BGE: Occlusion culling and other performance improvements.

Added occlusion culling capability in the BGE. 
More info: http://wiki.blender.org/index.php/Dev:Ref/Release_Notes/2.49/Game_Engine#BGE_Scenegraph_improvement
MSVC, scons, cmake, Makefile updated.

Other minor performance improvements:
- The rasterizer was computing the openGL model matrix of the objects too many times
- DBVT view frustrum culling was not properly culling behind the near plane:
  Large objects behind the camera were sent to the GPU
- Remove all references to mesh split/join feature as it is not yet functional

1 files changed, 4 insertions, 2 deletions

diff --git a/source/gameengine/Rasterizer/RAS_MaterialBucket.cpp b/source/gameengine/Rasterizer/RAS_MaterialBucket.cpp
index 69f73c2ee25..5ddcdd310b0 100644
--- a/source/gameengine/Rasterizer/RAS_MaterialBucket.cpp
+++ b/source/gameengine/Rasterizer/RAS_MaterialBucket.cpp
@@ -62,10 +62,12 @@ RAS_MeshSlot::~RAS_MeshSlot()
 {
 	vector<RAS_DisplayArray*>::iterator it;
 
+#ifdef USE_SPLIT
 	Split(true);
 
 	while(m_joinedSlots.size())
 		m_joinedSlots.front()->Split(true);
+#endif
 
 	for(it=m_displayArrays.begin(); it!=m_displayArrays.end(); it++) {
 		(*it)->m_users--;
@@ -428,11 +430,11 @@ bool RAS_MeshSlot::IsCulled()
 		return true;
 	if(!m_bCulled)
 		return false;
-	
+#ifdef USE_SPLIT	
 	for(it=m_joinedSlots.begin(); it!=m_joinedSlots.end(); it++)
 		if(!(*it)->m_bCulled)
 			return false;
-	
+#endif	
 	return true;
 }