[retro-gtk] gl-display: Don't clear depth buffer

[Adrien Plazas <aplazas src gnome org>]

commit e483fd82c4d596979f3bcaa786b8c1aa56076926
Author: Alexander Mikhaylenko <exalm7659 gmail com>
Date:   Thu Jul 26 14:16:04 2018 +0500

    gl-display: Don't clear depth buffer
    
    Since RetroGLDisplay doesn't use depth buffer, don't waste time clearing it.

 retro-gtk/retro-gl-display.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/retro-gtk/retro-gl-display.c b/retro-gtk/retro-gl-display.c
index b00fa5c..ff1fc8c 100644
--- a/retro-gtk/retro-gl-display.c
+++ b/retro-gtk/retro-gl-display.c
@@ -320,7 +320,7 @@ retro_gl_display_render (RetroGLDisplay *self)
 
   g_return_val_if_fail (RETRO_IS_GL_DISPLAY (self), FALSE);
 
-  glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+  glClear (GL_COLOR_BUFFER_BIT);
 
   filter = self->filter >= RETRO_VIDEO_FILTER_COUNT ?
     RETRO_VIDEO_FILTER_SMOOTH :