renderer: Add API to check whether renderer is hardware accelerated

Also expose an introspected variant via the MetaBackend.

https://gitlab.gnome.org/GNOME/mutter/merge_requests/838

src/backends/meta-backend.c

@@ -1032,6 +1032,21 @@ meta_backend_get_remote_access_controller (MetaBackend *backend)
 #endif
 }
 
+/**
+ * meta_backend_is_rendering_hardware_accelerated:
+ * @backend: A #MetaBackend
+ *
+ * Returns: %TRUE if the rendering is hardware accelerated, otherwise
+ * %FALSE.
+ */
+gboolean
+meta_backend_is_rendering_hardware_accelerated (MetaBackend *backend)
+{
+  MetaRenderer *renderer = meta_backend_get_renderer (backend);
+
+  return meta_renderer_is_hardware_accelerated (renderer);
+}
+
 /**
  * meta_backend_grab_device: (skip)
  */

src/backends/meta-renderer.c

@@ -186,6 +186,33 @@ meta_renderer_get_view_from_logical_monitor (MetaRenderer       *renderer,
   return NULL;
 }
 
+gboolean
+meta_renderer_is_hardware_accelerated (MetaRenderer *renderer)
+{
+  MetaRendererPrivate *priv = meta_renderer_get_instance_private (renderer);
+  MetaBackend *backend = priv->backend;
+  ClutterBackend *clutter_backend = meta_backend_get_clutter_backend (backend);
+  CoglContext *cogl_context =
+    clutter_backend_get_cogl_context (clutter_backend);
+  CoglGpuInfo *info = &cogl_context->gpu;
+
+  switch (info->architecture)
+    {
+    case COGL_GPU_INFO_ARCHITECTURE_UNKNOWN:
+    case COGL_GPU_INFO_ARCHITECTURE_SANDYBRIDGE:
+    case COGL_GPU_INFO_ARCHITECTURE_SGX:
+    case COGL_GPU_INFO_ARCHITECTURE_MALI:
+      return TRUE;
+    case COGL_GPU_INFO_ARCHITECTURE_LLVMPIPE:
+    case COGL_GPU_INFO_ARCHITECTURE_SOFTPIPE:
+    case COGL_GPU_INFO_ARCHITECTURE_SWRAST:
+      return FALSE;
+    }
+
+  g_assert_not_reached ();
+  return FALSE;
+}
+
 static void
 meta_renderer_get_property (GObject    *object,
                             guint       prop_id,

src/backends/meta-renderer.h

@@ -61,4 +61,6 @@ GList * meta_renderer_get_views (MetaRenderer *renderer);
 MetaRendererView * meta_renderer_get_view_from_logical_monitor (MetaRenderer       *renderer,
                                                                 MetaLogicalMonitor *logical_monitor);
 
+gboolean meta_renderer_is_hardware_accelerated (MetaRenderer *renderer);
+
 #endif /* META_RENDERER_H */

src/meta/meta-backend.h

@@ -64,6 +64,9 @@ MetaSettings *meta_backend_get_settings (MetaBackend *backend);
 META_EXPORT
 MetaRemoteAccessController * meta_backend_get_remote_access_controller (MetaBackend *backend);
 
+META_EXPORT
+gboolean meta_backend_is_rendering_hardware_accelerated (MetaBackend *backend);
+
 META_EXPORT
 void meta_clutter_init (void);