source: GTP/trunk/App/Demos/Vis/FriendlyCulling/src/RenderTraverser.cpp @ 3038

#include "RenderTraverser.h"
#include "glInterface.h"
#include "Camera.h"
#include "SceneEntity.h"
#include "RenderState.h"
#include "Geometry.h"
#include "Timer/PerfTimer.h"


using namespace std;


namespace CHCDemoEngine
{

        
void TraversalStatistics::Reset()
{
        mNumTraversedNodes = 0;
        mNumQueryCulledNodes = 0;
        mNumFrustumCulledNodes = 0;
        
        mNumRenderedGeometry = 0;
        mNumRenderedTriangles = 0;
        mNumRenderedNodes = 0;

        mNumIssuedQueries = 0;
        mNumStateChanges = 0;
        mNumBatches = 0;

        mWaitTime = 0;
        mQueryTime = 0;
        mRestTime = 0;
}



/******************************************************/
/*           RenderTraverser implementation           */
/******************************************************/


RenderTraverser::RenderTraverser():  
mVisibilityThreshold(0),
mBvh(NULL), 
mUseOptimization(false),
mFrameId(-1),
mUseRenderQueue(false),
mAssumedVisibleFrames(10),
mMaxBatchSize(50),
mUseTightBounds(false), 
mShowBounds(false),
mRenderQueue(NULL),
mMaxVisibleDistance(.0f)
{
}


RenderTraverser::~RenderTraverser()
{
        mQueryHandler.DestroyQueries();
}


void RenderTraverser::EnqueueNode(BvhNode *node)
{
        mBvh->UpdateDistance(node);
        mDistanceQueue.push(node);
}


void RenderTraverser::TraverseNode(BvhNode *node)
{
        ++ mStats.mNumTraversedNodes;

        if (node->IsVirtualLeaf())
        {
                RenderNode(node);

                if (mShowBounds)
                        mBvh->RenderBoundsForViz(node, mRenderState, mUseTightBounds);
        }
        else 
        {
                // for non leafs this renders only the bounding volume (if the flag is set)
                BvhInterior *interior = static_cast<BvhInterior *>(node);

                EnqueueNode(interior->GetFront());
                EnqueueNode(interior->GetBack());
        }
}


void RenderTraverser::RenderNode(BvhNode *node)
{
        // test if node was already rendered in this frame
        if (node->GetLastRenderedFrame() != mFrameId)
        {
                if (mRenderState->SetMode(RenderState::RENDER))
                        ++ mStats.mNumStateChanges;
                
                node->SetLastRenderedFrame(mFrameId);

                int geometrySize;
                SceneEntity **entities = mBvh->GetGeometry(node, geometrySize);

                mStats.mNumRenderedGeometry += geometrySize;
                ++ mStats.mNumRenderedNodes;
                
                for (int i = 0; i < geometrySize; ++ i)
                {
                        SceneEntity *ent = entities[i];
                
                        mStats.mNumRenderedTriangles += ent->CountNumTriangles();

                        if (mUseRenderQueue)
                                mRenderQueue->Enqueue(ent);
                        else
                                ent->Render(mRenderState);

                        // store the visible entities for rendering in the second pass
                        if (mUseDepthPass) mVisibleObjects.push_back(ent);
                }

                // store the max distance in the scene for later use
                float maxDist = mBvh->CalcMaxDistance(node);

                if (maxDist > mMaxVisibleDistance)
                        mMaxVisibleDistance = maxDist;
        }
}


void RenderTraverser::SetHierarchy(Bvh *bvh)
{
        mBvh = bvh;
}


void RenderTraverser::SetRenderState(RenderState *state)
{
        mRenderState = state;
}


void RenderTraverser::RenderScene()
{
        mVisibleObjects.clear();
        mMaxVisibleDistance = .0f;

        ++ mFrameId;

        mBvh->InitFrame(mCamera);

        mStats.Reset();
        mQueryHandler.ResetQueries();

        // add root node to queue
        EnqueueNode(mBvh->GetRoot());


        ///////////
        //-- the actual rendering algorithm

        Traverse();

        // render the contents of the render queue
        if (mUseRenderQueue) ApplyRenderQueue();
        
        // reset the render state
        mRenderState->Reset();
}


void RenderTraverser::SetUseRenderQueue(bool useRenderQueue)
{
        mUseRenderQueue = useRenderQueue;
        //std::cout << "using render queue: " << mUseRenderQueue << std::endl;
}


void RenderTraverser::SetUseDepthPass(bool b)
{
        mUseDepthPass = b;
}


void RenderTraverser::SetVisibilityThreshold(int threshold)
{
        mVisibilityThreshold = threshold;
}


void RenderTraverser::SetUseOptimization(bool useOptimization)
{
        mUseOptimization = useOptimization;
        //cout << "using optimization: " << mUseOptimization << endl;
}


void RenderTraverser::SetAssumedVisibleFrames(int assumedVisibleFrames)
{
        mAssumedVisibleFrames = assumedVisibleFrames;
}


void RenderTraverser::SetMaxBatchSize(int batchSize)
{
        mMaxBatchSize = batchSize;
}


void RenderTraverser::SetUseMultiQueries(bool useMultiQueries)
{
        mUseMultiQueries = useMultiQueries;
        //cout << "using multiqueries: " << mUseMultiQueries << endl;
}


void RenderTraverser::SetShowBounds(bool showBounds)
{
        mShowBounds = showBounds;
}


void RenderTraverser::SetUseTightBounds(bool useTightBounds)
{
        mUseTightBounds = useTightBounds;
        //cout << "using tight bounds: " << useTightBounds << endl;
}


OcclusionQuery *RenderTraverser::IssueOcclusionQuery(BvhNode *node)
{
        OcclusionQuery *query = mQueryHandler.RequestQuery();
        query->AddNode(node);

        IssueOcclusionQuery(*query);

        return query;
}


void RenderTraverser::IssueOcclusionQuery(const OcclusionQuery &query)
{
        ++ mStats.mNumIssuedQueries;

        // render pending objects before changing to query mode
        if (mUseRenderQueue && (mRenderState->GetMode() == RenderState::RENDER))
        {
                ApplyRenderQueue();
        }

        query.BeginQuery();

        // change to query mode and render box
        if (mRenderState->SetMode(RenderState::QUERY))
        {
                ++ mStats.mNumStateChanges;
        }

        mBvh->RenderBounds(query.GetNodes(), mRenderState, mUseTightBounds);
        
        query.EndQuery();
}


void RenderTraverser::ApplyRenderQueue()
{
        if (mRenderState->SetMode(RenderState::RENDER))
                ++ mStats.mNumStateChanges;
                 
        if (mRenderQueue->GetSize() > 0)
        {
                ++ mStats.mNumBatches;
                mRenderQueue->Apply();
        }
}


}