001package cpw.mods.fml.client;
002
003import java.nio.ByteBuffer;
004
005import org.lwjgl.opengl.GL11;
006
007import net.minecraft.client.renderer.texture.Texture;
008import net.minecraft.client.renderer.texture.TextureStitched;
009
010public class CopySubimageTextureHelper extends TextureHelper {
011    @Override
012    public void doTextureCopy(Texture atlas, Texture source, int atlasX, int atlasY)
013    {
014        if (atlas.getGlTextureId() == -1)
015        {
016            return;
017        }
018        atlas.bindTexture(0);
019        ByteBuffer buffer = source.getTextureData();
020        buffer.position(0);
021        GL11.glTexSubImage2D(GL11.GL_TEXTURE_2D, 0, atlasX, atlasY, source.getWidth(), source.getHeight(), GL11.GL_RGBA, GL11.GL_UNSIGNED_BYTE, buffer);
022    }
023
024    @Override
025    public void doTextureUpload(TextureStitched source)
026    {
027        // NO OP for copysubimage
028    }
029
030}