From 74031287b4d60f789a90248bcdc0dc3cfba5d17f Mon Sep 17 00:00:00 2001
From: timoore <timoore>
Date: Tue, 30 Dec 2008 23:36:51 +0000
Subject: [PATCH] Set BACKGROUND_BIT as camera node mask.

This prevents the dreaded black rectangle from appearing on systems
that don't have OpenGL frame buffer object support.
---
 src/Instrumentation/od_gauge.cxx | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/Instrumentation/od_gauge.cxx b/src/Instrumentation/od_gauge.cxx
index 25184450c..820f0a9d8 100644
--- a/src/Instrumentation/od_gauge.cxx
+++ b/src/Instrumentation/od_gauge.cxx
@@ -37,6 +37,7 @@
 #include <osg/StateSet>
 #include <osgDB/FileNameUtils>
 
+#include <simgear/scene/util/RenderConstants.hxx>
 #include <simgear/screen/extensions.hxx>
 #include <simgear/debug/logstream.hxx>
 
@@ -53,6 +54,8 @@ FGODGauge::FGODGauge() :
 
 void FGODGauge::allocRT () {
     camera = new osg::Camera;
+    // Only the far camera should trigger this texture to be rendered.
+    camera->setNodeMask(simgear::BACKGROUND_BIT);
     camera->setProjectionMatrix(osg::Matrix::ortho2D(-256.0, 256.0, -256.0,
             256.0));
     camera->setViewport(0, 0, textureWH, textureWH);