From 818dee31d8582ef39ff99283b82c24c0f9fe6da3 Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Mon, 8 Jan 2018 10:04:28 +0000
Subject: [PATCH] Fixed build with GLES2

---
 src/osg/Sampler.cpp | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/src/osg/Sampler.cpp b/src/osg/Sampler.cpp
index 803362d13..c2f89443b 100644
--- a/src/osg/Sampler.cpp
+++ b/src/osg/Sampler.cpp
@@ -27,6 +27,19 @@
 #define GL_TEXTURE_WRAP_R 0x2804
 #endif
 
+#ifndef GL_TEXTURE_COMPARE_MODE
+#define GL_TEXTURE_COMPARE_MODE 0x884C
+#endif
+
+#ifndef GL_TEXTURE_COMPARE_FUNC
+#define GL_TEXTURE_COMPARE_FUNC 0x884D
+#endif
+
+#ifndef GL_TEXTURE_LOD_BIAS
+#define GL_TEXTURE_LOD_BIAS 0x8501
+#endif
+
+
 using namespace osg;
 
 Sampler::Sampler(): StateAttribute(),