func (c *newScreenFramebufferImageCommand) Exec(context *opengl.Context, indexOffsetInBytes int) error {
if c.width < 1 {
return errors.New("graphics: width must be equal or more than 1.")
}
if c.height < 1 {
return errors.New("graphics: height must be equal or more than 1.")
}
f := &framebuffer{
native: context.ScreenFramebuffer(),
flipY: true,
}
c.result.framebuffer = f
return nil
}