Upstream-Status: Backport
Signed-off-by: Jussi Kukkonen <jussi.kukkonen@intel.com>


From f8cce5f6cb2958a4074f87cd345bfe46e0dda6e1 Mon Sep 17 00:00:00 2001
From: "Jasper St. Pierre" <jstpierre@mecheye.net>
Date: Mon, 20 Apr 2015 12:08:29 -0700
Subject: cogl-framebuffer-gl: Work again on GLESv2


diff --git a/cogl/driver/gl/cogl-framebuffer-gl.c b/cogl/driver/gl/cogl-framebuffer-gl.c
index 793b10b..609cfb3 100644
--- a/cogl/driver/gl/cogl-framebuffer-gl.c
+++ b/cogl/driver/gl/cogl-framebuffer-gl.c
@@ -107,6 +107,12 @@
 #ifndef GL_PACK_INVERT_MESA
 #define GL_PACK_INVERT_MESA 0x8758
 #endif
+#ifndef GL_BACK_LEFT
+#define GL_BACK_LEFT				0x0402
+#endif
+#ifndef GL_BACK_RIGHT
+#define GL_BACK_RIGHT				0x0403
+#endif
 
 #ifndef GL_COLOR
 #define GL_COLOR 0x1800
@@ -245,6 +251,9 @@ _cogl_framebuffer_gl_flush_stereo_mode_state (CoglFramebuffer *framebuffer)
   if (framebuffer->type == COGL_FRAMEBUFFER_TYPE_OFFSCREEN)
     return;
 
+  if (!ctx->glDrawBuffer)
+    return;
+
   /* The one-shot default draw buffer setting in _cogl_framebuffer_gl_bind
    * must have already happened. If not it would override what we set here. */
   g_assert (ctx->was_bound_to_onscreen);
-- 
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