st_ws_framebuffer(struct gl_framebuffer *fb)
{
/* FBO cannot be casted. See st_new_framebuffer */
- return (struct st_framebuffer *) ((fb && !fb->Name) ? fb : NULL);
+ if (fb && _mesa_is_winsys_fbo(fb))
+ return (struct st_framebuffer *) fb;
+ return NULL;
}
static void st_viewport(struct gl_context * ctx, GLint x, GLint y,