[gtk/matthiasc/for-master] gdk: Tweak our GL debug message callback

[Matthias Clasen <matthiasc src gnome org>]

commit bdbfaef4d816edb6c1b3f9acd877b33361ca7553
Author: Matthias Clasen <mclasen redhat com>
Date:   Tue Oct 6 09:25:47 2020 -0400

    gdk: Tweak our GL debug message callback
    
    Go back to installing our debug message callback
    unconditionally if G_ENABLE_CONSISTENCY_CHECKS is
    defined, and allow opting into it using GDK_DEBUG=gl-debug
    otherwise.

 gdk/gdkglcontext.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)
---
diff --git a/gdk/gdkglcontext.c b/gdk/gdkglcontext.c
index 01c67688f2..135db30140 100644
--- a/gdk/gdkglcontext.c
+++ b/gdk/gdkglcontext.c
@@ -864,7 +864,6 @@ gdk_gl_context_get_use_es (GdkGLContext *context)
   return priv->use_es > 0;
 }
 
-#ifdef G_ENABLE_DEBUG
 static void
 gl_debug_message_callback (GLenum        source,
                            GLenum        type,
@@ -955,7 +954,6 @@ gl_debug_message_callback (GLenum        source,
   g_warning ("OPENGL:\n    Source: %s\n    Type: %s\n    Severity: %s\n    Message: %s",
              message_source, message_type, message_severity, message);
 }
-#endif
 
 /**
  * gdk_gl_context_realize:
@@ -1011,15 +1009,19 @@ gdk_gl_context_check_extensions (GdkGLContext *context)
 #ifdef G_ENABLE_DEBUG
   display = gdk_draw_context_get_display (GDK_DRAW_CONTEXT (context));
   gl_debug = GDK_DISPLAY_DEBUG_CHECK (display, GL_DEBUG);
+#endif
 
-  if (priv->has_debug_output && gl_debug)
+  if (priv->has_debug_output
+#ifndef G_ENABLE_CONSISTENCY_CHECKS
+      && gl_debug
+#endif
+      )
     {
       gdk_gl_context_make_current (context);
       glEnable (GL_DEBUG_OUTPUT);
       glEnable (GL_DEBUG_OUTPUT_SYNCHRONOUS);
       glDebugMessageCallback (gl_debug_message_callback, NULL);
     }
-#endif
 
   if (priv->use_es)
     {