From fe684078f9f76d71c3f771a38d287ebc255eaa8e Mon Sep 17 00:00:00 2001
From: Emmanuele Bassi <ebassi@gnome.org>
Date: Mon, 23 May 2016 08:31:47 +0100
Subject: [PATCH] gl: Add a realize() fallback

Calling gdk_gl_context_realize() should always result in a valid result,
so we need to provide a default implementation, to avoid a call to a
NULL function pointer.
---
 gdk/gdkglcontext.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/gdk/gdkglcontext.c b/gdk/gdkglcontext.c
index 44ef88b59a..40addbccae 100644
--- a/gdk/gdkglcontext.c
+++ b/gdk/gdkglcontext.c
@@ -286,11 +286,23 @@ gdk_gl_context_upload_texture (GdkGLContext    *context,
     }
 }
 
+static gboolean
+gdk_gl_context_real_realize (GdkGLContext  *self,
+                             GError       **error)
+{
+  g_set_error_literal (error, GDK_GL_ERROR, GDK_GL_ERROR_NOT_AVAILABLE,
+                       "The current backend does not support OpenGL");
+
+  return FALSE;
+}
+
 static void
 gdk_gl_context_class_init (GdkGLContextClass *klass)
 {
   GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
 
+  klass->realize = gdk_gl_context_real_realize;
+
   /**
    * GdkGLContext:display:
    *
-- 
2.30.2