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

3 files changed, 19 insertions, 6 deletions

diff --git a/source/gameengine/Converter/BL_BlenderDataConversion.cpp b/source/gameengine/Converter/BL_BlenderDataConversion.cpp
index 50a660e77c9..5de2c4a2fe7 100644
--- a/source/gameengine/Converter/BL_BlenderDataConversion.cpp
+++ b/source/gameengine/Converter/BL_BlenderDataConversion.cpp
@@ -843,6 +843,7 @@ RAS_MeshObject* BL_ConvertMesh(Mesh* mesh, Object* blenderobj, RAS_IRenderTools*
 	
 		{
 			bool visible = true;
+			bool twoside = false;
 			RAS_IPolyMaterial* polymat = NULL;
 			BL_Material *bl_mat = NULL;
 
@@ -859,6 +860,7 @@ RAS_MeshObject* BL_ConvertMesh(Mesh* mesh, Object* blenderobj, RAS_IRenderTools*
 
 				visible = ((bl_mat->ras_mode & POLY_VIS)!=0);
 				collider = ((bl_mat->ras_mode & COLLIDER)!=0);
+				twoside = ((bl_mat->mode & TF_TWOSIDE)!=0);
 
 				/* vertex colors and uv's were stored in bl_mat temporarily */
 				bl_mat->GetConversionRGB(rgb);
@@ -899,6 +901,7 @@ RAS_MeshObject* BL_ConvertMesh(Mesh* mesh, Object* blenderobj, RAS_IRenderTools*
 					mode = tface->mode;
 					
 					visible = !((mface->flag & ME_HIDE)||(tface->mode & TF_INVISIBLE));
+					twoside = ((tface->mode & TF_TWOSIDE)!=0);
 					
 					uv0.setValue(tface->uv[0]);
 					uv1.setValue(tface->uv[1]);
@@ -999,6 +1002,7 @@ RAS_MeshObject* BL_ConvertMesh(Mesh* mesh, Object* blenderobj, RAS_IRenderTools*
 
 			poly->SetVisible(visible);
 			poly->SetCollider(collider);
+			poly->SetTwoside(twoside);
 			//poly->SetEdgeCode(mface->edcode);
 
 			meshobj->AddVertex(poly,0,pt0,uv0,uv20,tan0,rgb0,no0,flat,mface->v1);
@@ -1677,6 +1681,7 @@ static KX_GameObject *gameobject_from_blenderobject(
 		bool ignoreActivityCulling =  
 			((ob->gameflag2 & OB_NEVER_DO_ACTIVITY_CULLING)!=0);
 		gameobj->SetIgnoreActivityCulling(ignoreActivityCulling);
+		gameobj->SetOccluder((ob->gameflag & OB_OCCLUDER) != 0, false);
 	
 		// two options exists for deform: shape keys and armature
 		// only support relative shape key
@@ -1894,12 +1899,14 @@ void BL_ConvertBlenderObjects(struct Main* maggie,
 	if (blenderscene->world) {
 		kxscene->SetActivityCulling( (blenderscene->world->mode & WO_ACTIVITY_CULLING) != 0);
 		kxscene->SetActivityCullingRadius(blenderscene->world->activityBoxRadius);
-		kxscene->SetDbvtCameraCulling((blenderscene->world->mode & WO_DBVT_CAMERA_CULLING) != 0);
+		kxscene->SetDbvtCulling((blenderscene->world->mode & WO_DBVT_CULLING) != 0);
 	} else {
 		kxscene->SetActivityCulling(false);
-		kxscene->SetDbvtCameraCulling(false);
+		kxscene->SetDbvtCulling(false);
 	}
-	
+	// no occlusion culling by default
+	kxscene->SetDbvtOcclusionRes(0);
+
 	int activeLayerBitInfo = blenderscene->lay;
 	
 	// templist to find Root Parents (object with no parents)
@@ -2452,8 +2459,9 @@ void BL_ConvertBlenderObjects(struct Main* maggie,
 	}
 	
 	// create graphic controller for culling
-	if (kxscene->GetDbvtCameraCulling())
+	if (kxscene->GetDbvtCulling())
 	{
+		bool occlusion = false;
 		for (i=0; i<sumolist->GetCount();i++)
 		{
 			KX_GameObject* gameobj = (KX_GameObject*) sumolist->GetValue(i);
@@ -2464,8 +2472,12 @@ void BL_ConvertBlenderObjects(struct Main* maggie,
 				// box[0] is the min, box[1] is the max
 				bool isactive = objectlist->SearchValue(gameobj);
 				BL_CreateGraphicObjectNew(gameobj,box[0],box[1],kxscene,isactive,physics_engine);
+				if (gameobj->GetOccluder())
+					occlusion = true;
 			}
 		}
+		if (occlusion)
+			kxscene->SetDbvtOcclusionRes(blenderscene->world->occlusionRes);
 	}
 	
 	//set ini linearVel and int angularVel //rcruiz
diff --git a/source/gameengine/Converter/KX_BlenderSceneConverter.cpp b/source/gameengine/Converter/KX_BlenderSceneConverter.cpp
index b0c676a410d..190f9dbb472 100644
--- a/source/gameengine/Converter/KX_BlenderSceneConverter.cpp
+++ b/source/gameengine/Converter/KX_BlenderSceneConverter.cpp
@@ -283,7 +283,7 @@ void KX_BlenderSceneConverter::ConvertScene(const STR_String& scenename,
 			case WOPHY_BULLET:
 				{
 					physics_engine = UseBullet;
-					useDbvtCulling = (blenderscene->world->mode & WO_DBVT_CAMERA_CULLING) != 0;
+					useDbvtCulling = (blenderscene->world->mode & WO_DBVT_CULLING) != 0;
 					break;
 				}
                                 
diff --git a/source/gameengine/Converter/KX_ConvertActuators.cpp b/source/gameengine/Converter/KX_ConvertActuators.cpp
index f7635856ad9..eb2d0a1c4b1 100644
--- a/source/gameengine/Converter/KX_ConvertActuators.cpp
+++ b/source/gameengine/Converter/KX_ConvertActuators.cpp
@@ -1008,9 +1008,10 @@ void BL_ConvertActuators(char* maggiename,
 			bVisibilityActuator *vis_act = (bVisibilityActuator *) bact->data;
 			KX_VisibilityActuator * tmp_vis_act = NULL;
 			bool v = ((vis_act->flag & ACT_VISIBILITY_INVISIBLE) != 0);
+			bool o = ((vis_act->flag & ACT_VISIBILITY_OCCLUSION) != 0);
 			bool recursive = ((vis_act->flag & ACT_VISIBILITY_RECURSIVE) != 0);
 
-			tmp_vis_act = new KX_VisibilityActuator(gameobj, !v, recursive);
+			tmp_vis_act = new KX_VisibilityActuator(gameobj, !v, o, recursive);
 			
 			baseact = tmp_vis_act;
 		}