private static uint GetVtfHighResFormatValue(DxtImageFormat imageFormat)
{
// If we use FormatDxt1OneBitAlpha, game engines will not interperate the image correctly.
// Just use Dxt1 without the alpha flag.
return(imageFormat switch
{
DxtImageFormat.Dxt5 => VtfConstants.FormatDxt5,
DxtImageFormat.Dxt1OneBitAlpha => VtfConstants.FormatDxt1,
_ => throw new NotImplementedException($"No case added for {nameof(DxtImageFormat)}.{imageFormat}."),
});
private static void EnsureStreamCapacityIfPossible(Stream stream, DxtImageFormat imageFormat, ICollection <Image <Rgba32> > images)
{
var neededBytes = (int)VtfConstants.HeaderSize + CalculateSizeInBytes(imageFormat, images);
if (stream is MemoryStream memStream)
{
memStream.Capacity = neededBytes;
}
else if (stream is FileStream fileStream)
{
fileStream.SetLength(neededBytes);
}
}
