[gtk+/wip/ebassi/legacy-gl: 5/5] x11: Control legacy GL context via environment variable

[Emmanuele Bassi <ebassi src gnome org>]

commit 7f2b9742cbb527c87e7dc99a6aefe9125dd70f7b
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Tue Oct 6 19:57:45 2015 +0100

    x11: Control legacy GL context via environment variable
    
    For testing purposes, we may want to force the creation of legacy GLX
    contexts via an environment variable.

 gdk/x11/gdkglcontext-x11.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/gdk/x11/gdkglcontext-x11.c b/gdk/x11/gdkglcontext-x11.c
index d55944e..faac9c1 100644
--- a/gdk/x11/gdkglcontext-x11.c
+++ b/gdk/x11/gdkglcontext-x11.c
@@ -637,7 +637,8 @@ gdk_x11_gl_context_realize (GdkGLContext  *context,
   compat_bit = gdk_gl_context_get_forward_compatible (context);
 
   /* If there is no glXCreateContextAttribsARB() then we default to legacy */
-  legacy_bit = !GDK_X11_DISPLAY (display)->has_glx_create_context;
+  legacy_bit = !GDK_X11_DISPLAY (display)->has_glx_create_context ||
+               g_getenv ("GDK_GL_USE_LEGACY") != NULL;
 
   /* We cannot share legacy contexts with core profile ones, so the
    * shared context is the one that decides if we're going to create