public static (string, IDxt <IImage>) ReadDds(IFile ddsFile)
{
using var ddsStream = ddsFile.OpenRead();
var er = new EndianBinaryReader(ddsStream, Endianness.LittleEndian);
er.AssertString("DDS ");
er.AssertInt32(124); // size
var flags = er.ReadInt32();
var width = er.ReadInt32();
var height = er.ReadInt32();
var pitchOrLinearSize = er.ReadInt32();
var depth = er.ReadInt32();
// TODO: Read others
var mipmapCount = er.ReadInt32();
var reserved1 = er.ReadInt32s(11);
// DDS_PIXELFORMAT
er.AssertInt32(32); // size
var pfFlags = er.ReadInt32();
var pfFourCc = er.ReadString(4);
var pfRgbBitCount = er.ReadInt32();
var pfRBitMask = er.ReadInt32();
var pfGBitMask = er.ReadInt32();
var pfBBitMask = er.ReadInt32();
var pfABitMask = er.ReadInt32();
var caps1 = er.ReadInt32();
var caps2 = er.ReadInt32();
var isCubeMap = (caps2 & 0x200) != 0;
var hasPositiveX = (caps2 & 0x400) != 0;
var hasNegativeX = (caps2 & 0x800) != 0;
var hasPositiveY = (caps2 & 0x1000) != 0;
var hasNegativeY = (caps2 & 0x2000) != 0;
var hasPositiveZ = (caps2 & 0x4000) != 0;
var hasNegativeZ = (caps2 & 0x8000) != 0;
var hasVolume = (caps2 & 0x200000) != 0;
var sideCount = new[] {
hasPositiveX, hasNegativeX,
hasPositiveY, hasNegativeY,
hasPositiveZ, hasNegativeZ
}.Count(b => b);
sideCount = Math.Max(1, sideCount);
var queue = new Queue <CubeMapSide>();
if (hasPositiveX)
{
queue.Enqueue(CubeMapSide.POSITIVE_X);
}
if (hasNegativeX)
{
queue.Enqueue(CubeMapSide.NEGATIVE_X);
}
if (hasPositiveY)
{
queue.Enqueue(CubeMapSide.POSITIVE_Y);
}
if (hasNegativeY)
{
queue.Enqueue(CubeMapSide.NEGATIVE_Y);
}
if (hasPositiveZ)
{
queue.Enqueue(CubeMapSide.POSITIVE_Z);
}
if (hasNegativeZ)
{
queue.Enqueue(CubeMapSide.NEGATIVE_Z);
}
er.Position = 128;
switch (pfFourCc)
{
case "q\0\0\0": {
var q000Text = "a16b16g16r16";
var hdrCubeMap = new CubeMapImpl <IList <float> >();
for (var s = 0; s < sideCount; s++)
{
var hdrMipMap = new MipMap <IList <float> >();
for (var i = 0; i < mipmapCount; ++i)
{
var mmWidth = width >> i;
var mmHeight = height >> i;
var hdr = DecompressA16B16G16R16F(er, mmWidth, mmHeight);
hdrMipMap.AddLevel(
new MipMapLevel <IList <float> >(hdr, mmWidth, mmHeight));
}
if (!isCubeMap)
{
return(
q000Text,
new DxtImpl <IImage>(
ToneMapAndConvertHdrMipMapsToBitmap(hdrMipMap)));
}
var side = queue.Dequeue();
switch (side)
{
case CubeMapSide.POSITIVE_X: {
hdrCubeMap.PositiveX = hdrMipMap;
break;
}
case CubeMapSide.NEGATIVE_X: {
hdrCubeMap.NegativeX = hdrMipMap;
break;
}
case CubeMapSide.POSITIVE_Y: {
hdrCubeMap.PositiveY = hdrMipMap;
break;
}
case CubeMapSide.NEGATIVE_Y: {
hdrCubeMap.NegativeY = hdrMipMap;
break;
}
case CubeMapSide.POSITIVE_Z: {
hdrCubeMap.PositiveZ = hdrMipMap;
break;
}
case CubeMapSide.NEGATIVE_Z: {
hdrCubeMap.NegativeZ = hdrMipMap;
break;
}
default: throw new ArgumentOutOfRangeException();
}
}
return(q000Text,
new DxtImpl <IImage>(
ToneMapAndConvertHdrCubemapToBitmap(hdrCubeMap)));
}
default: {
ddsStream.Position = 0;
return(pfFourCc,
new DxtImpl <IImage>(new DdsReader().Read(ddsStream)));
}
}
}