src/game/java/net/minecraft/client/renderer/debug/LightSectionDebugRenderer.java

package net.minecraft.client.renderer.debug;

import com.mojang.blaze3d.vertex.PoseStack;
import com.mojang.blaze3d.vertex.VertexConsumer;
import java.time.Duration;
import java.time.Instant;
import javax.annotation.Nullable;
import net.minecraft.client.Minecraft;
import net.minecraft.client.renderer.MultiBufferSource;
import net.minecraft.client.renderer.RenderType;
import net.minecraft.client.renderer.ShapeRenderer;
import net.minecraft.core.Direction;
import net.minecraft.core.SectionPos;
import net.minecraft.world.level.LightLayer;
import net.minecraft.world.level.lighting.LayerLightSectionStorage;
import net.minecraft.world.level.lighting.LevelLightEngine;
import net.minecraft.world.phys.shapes.BitSetDiscreteVoxelShape;
import net.minecraft.world.phys.shapes.DiscreteVoxelShape;
import net.minecraftforge.api.distmarker.Dist;
import net.minecraftforge.api.distmarker.OnlyIn;
import org.joml.Matrix4f;
import org.joml.Vector4f;

@OnlyIn(Dist.CLIENT)
public class LightSectionDebugRenderer implements DebugRenderer.SimpleDebugRenderer {
    private static final Duration REFRESH_INTERVAL = Duration.ofMillis(500L);
    private static final int RADIUS = 10;
    private static final Vector4f LIGHT_AND_BLOCKS_COLOR = new Vector4f(1.0F, 1.0F, 0.0F, 0.25F);
    private static final Vector4f LIGHT_ONLY_COLOR = new Vector4f(0.25F, 0.125F, 0.0F, 0.125F);
    private final Minecraft minecraft;
    private final LightLayer lightLayer;
    private Instant lastUpdateTime = Instant.now();
    @Nullable
    private LightSectionDebugRenderer.SectionData data;

    public LightSectionDebugRenderer(Minecraft p_283340_, LightLayer p_283096_) {
        this.minecraft = p_283340_;
        this.lightLayer = p_283096_;
    }

    @Override
    public void render(PoseStack p_281418_, MultiBufferSource p_282487_, double p_282164_, double p_282565_, double p_281615_) {
        Instant instant = Instant.now();
        if (this.data == null || Duration.between(this.lastUpdateTime, instant).compareTo(REFRESH_INTERVAL) > 0) {
            this.lastUpdateTime = instant;
            this.data = new LightSectionDebugRenderer.SectionData(
                this.minecraft.level.getLightEngine(), SectionPos.of(this.minecraft.player.blockPosition()), 10, this.lightLayer
            );
        }

        renderEdges(p_281418_, this.data.lightAndBlocksShape, this.data.minPos, p_282487_, p_282164_, p_282565_, p_281615_, LIGHT_AND_BLOCKS_COLOR);
        renderEdges(p_281418_, this.data.lightShape, this.data.minPos, p_282487_, p_282164_, p_282565_, p_281615_, LIGHT_ONLY_COLOR);
        VertexConsumer vertexconsumer = p_282487_.getBuffer(RenderType.debugSectionQuads());
        renderFaces(p_281418_, this.data.lightAndBlocksShape, this.data.minPos, vertexconsumer, p_282164_, p_282565_, p_281615_, LIGHT_AND_BLOCKS_COLOR);
        renderFaces(p_281418_, this.data.lightShape, this.data.minPos, vertexconsumer, p_282164_, p_282565_, p_281615_, LIGHT_ONLY_COLOR);
    }

    private static void renderFaces(
        PoseStack p_283088_,
        DiscreteVoxelShape p_281747_,
        SectionPos p_282941_,
        VertexConsumer p_283103_,
        double p_281419_,
        double p_282520_,
        double p_281976_,
        Vector4f p_282342_
    ) {
        p_281747_.forAllFaces((p_282087_, p_283360_, p_282854_, p_282233_) -> {
            int i = p_283360_ + p_282941_.getX();
            int j = p_282854_ + p_282941_.getY();
            int k = p_282233_ + p_282941_.getZ();
            renderFace(p_283088_, p_283103_, p_282087_, p_281419_, p_282520_, p_281976_, i, j, k, p_282342_);
        });
    }

    private static void renderEdges(
        PoseStack p_282890_,
        DiscreteVoxelShape p_282950_,
        SectionPos p_281925_,
        MultiBufferSource p_281516_,
        double p_281554_,
        double p_283233_,
        double p_281690_,
        Vector4f p_282916_
    ) {
        p_282950_.forAllEdges((p_283441_, p_283631_, p_282083_, p_281900_, p_281481_, p_283547_) -> {
            int i = p_283441_ + p_281925_.getX();
            int j = p_283631_ + p_281925_.getY();
            int k = p_282083_ + p_281925_.getZ();
            int l = p_281900_ + p_281925_.getX();
            int i1 = p_281481_ + p_281925_.getY();
            int j1 = p_283547_ + p_281925_.getZ();
            VertexConsumer vertexconsumer = p_281516_.getBuffer(RenderType.debugLineStrip(1.0));
            renderEdge(p_282890_, vertexconsumer, p_281554_, p_283233_, p_281690_, i, j, k, l, i1, j1, p_282916_);
        }, true);
    }

    private static void renderFace(
        PoseStack p_283612_,
        VertexConsumer p_281996_,
        Direction p_282340_,
        double p_281988_,
        double p_282440_,
        double p_282235_,
        int p_282751_,
        int p_282270_,
        int p_282159_,
        Vector4f p_283316_
    ) {
        float f = (float)((double)SectionPos.sectionToBlockCoord(p_282751_) - p_281988_);
        float f1 = (float)((double)SectionPos.sectionToBlockCoord(p_282270_) - p_282440_);
        float f2 = (float)((double)SectionPos.sectionToBlockCoord(p_282159_) - p_282235_);
        ShapeRenderer.renderFace(
            p_283612_, p_281996_, p_282340_, f, f1, f2, f + 16.0F, f1 + 16.0F, f2 + 16.0F, p_283316_.x(), p_283316_.y(), p_283316_.z(), p_283316_.w()
        );
    }

    private static void renderEdge(
        PoseStack p_283045_,
        VertexConsumer p_282888_,
        double p_283424_,
        double p_283677_,
        double p_283390_,
        int p_281439_,
        int p_282106_,
        int p_282462_,
        int p_282216_,
        int p_281474_,
        int p_281542_,
        Vector4f p_283667_
    ) {
        float f = (float)((double)SectionPos.sectionToBlockCoord(p_281439_) - p_283424_);
        float f1 = (float)((double)SectionPos.sectionToBlockCoord(p_282106_) - p_283677_);
        float f2 = (float)((double)SectionPos.sectionToBlockCoord(p_282462_) - p_283390_);
        float f3 = (float)((double)SectionPos.sectionToBlockCoord(p_282216_) - p_283424_);
        float f4 = (float)((double)SectionPos.sectionToBlockCoord(p_281474_) - p_283677_);
        float f5 = (float)((double)SectionPos.sectionToBlockCoord(p_281542_) - p_283390_);
        Matrix4f matrix4f = p_283045_.last().pose();
        p_282888_.addVertex(matrix4f, f, f1, f2).setColor(p_283667_.x(), p_283667_.y(), p_283667_.z(), 1.0F);
        p_282888_.addVertex(matrix4f, f3, f4, f5).setColor(p_283667_.x(), p_283667_.y(), p_283667_.z(), 1.0F);
    }

    @OnlyIn(Dist.CLIENT)
    static final class SectionData {
        final DiscreteVoxelShape lightAndBlocksShape;
        final DiscreteVoxelShape lightShape;
        final SectionPos minPos;

        SectionData(LevelLightEngine p_283220_, SectionPos p_282370_, int p_282804_, LightLayer p_283151_) {
            int i = p_282804_ * 2 + 1;
            this.lightAndBlocksShape = new BitSetDiscreteVoxelShape(i, i, i);
            this.lightShape = new BitSetDiscreteVoxelShape(i, i, i);

            for (int j = 0; j < i; j++) {
                for (int k = 0; k < i; k++) {
                    for (int l = 0; l < i; l++) {
                        SectionPos sectionpos = SectionPos.of(
                            p_282370_.x() + l - p_282804_, p_282370_.y() + k - p_282804_, p_282370_.z() + j - p_282804_
                        );
                        LayerLightSectionStorage.SectionType layerlightsectionstorage$sectiontype = p_283220_.getDebugSectionType(p_283151_, sectionpos);
                        if (layerlightsectionstorage$sectiontype == LayerLightSectionStorage.SectionType.LIGHT_AND_DATA) {
                            this.lightAndBlocksShape.fill(l, k, j);
                            this.lightShape.fill(l, k, j);
                        } else if (layerlightsectionstorage$sectiontype == LayerLightSectionStorage.SectionType.LIGHT_ONLY) {
                            this.lightShape.fill(l, k, j);
                        }
                    }
                }
            }

            this.minPos = SectionPos.of(p_282370_.x() - p_282804_, p_282370_.y() - p_282804_, p_282370_.z() - p_282804_);
        }
    }
}