[mutter/wip/3-monitors-on-nvidia: 7/16] renderer/native: use GBM_FORMAT_ARGB8888 for primary rendering format

[Ray Strode <halfline src gnome org>]

commit 88a7b6e1da43d166361689278e9c59aa9a5b06ec
Author: Ray Strode <rstrode redhat com>
Date:   Fri Nov 30 14:10:38 2018 -0500

    renderer/native: use GBM_FORMAT_ARGB8888 for primary rendering format
    
    At the moment we use GBM_FORMAT_XRGB8888 which unfortunately triggers
    slow read pixels code in mesa.
    
    This commit changes it to ARGB8888 instead, which copies with memcpy.

 src/backends/native/meta-renderer-native.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/backends/native/meta-renderer-native.c b/src/backends/native/meta-renderer-native.c
index 04d325db2..f1f3e3c70 100644
--- a/src/backends/native/meta-renderer-native.c
+++ b/src/backends/native/meta-renderer-native.c
@@ -1006,7 +1006,7 @@ meta_renderer_native_choose_egl_config (CoglDisplay  *cogl_display,
       return choose_egl_config_from_gbm_format (egl,
                                                 egl_display,
                                                 attributes,
-                                                GBM_FORMAT_XRGB8888,
+                                                GBM_FORMAT_ARGB8888,
                                                 out_config,
                                                 error);
 #ifdef HAVE_EGL_DEVICE
@@ -2152,7 +2152,7 @@ meta_renderer_native_create_surface_gbm (CoglOnscreen        *onscreen,
   struct gbm_surface *new_gbm_surface = NULL;
   EGLNativeWindowType egl_native_window;
   EGLSurface new_egl_surface;
-  uint32_t format = GBM_FORMAT_XRGB8888;
+  uint32_t format = GBM_FORMAT_ARGB8888;
   GArray *modifiers;
 
   renderer_gpu_data =