source: GTP/trunk/App/Demos/Vis/FriendlyCulling/src/Geometry.cpp @ 3127

#include "Geometry.h"
#include "Triangle3.h"
#include "glInterface.h"
#include "RenderState.h"


#ifdef _CRT_SET
        #define _CRTDBG_MAP_ALLOC
        #include <stdlib.h>
        #include <crtdbg.h>

        // redefine new operator
        #define DEBUG_NEW new(_NORMAL_BLOCK, __FILE__, __LINE__)
        #define new DEBUG_NEW
#endif

using namespace std;

namespace CHCDemoEngine 
{

Geometry::Geometry(Vector3 *vertices, 
                                   Vector3 *normals,
                                   Texcoord2 *texcoords,
                                   int numVertices,
                                   bool delData,
                                   Vector3 *tangents):
mVertices(vertices), 
mNormals(normals), 
mTexCoords(texcoords),
mTangents(tangents),
mNumVertices(numVertices), 
mVboId(-1)
{
        mHasTexture = (mTexCoords != NULL);
        mHasTangents = (mTangents != NULL);

        Prepare();

        if (delData)
        {
                DEL_ARRAY_PTR(mVertices);
                DEL_ARRAY_PTR(mNormals);
                DEL_ARRAY_PTR(mTexCoords);
                DEL_ARRAY_PTR(mTangents);
        }
}


Geometry::~Geometry()
{
        DEL_ARRAY_PTR(mVertices);
        DEL_ARRAY_PTR(mNormals);
        DEL_ARRAY_PTR(mTexCoords);
        DEL_ARRAY_PTR(mTangents);

        // delete vbo
        glDeleteBuffersARB(1, &mVboId);
}

        
void Geometry::Prepare()
{
        CalcBoundingBox();

        int dataSize = mNumVertices * 6;

        if (mTexCoords) dataSize += mNumVertices * 2;
        if (mTangents) dataSize += mNumVertices * 3;

        float *data = new float[dataSize];

        for (int i = 0; i < mNumVertices; ++ i)
        {
                ((Vector3 *)data)[i] = mVertices[i];
                ((Vector3 *)data)[i + mNumVertices] = mNormals[i];
        }

        float *currentPData = data + mNumVertices * 6;

        if (mTangents)
        {
                for (int i = 0; i < mNumVertices; ++ i)
                        ((Vector3 *)data)[mNumVertices * 2 + i] = mTangents[i];

                for (int i = 0; i < 3; ++ i)
                        cout << ((Vector3 *)data)[mNumVertices * 2 + i] << " ";

                currentPData += mNumVertices * 3;
        }

        if (mTexCoords)
        {
                for (int i = 0; i < mNumVertices; ++ i)
                        ((Texcoord2 *)currentPData)[i] = mTexCoords[i];
        }


        glGenBuffersARB(1, &mVboId);
        glBindBufferARB(GL_ARRAY_BUFFER_ARB, mVboId);

        int currentPVbo = 0;

        glVertexPointer(3, GL_FLOAT, 0, (char *)NULL);

        currentPVbo += mNumVertices * sizeof(Vector3);
        glNormalPointer(GL_FLOAT, 0, (char *)NULL + currentPVbo);

        currentPVbo += mNumVertices * 2 * sizeof(Vector3);

        if (mTangents)
        {
                glColorPointer(3, GL_FLOAT, 0, (char *)NULL + currentPVbo);
                currentPVbo += mNumVertices * sizeof(Vector3);
        }

        if (mTexCoords)
        {
                glTexCoordPointer(2, GL_FLOAT, 0, (char *)NULL + currentPVbo);
        }

        glBufferDataARB(GL_ARRAY_BUFFER_ARB, dataSize * sizeof(float), 
                            (float *)data, GL_STATIC_DRAW_ARB);

        glBindBufferARB(GL_ARRAY_BUFFER_ARB, 0);

        // data handled by graphics driver from now on
        delete [] data;
}


void Geometry::Render(RenderState *state)
{
        if (mHasTangents)
                glEnableClientState(GL_COLOR_ARRAY);

        if (state->GetCurrentVboId() != mVboId)
        {
                glBindBufferARB(GL_ARRAY_BUFFER_ARB, mVboId);
                
                int currentPointer;

                glNormalPointer(GL_FLOAT, 0, (char *)NULL + mNumVertices * sizeof(Vector3));

                if (mHasTangents)
                {
                        glColorPointer(3, GL_FLOAT, 0, (char *)NULL + mNumVertices * sizeof(Vector3));
                        currentPointer = mNumVertices * 3 * sizeof(Vector3);
                }
                else
                        currentPointer = mNumVertices * 2 * sizeof(Vector3);

                if (mHasTexture)
                        glTexCoordPointer(2, GL_FLOAT, 0, (char *)NULL + currentPointer);

                glVertexPointer(3, GL_FLOAT, 0, (char *)NULL);  

                state->SetCurrentVboId(mVboId);

        }

        // don't render first degenerate index
        glDrawArrays(GL_TRIANGLES, 0, mNumVertices);

        if (mHasTangents)
                glDisableClientState(GL_COLOR_ARRAY);
}


void Geometry::CalcBoundingBox()
{
        mBoundingBox.Initialize();

        for (int i = 0; i < mNumVertices; ++ i)
        {
                mBoundingBox.Include(mVertices[i]);
        }
}


const AxisAlignedBox3& Geometry::GetBoundingBox() const
{
        return mBoundingBox;
}


}