/// <summary>
/// Converts texture data to a format and layout that is supported by the host GPU.
/// </summary>
/// <param name="data">Data to be converted</param>
/// <returns>Converted data</returns>
private ReadOnlySpan <byte> ConvertToHostCompatibleFormat(ReadOnlySpan <byte> data)
{
if (Info.IsLinear)
{
data = LayoutConverter.ConvertLinearStridedToLinear(
Info.Width,
Info.Height,
Info.FormatInfo.BlockWidth,
Info.FormatInfo.BlockHeight,
Info.Stride,
Info.FormatInfo.BytesPerPixel,
data);
}
else
{
data = LayoutConverter.ConvertBlockLinearToLinear(
Info.Width,
Info.Height,
_depth,
Info.Levels,
_layers,
Info.FormatInfo.BlockWidth,
Info.FormatInfo.BlockHeight,
Info.FormatInfo.BytesPerPixel,
Info.GobBlocksInY,
Info.GobBlocksInZ,
Info.GobBlocksInTileX,
_sizeInfo,
data);
}
// Handle compressed cases not supported by the host:
// - ASTC is usually not supported on desktop cards.
// - BC4/BC5 is not supported on 3D textures.
if (!_context.Capabilities.SupportsAstcCompression && Info.FormatInfo.Format.IsAstc())
{
if (!AstcDecoder.TryDecodeToRgba8P(
data.ToArray(),
Info.FormatInfo.BlockWidth,
Info.FormatInfo.BlockHeight,
Info.Width,
Info.Height,
_depth,
Info.Levels,
_layers,
out Span <byte> decoded))
{
string texInfo = $"{Info.Target} {Info.FormatInfo.Format} {Info.Width}x{Info.Height}x{Info.DepthOrLayers} levels {Info.Levels}";
Logger.Debug?.Print(LogClass.Gpu, $"Invalid ASTC texture at 0x{Info.GpuAddress:X} ({texInfo}).");
}
data = decoded;
}
else if (Target == Target.Texture3D && Info.FormatInfo.Format.IsBc4())
{
data = BCnDecoder.DecodeBC4(data, Info.Width, Info.Height, _depth, Info.Levels, _layers, Info.FormatInfo.Format == Format.Bc4Snorm);
}
else if (Target == Target.Texture3D && Info.FormatInfo.Format.IsBc5())
{
data = BCnDecoder.DecodeBC5(data, Info.Width, Info.Height, _depth, Info.Levels, _layers, Info.FormatInfo.Format == Format.Bc5Snorm);
}
return(data);
}
