src/game/java/com/mojang/blaze3d/platform/TextureUtil.java

package com.mojang.blaze3d.platform;

import com.mojang.blaze3d.DontObfuscate;
import com.mojang.blaze3d.systems.RenderSystem;
import com.mojang.logging.LogUtils;
import java.io.IOException;
import java.io.InputStream;
import java.nio.ByteBuffer;
import java.nio.channels.Channels;
import java.nio.channels.ReadableByteChannel;
import java.nio.channels.SeekableByteChannel;
import java.nio.file.Path;
import java.util.concurrent.ThreadLocalRandom;
import java.util.function.IntUnaryOperator;
import javax.annotation.Nullable;
import net.minecraft.SharedConstants;
import net.minecraftforge.api.distmarker.Dist;
import net.minecraftforge.api.distmarker.OnlyIn;
import org.lwjgl.system.MemoryUtil;
import org.slf4j.Logger;

@OnlyIn(Dist.CLIENT)
@DontObfuscate
public class TextureUtil {
    private static final Logger LOGGER = LogUtils.getLogger();
    public static final int MIN_MIPMAP_LEVEL = 0;
    private static final int DEFAULT_IMAGE_BUFFER_SIZE = 8192;

    public static int generateTextureId() {
        RenderSystem.assertOnRenderThreadOrInit();
        if (SharedConstants.IS_RUNNING_IN_IDE) {
            int[] aint = new int[ThreadLocalRandom.current().nextInt(15) + 1];
            GlStateManager._genTextures(aint);
            int i = GlStateManager._genTexture();
            GlStateManager._deleteTextures(aint);
            return i;
        } else {
            return GlStateManager._genTexture();
        }
    }

    public static void releaseTextureId(int p_85282_) {
        RenderSystem.assertOnRenderThreadOrInit();
        GlStateManager._deleteTexture(p_85282_);
    }

    public static void prepareImage(int p_85284_, int p_85285_, int p_85286_) {
        prepareImage(NativeImage.InternalGlFormat.RGBA, p_85284_, 0, p_85285_, p_85286_);
    }

    public static void prepareImage(NativeImage.InternalGlFormat p_85293_, int p_85294_, int p_85295_, int p_85296_) {
        prepareImage(p_85293_, p_85294_, 0, p_85295_, p_85296_);
    }

    public static void prepareImage(int p_85288_, int p_85289_, int p_85290_, int p_85291_) {
        prepareImage(NativeImage.InternalGlFormat.RGBA, p_85288_, p_85289_, p_85290_, p_85291_);
    }

    public static void prepareImage(NativeImage.InternalGlFormat p_85298_, int p_85299_, int p_85300_, int p_85301_, int p_85302_) {
        RenderSystem.assertOnRenderThreadOrInit();
        bind(p_85299_);
        if (p_85300_ >= 0) {
            GlStateManager._texParameter(3553, 33085, p_85300_);
            GlStateManager._texParameter(3553, 33082, 0);
            GlStateManager._texParameter(3553, 33083, p_85300_);
            GlStateManager._texParameter(3553, 34049, 0.0F);
        }

        for (int i = 0; i <= p_85300_; i++) {
            GlStateManager._texImage2D(3553, i, p_85298_.glFormat(), p_85301_ >> i, p_85302_ >> i, 0, 6408, 5121, null);
        }
    }

    private static void bind(int p_85310_) {
        RenderSystem.assertOnRenderThreadOrInit();
        GlStateManager._bindTexture(p_85310_);
    }

    public static ByteBuffer readResource(InputStream p_85304_) throws IOException {
        ReadableByteChannel readablebytechannel = Channels.newChannel(p_85304_);
        return readablebytechannel instanceof SeekableByteChannel seekablebytechannel
            ? readResource(readablebytechannel, (int)seekablebytechannel.size() + 1)
            : readResource(readablebytechannel, 8192);
    }

    private static ByteBuffer readResource(ReadableByteChannel p_273208_, int p_273297_) throws IOException {
        ByteBuffer bytebuffer = MemoryUtil.memAlloc(p_273297_);

        try {
            while (p_273208_.read(bytebuffer) != -1) {
                if (!bytebuffer.hasRemaining()) {
                    bytebuffer = MemoryUtil.memRealloc(bytebuffer, bytebuffer.capacity() * 2);
                }
            }

            return bytebuffer;
        } catch (IOException ioexception) {
            MemoryUtil.memFree(bytebuffer);
            throw ioexception;
        }
    }

    public static void writeAsPNG(Path p_261923_, String p_262070_, int p_261655_, int p_261576_, int p_261966_, int p_261775_) {
        writeAsPNG(p_261923_, p_262070_, p_261655_, p_261576_, p_261966_, p_261775_, null);
    }

    public static void writeAsPNG(
        Path p_285286_, String p_285408_, int p_285400_, int p_285244_, int p_285373_, int p_285206_, @Nullable IntUnaryOperator p_284988_
    ) {
        RenderSystem.assertOnRenderThread();
        bind(p_285400_);

        for (int i = 0; i <= p_285244_; i++) {
            int j = p_285373_ >> i;
            int k = p_285206_ >> i;

            try (NativeImage nativeimage = new NativeImage(j, k, false)) {
                nativeimage.downloadTexture(i, false);
                if (p_284988_ != null) {
                    nativeimage.applyToAllPixels(p_284988_);
                }

                Path path = p_285286_.resolve(p_285408_ + "_" + i + ".png");
                nativeimage.writeToFile(path);
                LOGGER.debug("Exported png to: {}", path.toAbsolutePath());
            } catch (IOException ioexception) {
                LOGGER.debug("Unable to write: ", (Throwable)ioexception);
            }
        }
    }

    public static Path getDebugTexturePath(Path p_262015_) {
        return p_262015_.resolve("screenshots").resolve("debug");
    }

    public static Path getDebugTexturePath() {
        return getDebugTexturePath(Path.of("."));
    }
}