From 122d7726e450712b8b2fc85db41e3c8ab7b6ad56 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 c473681cb..f593197e7 100644
--- a/src/backends/native/meta-backend-native.c
+++ b/src/backends/native/meta-backend-native.c
@@ -653,8 +653,15 @@ void meta_backend_native_resume (MetaBackendNative *native)
     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);
   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 ();
-- 
2.21.0