PrettyPipes/src/main/java/de/ellpeck/prettypipes/pipe/PipeRenderer.java

package de.ellpeck.prettypipes.pipe;

import com.mojang.blaze3d.vertex.PoseStack;
import net.minecraft.client.Minecraft;
import net.minecraft.client.renderer.MultiBufferSource;
import net.minecraft.client.renderer.blockentity.BlockEntityRenderer;
import net.minecraft.client.renderer.blockentity.BlockEntityRendererProvider;
import net.minecraft.util.RandomSource;
import net.minecraft.world.phys.AABB;
import net.neoforged.neoforge.client.model.data.ModelData;

import java.util.Random;

public class PipeRenderer implements BlockEntityRenderer<PipeBlockEntity> {

    private final Random random = new Random();

    public PipeRenderer(BlockEntityRendererProvider.Context ctx) {
    }

    @Override
    public void render(PipeBlockEntity tile, float partialTicks, PoseStack matrixStack, MultiBufferSource source, int light, int overlay) {
        if (!tile.getItems().isEmpty()) {
            matrixStack.pushPose();
            var tilePos = tile.getBlockPos();
            matrixStack.translate(-tilePos.getX(), -tilePos.getY(), -tilePos.getZ());
            for (var item : tile.getItems()) {
                matrixStack.pushPose();
                item.render(tile, matrixStack, this.random, partialTicks, light, overlay, source);
                matrixStack.popPose();
            }
            matrixStack.popPose();
        }
        if (tile.cover != null) {
            matrixStack.pushPose();
            var renderer = Minecraft.getInstance().getBlockRenderer();
            var model = renderer.getBlockModel(tile.cover);
            for (var layer : model.getRenderTypes(tile.cover, RandomSource.create(tile.cover.getSeed(tile.getBlockPos())), ModelData.EMPTY)) {
                renderer.getModelRenderer().tesselateBlock(tile.getLevel(), model, tile.cover, tile.getBlockPos(), matrixStack, source.getBuffer(layer), true, RandomSource.create(), tile.cover.getSeed(tile.getBlockPos()), overlay, ModelData.EMPTY, layer);
            }
            matrixStack.popPose();
        }
    }

    @Override
    public AABB getRenderBoundingBox(PipeBlockEntity blockEntity) {
        // our render bounding box should always be the full block in case we're covered
        return new AABB(blockEntity.getBlockPos());
    }

}