From 1859e27501af43eb06c551b916789f26cd49c857 Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Mon, 13 Jul 2015 08:48:46 +0000
Subject: [PATCH] From Terry Welsh, "fThis fixes problem where new
 glClipControl feature would not compile for GLES2 profile"

git-svn-id: http://svn.openscenegraph.org/osg/OpenSceneGraph/trunk@14943 16af8721-9629-0410-8352-f15c8da7e697
---
 include/osg/GLDefines | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/include/osg/GLDefines b/include/osg/GLDefines
index 79f73a83d..b3b44cea0 100644
--- a/include/osg/GLDefines
+++ b/include/osg/GLDefines
@@ -490,6 +490,15 @@ typedef char GLchar;
 #define GL_COMPUTE_SHADER_BIT             0x00000020
 #endif
 
+#ifndef GL_ARB_clip_control
+#define GL_LOWER_LEFT 0x8CA1
+#define GL_UPPER_LEFT 0x8CA2
+#define GL_CLIP_ORIGIN 0x935C
+#define GL_CLIP_DEPTH_MODE 0x935D
+#define GL_NEGATIVE_ONE_TO_ONE 0x935E
+#define GL_ZERO_TO_ONE 0x935F
+#endif
+
 #ifndef GL_ARB_depth_clamp
 #define GL_DEPTH_CLAMP                    0x864F
 #endif