Add TextureDump forge test mod

src/test/java/net/minecraftforge/debug/TextureDump.java

@@ -0,0 +1,82 @@
+package net.minecraftforge.debug;
+
+import java.awt.image.BufferedImage;
+import java.io.File;
+import java.io.IOException;
+import java.nio.IntBuffer;
+
+import javax.imageio.ImageIO;
+
+import net.minecraftforge.fml.common.FMLLog;
+import net.minecraftforge.fml.common.Mod;
+import net.minecraftforge.fml.common.event.FMLPreInitializationEvent;
+import net.minecraftforge.fml.common.eventhandler.SubscribeEvent;
+import org.lwjgl.BufferUtils;
+import org.lwjgl.opengl.GL11;
+import org.lwjgl.opengl.GL12;
+
+import net.minecraft.client.renderer.texture.TextureMap;
+import net.minecraftforge.client.event.TextureStitchEvent;
+import net.minecraftforge.common.MinecraftForge;
+
+@Mod(modid = TextureDump.MODID, name = "Forge Texture Atlas Dump", version = TextureDump.VERSION, clientSideOnly = true)
+public class TextureDump
+{
+	public static final String MODID = "forge_texture_dump";
+	public static final String VERSION = "1.0";
+
+	public static final boolean ENABLE = true;
+
+	@Mod.EventHandler
+	public void preInit(FMLPreInitializationEvent event)
+	{
+		if (ENABLE)
+		{
+			MinecraftForge.EVENT_BUS.register(this);
+		}
+	}
+
+	@SubscribeEvent
+	public void postTextureStitch(TextureStitchEvent.Post e) throws Exception
+	{
+		TextureMap map = e.getMap();
+		String name = map.getBasePath().replace('/', '_');
+		int mip = map.getMipmapLevels();
+		saveGlTexture(name, map.getGlTextureId(), mip);
+	}
+
+	public static void saveGlTexture(String name, int textureId, int mipmapLevels)
+	{
+		GL11.glBindTexture(GL11.GL_TEXTURE_2D, textureId);
+
+		GL11.glPixelStorei(GL11.GL_PACK_ALIGNMENT, 1);
+		GL11.glPixelStorei(GL11.GL_UNPACK_ALIGNMENT, 1);
+
+		for (int level = 0; level <= mipmapLevels; level++)
+		{
+			int width = GL11.glGetTexLevelParameteri(GL11.GL_TEXTURE_2D, level, GL11.GL_TEXTURE_WIDTH);
+			int height = GL11.glGetTexLevelParameteri(GL11.GL_TEXTURE_2D, level, GL11.GL_TEXTURE_HEIGHT);
+			int size = width * height;
+
+			BufferedImage bufferedimage = new BufferedImage(width, height, 2);
+			File output = new File("texture_atlas_dump_" + name + "_mipmap_" + level + ".png");
+
+			IntBuffer buffer = BufferUtils.createIntBuffer(size);
+			int[] data = new int[size];
+
+			GL11.glGetTexImage(GL11.GL_TEXTURE_2D, level, GL12.GL_BGRA, GL12.GL_UNSIGNED_INT_8_8_8_8_REV, buffer);
+			buffer.get(data);
+			bufferedimage.setRGB(0, 0, width, height, data, 0, width);
+
+			try
+			{
+				ImageIO.write(bufferedimage, "png", output);
+				FMLLog.info("[TextureDump] Exported png to: %s", output.getAbsolutePath());
+			}
+			catch (IOException ioexception)
+			{
+				FMLLog.info("[TextureDump] Unable to write: ", ioexception);
+			}
+		}
+	}
+}