[glx] Make the wait_for_vblank function private

Nobody should be using the function to wait for the vblank outside
of the GLX backend.

clutter/glx/clutter-backend-glx.c

@@ -476,6 +476,65 @@ clutter_backend_glx_ensure_context (ClutterBackend *backend,
     }
 }
 
+static void
+glx_wait_for_vblank (ClutterBackendGLX *backend_glx)
+{
+  /* If we are going to wait for VBLANK manually, we not only need
+   * to flush out pending drawing to the GPU before we sleep, we
+   * need to wait for it to finish. Otherwise, we may end up with
+   * the situation:
+   *
+   *        - We finish drawing      - GPU drawing continues
+   *        - We go to sleep         - GPU drawing continues
+   * VBLANK - We call glXSwapBuffers - GPU drawing continues
+   *                                 - GPU drawing continues
+   *                                 - Swap buffers happens
+   *
+   * Producing a tear. Calling glFinish() first will cause us to properly
+   * wait for the next VBLANK before we swap. This obviously does not
+   * happen when we use GLX_SWAP and let the driver do the right thing
+   */
+
+  switch (backend_glx->vblank_type)
+    {
+    case CLUTTER_VBLANK_GLX_SWAP:
+      /* Nothing */
+      break;
+
+    case CLUTTER_VBLANK_GLX:
+      {
+        unsigned int retraceCount;
+
+        glFinish ();
+
+        backend_glx->get_video_sync (&retraceCount);
+        backend_glx->wait_video_sync (2,
+                                      (retraceCount + 1) % 2,
+                                      &retraceCount);
+      }
+      break;
+
+    case CLUTTER_VBLANK_DRI:
+#ifdef __linux__
+      {
+        drm_wait_vblank_t blank;
+
+        glFinish ();
+
+        blank.request.type     = DRM_VBLANK_RELATIVE;
+        blank.request.sequence = 1;
+        blank.request.signal   = 0;
+        drm_wait_vblank (backend_glx->dri_fd, &blank);
+      }
+#endif
+      break;
+
+    case CLUTTER_VBLANK_NONE:
+    default:
+      break;
+    }
+}
+
 static void
 clutter_backend_glx_redraw (ClutterBackend *backend,
                             ClutterStage   *stage)
@@ -504,7 +563,7 @@ clutter_backend_glx_redraw (ClutterBackend *backend,
     {
       /* wait for the next vblank */
       CLUTTER_NOTE (BACKEND, "Waiting for vblank");
-      clutter_backend_glx_wait_for_vblank (CLUTTER_BACKEND_GLX (backend));
+      glx_wait_for_vblank (CLUTTER_BACKEND_GLX (backend));
 
       /* push on the screen */
       CLUTTER_NOTE (BACKEND, "glXSwapBuffers (display: %p, window: 0x%lx)",
@@ -633,62 +692,3 @@ _clutter_backend_impl_get_type (void)
 {
   return clutter_backend_glx_get_type ();
 }
-
-void
-clutter_backend_glx_wait_for_vblank (ClutterBackendGLX *backend_glx)
-{
-  /* If we are going to wait for VBLANK manually, we not only need
-   * to flush out pending drawing to the GPU before we sleep, we
-   * need to wait for it to finish. Otherwise, we may end up with
-   * the situation:
-   *
-   *        - We finish drawing      - GPU drawing continues
-   *        - We go to sleep         - GPU drawing continues
-   * VBLANK - We call glXSwapBuffers - GPU drawing continues
-   *                                 - GPU drawing continues
-   *                                 - Swap buffers happens
-   *
-   * Producing a tear. Calling glFinish() first will cause us to properly
-   * wait for the next VBLANK before we swap. This obviously does not
-   * happen when we use GLX_SWAP and let the driver do the right thing
-   */
-
-  switch (backend_glx->vblank_type)
-    {
-    case CLUTTER_VBLANK_GLX_SWAP:
-      /* Nothing */
-      break;
-
-    case CLUTTER_VBLANK_GLX:
-      {
-        unsigned int retraceCount;
-
-        glFinish ();
-
-        backend_glx->get_video_sync (&retraceCount);
-        backend_glx->wait_video_sync (2, 
-                                      (retraceCount + 1) % 2,
-                                      &retraceCount); 
-      }
-      break;
-
-    case CLUTTER_VBLANK_DRI:
-#ifdef __linux__
-      {
-        drm_wait_vblank_t blank;
-
-        glFinish ();
-
-        blank.request.type     = DRM_VBLANK_RELATIVE;
-        blank.request.sequence = 1;
-        blank.request.signal   = 0;
-        drm_wait_vblank (backend_glx->dri_fd, &blank);
-      }
-#endif
-      break;
-
-    case CLUTTER_VBLANK_NONE:
-    default:
-      break;
-    }
-}

clutter/glx/clutter-backend-glx.h

@@ -45,13 +45,11 @@ G_BEGIN_DECLS
 typedef struct _ClutterBackendGLX       ClutterBackendGLX;
 typedef struct _ClutterBackendGLXClass  ClutterBackendGLXClass;
 
-typedef enum ClutterGLXVBlankType
+typedef enum ClutterGLXVBlankType {
-{
   CLUTTER_VBLANK_NONE = 0,
   CLUTTER_VBLANK_GLX_SWAP,
   CLUTTER_VBLANK_GLX,
   CLUTTER_VBLANK_DRI
-
 } ClutterGLXVBlankType;
 
 typedef int (*GetVideoSyncProc)  (unsigned int *count);
@@ -84,8 +82,6 @@ struct _ClutterBackendGLXClass
   ClutterBackendX11Class parent_class;
 };
 
-void  clutter_backend_glx_wait_for_vblank (ClutterBackendGLX *backend_glx);
-
 GType clutter_backend_glx_get_type (void) G_GNUC_CONST;
 
 G_END_DECLS