Rewrite regenerateChunkRegion

src/main/java/carpet/mixins/BlockLightStorage_scarpetChunkCreationMixin.java

@@ -0,0 +1,65 @@
+package carpet.mixins;
+
+import org.spongepowered.asm.mixin.Mixin;
+
+import carpet.fakes.ChunkLightProviderInterface;
+import carpet.fakes.LightStorageInterface;
+import net.minecraft.util.math.BlockPos;
+import net.minecraft.util.math.ChunkSectionPos;
+import net.minecraft.util.math.Direction;
+import net.minecraft.world.LightType;
+import net.minecraft.world.chunk.ChunkNibbleArray;
+import net.minecraft.world.chunk.ChunkProvider;
+import net.minecraft.world.chunk.light.BlockLightStorage;
+import net.minecraft.world.chunk.light.BlockLightStorage.Data;
+import net.minecraft.world.chunk.light.ChunkLightProvider;
+import net.minecraft.world.chunk.light.LightStorage;
+
+@Mixin(BlockLightStorage.class)
+public abstract class BlockLightStorage_scarpetChunkCreationMixin extends LightStorage<Data> implements LightStorageInterface
+{
+    private BlockLightStorage_scarpetChunkCreationMixin(final LightType lightType, final ChunkProvider chunkProvider, final Data lightData)
+    {
+        super(lightType, chunkProvider, lightData);
+    }
+
+    @Override
+    public void processRelight(final ChunkLightProvider<?, ?> lightProvider, final long cPos)
+    {
+        final LevelPropagatorInterface levelPropagator = (LevelPropagatorInterface) lightProvider;
+
+        for (int y = -1; y < 17; ++y)
+        {
+            final long sectionPos = ChunkSectionPos.asLong(ChunkSectionPos.getX(cPos), y, ChunkSectionPos.getZ(cPos));
+            final long pos = BlockPos.asLong(ChunkSectionPos.getWorldCoord(ChunkSectionPos.getX(sectionPos)), ChunkSectionPos.getWorldCoord(y), ChunkSectionPos.getWorldCoord(ChunkSectionPos.getZ(sectionPos)));
+
+            if (!this.hasLight(sectionPos))
+                continue;
+
+            for (final Direction dir : Direction.Type.HORIZONTAL)
+            {
+                final ChunkNibbleArray neighborLightArray = this.getLightArray(ChunkSectionPos.offset(sectionPos, dir));
+
+                if (neighborLightArray == null)
+                    continue;
+
+                final int ox = 15 * Math.max(dir.getOffsetX(), 0);
+                final int oz = 15 * Math.max(dir.getOffsetZ(), 0);
+
+                final int dx = Math.abs(dir.getOffsetZ());
+                final int dz = Math.abs(dir.getOffsetX());
+
+                for (int t = 0; t < 16; ++t)
+                    for (int dy = 0; dy < 16; ++dy)
+                    {
+                        final long dst = BlockPos.add(pos, ox + t * dx, dy, oz + t * dz);
+                        final long src = BlockPos.offset(dst, dir);
+
+                        final int srcLevel = ((ChunkLightProviderInterface) lightProvider).callGetCurrentLevelFromArray(neighborLightArray, src);
+
+                        levelPropagator.invokeUpdateLevel(src, dst, levelPropagator.callGetPropagatedLevel(src, dst, srcLevel), true);
+                    }
+            }
+        }
+    }
+}