From 4a08d8daaab31cfb13a7854bccacd0bd1f0814fa Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Mon, 14 Jan 2008 11:44:04 +0000
Subject: [PATCH] Added geometry shader extension supported check to geometry
 shader parameter calls

---
 src/osg/Program.cpp | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/src/osg/Program.cpp b/src/osg/Program.cpp
index 5e78a6cac..073fd27a0 100644
--- a/src/osg/Program.cpp
+++ b/src/osg/Program.cpp
@@ -2664,10 +2664,13 @@ void Program::PerContextProgram::linkProgram()
         << " contextID=" << _contextID
         <<  std::endl;
 
-    _extensions->glProgramParameteri( _glProgramHandle, GL_GEOMETRY_VERTICES_OUT_EXT, _program->_geometryVerticesOut );
-    _extensions->glProgramParameteri( _glProgramHandle, GL_GEOMETRY_INPUT_TYPE_EXT, _program->_geometryInputType );
-    _extensions->glProgramParameteri( _glProgramHandle, GL_GEOMETRY_OUTPUT_TYPE_EXT, _program->_geometryOutputType );
-
+    if (_extensions->isGeometryShader4Supported())
+    {
+        _extensions->glProgramParameteri( _glProgramHandle, GL_GEOMETRY_VERTICES_OUT_EXT, _program->_geometryVerticesOut );
+        _extensions->glProgramParameteri( _glProgramHandle, GL_GEOMETRY_INPUT_TYPE_EXT, _program->_geometryInputType );
+        _extensions->glProgramParameteri( _glProgramHandle, GL_GEOMETRY_OUTPUT_TYPE_EXT, _program->_geometryOutputType );
+    }
+    
     // Detach removed shaders
     for( unsigned int i=0; i < _shadersToDetach.size(); ++i )
     {