kms: Make result listener take a vtable too

As with the page flip listener, prepare to make result listeners more
capable by allowing more vfuncs for the same listener instance in the
future.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2777>

src/backends/native/meta-cursor-renderer-native.c

@@ -136,7 +136,7 @@ static GQuark quark_cursor_renderer_native_gpu_data = 0;
 G_DEFINE_TYPE_WITH_PRIVATE (MetaCursorRendererNative, meta_cursor_renderer_native, META_TYPE_CURSOR_RENDERER);
 
 static void
-on_kms_update_result (const MetaKmsFeedback *kms_feedback,
+kms_update_feedback_result (const MetaKmsFeedback *kms_feedback,
                             gpointer               user_data);
 
 static void
@@ -281,6 +281,10 @@ ensure_crtc_cursor_data (MetaCrtcKms *crtc_kms)
   return crtc_cursor_data;
 }
 
+static const MetaKmsResultListenerVtable kms_update_listener_vtable = {
+  .feedback = kms_update_feedback_result,
+};
+
 static void
 assign_cursor_plane (MetaCursorRendererNative *native,
                      ClutterFrame             *frame,
@@ -361,8 +365,8 @@ assign_cursor_plane (MetaCursorRendererNative *native,
                                                 cursor_hotspot_y);
 
   meta_kms_update_add_result_listener (kms_update,
+                                       &kms_update_listener_vtable,
                                        NULL,
-                                       on_kms_update_result,
                                        native);
 
   crtc_cursor_data->buffer = buffer;
@@ -1019,7 +1023,7 @@ calculate_cursor_sprite_gpus (MetaCursorRenderer *renderer,
 }
 
 static void
-on_kms_update_result (const MetaKmsFeedback *kms_feedback,
+kms_update_feedback_result (const MetaKmsFeedback *kms_feedback,
                             gpointer               user_data)
 {
   MetaCursorRendererNative *cursor_renderer_native = user_data;

src/backends/native/meta-kms-update-private.h

@@ -129,7 +129,7 @@ typedef struct _MetaKmsPageFlipListener
 struct _MetaKmsResultListener
 {
   GMainContext *main_context;
-  MetaKmsResultListenerFunc func;
+  const MetaKmsResultListenerVtable *vtable;
   gpointer user_data;
 
   MetaKmsFeedback *feedback;

src/backends/native/meta-kms-update.c

@@ -597,8 +597,8 @@ meta_kms_plane_assignment_set_cursor_hotspot (MetaKmsPlaneAssignment *plane_assi
 
 void
 meta_kms_update_add_result_listener (MetaKmsUpdate                     *update,
+                                     const MetaKmsResultListenerVtable *vtable,
                                      GMainContext                      *main_context,
-                                     MetaKmsResultListenerFunc  func,
                                      gpointer                           user_data)
 {
   MetaKmsResultListener *listener;
@@ -606,7 +606,7 @@ meta_kms_update_add_result_listener (MetaKmsUpdate             *update,
   listener = g_new0 (MetaKmsResultListener, 1);
   *listener = (MetaKmsResultListener) {
     .main_context = main_context,
-    .func = func,
+    .vtable = vtable,
     .user_data = user_data,
   };
 
@@ -640,7 +640,8 @@ meta_kms_result_listener_notify (MetaKmsResultListener *listener)
 {
   g_return_if_fail (listener->feedback);
 
-  listener->func (listener->feedback, listener->user_data);
+  if (listener->vtable->feedback)
+    listener->vtable->feedback (listener->feedback, listener->user_data);
 }
 
 void

src/backends/native/meta-kms-update.h

@@ -78,8 +78,11 @@ typedef struct _MetaKmsPlaneFeedback
   GError *error;
 } MetaKmsPlaneFeedback;
 
-typedef void (* MetaKmsResultListenerFunc) (const MetaKmsFeedback *feedback,
+typedef struct _MetaKmsResultListenerVtable
+{
+  void (* feedback) (const MetaKmsFeedback *feedback,
                      gpointer               user_data);
+} MetaKmsResultListenerVtable;
 
 MetaKmsFeedback * meta_kms_feedback_ref (MetaKmsFeedback *feedback);
 
@@ -184,8 +187,8 @@ void meta_kms_plane_assignment_set_cursor_hotspot (MetaKmsPlaneAssignment *plane
 
 META_EXPORT_TEST
 void meta_kms_update_add_result_listener (MetaKmsUpdate                     *update,
+                                          const MetaKmsResultListenerVtable *vtable,
                                           GMainContext                      *main_context,
-                                          MetaKmsResultListenerFunc  func,
                                           gpointer                           user_data);
 
 META_EXPORT_TEST

src/backends/native/meta-onscreen-native.c

@@ -1017,7 +1017,7 @@ ensure_crtc_modes (CoglOnscreen  *onscreen,
 }
 
 static void
-on_swap_buffer_update_result (const MetaKmsFeedback *kms_feedback,
+swap_buffer_result_feedback (const MetaKmsFeedback *kms_feedback,
                              gpointer               user_data)
 {
   CoglOnscreen *onscreen = COGL_ONSCREEN (user_data);
@@ -1045,6 +1045,10 @@ on_swap_buffer_update_result (const MetaKmsFeedback *kms_feedback,
   meta_onscreen_native_clear_next_fb (onscreen);
 }
 
+static const MetaKmsResultListenerVtable swap_buffer_result_listener_vtable = {
+  .feedback = swap_buffer_result_feedback,
+};
+
 static void
 meta_onscreen_native_swap_buffers_with_damage (CoglOnscreen  *onscreen,
                                                const int     *rectangles,
@@ -1170,8 +1174,8 @@ meta_onscreen_native_swap_buffers_with_damage (CoglOnscreen  *onscreen,
       kms_update = meta_frame_native_ensure_kms_update (frame_native,
                                                         kms_device);
       meta_kms_update_add_result_listener (kms_update,
+                                           &swap_buffer_result_listener_vtable,
                                            NULL,
-                                           on_swap_buffer_update_result,
                                            onscreen_native);
 
       ensure_crtc_modes (onscreen, kms_update);
@@ -1294,7 +1298,7 @@ meta_onscreen_native_is_buffer_scanout_compatible (CoglOnscreen  *onscreen,
 }
 
 static void
-on_scanout_update_result (const MetaKmsFeedback *kms_feedback,
+scanout_result_feedback (const MetaKmsFeedback *kms_feedback,
                          gpointer               user_data)
 {
   MetaOnscreenNative *onscreen_native = META_ONSCREEN_NATIVE (user_data);
@@ -1327,6 +1331,10 @@ on_scanout_update_result (const MetaKmsFeedback *kms_feedback,
   meta_onscreen_native_clear_next_fb (onscreen);
 }
 
+static const MetaKmsResultListenerVtable scanout_result_listener_vtable = {
+  .feedback = scanout_result_feedback,
+};
+
 static gboolean
 meta_onscreen_native_direct_scanout (CoglOnscreen   *onscreen,
                                      CoglScanout    *scanout,
@@ -1387,8 +1395,8 @@ meta_onscreen_native_direct_scanout (CoglOnscreen   *onscreen,
   kms_update = meta_frame_native_ensure_kms_update (frame_native, kms_device);
 
   meta_kms_update_add_result_listener (kms_update,
+                                       &scanout_result_listener_vtable,
                                        NULL,
-                                       on_scanout_update_result,
                                        onscreen_native);
 
   meta_onscreen_native_flip_crtc (onscreen,
@@ -1498,7 +1506,7 @@ meta_onscreen_native_prepare_frame (CoglOnscreen *onscreen,
 }
 
 static void
-on_finish_frame_update_result (const MetaKmsFeedback *kms_feedback,
+finish_frame_result_feedback (const MetaKmsFeedback *kms_feedback,
                               gpointer               user_data)
 {
   CoglOnscreen *onscreen = COGL_ONSCREEN (user_data);
@@ -1520,6 +1528,10 @@ on_finish_frame_update_result (const MetaKmsFeedback *kms_feedback,
   meta_onscreen_native_notify_frame_complete (onscreen);
 }
 
+static const MetaKmsResultListenerVtable finish_frame_result_listener_vtable = {
+  .feedback = finish_frame_result_feedback,
+};
+
 void
 meta_onscreen_native_finish_frame (CoglOnscreen *onscreen,
                                    ClutterFrame *frame)
@@ -1539,8 +1551,8 @@ meta_onscreen_native_finish_frame (CoglOnscreen *onscreen,
     }
 
   meta_kms_update_add_result_listener (kms_update,
+                                       &finish_frame_result_listener_vtable,
                                        NULL,
-                                       on_finish_frame_update_result,
                                        onscreen_native);
 
   meta_kms_update_add_page_flip_listener (kms_update,

src/backends/native/meta-renderer-native.c

@@ -836,7 +836,7 @@ clear_detached_onscreens (MetaRendererNative *renderer_native)
 }
 
 static void
-on_mode_sets_update_result (const MetaKmsFeedback *kms_feedback,
+mode_sets_update_result_feedback (const MetaKmsFeedback *kms_feedback,
                                   gpointer               user_data)
 {
   const GError *feedback_error;
@@ -849,6 +849,10 @@ on_mode_sets_update_result (const MetaKmsFeedback *kms_feedback,
     g_warning ("Failed to post KMS update: %s", feedback_error->message);
 }
 
+static const MetaKmsResultListenerVtable mode_sets_result_listener_vtable = {
+  .feedback = mode_sets_update_result_feedback,
+};
+
 static void
 post_mode_set_updates (MetaRendererNative *renderer_native)
 {
@@ -865,8 +869,8 @@ post_mode_set_updates (MetaRendererNative *renderer_native)
       g_hash_table_iter_steal (&iter);
 
       meta_kms_update_add_result_listener (kms_update,
+                                           &mode_sets_result_listener_vtable,
                                            NULL,
-                                           on_mode_sets_update_result,
                                            NULL);
 
       feedback = meta_kms_device_process_update_sync (kms_device, kms_update,

src/tests/native-kms-render.c

@@ -330,7 +330,7 @@ needs_repainted_guard (gpointer user_data)
 }
 
 static void
-on_scanout_fallback_result (const MetaKmsFeedback *kms_feedback,
+scanout_fallback_result_feedback (const MetaKmsFeedback *kms_feedback,
                                   gpointer               user_data)
 {
   KmsRenderingTest *test = user_data;
@@ -342,6 +342,10 @@ on_scanout_fallback_result (const MetaKmsFeedback *kms_feedback,
     g_idle_add_full (G_PRIORITY_LOW, needs_repainted_guard, test, NULL);
 }
 
+static const MetaKmsResultListenerVtable scanout_fallback_result_listener_vtable = {
+  .feedback = scanout_fallback_result_feedback,
+};
+
 static void
 on_scanout_fallback_before_paint (ClutterStage     *stage,
                                   ClutterStageView *stage_view,
@@ -376,8 +380,9 @@ on_scanout_fallback_before_paint (ClutterStage     *stage,
 
   kms_update = meta_frame_native_ensure_kms_update (frame_native, kms_device);
   meta_kms_update_add_result_listener (kms_update,
+                                       &scanout_fallback_result_listener_vtable,
                                        NULL,
-                                       on_scanout_fallback_result, test);
+                                       test);
 
   test->scanout_fallback.scanout_failed_view = stage_view;
 }

src/tests/native-kms-updates.c

@@ -777,7 +777,7 @@ off_thread_callback_thread_func (gpointer user_data)
 }
 
 static void
-on_main_thread_result (const MetaKmsFeedback *feedback,
+main_thread_result_feedback (const MetaKmsFeedback *feedback,
                              gpointer               user_data)
 {
   CallbackData *data = user_data;
@@ -785,8 +785,12 @@ on_main_thread_result (const MetaKmsFeedback *feedback,
   g_main_loop_quit (data->main_thread_loop);
 }
 
+static const MetaKmsResultListenerVtable main_thread_result_listener_vtable = {
+  .feedback = main_thread_result_feedback,
+};
+
 static void
-on_callback_thread_result (const MetaKmsFeedback *feedback,
+callback_thread_result_feedback (const MetaKmsFeedback *feedback,
                                  gpointer               user_data)
 {
   CallbackData *data = user_data;
@@ -794,6 +798,10 @@ on_callback_thread_result (const MetaKmsFeedback *feedback,
   g_main_loop_quit (data->thread_loop);
 }
 
+static const MetaKmsResultListenerVtable callback_thread_result_listener_vtable = {
+  .feedback = callback_thread_result_feedback,
+};
+
 static void
 meta_test_kms_update_feedback (void)
 {
@@ -819,11 +827,13 @@ meta_test_kms_update_feedback (void)
   update = meta_kms_update_new (device);
   populate_update (update, &buffer, POPULATE_UPDATE_FLAG_MODE);
 
-  meta_kms_update_add_result_listener (update, NULL,
+  meta_kms_update_add_result_listener (update,
-                                       on_main_thread_result,
+                                       &main_thread_result_listener_vtable,
+                                       NULL,
                                        &data);
-  meta_kms_update_add_result_listener (update, data.thread_main_context,
+  meta_kms_update_add_result_listener (update,
-                                       on_callback_thread_result,
+                                       &callback_thread_result_listener_vtable,
+                                       data.thread_main_context,
                                        &data);
 
   meta_kms_device_post_update (device, update,