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Heavily optimize the BlockColumn impl used during surface rule evaluation

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embeddedt 2026-03-14 21:40:16 -04:00
parent 22915a91a1
commit dbe9acb3d8
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GPG Key ID: A69433EC199B5613
3 changed files with 169 additions and 3 deletions
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44
src/main/java/org/embeddedt/modernfix/common/mixin/perf/optimize_surface_rules/SurfaceSystemMixin.java
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@ -1,11 +1,14 @@
package org.embeddedt.modernfix.common.mixin.perf.optimize_surface_rules;
import com.llamalad7.mixinextras.sugar.Local;
import com.llamalad7.mixinextras.sugar.Share;
import com.llamalad7.mixinextras.sugar.ref.LocalRef;
import net.minecraft.core.BlockPos;
import net.minecraft.core.Holder;
import net.minecraft.core.Registry;
import net.minecraft.world.level.biome.Biome;
import net.minecraft.world.level.biome.BiomeManager;
import net.minecraft.world.level.chunk.BlockColumn;
import net.minecraft.world.level.chunk.ChunkAccess;
import net.minecraft.world.level.levelgen.NoiseChunk;
import net.minecraft.world.level.levelgen.RandomState;
@ -13,10 +16,12 @@ import net.minecraft.world.level.levelgen.SurfaceRules;
import net.minecraft.world.level.levelgen.SurfaceSystem;
import net.minecraft.world.level.levelgen.WorldGenerationContext;
import org.embeddedt.modernfix.world.gen.ChunkBiomeLookup;
import org.embeddedt.modernfix.world.gen.PrefetchingBlockColumn;
import org.spongepowered.asm.mixin.Mixin;
import org.spongepowered.asm.mixin.injection.At;
import org.spongepowered.asm.mixin.injection.Inject;
import org.spongepowered.asm.mixin.injection.ModifyArg;
import org.spongepowered.asm.mixin.injection.Redirect;
import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
import java.util.function.Function;
@ -24,17 +29,52 @@ import java.util.function.Function;
@Mixin(SurfaceSystem.class)
public class SurfaceSystemMixin {
private static final ThreadLocal<ChunkBiomeLookup> MFIX_LOOKUP_CACHE = ThreadLocal.withInitial(ChunkBiomeLookup::new);
private static final ThreadLocal<PrefetchingBlockColumn> MFIX_BLOCK_COLUMN = new ThreadLocal<>();
@ModifyArg(method = "buildSurface", at = @At(value = "INVOKE", target = "Lnet/minecraft/world/level/levelgen/SurfaceRules$Context;<init>(Lnet/minecraft/world/level/levelgen/SurfaceSystem;Lnet/minecraft/world/level/levelgen/RandomState;Lnet/minecraft/world/level/chunk/ChunkAccess;Lnet/minecraft/world/level/levelgen/NoiseChunk;Ljava/util/function/Function;Lnet/minecraft/core/Registry;Lnet/minecraft/world/level/levelgen/WorldGenerationContext;)V"), index = 4)
private Function<BlockPos, Holder<Biome>> useFasterLookup(Function<BlockPos, Holder<Biome>> biomeGetter, @Local(ordinal = 0, argsOnly = true) BiomeManager manager, @Local(ordinal = 0, argsOnly = true) ChunkAccess chunk) {
private Function<BlockPos, Holder<Biome>> useFasterLookup(Function<BlockPos, Holder<Biome>> biomeGetter,
@Local(ordinal = 0, argsOnly = true) BiomeManager manager,
@Local(ordinal = 0, argsOnly = true) ChunkAccess chunk,
@Share("chunkBiomeLookup") LocalRef<ChunkBiomeLookup> lookupRef) {
var lookup = MFIX_LOOKUP_CACHE.get();
BiomeManagerAccessor accessor = (BiomeManagerAccessor)manager;
lookup.prepare(accessor.mfix$getBiomeSource(), accessor.mfix$getZoomSeed(), chunk, manager);
lookupRef.set(lookup);
return lookup;
}
@Inject(method = "buildSurface", at = @At("RETURN"))
private void disposeLookup(RandomState randomState, BiomeManager biomeManager, Registry<Biome> biomes, boolean p_224652_, WorldGenerationContext context, ChunkAccess chunk, NoiseChunk noiseChunk, SurfaceRules.RuleSource ruleSource, CallbackInfo ci) {
private void finishAndDisposeLookups(RandomState randomState, BiomeManager biomeManager, Registry<Biome> biomes, boolean p_224652_, WorldGenerationContext context, ChunkAccess chunk, NoiseChunk noiseChunk, SurfaceRules.RuleSource ruleSource, CallbackInfo ci) {
MFIX_LOOKUP_CACHE.get().dispose();
var column = MFIX_BLOCK_COLUMN.get();
if (column != null) {
column.dispose();
}
}
@Redirect(method = "buildSurface", at = @At(value = "INVOKE", target = "Lnet/minecraft/world/level/biome/BiomeManager;getBiome(Lnet/minecraft/core/BlockPos;)Lnet/minecraft/core/Holder;"))
private Holder<Biome> useFasterLookup(BiomeManager instance, BlockPos pos, @Share("chunkBiomeLookup") LocalRef<ChunkBiomeLookup> lookupRef) {
return lookupRef.get().apply(pos);
}
@Inject(method = "buildSurface", at = @At(value = "INVOKE", target = "Lnet/minecraft/world/level/levelgen/SurfaceRules$Context;<init>(Lnet/minecraft/world/level/levelgen/SurfaceSystem;Lnet/minecraft/world/level/levelgen/RandomState;Lnet/minecraft/world/level/chunk/ChunkAccess;Lnet/minecraft/world/level/levelgen/NoiseChunk;Ljava/util/function/Function;Lnet/minecraft/core/Registry;Lnet/minecraft/world/level/levelgen/WorldGenerationContext;)V"))
private void captureRealBlockColumn(CallbackInfo ci, @Local(ordinal = 0) LocalRef<BlockColumn> column,
@Local(ordinal = 0, argsOnly = true) ChunkAccess chunk,
@Share("prefetchColumn") LocalRef<PrefetchingBlockColumn> prefetchRef) {
var prefetchingBlockColumn = MFIX_BLOCK_COLUMN.get();
if (prefetchingBlockColumn == null || prefetchingBlockColumn.getExpectedHeight() != chunk.getHeight()) {
prefetchingBlockColumn = new PrefetchingBlockColumn(chunk.getHeight());
MFIX_BLOCK_COLUMN.set(prefetchingBlockColumn);
}
column.set(prefetchingBlockColumn);
prefetchRef.set(prefetchingBlockColumn);
}
@Inject(method = "buildSurface", at = @At(value = "INVOKE", target = "Lnet/minecraft/core/BlockPos$MutableBlockPos;setZ(I)Lnet/minecraft/core/BlockPos$MutableBlockPos;", ordinal = 0, shift = At.Shift.AFTER))
private void prefetchBlockArray(RandomState randomState, BiomeManager biomeManager, Registry<Biome> biomes, boolean p_224652_,
WorldGenerationContext context, ChunkAccess chunk, NoiseChunk noiseChunk, SurfaceRules.RuleSource ruleSource, CallbackInfo ci,
@Local(ordinal = 0) BlockColumn column,
@Local(ordinal = 0) BlockPos.MutableBlockPos cursor) {
((PrefetchingBlockColumn)column).prefetch(chunk, cursor.getX() & 15, cursor.getZ() & 15);
}
}

2
src/main/java/org/embeddedt/modernfix/forge/init/ModernFixForge.java
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@ -138,7 +138,7 @@ public class ModernFixForge {
public void onServerStarted(ServerStartedEvent event) {
commonMod.onServerStarted();
if (Boolean.getBoolean("modernfix.runWorldgenBenchmark")) {
int iterations = Integer.getInteger("modernfix.worldgenIterations", 100);
int iterations = Integer.getInteger("modernfix.worldgenIterations", 15);
int testRadius = Integer.getInteger("modernfix.worldgenTestRadius", 10);
var level = event.getServer().overworld();
ModernFix.LOGGER.info("Worldgen results: {}", WorldgenBenchmark.run(level, new ChunkPos(0, 0), testRadius, iterations,

126
src/main/java/org/embeddedt/modernfix/world/gen/PrefetchingBlockColumn.java Normal file
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@ -0,0 +1,126 @@
package org.embeddedt.modernfix.world.gen;
import net.minecraft.core.BlockPos;
import net.minecraft.core.SectionPos;
import net.minecraft.world.level.block.Blocks;
import net.minecraft.world.level.block.state.BlockState;
import net.minecraft.world.level.chunk.BlockColumn;
import net.minecraft.world.level.chunk.ChunkAccess;
import net.minecraft.world.level.chunk.LevelChunkSection;
import net.minecraft.world.level.levelgen.Heightmap;
/**
* Wraps a BlockColumn and prefetches all block states for a column into an array.
*
* <p>Writes bypass {@link ChunkAccess#setBlockState} and go directly to the section,
* skipping heightmap and light updates that are unnecessary during the surface building
* stage (which runs before {@code INITIALIZE_LIGHT}).
*/
public class PrefetchingBlockColumn implements BlockColumn {
private static final BlockState AIR = Blocks.AIR.defaultBlockState();
private static final BlockState VOID_AIR = Blocks.VOID_AIR.defaultBlockState();
private final BlockState[] states;
private final BlockPos.MutableBlockPos cursor = new BlockPos.MutableBlockPos();
private ChunkAccess chunk;
private LevelChunkSection[] sections;
private int minBuildHeight;
private int localX, localZ;
public PrefetchingBlockColumn(int height) {
this.states = new BlockState[height];
}
public int getExpectedHeight() {
return this.states.length;
}
/**
* Prefetch all block states for the column at the given local XZ coordinates.
* Must be called before any getBlock/setBlock calls for this column.
*/
public void prefetch(ChunkAccess chunk, int localX, int localZ) {
if (chunk.getHeight() != this.states.length) {
throw new IllegalStateException();
}
this.chunk = chunk;
this.sections = chunk.getSections();
this.minBuildHeight = chunk.getMinBuildHeight();
this.localX = localX;
this.localZ = localZ;
var sections = this.sections;
var states = this.states;
int offset = 0;
for (LevelChunkSection section : sections) {
if (section.hasOnlyAir()) {
for (int y = 0; y < 16; y++) {
states[offset + y] = AIR;
}
} else {
var container = section.getStates();
for (int y = 0; y < 16; y++) {
states[offset + y] = container.get(localX, y, localZ);
}
}
offset += 16;
}
}
/**
* Clear cached references to allow GC of the chunk between uses.
*/
public void dispose() {
this.chunk = null;
this.sections = null;
}
@Override
public BlockState getBlock(int y) {
int idx = y - minBuildHeight;
if (idx >= 0 && idx < states.length) {
return states[idx];
}
return VOID_AIR;
}
private void markPostprocessing(int y) {
cursor.set(
SectionPos.sectionToBlockCoord(chunk.getPos().x, localX),
y,
SectionPos.sectionToBlockCoord(chunk.getPos().z, localZ)
);
chunk.markPosForPostprocessing(cursor);
}
private void updateHeightmap(Heightmap.Types type, int y, BlockState newState) {
chunk.getOrCreateHeightmapUnprimed(type).update(localX, y, localZ, newState);
}
@Override
public void setBlock(int y, BlockState state) {
int idx = y - minBuildHeight;
var states = this.states;
if (idx >= 0 && idx < states.length) {
BlockState oldState = states[idx];
if (oldState == state) {
return;
}
states[idx] = state;
// Write directly to the section, bypassing ProtoChunk.setBlockState which
// does expensive heightmap updates that are not needed during surface building.
int sectionIdx = idx >> 4;
sections[sectionIdx].setBlockState(localX, y & 15, localZ, state, false);
if (!state.getFluidState().isEmpty()) {
markPostprocessing(y);
}
// Update heightmaps if the air/motion-blocking properties changed.
if (oldState.isAir() != state.isAir()) {
updateHeightmap(Heightmap.Types.WORLD_SURFACE_WG, y, state);
}
if (oldState.blocksMotion() != state.blocksMotion()) {
updateHeightmap(Heightmap.Types.OCEAN_FLOOR_WG, y, state);
}
}
}
}