HWIndex.h

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/**********************************************************************
*<
FILE: HWIndex.h

DESCRIPTION: Hardware Index Interface Implementation

CREATED BY: Peter Watje

HISTORY: Created June 13, 2008

Copyright 2008 Autodesk, Inc.  All rights reserved.

Use of this software is subject to the terms of the Autodesk license agreement 
provided at the time of installation or download, or which otherwise accompanies 
this software in either electronic or hard copy form.   

**********************************************************************/


#pragma once
#include "export.h"
#include "maxheap.h" 
#include "tab.h" 

namespace GFX_MESH
{

enum PrimitiveType { kLineList = 2, kTriangleList = 3};


class HWIndex32Bit : public  MaxHeapOperators
{
public:

    DllExport HWIndex32Bit(unsigned int indicesPerElement);


    DllExport void SetBuffer(DWORD *buffer);


    DllExport const unsigned int Count();


    DllExport DWORD& operator[](int i);
    DllExport const DWORD& operator[](int i) const;


private:
    int mCount;             //number of indices per element
    DWORD *mIndex;          //pointer to the actual raw index array
    static DWORD errorIndex;

};


class HWIndex16Bit : public  MaxHeapOperators
{
public:

    DllExport HWIndex16Bit(unsigned int indicesPerElement);


    DllExport void SetBuffer(WORD *buffer);


    DllExport const unsigned int Count();


    DllExport WORD& operator[](int i);
    DllExport const WORD& operator[](int i) const;

private:
    int mCount;     //number of indices per element
    WORD *mIndex;   //pointer to the actual raw index array
};


class HWIndexBuffer : public  MaxHeapOperators
{
public:


        DllExport HWIndexBuffer(unsigned int count, unsigned int indicesPerPrimitive, bool use16Bit);
        DllExport ~HWIndexBuffer();


        DllExport void FreeBuffer();


        DllExport const unsigned int NumberPrimitives();


        DllExport const unsigned int IndicesPerPrimitive();

        DllExport const unsigned int Size();


        DllExport bool SetNumberPrimitives(unsigned int ct);


        DllExport bool Is16Bit();



        DllExport  HWIndex32Bit GetHWIndex32Bit(int index);


        DllExport  HWIndex16Bit GetHWIndex16Bit(int index);



        DllExport  const DWORD *GetRawBufferPointer();

        DllExport  const WORD *GetRawBufferPointer16Bit();

private:

    PrimitiveType   mPrimitiveType;     //the primitive type

    int mPrimitiveCount;                    //Number of elements in the buffers
    int mIndicesPerPrimitive;       //Number of indices per element
    bool mUse16Bit;             //whether to use 16 or 32 bit index buffers
    Tab<DWORD> mIndices32Bit;           // the actual raw pointer to the 32 bit buffer
    Tab<WORD> mIndices16Bit;        // the actual raw pointer to the 16 bit buffer

};
}