUtil.COLLISION_EPSILON * (from.z - to.z); ++ ++ if (adjX == 0.0 && adjY == 0.0 && adjZ == 0.0) { ++ return false; ++ } ++ ++ final double toXAdj = to.x - adjX; ++ final double toYAdj = to.y - adjY; ++ final double toZAdj = to.z - adjZ; ++ final double fromXAdj = from.x + adjX; ++ final double fromYAdj = from.y + adjY; ++ final double fromZAdj = from.z + adjZ; ++ ++ int currX = Mth.floor(fromXAdj); ++ int currY = Mth.floor(fromYAdj); ++ int currZ = Mth.floor(fromZAdj); ++ ++ final double diffX = toXAdj - fromXAdj; ++ final double diffY = toYAdj - fromYAdj; ++ final double diffZ = toZAdj - fromZAdj; ++ ++ final double dxDouble = Math.signum(diffX); ++ final double dyDouble = Math.signum(diffY); ++ final double dzDouble = Math.signum(diffZ); ++ ++ final int dx = (int)dxDouble; ++ final int dy = (int)dyDouble; ++ final int dz = (int)dzDouble; ++ ++ final double normalizedDiffX = diffX == 0.0 ? Double.MAX_VALUE : dxDouble / diffX; ++ final double normalizedDiffY = diffY == 0.0 ? Double.MAX_VALUE : dyDouble / diffY; ++ final double normalizedDiffZ = diffZ == 0.0 ? Double.MAX_VALUE : dzDouble / diffZ; ++ ++ double normalizedCurrX = normalizedDiffX * (diffX > 0.0 ? (1.0 - Mth.frac(fromXAdj)) : Mth.frac(fromXAdj)); ++ double normalizedCurrY = normalizedDiffY * (diffY > 0.0 ? (1.0 - Mth.frac(fromYAdj)) : Mth.frac(fromYAdj)); ++ double normalizedCurrZ = normalizedDiffZ * (diffZ > 0.0 ? (1.0 - Mth.frac(fromZAdj)) : Mth.frac(fromZAdj)); ++ ++ for (;;) { ++ currPos.set(currX, currY, currZ); ++ ++ // ClipContext.Block.COLLIDER -> BlockBehaviour.BlockStateBase::getCollisionShape ++ // ClipContext.Fluid.NONE -> ignore fluids ++ ++ // read block from cache ++ final long key = BlockPos.asLong(currX, currY, currZ); ++ ++ final int cacheKey = ++ (currX & BLOCK_EXPLOSION_CACHE_MASK) | ++ (currY & BLOCK_EXPLOSION_CACHE_MASK) << (BLOCK_EXPLOSION_CACHE_SHIFT) | ++ (currZ & BLOCK_EXPLOSION_CACHE_MASK) << (BLOCK_EXPLOSION_CACHE_SHIFT + BLOCK_EXPLOSION_CACHE_SHIFT); ++ ExplosionBlockCache cachedBlock = blockCache[cacheKey]; ++ if (cachedBlock == null || cachedBlock.key != key) { ++ blockCache[cacheKey] = cachedBlock = this.getOrCacheExplosionBlock(currX, currY, currZ, key, false); ++ } ++ ++ final BlockState blockState = cachedBlock.blockState; ++ if (blockState != null && !blockState.emptyCollisionShape()) { ++ net.minecraft.world.phys.shapes.VoxelShape collision = cachedBlock.cachedCollisionShape; ++ if (collision == null) { ++ collision = blockState.getConstantCollisionShape(); ++ if (collision == null) { ++ collision = blockState.getCollisionShape(this.level, currPos, context); ++ if (!context.isDelegated()) { ++ // if it was not delegated during this call, assume that for any future ones it will not be delegated ++ // again, and cache the result ++ cachedBlock.cachedCollisionShape = collision; ++ } ++ } else { ++ cachedBlock.cachedCollisionShape = collision; ++ } ++ } ++ ++ if (!collision.isEmpty() && collision.clip(from, to, currPos) != null) { ++ return true; ++ } ++ } ++ ++ if (normalizedCurrX > 1.0 && normalizedCurrY > 1.0 && normalizedCurrZ > 1.0) { ++ return false; ++ } ++ ++ // inc the smallest normalized coordinate ++ ++ if (normalizedCurrX < normalizedCurrY) { ++ if (normalizedCurrX < normalizedCurrZ) { ++ currX += dx; ++ normalizedCurrX += normalizedDiffX; ++ } else { ++ // x < y && x >= z <--> z < y && z <= x ++ currZ += dz; ++ normalizedCurrZ += normalizedDiffZ; ++ } ++ } else if (normalizedCurrY < normalizedCurrZ) { ++ // y <= x && y < z ++ currY += dy; ++ normalizedCurrY += normalizedDiffY; ++ } else { ++ // y <= x && z <= y <--> z <= y && z <= x ++ currZ += dz; ++ normalizedCurrZ += normalizedDiffZ; ++ } ++ } ++ } ++ ++ private float getSeenFraction(final Vec3 source, final Entity target, ++ final ExplosionBlockCache[] blockCache, ++ final BlockPos.MutableBlockPos blockPos) { ++ final AABB boundingBox = target.getBoundingBox(); ++ final double diffX = boundingBox.maxX - boundingBox.minX; ++ final double diffY = boundingBox.maxY - boundingBox.minY; ++ final double diffZ = boundingBox.maxZ - boundingBox.minZ; ++ ++ final double incX = 1.0 / (diffX * 2.0 + 1.0); ++ final double incY = 1.0 / (diffY * 2.0 + 1.0); ++ final double incZ = 1.0 / (diffZ * 2.0 + 1.0); ++ ++ if (incX < 0.0 || incY < 0.0 || incZ < 0.0) { ++ return 0.0f; ++ } ++ ++ final double offX = (1.0 - Math.floor(1.0 / incX) * incX) * 0.5 + boundingBox.minX; ++ final double offY = boundingBox.minY; ++ final double offZ = (1.0 - Math.floor(1.0 / incZ) * incZ) * 0.5 + boundingBox.minZ; ++ ++ final io.papermc.paper.util.CollisionUtil.LazyEntityCollisionContext context = new io.papermc.paper.util.CollisionUtil.LazyEntityCollisionContext(target); ++ ++ int totalRays = 0; ++ int missedRays = 0; ++ ++ for (double dx = 0.0; dx <= 1.0; dx += incX) { ++ final double fromX = Math.fma(dx, diffX, offX); ++ for (double dy = 0.0; dy <= 1.0; dy += incY) { ++ final double fromY = Math.fma(dy, diffY, offY); ++ for (double dz = 0.0; dz <= 1.0; dz += incZ) { ++ ++totalRays; ++ ++ final Vec3 from = new Vec3( ++ fromX, ++ fromY, ++ Math.fma(dz, diffZ, offZ) ++ ); ++ ++ if (!this.clipsAnything(from, source, context, blockCache, blockPos)) { ++ ++missedRays; ++ } ++ } ++ } ++ } ++ ++ return (float)missedRays / (float)totalRays; ++ } ++ // Paper end - optimise collisions ++ + private ExplosionDamageCalculator makeDamageCalculator(@Nullable Entity entity) { + return (ExplosionDamageCalculator) (entity == null ? Explosion.EXPLOSION_DAMAGE_CALCULATOR : new EntityBasedExplosionDamageCalculator(entity)); + } +@@ -149,40 +414,90 @@ public class Explosion { + int i; + int j; + +- for (int k = 0; k < 16; ++k) { +- for (i = 0; i < 16; ++i) { +- for (j = 0; j < 16; ++j) { +- if (k == 0 || k == 15 || i == 0 || i == 15 || j == 0 || j == 15) { +- double d0 = (double) ((float) k / 15.0F * 2.0F - 1.0F); +- double d1 = (double) ((float) i / 15.0F * 2.0F - 1.0F); +- double d2 = (double) ((float) j / 15.0F * 2.0F - 1.0F); +- double d3 = Math.sqrt(d0 * d0 + d1 * d1 + d2 * d2); +- +- d0 /= d3; +- d1 /= d3; +- d2 /= d3; ++ // Paper start - optimise explosions ++ this.blockCache = new it.unimi.dsi.fastutil.longs.Long2ObjectOpenHashMap<>(); ++ ++ this.chunkPosCache = new long[CHUNK_CACHE_WIDTH * CHUNK_CACHE_WIDTH]; ++ java.util.Arrays.fill(this.chunkPosCache, ChunkPos.INVALID_CHUNK_POS); ++ ++ this.chunkCache = new net.minecraft.world.level.chunk.LevelChunk[CHUNK_CACHE_WIDTH * CHUNK_CACHE_WIDTH]; ++ ++ final ExplosionBlockCache[] blockCache = new ExplosionBlockCache[BLOCK_EXPLOSION_CACHE_WIDTH * BLOCK_EXPLOSION_CACHE_WIDTH * BLOCK_EXPLOSION_CACHE_WIDTH]; ++ // use initial cache value that is most likely to be used: the source position ++ final ExplosionBlockCache initialCache; ++ { ++ final int blockX = Mth.floor(this.x); ++ final int blockY = Mth.floor(this.y); ++ final int blockZ = Mth.floor(this.z); ++ ++ final long key = BlockPos.asLong(blockX, blockY, blockZ); ++ ++ initialCache = this.getOrCacheExplosionBlock(blockX, blockY, blockZ, key, true); ++ } ++ // only ~1/3rd of the loop iterations in vanilla will result in a ray, as it is iterating the perimeter of ++ // a 16x16x16 cube ++ // we can cache the rays and their normals as well, so that we eliminate the excess iterations / checks and ++ // calculations in one go ++ // additional aggressive caching of block retrieval is very significant, as at low power (i.e tnt) most ++ // block retrievals are not unique ++ for (int ray = 0, len = CACHED_RAYS.length; ray < len;) { ++ { ++ { ++ { ++ ExplosionBlockCache cachedBlock = initialCache; ++ ++ double d0 = CACHED_RAYS[ray]; ++ double d1 = CACHED_RAYS[ray + 1]; ++ double d2 = CACHED_RAYS[ray + 2]; ++ ray += 3; ++ // Paper end - optimise explosions + float f = this.radius * (0.7F + this.level.random.nextFloat() * 0.6F); + double d4 = this.x; + double d5 = this.y; + double d6 = this.z; + + for (float f1 = 0.3F; f > 0.0F; f -= 0.22500001F) { +- BlockPos blockposition = BlockPos.containing(d4, d5, d6); +- BlockState iblockdata = this.level.getBlockState(blockposition); +- if (!iblockdata.isDestroyable()) continue; // Paper +- FluidState fluid = iblockdata.getFluidState(); // Paper ++ // Paper start - optimise explosions ++ final int blockX = Mth.floor(d4); ++ final int blockY = Mth.floor(d5); ++ final int blockZ = Mth.floor(d6); ++ ++ final long key = BlockPos.asLong(blockX, blockY, blockZ); ++ ++ if (cachedBlock.key != key) { ++ final int cacheKey = ++ (blockX & BLOCK_EXPLOSION_CACHE_MASK) | ++ (blockY & BLOCK_EXPLOSION_CACHE_MASK) << (BLOCK_EXPLOSION_CACHE_SHIFT) | ++ (blockZ & BLOCK_EXPLOSION_CACHE_MASK) << (BLOCK_EXPLOSION_CACHE_SHIFT + BLOCK_EXPLOSION_CACHE_SHIFT); ++ cachedBlock = blockCache[cacheKey]; ++ if (cachedBlock == null || cachedBlock.key != key) { ++ blockCache[cacheKey] = cachedBlock = this.getOrCacheExplosionBlock(blockX, blockY, blockZ, key, true); ++ } ++ } + +- if (!this.level.isInWorldBounds(blockposition)) { ++ if (cachedBlock.outOfWorld) { + break; + } + +- Optional<Float> optional = this.damageCalculator.getBlockExplosionResistance(this, this.level, blockposition, iblockdata, fluid); ++ BlockPos blockposition = cachedBlock.immutablePos; ++ BlockState iblockdata = cachedBlock.blockState; ++ // Paper end - optimise explosions + +- if (optional.isPresent()) { +- f -= ((Float) optional.get() + 0.3F) * 0.3F; +- } ++ if (!iblockdata.isDestroyable()) continue; // Paper ++ // Paper - optimise explosions + +- if (f > 0.0F && this.damageCalculator.shouldBlockExplode(this, this.level, blockposition, iblockdata, f)) { ++ // Paper - optimise explosions ++ ++ f -= cachedBlock.resistance; // Paper - optimise explosions ++ ++ if (f > 0.0F && cachedBlock.shouldExplode == null) { // Paper - optimise explosions ++ // Paper start - optimise explosions ++ // note: we expect shouldBlockExplode to be pure with respect to power, as Vanilla currently is. ++ // basically, it is unused, which allows us to cache the result ++ final boolean shouldExplode = this.damageCalculator.shouldBlockExplode(this, this.level, cachedBlock.immutablePos, cachedBlock.blockState, f); ++ cachedBlock.shouldExplode = shouldExplode ? Boolean.TRUE : Boolean.FALSE; ++ if (shouldExplode && (this.fire || !cachedBlock.blockState.isAir())) { ++ // Paper end - optimise explosions + set.add(blockposition); + // Paper start - prevent headless pistons from forming + if (!io.papermc.paper.configuration.GlobalConfiguration.get().unsupportedSettings.allowHeadlessPistons && iblockdata.getBlock() == Blocks.MOVING_PISTON) { +@@ -193,11 +508,12 @@ public class Explosion { + } + } + // Paper end ++ } // Paper - optimise explosions + } + +- d4 += d0 * 0.30000001192092896D; +- d5 += d1 * 0.30000001192092896D; +- d6 += d2 * 0.30000001192092896D; ++ d4 += d0; // Paper - optimise explosions ++ d5 += d1; // Paper - optimise explosions ++ d6 += d2; // Paper - optimise explosions + } + } + } +@@ -217,6 +533,8 @@ public class Explosion { + Vec3 vec3d = new Vec3(this.x, this.y, this.z); + Iterator iterator = list.iterator(); + ++ final BlockPos.MutableBlockPos blockPos = new BlockPos.MutableBlockPos(); // Paper - optimise explosions ++ + while (iterator.hasNext()) { + Entity entity = (Entity) iterator.next(); + +@@ -233,7 +551,7 @@ public class Explosion { + d8 /= d11; + d9 /= d11; + d10 /= d11; +- double d12 = this.getBlockDensity(vec3d, entity); // Paper - Optimize explosions ++ double d12 = this.getBlockDensity(vec3d, entity, blockCache, blockPos); // Paper - Optimize explosions // Paper - optimise explosions + double d13 = (1.0D - d7) * d12; + + // CraftBukkit start +@@ -256,7 +574,7 @@ public class Explosion { + // Calculate damage separately for each EntityComplexPart + double d7part; + if (list.contains(entityComplexPart) && (d7part = Math.sqrt(entityComplexPart.distanceToSqr(vec3d)) / f2) <= 1.0D) { +- double d13part = (1.0D - d7part) * Explosion.getSeenPercent(vec3d, entityComplexPart); ++ double d13part = (1.0D - d7part) * this.getSeenFraction(vec3d, entityComplexPart, blockCache, blockPos); // Paper - optimise explosions + entityComplexPart.hurt(this.getDamageSource(), (float) ((int) ((d13part * d13part + d13part) / 2.0D * 7.0D * (double) f2 + 1.0D))); + } + } +@@ -297,6 +615,10 @@ public class Explosion { + } + } + ++ this.blockCache = null; // Paper - optimise explosions ++ this.chunkPosCache = null; // Paper - optimise explosions ++ this.chunkCache = null; // Paper - optimise explosions ++ + } + + public void finalizeExplosion(boolean particles) { +@@ -526,14 +848,14 @@ public class Explosion { + private BlockInteraction() {} + } + // Paper start - Optimize explosions +- private float getBlockDensity(Vec3 vec3d, Entity entity) { ++ private float getBlockDensity(Vec3 vec3d, Entity entity, ExplosionBlockCache[] blockCache, BlockPos.MutableBlockPos blockPos) { // Paper - optimise explosions + if (!this.level.paperConfig().environment.optimizeExplosions) { +- return getSeenPercent(vec3d, entity); ++ return this.getSeenFraction(vec3d, entity, blockCache, blockPos); // Paper - optimise explosions + } + CacheKey key = new CacheKey(this, entity.getBoundingBox()); + Float blockDensity = this.level.explosionDensityCache.get(key); + if (blockDensity == null) { +- blockDensity = getSeenPercent(vec3d, entity); ++ blockDensity = this.getSeenFraction(vec3d, entity, blockCache, blockPos); // Paper - optimise explosions; + this.level.explosionDensityCache.put(key, blockDensity); + } + |