From ac5ffa2bec94cfc6790f8eecbf1a5422f548fbf7 Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Mon, 30 May 2005 16:15:11 +0000
Subject: [PATCH] Added support for reading:

  OSG_MINIMUM_COMPILE_TIME_PER_FRAME <float>

and

   OSG_MAXIMUM_OBJECTS_TO_COMPILE_PER_FRAME <int>

environmental variable during the initialization of the DatabasePager
to allow apps to be tweaked for best database pager behavior.
---
 src/osgDB/DatabasePager.cpp | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/src/osgDB/DatabasePager.cpp b/src/osgDB/DatabasePager.cpp
index 79b920b78..4c2b63081 100644
--- a/src/osgDB/DatabasePager.cpp
+++ b/src/osgDB/DatabasePager.cpp
@@ -5,6 +5,7 @@
 #include <osg/Timer>
 #include <osg/Texture>
 #include <osg/Notify>
+#include <osg/ApplicationUsage>
 
 #include <OpenThreads/ScopedLock>
 
@@ -19,6 +20,9 @@
 using namespace osgDB;
 using namespace OpenThreads;
 
+static osg::ApplicationUsageProxy DatabasePager_e0(osg::ApplicationUsage::ENVIRONMENTAL_VARIABLE,"OSG_MINIMUM_COMPILE_TIME_PER_FRAME <float>","minimum compile time alloted to compiling GL objects per frame in database pager.");
+static osg::ApplicationUsageProxy DatabasePager_e1(osg::ApplicationUsage::ENVIRONMENTAL_VARIABLE,"OSG_MAXIMUM_OBJECTS_TO_COMPILE_PER_FRAME <int>","maximum number of GL objects to compile per frame in database pager.");
+
 DatabasePager::DatabasePager()
 {
     //osg::notify(osg::INFO)<<"Constructing DatabasePager()"<<std::endl;
@@ -56,6 +60,17 @@ DatabasePager::DatabasePager()
     _minimumTimeAvailableForGLCompileAndDeletePerFrame = 0.001; // 1ms.
     _maximumNumOfObjectsToCompilePerFrame = 8;
 
+    const char* ptr=0;
+    if( (ptr = getenv("OSG_MINIMUM_COMPILE_TIME_PER_FRAME")) != 0)
+    {
+        _minimumTimeAvailableForGLCompileAndDeletePerFrame = atof(ptr);
+    }
+
+    if( (ptr = getenv("OSG_MAXIMUM_OBJECTS_TO_COMPILE_PER_FRAME")) != 0)
+    {
+        _maximumNumOfObjectsToCompilePerFrame = atoi(ptr);
+    }
+
     // make sure a SharedStateManager exists.
     //osgDB::Registry::instance()->getOrCreateSharedStateManager();