source: GTP/trunk/Lib/Vis/OnlineCullingCHC/OGRE/src/OgrePlatformHierarchyInterface.cpp @ 1495

#include <OgreCamera.h>
#include <OgreLogManager.h>
#include <OgreSubEntity.h>
#include <OgreEntity.h>
#include <OgreMovableObject.h>
#include <OgreMaterialManager.h>
#include "OgreSolidBoundingBox.h"
#include "OgrePlatformHierarchyInterface.h"
#include "OgrePlatformOcclusionQuery.h"

namespace Ogre {

//-----------------------------------------------------------------------
PlatformHierarchyInterface::PlatformHierarchyInterface(SceneManager *sm, 
                                                                                                           RenderSystem *rsys):
mSceneManager(sm), 
mRenderSystem(rsys), 
mSolidBoundingBox(NULL), 
mCamera(NULL), 
mCullCamera(NULL), 
mOnlyShadowCasters(false), 
mLeavePassesInQueue(0),
mIsBoundingBoxQuery(false),
mCameraPosition(Vector3(0, 0, 0))
{
}
//-----------------------------------------------------------------------
void PlatformHierarchyInterface::CreateNodeVizMaterials()
{
        // material for frustum culled nodes
        MaterialPtr mat = MaterialManager::getSingleton().getByName("FrustumCulledNodesMaterial");
        
        if (mat.isNull())
        {
                mat = MaterialManager::getSingleton().create("FrustumCulledNodesMaterial", 
                        ResourceGroupManager::DEFAULT_RESOURCE_GROUP_NAME);
                mat->createTechnique()->createPass();
                
                mat->getTechnique(0)->getPass(0)->setAmbient(1, 0, 0);
                mat->getTechnique(0)->getPass(0)->setLightingEnabled(true);
                //mat->getTechnique(0)->getPass(0)->setDepthCheckEnabled(false);
                mat->load();
        }

        // material for query culled nodes
        mat = MaterialManager::getSingleton().getByName("QueryCulledNodesMaterial");

        if (mat.isNull())
        {
                mat = MaterialManager::getSingleton().create("QueryCulledNodesMaterial", 
                        ResourceGroupManager::DEFAULT_RESOURCE_GROUP_NAME);
                mat->createTechnique()->createPass();
                
                mat->getTechnique(0)->getPass(0)->setAmbient(0, 0, 1);
                mat->getTechnique(0)->getPass(0)->setLightingEnabled(true);
                mat->load();
        }

        // material for scene nodes
        /*mat = MaterialManager::getSingleton().getByName("SceneNodesMaterial");

        if (mat.isNull())
        {
                mat = MaterialManager::getSingleton().create("SceneNodesMaterial", 
                        ResourceGroupManager::DEFAULT_RESOURCE_GROUP_NAME);
                mat->createTechnique()->createPass();
                
                mat->getTechnique(0)->getPass(0)->setAmbient(1, 1, 0);
                mat->getTechnique(0)->getPass(0)->setLightingEnabled(true);
                mat->load();
        }*/
}
//-----------------------------------------------------------------------
PlatformHierarchyInterface::~PlatformHierarchyInterface()
{
        ResetQueries();
        OGRE_DELETE(mSolidBoundingBox);
}
//-----------------------------------------------------------------------
void PlatformHierarchyInterface::ResetQueries()
{
        OcclusionQueryContainer::iterator it, it_end = mOcclusionQueries.end();
        for (it = mOcclusionQueries.begin(); it != it_end; ++ it)
        {
                PlatformOcclusionQuery *query = *it;
                OGRE_DELETE(query);
        }

        mCurrentTestIdx = 0;
    mOcclusionQueries.clear();
}
//-----------------------------------------------------------------------
void PlatformHierarchyInterface::RenderBoundingBox(AxisAlignedBox *box)
{
        static RenderOperation ro;

        SolidBoundingBox *solidBox = GetSolidBoundingBox();
        
        mRenderSystem->_setWorldMatrix(Ogre::Matrix4::IDENTITY);
        mSceneManager->useRenderableViewProjModeWrapper(solidBox);
        // HACK! (mySetPass should be setPass)
        // set no depth write, no color, no lighting material
        mSceneManager->setPassWrapper(solidBox->getTechnique()->getPass(0));
        //mSceneManager->_setPass(solidBox->getTechnique()->getPass(0)); 
        //SetOcclusionPass();

        solidBox->SetupBoundingBoxVertices(*box);
                                
        solidBox->getRenderOperation(ro);
        ro.srcRenderable = solidBox;
        mRenderSystem->_render(ro);
}
//-----------------------------------------------------------------------
void PlatformHierarchyInterface::SetCamera(Ogre::Camera *cam)
{
        mCamera = cam;
}
//-----------------------------------------------------------------------
void PlatformHierarchyInterface::SetCullCamera(Ogre::Camera *cullCam)
{
        mCullCamera = cullCam;
}
//-----------------------------------------------------------------------
GtpVisibility::OcclusionQuery *PlatformHierarchyInterface::GetNextOcclusionQuery()
{
        // create new query if there is no query left
        if (mCurrentTestIdx == mOcclusionQueries.size())
        {
                mOcclusionQueries.push_back(new PlatformOcclusionQuery(mRenderSystem));
        }

        std::stringstream d;
        d << "resizing queries: " << (int)mOcclusionQueries.size() << std::endl;
        LogManager::getSingleton().logMessage(d.str());
        
        return mOcclusionQueries[mCurrentTestIdx ++];
}
//-----------------------------------------------------------------------
void PlatformHierarchyInterface::InitTraversal(Camera *cam, Camera *cullCam, 
                                                                                           int leavePassesInQueue)
{
        GtpVisibility::HierarchyInterface::InitTraversal();
        
        mSavedNode = NULL;
        mLeavePassesInQueue = leavePassesInQueue;

        mCamera = cam;
        // set culling camera for visualization
        mCullCamera = cullCam ? cullCam : cam;

        mCameraPosition = mCullCamera->getDerivedPosition();
        // create materials for node visualization
        CreateNodeVizMaterials();
}
//-----------------------------------------------------------------------
void PlatformHierarchyInterface::SetSceneManager(SceneManager *sm)
{
        mSceneManager = sm;
}
//-----------------------------------------------------------------------
void PlatformHierarchyInterface::SetRenderSystem(RenderSystem *rsys)
{
        mRenderSystem = rsys;
}
//-----------------------------------------------------------------------
bool PlatformHierarchyInterface::CheckFrustumVisible(GtpVisibility::HierarchyNode *node, 
                                                                                                         bool &intersects)
{
#ifdef GTP_VISIBILITY_MODIFIED_OGRE
        return mCullCamera->isVisible(*GetBoundingBox(node), intersects);
#else
        return true;
#endif
}
//-----------------------------------------------------------------------
GtpVisibility::OcclusionQuery *PlatformHierarchyInterface::IssueNodeOcclusionQuery(
        GtpVisibility::HierarchyNode *node, const bool wasVisible) 
{
        // get next available test id
        GtpVisibility::OcclusionQuery *query = GetNextOcclusionQuery();

        //-- the actual query test
        query->BeginQuery();
        
        // if node is leaf and was visible => will be rendered anyway.
        // In this case we can also test with the real geometry.
        // If camera for culling is different from camera for rendering or only solids 
        // will be rendereded => cannot optimize
        if (mTestGeometryForVisibleLeaves && (mCamera == mCullCamera) && wasVisible && IsLeaf(node)) 
        {
                RenderNode(node);
        }
        else
        {
                // this information is used e.g., by the scene graph, because the bounding box
                // must be treated differently to the scene geometry during rendering
                mIsBoundingBoxQuery = true;
                RenderBoundingBox(GetBoundingBox(node));

                mIsBoundingBoxQuery = false;
        }

        query->EndQuery();
        
        return query;
}
//-----------------------------------------------------------------------
GtpVisibility::OcclusionQuery *PlatformHierarchyInterface::IssuePatchOcclusionQuery(
        GtpVisibility::Patch *patch)
{
        // get next available test id
        GtpVisibility::OcclusionQuery *query = GetNextOcclusionQuery();

        //-- the actual query test
        query->BeginQuery();
        
        RenderPatch(patch);

        query->EndQuery();

        return query;
}
//-----------------------------------------------------------------------
GtpVisibility::OcclusionQuery *PlatformHierarchyInterface::IssueMeshOcclusionQuery(
        GtpVisibility::Mesh *mesh)
{
        // get next available test id
        GtpVisibility::OcclusionQuery *query = GetNextOcclusionQuery();
        
        ////////
        //-- the actual query test

        query->BeginQuery();
        RenderGeometry(mesh);
        query->EndQuery();

        return query;
}
//-----------------------------------------------------------------------
/*void PlatformHierarchyInterface::SetOcclusionPass()
{
    // disable vertex and fragment program
        mRenderSystem->unbindGpuProgram(GPT_VERTEX_PROGRAM);
        mRenderSystem->unbindGpuProgram(GPT_FRAGMENT_PROGRAM);
        
        // disable lighting
        mRenderSystem->setLightingEnabled(false);

    // Disable remaining texture units
    mRenderSystem->_disableTextureUnitsFrom(0);

    //--Set up non-texture related material settings
   
        // Depth buffer settings
        mRenderSystem->_setDepthBufferParams(true, false, CMPF_LESS_EQUAL);
        // Set colour write mode off
        mRenderSystem->_setColourBufferWriteEnabled(false, false, false, false);
}*/
//-----------------------------------------------------------------------
SolidBoundingBox *PlatformHierarchyInterface::GetSolidBoundingBox()
{
        if (!mSolidBoundingBox)
                mSolidBoundingBox = new SolidBoundingBox;

        return mSolidBoundingBox;
}
//-----------------------------------------------------------------------
void PlatformHierarchyInterface::SetOnlyShadowCasters(bool onlyShadowCasters)
{
        mOnlyShadowCasters = onlyShadowCasters;
}
//-----------------------------------------------------------------------
bool PlatformHierarchyInterface::GetOnlyShadowCasters()
{
        return mOnlyShadowCasters;
}
//-----------------------------------------------------------------------
bool PlatformHierarchyInterface::GetTestGeometryForVisibleLeaves()
{
        return mTestGeometryForVisibleLeaves;
}
//-----------------------------------------------------------------------
bool PlatformHierarchyInterface::IsBoundingBoxQuery()
{
        return mIsBoundingBoxQuery;
}
//-----------------------------------------------------------------------
void PlatformHierarchyInterface::RenderGeometry(GtpVisibility::Mesh *geom)
{
        mSceneManager->_renderMovableObject(geom, mLeavePassesInQueue);
}
//-----------------------------------------------------------------------
void PlatformHierarchyInterface::RenderPatch(GtpVisibility::Patch *patch)
{
        mSceneManager->_renderSingleRenderable(patch);
}
//-----------------------------------------------------------------------
SceneManager *PlatformHierarchyInterface::GetSceneManager()
{
        return mSceneManager;
}
//-----------------------------------------------------------------------
RenderSystem *PlatformHierarchyInterface::GetRenderSystem()
{
        return mRenderSystem;
}

} // namespace Ogre