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, 9 insertions, 2 deletions

diff --git a/source/gameengine/Ketsji/KX_Scene.h b/source/gameengine/Ketsji/KX_Scene.h
index 55e7afa4957..e1e89e253ed 100644
--- a/source/gameengine/Ketsji/KX_Scene.h
+++ b/source/gameengine/Ketsji/KX_Scene.h
@@ -265,6 +265,11 @@ protected:
 	bool m_dbvt_culling;
 	
 	/**
+	 * Occlusion culling resolution
+	 */ 
+	int m_dbvt_occlusion_res;
+
+	/**
 	 * The framing settings used by this scene
 	 */
 
@@ -545,8 +550,10 @@ public:
 	bool IsClearingZBuffer();
 	void EnableZBufferClearing(bool isclearingZbuffer);
 	// use of DBVT tree for camera culling
-	void SetDbvtCameraCulling(bool b) { m_dbvt_culling = b; };
-	bool GetDbvtCameraCulling() { return m_dbvt_culling; };
+	void SetDbvtCulling(bool b) { m_dbvt_culling = b; };
+	bool GetDbvtCulling() { return m_dbvt_culling; };
+	void SetDbvtOcclusionRes(int i) { m_dbvt_occlusion_res = i; };
+	int GetDbvtOcclusionRes() { return m_dbvt_occlusion_res; };
 	
 	void SetSceneConverter(class KX_BlenderSceneConverter* sceneConverter);