- HDC hdc = (HDC)context_private;
- struct stw_framebuffer *fb;
-
- fb = stw_framebuffer_from_hdc( hdc );
- if (!fb) {
- /* fb can be NULL if window was destroyed already */
- return;
- }
-
-#if DEBUG
- {
- /* ensure that a random surface was not passed to us */
- struct pipe_surface *surface2;
-
- if(!st_get_framebuffer_surface( fb->stfb, ST_SURFACE_FRONT_LEFT, &surface2 ))
- assert(0);
- else
- assert(surface2 == surface);
+ switch (param) {
+ case ST_MANAGER_BROKEN_INVALIDATE:
+ /*
+ * Force framebuffer validation on glViewport.
+ *
+ * Certain applications, like Rhinoceros 4, uses glReadPixels
+ * exclusively (never uses SwapBuffers), so framebuffers never get
+ * resized unless we check on glViewport.
+ */
+ return 1;
+ default:
+ return 0;