Changeset 21 for trunk

Timestamp:

03/17/05 22:40:51 (20 years ago)

Author:

gametools

Message:

 

Location:

trunk/VUT/OcclusionCullingSceneManager

Files:

• include/OgreOcclusionCullingSceneManager.h (modified) (2 diffs)
• src/OgreOcclusionCullingSceneManager.cpp (modified) (3 diffs)

trunk/VUT/OcclusionCullingSceneManager/include/OgreOcclusionCullingSceneManager.h

@@ -48 +48 @@
                 void traverseNode(SceneNode *node);
                 void renderSceneNode(SceneNode *node);
+                void switchMode(bool switch2QueryMode);
+                
+                void renderStopAndWait();
                 /** renders the scene with view frustum culling only */
                 void renderCullFrustum();
+
+                void issueOcclusionQuery(SceneNode *node, bool wasVisible);
 
                 /** we use a priority queue rather than a renderstack */
@@ -55 +60 @@
                 // RenderQueue* mDistanceQueue;
 
-                int mFrameID;   
+                int mFrameID;
+                int mVisibilityThreshold;
+                int mCurrentTestIdx;
+                bool mIsQueryMode;
+
+                std::vector<HardwareOcclusionQuery *> mOcclusionQueries;
         };
 

trunk/VUT/OcclusionCullingSceneManager/src/OgreOcclusionCullingSceneManager.cpp

@@ -4 +4 @@
 #include "OgreRenderSystem.h"
 #include "OgreCamera.h"
+#include "OgreHardwareOcclusionQuery.h"
+
 #include <windows.h>
 
@@ -10 +12 @@
         //-----------------------------------------------------------------------
         OcclusionCullingSceneManager::OcclusionCullingSceneManager(): 
-        mFrameID(1), mDistanceQueue(NULL)
+        mFrameID(1), mDistanceQueue(NULL), mVisibilityThreshold(0), mCurrentTestIdx(0),
+        mIsQueryMode(false)
         {               
         }
@@ -68 +71 @@
                 }
         }
+        
+        
+        //-----------------------------------------------------------------------
+        void OcclusionCullingSceneManager::renderStopAndWait()
+        {
+                while(!mDistanceQueue->empty())
+                {
+                        SceneNode *node = mDistanceQueue->top();
+                        mDistanceQueue->pop();
+                
+                        // interesting for the visualization, so rest and set
+                        //node->SetVisible(false);
+
+                        if(mCameraInProgress->isVisible(node->_getWorldAABB()))
+                        {
+                                issueOcclusionQuery(node, false);
+                                
+                                unsigned int visiblePixels;
+                                // wait if result not available
+                                mOcclusionQueries[mCurrentTestIdx++]->pullOcclusionQuery(&visiblePixels);
+                                
+                                // node visible
+                                if(visiblePixels > mVisibilityThreshold)
+                                {
+                                        traverseNode(node);
+                                }
+                        }                                       
+                }
+        }
+
+        void OcclusionCullingSceneManager::issueOcclusionQuery(SceneNode *node, bool wasVisible)
+        {
+                // get next available test id
+                mOcclusionQueries[mCurrentTestIdx]->beginOcclusionQuery();
+        
+                // change state so the bounding box gets not actually rendered on the screen
+                switchMode(false);
+                node->_addBoundingBoxToQueue(getRenderQueue());
+                SceneManager::_renderVisibleObjects();
+                getRenderQueue()->clear();
+                switchMode(true);
+
+                mOcclusionQueries[mCurrentTestIdx++]->endOcclusionQuery();
+        }
+
+
+        //-----------------------------------------------------------------------
+        void OcclusionCullingSceneManager::switchMode(bool switch2QueryMode)
+        {       
+                // boolean used to avoid unnecessary state changes
+                if(switch2QueryMode != mIsQueryMode)
+                {
+                        mDestRenderSystem->_setColourBufferWriteEnabled(switch2QueryMode, 
+                                switch2QueryMode, switch2QueryMode, switch2QueryMode);
+                        mDestRenderSystem->_setDepthBufferWriteEnabled(switch2QueryMode);
+                        mDestRenderSystem->setLightingEnabled(switch2QueryMode);
+                        mIsQueryMode = switch2QueryMode;
+                }
+        }
+        
 
         //-----------------------------------------------------------------------