void read(ByteBuffer buffer) {
   EXTFramebufferObject.glBindFramebufferEXT(
       EXTFramebufferObject.GL_FRAMEBUFFER_EXT, frameBuffer);
   buffer.position(0);
   GL11.glReadPixels(
       x0, y0, width, height, MipmapHelper.TEX_FORMAT, MipmapHelper.TEX_DATA_TYPE, buffer);
 }