[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, 0, sizeof(Header));

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

    if (Header.m_ImageType != 2)
    {
        g_pFileSystem->Close(pFile);
        return false;
    }

    if (Header.m_PixelDepth != 24 && Header.m_PixelDepth != 32)
    {
        g_pFileSystem->Close(pFile);
        return false;
    }

    uint32 iPixelSize, iImageSize;

    switch (Header.m_PixelDepth)
    {
    case 24:
        iPixelSize = 3;
        *pInternalFormat = GL_RGB;
        break;
    case 32:
        iPixelSize = 4;
        *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 = 0; y < Header.m_Height; ++y)
    {
        iLinePos = (Header.m_Height - y - 1) * iLineSize;
        g_pFileSystem->Read(&pBuffer[iLinePos], iLineSize, pFile);
    }

    for (uint32 i = 0; i < iImageSize; i += iPixelSize)
    {
        pBuffer[i + 0] ^= pBuffer[i + 2];
        pBuffer[i + 2] ^= pBuffer[i + 0];
        pBuffer[i + 0] ^= pBuffer[i + 2];
    }

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

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