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, 11 insertions, 0 deletions

diff --git a/source/gameengine/Rasterizer/RAS_Polygon.cpp b/source/gameengine/Rasterizer/RAS_Polygon.cpp
index 66b14bb60b0..eacc1285166 100644
--- a/source/gameengine/Rasterizer/RAS_Polygon.cpp
+++ b/source/gameengine/Rasterizer/RAS_Polygon.cpp
@@ -97,6 +97,17 @@ void RAS_Polygon::SetCollider(bool visible)
 	else m_polyflags &= ~COLLIDER;
 }
 
+bool RAS_Polygon::IsTwoside()
+{
+	return (m_polyflags & TWOSIDE) != 0;
+}
+
+void RAS_Polygon::SetTwoside(bool twoside)
+{
+	if(twoside) m_polyflags |= TWOSIDE;
+	else m_polyflags &= ~TWOSIDE;
+}
+
 RAS_MaterialBucket* RAS_Polygon::GetMaterial()
 {
 	return m_bucket;