static void convert_dxt1_b8g8r8a8_unorm(const BYTE *src, BYTE *dst, UINT src_row_pitch, UINT src_slice_pitch,
        UINT dst_row_pitch, UINT dst_slice_pitch, UINT width, UINT height, UINT depth);
static void convert_dxt3_b8g8r8a8_unorm(const BYTE *src, BYTE *dst, UINT src_row_pitch, UINT src_slice_pitch,
        UINT dst_row_pitch, UINT dst_slice_pitch, UINT width, UINT height, UINT depth);
static void convert_dxt5_b8g8r8a8_unorm(const BYTE *src, BYTE *dst, UINT src_row_pitch, UINT src_slice_pitch,
        UINT dst_row_pitch, UINT dst_slice_pitch, UINT width, UINT height, UINT depth);

struct wined3d_format_decompress_info
{
    enum wined3d_format_id id;
    DWORD flags;
    void (*decompress)(const BYTE *src, BYTE *dst, unsigned int src_row_pitch, unsigned int src_slice_pitch,
            unsigned int dst_row_pitch, unsigned int dst_slice_pitch,
            unsigned int width, unsigned int height, unsigned int depth);
};

static const struct wined3d_format_decompress_info format_decompress_info[] =
{
    {WINED3DFMT_DXT1,      WINED3DFMT_FLAG_DECOMPRESS, convert_dxt1_b8g8r8a8_unorm},
    {WINED3DFMT_DXT2,      WINED3DFMT_FLAG_DECOMPRESS, convert_dxt3_b8g8r8a8_unorm},
    {WINED3DFMT_DXT3,      WINED3DFMT_FLAG_DECOMPRESS, convert_dxt3_b8g8r8a8_unorm},
    {WINED3DFMT_DXT4,      WINED3DFMT_FLAG_DECOMPRESS, convert_dxt5_b8g8r8a8_unorm},
    {WINED3DFMT_DXT5,      WINED3DFMT_FLAG_DECOMPRESS, convert_dxt5_b8g8r8a8_unorm},
    {WINED3DFMT_BC1_UNORM, WINED3DFMT_FLAG_DECOMPRESS, convert_dxt1_b8g8r8a8_unorm},
    {WINED3DFMT_BC2_UNORM, WINED3DFMT_FLAG_DECOMPRESS, convert_dxt3_b8g8r8a8_unorm},
    {WINED3DFMT_BC3_UNORM, WINED3DFMT_FLAG_DECOMPRESS, convert_dxt5_b8g8r8a8_unorm},
};

---This part is in function init_format_base_info(struct wined3d_gl_info *gl_info)

    for (i = 0; i < ARRAY_SIZE(format_decompress_info); ++i)
    {
        if (!(format = get_format_internal(gl_info, format_decompress_info[i].id)))
            goto fail;

        format->flags[WINED3D_GL_RES_TYPE_TEX_3D] |= format_decompress_info[i].flags;
        format->decompress = format_decompress_info[i].decompress;

        if (format->decompress)
            FIXME("format->decompress is fine here.\n");
    }