ParaVertexBuffer.h

#pragma once
namespace ParaEngine
{
#ifdef USE_DIRECTX_RENDERER
    typedef IDirect3DVertexBuffer9* VertexBufferDevicePtr_type;
    typedef IDirect3DIndexBuffer9* IndexBufferDevicePtr_type;
#elif defined(USE_OPENGL_RENDERER)
    typedef GLuint VertexBufferDevicePtr_type;
    typedef GLuint IndexBufferDevicePtr_type;
#else 
    typedef int32_t VertexBufferDevicePtr_type;
    typedef int32_t IndexBufferDevicePtr_type;
#endif

    class ParaVertexBuffer
    {
    public:
        ParaVertexBuffer();
        ~ParaVertexBuffer();
        
        enum EnumBufferType
        {
            BufferType_VertexBuffer = 0,
            BufferType_IndexBuffer,
            BufferType_MemoryBuffer,
        };
    public:
        VertexBufferDevicePtr_type GetDevicePointer();

        IndexBufferDevicePtr_type GetDevicePointerAsIndexBuffer();
        char* GetMemoryPointer();

        bool CreateBuffer(uint32 nBufferSize, DWORD dwFormat = 0, DWORD dwUsage = 0, D3DPOOL dwPool = D3DPOOL_MANAGED);
        bool CreateIndexBuffer(uint32 nBufferSize, DWORD dwFormat = 0, DWORD dwUsage = 0);
        bool CreateMemoryBuffer(uint32 nBufferSize, DWORD dwFormat = 0, DWORD dwUsage = 0);

        void ReleaseBuffer();

        bool Lock(void** ppData, uint32 offsetToLock = 0, uint32 sizeToLock = 0, DWORD dwFlag = 0);
        void Unlock();

        uint32 GetBufferSize();

        bool IsValid() const;
        operator bool() const { return IsValid(); };
        bool operator !() const { return !IsValid(); };
        void RendererRecreated();
        void UploadMemoryBuffer(const char* pBuffer, int32 nBufSize = -1);
    protected:
        union {
            IndexBufferDevicePtr_type m_indexBuffer;
            VertexBufferDevicePtr_type m_vertexBuffer;
        };
        
        uint32 m_nBufferSize;
        // only valid between Lock and Unlock or type is BufferType_MemoryBuffer
        char* m_buffer;
        EnumBufferType m_bufferType;
    };

    class ParaIndexBuffer : public ParaVertexBuffer
    {
    public:
        bool CreateBuffer(uint32 nBufferSize, DWORD dwFormat = 0, DWORD dwUsage = 0);
        IndexBufferDevicePtr_type GetDevicePointer();
    };

    class ParaMemoryBuffer : public ParaVertexBuffer
    {
    public:
        bool CreateBuffer(uint32 nBufferSize, DWORD dwFormat = 0, DWORD dwUsage = 0);
        char* GetDevicePointer();
    };
    
}