From: Tim Moore <timoore@redhat.com>
Date: Thu, 12 Nov 2009 09:58:42 +0000 (+0100)
Subject: Attach an empty shader program to the scene graph root
X-Git-Url: https://git.mxchange.org/?a=commitdiff_plain;h=6acd657a05b8dfb5a4491de871fdbf51404bcfe5;p=flightgear.git

Attach an empty shader program to the scene graph root

This establishes a default state of using the OpenGL fixed function pipeline.
Otherwise a shader program from a state set can leak into state sets that don't
use shaders at all.
---

diff --git a/src/Main/renderer.cxx b/src/Main/renderer.cxx
index ece25ec32..cfe5f29a3 100644
--- a/src/Main/renderer.cxx
+++ b/src/Main/renderer.cxx
@@ -47,6 +47,7 @@
 #include <osg/Notify>
 #include <osg/PolygonMode>
 #include <osg/PolygonOffset>
+#include <osg/Program>
 #include <osg/Version>
 #include <osg/TexEnv>
 
@@ -552,6 +553,10 @@ FGRenderer::init( void )
     // as the rest of the scene. This may not be true in practice.
     mRealRoot->addChild(thesky->getCloudRoot());
     mRealRoot->addChild(FGCreateRedoutNode());
+    // Attach empty program to the scene root so that shader programs
+    // don't leak into state sets (effects) that shouldn't have one.
+    stateSet = mRealRoot->getOrCreateStateSet();
+    stateSet->setAttributeAndModes(new osg::Program, osg::StateAttribute::ON);
 }