void GLES2FBOMultiRenderTarget::bindSurfaceImpl(size_t attachment, RenderTexture *target)
	{
		/// Check if the render target is in the rendertarget->FBO map
        GLES2FrameBufferObject *fbobj = 0;
        target->getCustomAttribute("FBO", &fbobj);
		assert(fbobj);
		fbo.bindSurface(attachment, fbobj->getSurface(0));
        GL_CHECK_ERROR;

		// Initialise?

		// Set width and height
		mWidth = fbo.getWidth();
		mHeight = fbo.getHeight();
	}