From 1590f6be3b1319298eddb0be379b567fd0decc1e Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Thu, 18 Mar 2010 15:04:27 +0000
Subject: [PATCH] Added in a test of using the utility classes in
 include/osgUtil/MeshOptimizers to see if they could improve peformance.

Tests shown poorer performance with the code enabled so for now the code is #if 0 #endif'd out, and just left in place for future testing.
---
 src/osgTerrain/GeometryTechnique.cpp | 27 +++++++++++++++++++++++----
 1 file changed, 23 insertions(+), 4 deletions(-)

diff --git a/src/osgTerrain/GeometryTechnique.cpp b/src/osgTerrain/GeometryTechnique.cpp
index 0dea263c0..3539e8a81 100644
--- a/src/osgTerrain/GeometryTechnique.cpp
+++ b/src/osgTerrain/GeometryTechnique.cpp
@@ -16,6 +16,7 @@
 #include <osgTerrain/Terrain>
 
 #include <osgUtil/SmoothingVisitor>
+#include <osgUtil/MeshOptimizers>
 
 #include <osgDB/FileUtils>
 
@@ -690,13 +691,31 @@ void GeometryTechnique::generateGeometry(Locator* masterLocator, const osg::Vec3
 
     geometry->setUseDisplayList(false);
     geometry->setUseVertexBufferObjects(true);
-    
-    
+
+#if 0
+    {
+        osgUtil::VertexCacheMissVisitor vcmv_before;
+        osgUtil::VertexCacheMissVisitor vcmv_after;
+        osgUtil::VertexCacheVisitor vcv;
+        osgUtil::VertexAccessOrderVisitor vaov;
+
+        vcmv_before.doGeometry(*geometry);
+        vcv.optimizeVertices(*geometry);
+        vaov.optimizeOrder(*geometry);
+        vcmv_after.doGeometry(*geometry);
+#if 0
+        OSG_NOTICE<<"vcmv_before.triangles="<<vcmv_before.triangles<<std::endl;
+        OSG_NOTICE<<"vcmv_before.misses="<<vcmv_before.misses<<std::endl;
+        OSG_NOTICE<<"vcmv_after.misses="<<vcmv_after.misses<<std::endl;
+        OSG_NOTICE<<std::endl;
+#endif
+    }
+#endif
+
     if (osgDB::Registry::instance()->getBuildKdTreesHint()==osgDB::ReaderWriter::Options::BUILD_KDTREES &&
         osgDB::Registry::instance()->getKdTreeBuilder())
     {
-    
-        
+
         //osg::Timer_t before = osg::Timer::instance()->tick();
         //OSG_NOTICE<<"osgTerrain::GeometryTechnique::build kd tree"<<std::endl;
         osg::ref_ptr<osg::KdTreeBuilder> builder = osgDB::Registry::instance()->getKdTreeBuilder()->clone();