3 files changed, 8 insertions, 3 deletions
diff --git a/src/mesa/state_tracker/st_cb_viewport.c b/src/mesa/state_tracker/st_cb_viewport.c
index d4742eb897d..d654ed6e771 100644
--- a/src/mesa/state_tracker/st_cb_viewport.c
+++ b/src/mesa/state_tracker/st_cb_viewport.c
@@ -43,7 +43,9 @@ static INLINE struct st_framebuffer *
 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,
diff --git a/src/mesa/state_tracker/st_context.h b/src/mesa/state_tracker/st_context.h
index be8fef189ef..cdac5a1c7c9 100644
--- a/src/mesa/state_tracker/st_context.h
+++ b/src/mesa/state_tracker/st_context.h
@@ -31,6 +31,7 @@
 #include "main/mtypes.h"
 #include "pipe/p_state.h"
 #include "state_tracker/st_api.h"
+#include "main/fbobject.h"
 
 struct bitmap_cache;
 struct blit_state;
@@ -238,7 +239,7 @@ void st_invalidate_state(struct gl_context * ctx, GLuint new_state);
 static INLINE GLuint
 st_fb_orientation(const struct gl_framebuffer *fb)
 {
-   if (fb && fb->Name == 0) {
+   if (fb && _mesa_is_winsys_fbo(fb)) {
       /* Drawing into a window (on-screen buffer).
        *
        * Negate Y scale to flip image vertically.
diff --git a/src/mesa/state_tracker/st_manager.c b/src/mesa/state_tracker/st_manager.c
index 748624f3d94..875e0c44ac1 100644
--- a/src/mesa/state_tracker/st_manager.c
+++ b/src/mesa/state_tracker/st_manager.c
@@ -64,7 +64,9 @@ static INLINE struct st_framebuffer *
 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;
 }
 
 /**