[gnome-session/wip/hadess/nvidia-renderer-name] g-s-check-acceleration: Detect when NVidia renderer name is requested

[Bastien Nocera <hadess src gnome org>]

commit ab9c8e3025c3b431898a321c6dd1d324141cf36c
Author: Bastien Nocera <hadess hadess net>
Date:   Tue Nov 5 14:37:59 2019 +0100

    g-s-check-acceleration: Detect when NVidia renderer name is requested
    
    Those 2 new envvars could be set by gnome-control-center to print the
    renderer for non-Mesa cards, in particular NVidia cards running the
    nvidia proprietary driver.

 tools/gnome-session-check-accelerated.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)
---
diff --git a/tools/gnome-session-check-accelerated.c b/tools/gnome-session-check-accelerated.c
index 31f0a525..4d00e2e3 100644
--- a/tools/gnome-session-check-accelerated.c
+++ b/tools/gnome-session-check-accelerated.c
@@ -115,12 +115,14 @@ get_gtk_gles_renderer (void)
 static gboolean
 is_discrete_gpu_check (void)
 {
-       const char *dri_prime;
+       const char *dri_prime, *nv_prime, *glx_vendor_name;
 
        dri_prime = g_getenv ("DRI_PRIME");
-       if (!dri_prime)
-               return FALSE;
-       if (*dri_prime != '1')
+       nv_prime = g_getenv ("__NV_PRIME_RENDER_OFFLOAD");
+       glx_vendor_name = g_getenv ("__GLX_VENDOR_LIBRARY_NAME");
+       if (!dri_prime &&
+           !nv_prime &&
+           !glx_vendor_name)
                return FALSE;
        return TRUE;
 }