Code/net/minecraft/world/level/lighting/LevelLightEngine.java

package net.minecraft.world.level.lighting;

import javax.annotation.Nullable;
import net.minecraft.core.BlockPos;
import net.minecraft.core.SectionPos;
import net.minecraft.world.level.ChunkPos;
import net.minecraft.world.level.LevelHeightAccessor;
import net.minecraft.world.level.LightLayer;
import net.minecraft.world.level.chunk.DataLayer;
import net.minecraft.world.level.chunk.LightChunkGetter;

public class LevelLightEngine implements LightEventListener {
    public static final int LIGHT_SECTION_PADDING = 1;
    public static final LevelLightEngine EMPTY = new LevelLightEngine();
    protected final LevelHeightAccessor levelHeightAccessor;
    @Nullable
    private final LightEngine<?, ?> blockEngine;
    @Nullable
    private final LightEngine<?, ?> skyEngine;

    public LevelLightEngine(LightChunkGetter p_75805_, boolean p_75806_, boolean p_75807_) {
        this.levelHeightAccessor = p_75805_.getLevel();
        this.blockEngine = p_75806_ ? new BlockLightEngine(p_75805_) : null;
        this.skyEngine = p_75807_ ? new SkyLightEngine(p_75805_) : null;
    }

    private LevelLightEngine() {
        this.levelHeightAccessor = LevelHeightAccessor.create(0, 0);
        this.blockEngine = null;
        this.skyEngine = null;
    }

    @Override
    public void checkBlock(BlockPos p_75823_) {
        if (this.blockEngine != null) {
            this.blockEngine.checkBlock(p_75823_);
        }

        if (this.skyEngine != null) {
            this.skyEngine.checkBlock(p_75823_);
        }
    }

    @Override
    public boolean hasLightWork() {
        return this.skyEngine != null && this.skyEngine.hasLightWork() ? true : this.blockEngine != null && this.blockEngine.hasLightWork();
    }

    @Override
    public int runLightUpdates() {
        int i = 0;
        if (this.blockEngine != null) {
            i += this.blockEngine.runLightUpdates();
        }

        if (this.skyEngine != null) {
            i += this.skyEngine.runLightUpdates();
        }

        return i;
    }

    @Override
    public void updateSectionStatus(SectionPos p_75827_, boolean p_75828_) {
        if (this.blockEngine != null) {
            this.blockEngine.updateSectionStatus(p_75827_, p_75828_);
        }

        if (this.skyEngine != null) {
            this.skyEngine.updateSectionStatus(p_75827_, p_75828_);
        }
    }

    @Override
    public void setLightEnabled(ChunkPos p_285439_, boolean p_285012_) {
        if (this.blockEngine != null) {
            this.blockEngine.setLightEnabled(p_285439_, p_285012_);
        }

        if (this.skyEngine != null) {
            this.skyEngine.setLightEnabled(p_285439_, p_285012_);
        }
    }

    @Override
    public void propagateLightSources(ChunkPos p_284998_) {
        if (this.blockEngine != null) {
            this.blockEngine.propagateLightSources(p_284998_);
        }

        if (this.skyEngine != null) {
            this.skyEngine.propagateLightSources(p_284998_);
        }
    }

    public LayerLightEventListener getLayerListener(LightLayer p_75815_) {
        if (p_75815_ == LightLayer.BLOCK) {
            return (LayerLightEventListener)(this.blockEngine == null ? LayerLightEventListener.DummyLightLayerEventListener.INSTANCE : this.blockEngine);
        } else {
            return (LayerLightEventListener)(this.skyEngine == null ? LayerLightEventListener.DummyLightLayerEventListener.INSTANCE : this.skyEngine);
        }
    }

    public String getDebugData(LightLayer p_75817_, SectionPos p_75818_) {
        if (p_75817_ == LightLayer.BLOCK) {
            if (this.blockEngine != null) {
                return this.blockEngine.getDebugData(p_75818_.asLong());
            }
        } else if (this.skyEngine != null) {
            return this.skyEngine.getDebugData(p_75818_.asLong());
        }

        return "n/a";
    }

    public LayerLightSectionStorage.SectionType getDebugSectionType(LightLayer p_285008_, SectionPos p_285336_) {
        if (p_285008_ == LightLayer.BLOCK) {
            if (this.blockEngine != null) {
                return this.blockEngine.getDebugSectionType(p_285336_.asLong());
            }
        } else if (this.skyEngine != null) {
            return this.skyEngine.getDebugSectionType(p_285336_.asLong());
        }

        return LayerLightSectionStorage.SectionType.EMPTY;
    }

    public void queueSectionData(LightLayer p_285328_, SectionPos p_284962_, @Nullable DataLayer p_285035_) {
        if (p_285328_ == LightLayer.BLOCK) {
            if (this.blockEngine != null) {
                this.blockEngine.queueSectionData(p_284962_.asLong(), p_285035_);
            }
        } else if (this.skyEngine != null) {
            this.skyEngine.queueSectionData(p_284962_.asLong(), p_285035_);
        }
    }

    public void retainData(ChunkPos p_75829_, boolean p_75830_) {
        if (this.blockEngine != null) {
            this.blockEngine.retainData(p_75829_, p_75830_);
        }

        if (this.skyEngine != null) {
            this.skyEngine.retainData(p_75829_, p_75830_);
        }
    }

    public int getRawBrightness(BlockPos p_75832_, int p_75833_) {
        int i = this.skyEngine == null ? 0 : this.skyEngine.getLightValue(p_75832_) - p_75833_;
        int j = this.blockEngine == null ? 0 : this.blockEngine.getLightValue(p_75832_);
        return Math.max(j, i);
    }

    public boolean lightOnInColumn(long p_369308_) {
        return this.blockEngine == null || this.blockEngine.storage.lightOnInColumn(p_369308_) && (this.skyEngine == null || this.skyEngine.storage.lightOnInColumn(p_369308_));
    }

    public int getLightSectionCount() {
        return this.levelHeightAccessor.getSectionsCount() + 2;
    }

    public int getMinLightSection() {
        return this.levelHeightAccessor.getMinSectionY() - 1;
    }

    public int getMaxLightSection() {
        return this.getMinLightSection() + this.getLightSectionCount();
    }
}