From 3c1c0f015e583e40843469aa9e6cef6a7679e21b Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Wed, 19 Dec 2001 08:49:10 +0000
Subject: [PATCH] Added check for GL_ARB_imaging extension to osg;:ColorMatrix

---
 src/osg/ColorMatrix.cpp | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/src/osg/ColorMatrix.cpp b/src/osg/ColorMatrix.cpp
index c7d704ced..6756d33d6 100644
--- a/src/osg/ColorMatrix.cpp
+++ b/src/osg/ColorMatrix.cpp
@@ -1,4 +1,5 @@
 #include <osg/GL>
+#include <osg/GLExtensions>
 #include <osg/ColorMatrix>
 
 using namespace osg;
@@ -15,8 +16,11 @@ ColorMatrix::~ColorMatrix()
 void ColorMatrix::apply(State&) const
 {
 //    std::cout<<"applying matrix"<<_matrix<<std::endl;
-
-    glMatrixMode( GL_COLOR );
-    glLoadMatrixf( _matrix.ptr() );
-    glMatrixMode( GL_MODELVIEW );
+    static bool s_ARB_imaging = isGLExtensionSupported("GL_ARB_imaging");
+	if (s_ARB_imaging)
+	{
+		glMatrixMode( GL_COLOR );
+		glLoadMatrixf( _matrix.ptr() );
+		glMatrixMode( GL_MODELVIEW );
+	}
 }