[mutter/wip/texture-purge-on-nvidia: 61/66] backend/native: Add frame clock inhibitation API

[Ray Strode <halfline src gnome org>]

commit 59448e21be9973680fccdde9b288fcf8110c13d5
Author: Jonas Ådahl <jadahl gmail com>
Date:   Wed Jan 2 12:40:07 2019 +0100

    backend/native: Add frame clock inhibitation API
    
    Add a counting clutter master frame clock inhibitation API so that multiple
    users can inhibit/uninhibit the master frame clock.

 src/backends/native/meta-backend-native.c | 30 ++++++++++++++++++++++++++++--
 src/backends/native/meta-backend-native.h |  4 ++++
 2 files changed, 32 insertions(+), 2 deletions(-)
---
diff --git a/src/backends/native/meta-backend-native.c b/src/backends/native/meta-backend-native.c
index 042d96ec6..0f6a00248 100644
--- a/src/backends/native/meta-backend-native.c
+++ b/src/backends/native/meta-backend-native.c
@@ -60,6 +60,8 @@ struct _MetaBackendNativePrivate
 {
   MetaLauncher *launcher;
   MetaBarrierManagerNative *barrier_manager;
+
+  int frame_freeze_count;
 };
 typedef struct _MetaBackendNativePrivate MetaBackendNativePrivate;
 
@@ -623,6 +625,28 @@ meta_activate_session (void)
   return TRUE;
 }
 
+void
+meta_backend_native_freeze_frame_clock (MetaBackendNative *native)
+{
+  MetaBackendNativePrivate *priv =
+    meta_backend_native_get_instance_private (native);
+
+  priv->frame_freeze_count++;
+  if (priv->frame_freeze_count == 1)
+    clutter_egl_freeze_master_clock ();
+}
+
+void
+meta_backend_native_thaw_frame_clock (MetaBackendNative *native)
+{
+  MetaBackendNativePrivate *priv =
+    meta_backend_native_get_instance_private (native);
+
+  priv->frame_freeze_count--;
+  if (priv->frame_freeze_count == 0)
+    clutter_egl_thaw_master_clock ();
+}
+
 void
 meta_backend_native_pause (MetaBackendNative *native)
 {
@@ -633,7 +657,8 @@ meta_backend_native_pause (MetaBackendNative *native)
     META_MONITOR_MANAGER_KMS (monitor_manager);
 
   clutter_evdev_release_devices ();
-  clutter_egl_freeze_master_clock ();
+
+  meta_backend_native_freeze_frame_clock (native);
 
   meta_monitor_manager_kms_pause (monitor_manager_kms);
 }
@@ -651,7 +676,8 @@ void meta_backend_native_resume (MetaBackendNative *native)
   meta_monitor_manager_kms_resume (monitor_manager_kms);
 
   clutter_evdev_reclaim_devices ();
-  clutter_egl_thaw_master_clock ();
+
+  meta_backend_native_thaw_frame_clock (native);
 
   stage = meta_backend_get_stage (backend);
   clutter_actor_queue_redraw (stage);
diff --git a/src/backends/native/meta-backend-native.h b/src/backends/native/meta-backend-native.h
index d69fbe057..6de203304 100644
--- a/src/backends/native/meta-backend-native.h
+++ b/src/backends/native/meta-backend-native.h
@@ -35,6 +35,10 @@ G_DECLARE_FINAL_TYPE (MetaBackendNative, meta_backend_native,
 
 gboolean meta_activate_vt (int vt, GError **error);
 
+void meta_backend_native_freeze_frame_clock (MetaBackendNative *native);
+
+void meta_backend_native_thaw_frame_clock (MetaBackendNative *native);
+
 void meta_backend_native_pause (MetaBackendNative *backend_native);
 
 void meta_backend_native_resume (MetaBackendNative *backend_native);