[MetaHook] Load TGA texture to OpenGL

This function load a *.tga texture file and convert to OpenGL pixel format, uncompress only.

 #pragma pack(1)

 struct TgaHeader
 {
     unsigned char m_IDLength;
     unsigned char m_ColorMapType;
     unsigned char m_ImageType;
     unsigned short m_CMapStart;
     unsigned short m_CMapLength;
     unsigned char m_CMapDepth;
     unsigned short m_XOffset;
     unsigned short m_YOffset;
     unsigned short m_Width;
     unsigned short m_Height;
     unsigned char m_PixelDepth;
     unsigned char m_ImageDescriptor;
 };

 #pragma pack()

 bool LoadTGA(const char *pszFileName, unsigned char *pBuffer, int iBufferSize, int *pInternalFormat, int *pWidth, int *pHeight)
 {
     FileHandle_t pFile = g_pFileSystem->Open(pszFileName, "rb");

     if (!pFile)
         return false;

     TgaHeader Header;
     memset(&Header, , sizeof(Header));

     g_pFileSystem->Read(&Header, sizeof(Header), pFile);

     if (Header.m_ImageType != )
     {
         g_pFileSystem->Close(pFile);
         return false;
     }

     if (Header.m_PixelDepth !=  && Header.m_PixelDepth != )
     {
         g_pFileSystem->Close(pFile);
         return false;
     }

     uint32 iPixelSize, iImageSize;

     switch (Header.m_PixelDepth)
     {
     case :
         iPixelSize = ;
         *pInternalFormat = GL_RGB;
         break;
     case :
         iPixelSize = ;
         *pInternalFormat = GL_RGBA;
         break;
     }

     iImageSize = Header.m_Width * Header.m_Height * iPixelSize;

     if (iImageSize > (uint32)iBufferSize)
     {
         g_pFileSystem->Close(pFile);
         return false;
     }

     uint32 iLineSize = Header.m_Width * iPixelSize;
     uint32 iLinePos;

     for (uint32 y = ; y < Header.m_Height; ++y)
     {
         iLinePos = (Header.m_Height - y - ) * iLineSize;
         g_pFileSystem->Read(&pBuffer[iLinePos], iLineSize, pFile);
     }

     for (uint32 i = ; i < iImageSize; i += iPixelSize)
     {
         pBuffer[i + ] ^= pBuffer[i + ];
         pBuffer[i + ] ^= pBuffer[i + ];
         pBuffer[i + ] ^= pBuffer[i + ];
     }

     *pWidth = Header.m_Width;
     *pHeight = Header.m_Height;

     g_pFileSystem->Close(pFile);
     return true;
 }