debian/patches/03_gtk-gl-Use-our-GL-function-table-instead-of-directly.patch

From f722f047efa6eba2d793364f7031adadcf2efab7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sebastian=20Dr=C3=B6ge?= <sebastian@centricular.com>
Date: Wed, 19 Aug 2015 13:52:21 +0300
Subject: [PATCH] gtk/gl: Use our GL function table instead of directly calling
 GL functions

Otherwise we would have to link the plugin to the GL libraries directly.
---
 ext/gtk/gtkgstglwidget.c | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/ext/gtk/gtkgstglwidget.c b/ext/gtk/gtkgstglwidget.c
index cdce3aa..059fa87 100644
--- a/ext/gtk/gtkgstglwidget.c
+++ b/ext/gtk/gtkgstglwidget.c
@@ -202,10 +202,12 @@ _redraw_texture (GtkGstGLWidget * gst_widget, guint tex)
 }
 
 static inline void
-_draw_black (void)
+_draw_black (GstGLContext * context)
 {
-  glClearColor (0.0, 0.0, 0.0, 0.0);
-  glClear (GL_COLOR_BUFFER_BIT);
+  const GstGLFuncs *gl = context->gl_vtable;
+
+  gl->ClearColor (0.0, 0.0, 0.0, 0.0);
+  gl->Clear (GL_COLOR_BUFFER_BIT);
 }
 
 static gboolean
@@ -225,7 +228,7 @@ gtk_gst_gl_widget_render (GtkGLArea * widget, GdkGLContext * context)
     gtk_gst_gl_widget_init_redisplay (GTK_GST_GL_WIDGET (widget));
 
   if (!priv->initted || !base_widget->negotiated) {
-    _draw_black ();
+    _draw_black (priv->other_context);
     goto done;
   }
 
@@ -237,7 +240,7 @@ gtk_gst_gl_widget_render (GtkGLArea * widget, GdkGLContext * context)
 
     if (!gst_video_frame_map (&gl_frame, &base_widget->v_info, buffer,
             GST_MAP_READ | GST_MAP_GL)) {
-      _draw_black ();
+      _draw_black (priv->other_context);
       goto done;
     }
 
-- 
2.5.0