From 0af0c75dc60166d2755537b8499e9e4a1501e4a8 Mon Sep 17 00:00:00 2001
From: Ray Strode <rstrode@redhat.com>
Date: Tue, 15 Jan 2019 10:29:55 -0500
Subject: [PATCH 5/9] backends/native: emit gl-video-memory-purged when
 becoming active

The proprietary NVIDIA driver garbles memory on suspend.  In order
to work around that limitation, mutter needs to refresh all its
textures on resuem.

This commit lays the way toward doing that by emitting the
"gl-video-memory-purged" signal when the compositor becomes active
by logind (which happens on VT switch and on resume).
---
 src/backends/native/meta-backend-native.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/backends/native/meta-backend-native.c b/src/backends/native/meta-backend-native.c
index 042d96ec6..f87c5a066 100644
--- a/src/backends/native/meta-backend-native.c
+++ b/src/backends/native/meta-backend-native.c
@@ -618,44 +618,51 @@ meta_activate_session (void)
       g_warning ("Could not activate session: %s\n", error->message);
       g_error_free (error);
       return FALSE;
     }
 
   return TRUE;
 }
 
 void
 meta_backend_native_pause (MetaBackendNative *native)
 {
   MetaBackend *backend = META_BACKEND (native);
   MetaMonitorManager *monitor_manager =
     meta_backend_get_monitor_manager (backend);
   MetaMonitorManagerKms *monitor_manager_kms =
     META_MONITOR_MANAGER_KMS (monitor_manager);
 
   clutter_evdev_release_devices ();
   clutter_egl_freeze_master_clock ();
 
   meta_monitor_manager_kms_pause (monitor_manager_kms);
 }
 
 void meta_backend_native_resume (MetaBackendNative *native)
 {
   MetaBackend *backend = META_BACKEND (native);
   MetaMonitorManager *monitor_manager =
     meta_backend_get_monitor_manager (backend);
   MetaMonitorManagerKms *monitor_manager_kms =
     META_MONITOR_MANAGER_KMS (monitor_manager);
+  MetaDisplay *display = meta_get_display ();
+  ClutterBackend *clutter_backend = clutter_get_default_backend ();
+  CoglContext *cogl_context =
+    clutter_backend_get_cogl_context (clutter_backend);
   ClutterActor *stage;
   MetaIdleMonitor *idle_monitor;
 
+  if (cogl_has_feature (cogl_context, COGL_FEATURE_ID_UNSTABLE_TEXTURES))
+    g_signal_emit_by_name (display, "gl-video-memory-purged");
+
   meta_monitor_manager_kms_resume (monitor_manager_kms);
 
   clutter_evdev_reclaim_devices ();
   clutter_egl_thaw_master_clock ();
 
   stage = meta_backend_get_stage (backend);
   clutter_actor_queue_redraw (stage);
 
   idle_monitor = meta_backend_get_idle_monitor (backend, 0);
   meta_idle_monitor_reset_idletime (idle_monitor);
 }
-- 
2.18.1