source: GTP/trunk/Lib/Vis/OnlineCullingCHC/ObjReader/src/ObjManualMeshLoader.cpp @ 2645

#include "ObjManualMeshLoader.h"
#include "Triangle3.h"
#include "IntersectableWrapper.h"
#include "BvHierarchy.h"
#include "OgreLogManager.h"

#define USE_HBL_DISCARD 1

ObjManualMeshLoader::ObjManualMeshLoader(GtpVisibilityPreprocessor::BvhLeaf *obj):
mObject(obj)
{
}


ObjManualMeshLoader::~ObjManualMeshLoader()
{
}


void ObjManualMeshLoader::loadResource(Ogre::Resource *resource)
{
        using namespace Ogre;

        Mesh *mesh = (Mesh *) resource;
        SubMesh* submesh = mesh->createSubMesh();

        const int triCount = (int)mObject->mObjects.size();
        const int vertexCount = triCount * 3;

        // We must create the vertex data, indicating how many vertices there will be
        submesh->useSharedVertices = false;
        submesh->vertexData = new VertexData();
        submesh->vertexData->vertexStart = 0;
        submesh->vertexData->vertexCount = vertexCount;

        static const unsigned short source = 0;
        size_t offset = 0;

        // We must now declare what the vertex data contains
        VertexDeclaration* declaration = submesh->vertexData->vertexDeclaration;

        offset += declaration->addElement(source, offset, VET_FLOAT3, VES_POSITION).getSize();
        offset += declaration->addElement(source, offset, VET_FLOAT3, VES_NORMAL).getSize();
        //offset += declaration->addElement(source, offset, VET_FLOAT2,VES_TEXTURE_COORDINATES).getSize();

        HardwareVertexBufferSharedPtr vbuffer = HardwareBufferManager::getSingleton().
                createVertexBuffer(declaration->getVertexSize(source),
                                                   submesh->vertexData->vertexCount,
                                                   HardwareBuffer::HBU_STATIC_WRITE_ONLY);

    // we get access to the buffer to fill it.  During so we record the bounding box.
        AxisAlignedBox aabox;

        submesh->vertexData->vertexBufferBinding->setBinding(source, vbuffer);
#if USE_HBL_DISCARD
        float* vdata = static_cast<float*>(vbuffer->lock(HardwareBuffer::HBL_DISCARD));
#else
        float* vdata = static_cast<float *>(vbuffer->lock(HardwareBuffer::HBL_NORMAL));
#endif

        GtpVisibilityPreprocessor::ObjectContainer::
                const_iterator oit, oit_end = mObject->mObjects.end();

        for (oit = mObject->mObjects.begin(); oit != oit_end; ++ oit)
        {
                GtpVisibilityPreprocessor::TriangleIntersectable *tObj = 
                        static_cast<GtpVisibilityPreprocessor::TriangleIntersectable *>(*oit);
                
                const GtpVisibilityPreprocessor::Triangle3 tri = tObj->GetItem();
                const GtpVisibilityPreprocessor::Vector3 n = tri.GetNormal();

                for (int i = 0; i < 3; ++ i)
                {
                        Vector3 vtx(tri.mVertices[i].x, tri.mVertices[i].y, tri.mVertices[i].z);
                
                        *(vdata ++) = vtx.x;
                        *(vdata ++) = vtx.y;
                        *(vdata ++) = vtx.z;

                        *(vdata ++) = n.x;
                        *(vdata ++) = n.y;
                        *(vdata ++) = n.z;

                        aabox.merge(vtx);
                }
        }

        vbuffer->unlock();

#if 0
        RenderOperation rop;
        submesh->_getRenderOperation(rop);
        rop.useIndexes = false;
#endif


        //////
        //-- Creates the index data
    
        const int indexCount = vertexCount;

        submesh->indexData->indexStart = 0;
        submesh->operationType = RenderOperation::OT_TRIANGLE_LIST;

        // we use an index for every vertex
        submesh->indexData->indexCount = indexCount;
        submesh->indexData->indexBuffer =
            HardwareBufferManager::getSingleton().
                        createIndexBuffer(HardwareIndexBuffer::IT_16BIT,
                                                          submesh->indexData->indexCount,
                                                          HardwareBuffer::HBU_STATIC_WRITE_ONLY);

#if USE_HBL_DISCARD
        uint16* idata = static_cast<uint16 *>(submesh->indexData->indexBuffer->lock(HardwareBuffer::HBL_DISCARD));
#else
        uint16* idata = static_cast<uint16 *>(submesh->indexData->indexBuffer->lock(HardwareBuffer::HBL_NORMAL));
#endif
        for (int j = 0; j < indexCount; ++ j)
    {
                idata[j] = j;
    }
    
        submesh->indexData->indexBuffer->unlock();
        submesh->setMaterialName("BaseWhite"); 

        // indicate the bounding box
        mesh->_setBounds(aabox); 
        mesh->_setBoundingSphereRadius((aabox.getMaximum() - aabox.getMinimum()).length() / 2.0); 
}