minecraft-src/net/minecraft/client/renderer/blockentity/AbstractSignRenderer.java

package net.minecraft.client.renderer.blockentity;

import com.mojang.blaze3d.vertex.PoseStack;
import com.mojang.blaze3d.vertex.VertexConsumer;
import com.mojang.math.Axis;
import java.util.List;
import net.fabricmc.api.EnvType;
import net.fabricmc.api.Environment;
import net.minecraft.client.Minecraft;
import net.minecraft.client.gui.Font;
import net.minecraft.client.model.Model;
import net.minecraft.client.player.LocalPlayer;
import net.minecraft.client.renderer.MultiBufferSource;
import net.minecraft.client.resources.model.Material;
import net.minecraft.core.BlockPos;
import net.minecraft.util.ARGB;
import net.minecraft.util.FormattedCharSequence;
import net.minecraft.util.Mth;
import net.minecraft.world.entity.Entity;
import net.minecraft.world.item.DyeColor;
import net.minecraft.world.level.block.SignBlock;
import net.minecraft.world.level.block.entity.SignBlockEntity;
import net.minecraft.world.level.block.entity.SignText;
import net.minecraft.world.level.block.state.BlockState;
import net.minecraft.world.level.block.state.properties.WoodType;
import net.minecraft.world.phys.Vec3;

@Environment(EnvType.CLIENT)
public abstract class AbstractSignRenderer implements BlockEntityRenderer<SignBlockEntity> {
	private static final int BLACK_TEXT_OUTLINE_COLOR = -988212;
	private static final int OUTLINE_RENDER_DISTANCE = Mth.square(16);
	private final Font font;

	public AbstractSignRenderer(BlockEntityRendererProvider.Context context) {
		this.font = context.getFont();
	}

	protected abstract Model getSignModel(BlockState state, WoodType woodType);

	protected abstract Material getSignMaterial(WoodType woodType);

	protected abstract float getSignModelRenderScale();

	protected abstract float getSignTextRenderScale();

	protected abstract Vec3 getTextOffset();

	protected abstract void translateSign(PoseStack poseStack, float yRot, BlockState state);

	public void render(
		SignBlockEntity blockEntity, float partialTick, PoseStack poseStack, MultiBufferSource bufferSource, int packedLight, int packedOverlay, Vec3 cameraPos
	) {
		BlockState blockState = blockEntity.getBlockState();
		SignBlock signBlock = (SignBlock)blockState.getBlock();
		Model model = this.getSignModel(blockState, signBlock.type());
		this.renderSignWithText(blockEntity, poseStack, bufferSource, packedLight, packedOverlay, blockState, signBlock, signBlock.type(), model);
	}

	private void renderSignWithText(
		SignBlockEntity blockEntity,
		PoseStack poseStack,
		MultiBufferSource bufferSource,
		int packedLight,
		int packedOverlay,
		BlockState state,
		SignBlock sign,
		WoodType woodType,
		Model model
	) {
		poseStack.pushPose();
		this.translateSign(poseStack, -sign.getYRotationDegrees(state), state);
		this.renderSign(poseStack, bufferSource, packedLight, packedOverlay, woodType, model);
		this.renderSignText(
			blockEntity.getBlockPos(),
			blockEntity.getFrontText(),
			poseStack,
			bufferSource,
			packedLight,
			blockEntity.getTextLineHeight(),
			blockEntity.getMaxTextLineWidth(),
			true
		);
		this.renderSignText(
			blockEntity.getBlockPos(),
			blockEntity.getBackText(),
			poseStack,
			bufferSource,
			packedLight,
			blockEntity.getTextLineHeight(),
			blockEntity.getMaxTextLineWidth(),
			false
		);
		poseStack.popPose();
	}

	protected void renderSign(PoseStack poseStack, MultiBufferSource bufferSource, int packedLight, int packedOverlay, WoodType woodType, Model model) {
		poseStack.pushPose();
		float f = this.getSignModelRenderScale();
		poseStack.scale(f, -f, -f);
		Material material = this.getSignMaterial(woodType);
		VertexConsumer vertexConsumer = material.buffer(bufferSource, model::renderType);
		model.renderToBuffer(poseStack, vertexConsumer, packedLight, packedOverlay);
		poseStack.popPose();
	}

	private void renderSignText(
		BlockPos pos, SignText text, PoseStack poseStack, MultiBufferSource bufferSource, int packedLight, int lineHeight, int maxLineWidth, boolean isFront
	) {
		poseStack.pushPose();
		this.translateSignText(poseStack, isFront, this.getTextOffset());
		int i = getDarkColor(text);
		int j = 4 * lineHeight / 2;
		FormattedCharSequence[] formattedCharSequences = text.getRenderMessages(Minecraft.getInstance().isTextFilteringEnabled(), component -> {
			List<FormattedCharSequence> list = this.font.split(component, maxLineWidth);
			return list.isEmpty() ? FormattedCharSequence.EMPTY : (FormattedCharSequence)list.get(0);
		});
		int k;
		boolean bl;
		int l;
		if (text.hasGlowingText()) {
			k = text.getColor().getTextColor();
			bl = isOutlineVisible(pos, k);
			l = 15728880;
		} else {
			k = i;
			bl = false;
			l = packedLight;
		}

		for (int m = 0; m < 4; m++) {
			FormattedCharSequence formattedCharSequence = formattedCharSequences[m];
			float f = -this.font.width(formattedCharSequence) / 2;
			if (bl) {
				this.font.drawInBatch8xOutline(formattedCharSequence, f, m * lineHeight - j, k, i, poseStack.last().pose(), bufferSource, l);
			} else {
				this.font
					.drawInBatch(formattedCharSequence, f, (float)(m * lineHeight - j), k, false, poseStack.last().pose(), bufferSource, Font.DisplayMode.POLYGON_OFFSET, 0, l);
			}
		}

		poseStack.popPose();
	}

	private void translateSignText(PoseStack poseStack, boolean isFront, Vec3 offset) {
		if (!isFront) {
			poseStack.mulPose(Axis.YP.rotationDegrees(180.0F));
		}

		float f = 0.015625F * this.getSignTextRenderScale();
		poseStack.translate(offset);
		poseStack.scale(f, -f, f);
	}

	private static boolean isOutlineVisible(BlockPos pos, int color) {
		if (color == DyeColor.BLACK.getTextColor()) {
			return true;
		} else {
			Minecraft minecraft = Minecraft.getInstance();
			LocalPlayer localPlayer = minecraft.player;
			if (localPlayer != null && minecraft.options.getCameraType().isFirstPerson() && localPlayer.isScoping()) {
				return true;
			} else {
				Entity entity = minecraft.getCameraEntity();
				return entity != null && entity.distanceToSqr(Vec3.atCenterOf(pos)) < OUTLINE_RENDER_DISTANCE;
			}
		}
	}

	public static int getDarkColor(SignText text) {
		int i = text.getColor().getTextColor();
		return i == DyeColor.BLACK.getTextColor() && text.hasGlowingText() ? -988212 : ARGB.scaleRGB(i, 0.4F);
	}
}