private KtxHeader CreateKtxHeader(int format, Size size)
{
var glFormat = (GlInternalFormat)format;
switch (glFormat)
{
case GlInternalFormat.GlCompressedRgb8PunchthroughAlpha1Etc2:
case GlInternalFormat.GlCompressedRgba8Etc2Eac:
return(KtxHeader.InitializeCompressed(size.Width, size.Height, glFormat, GlFormat.GlRgba));
case GlInternalFormat.GlCompressedRgb8Etc2:
return(KtxHeader.InitializeCompressed(size.Width, size.Height, glFormat, GlFormat.GlRgb));
default:
throw new InvalidOperationException($"{glFormat} is not supported for saving.");
}
}
/// <summary>
/// Encodes all cubemap faces and mipmap levels into a Ktx file.
/// Order is +X, -X, +Y, -Y, +Z, -Z. Back maps to positive Z and front to negative Z.
/// </summary>
public KtxFile EncodeCubeMapToKtx(Image <Rgba32> right, Image <Rgba32> left, Image <Rgba32> top, Image <Rgba32> down,
Image <Rgba32> back, Image <Rgba32> front)
{
KtxFile output;
IBcBlockEncoder compressedEncoder = null;
IRawEncoder uncompressedEncoder = null;
if (right.Width != left.Width || right.Width != top.Width || right.Width != down.Width ||
right.Width != back.Width || right.Width != front.Width ||
right.Height != left.Height || right.Height != top.Height || right.Height != down.Height ||
right.Height != back.Height || right.Height != front.Height)
{
throw new ArgumentException("All input images of a cubemap should be the same size.");
}
Image <Rgba32>[] faces = new[] { right, left, top, down, back, front };
if (OutputOptions.format.IsCompressedFormat())
{
compressedEncoder = GetEncoder(OutputOptions.format);
if (compressedEncoder == null)
{
throw new NotSupportedException($"This format is not supported: {OutputOptions.format}");
}
output = new KtxFile(
KtxHeader.InitializeCompressed(right.Width, right.Height,
compressedEncoder.GetInternalFormat(),
compressedEncoder.GetBaseInternalFormat()));
}
else
{
uncompressedEncoder = GetRawEncoder(OutputOptions.format);
output = new KtxFile(
KtxHeader.InitializeUncompressed(right.Width, right.Height,
uncompressedEncoder.GetGlType(),
uncompressedEncoder.GetGlFormat(),
uncompressedEncoder.GetGlTypeSize(),
uncompressedEncoder.GetInternalFormat(),
uncompressedEncoder.GetBaseInternalFormat()));
}
uint numMipMaps = (uint)OutputOptions.maxMipMapLevel;
if (!OutputOptions.generateMipMaps)
{
numMipMaps = 1;
}
uint mipLength = MipMapper.CalculateMipChainLength(right.Width, right.Height, numMipMaps);
for (uint i = 0; i < mipLength; i++)
{
output.MipMaps.Add(new KtxMipmap(0, 0, 0, (uint)faces.Length));
}
for (int f = 0; f < faces.Length; f++)
{
var mipChain = MipMapper.GenerateMipChain(faces[f], ref numMipMaps);
for (int i = 0; i < numMipMaps; i++)
{
byte[] encoded = null;
if (OutputOptions.format.IsCompressedFormat())
{
var blocks = ImageToBlocks.ImageTo4X4(mipChain[i].Frames[0], out int blocksWidth, out int blocksHeight);
encoded = compressedEncoder.Encode(blocks, blocksWidth, blocksHeight, OutputOptions.quality,
!Debugger.IsAttached && Options.multiThreaded);
}
else
{
encoded = uncompressedEncoder.Encode(mipChain[i].GetPixelSpan());
}
if (f == 0)
{
output.MipMaps[i] = new KtxMipmap((uint)encoded.Length,
(uint)mipChain[i].Width,
(uint)mipChain[i].Height, (uint)faces.Length);
}
output.MipMaps[i].Faces[f] = new KtxMipFace(encoded,
(uint)mipChain[i].Width,
(uint)mipChain[i].Height);
}
foreach (var image in mipChain)
{
image.Dispose();
}
}
output.Header.NumberOfFaces = (uint)faces.Length;
output.Header.NumberOfMipmapLevels = mipLength;
return(output);
}
/// <summary>
/// Encodes all mipmap levels into a Ktx file.
/// </summary>
public KtxFile EncodeToKtx(Image <Rgba32> inputImage)
{
KtxFile output;
IBcBlockEncoder compressedEncoder = null;
IRawEncoder uncompressedEncoder = null;
if (OutputOptions.format.IsCompressedFormat())
{
compressedEncoder = GetEncoder(OutputOptions.format);
if (compressedEncoder == null)
{
throw new NotSupportedException($"This format is not supported: {OutputOptions.format}");
}
output = new KtxFile(
KtxHeader.InitializeCompressed(inputImage.Width, inputImage.Height,
compressedEncoder.GetInternalFormat(),
compressedEncoder.GetBaseInternalFormat()));
}
else
{
uncompressedEncoder = GetRawEncoder(OutputOptions.format);
output = new KtxFile(
KtxHeader.InitializeUncompressed(inputImage.Width, inputImage.Height,
uncompressedEncoder.GetGlType(),
uncompressedEncoder.GetGlFormat(),
uncompressedEncoder.GetGlTypeSize(),
uncompressedEncoder.GetInternalFormat(),
uncompressedEncoder.GetBaseInternalFormat()));
}
uint numMipMaps = (uint)OutputOptions.maxMipMapLevel;
if (!OutputOptions.generateMipMaps)
{
numMipMaps = 1;
}
var mipChain = MipMapper.GenerateMipChain(inputImage, ref numMipMaps);
for (int i = 0; i < numMipMaps; i++)
{
byte[] encoded = null;
if (OutputOptions.format.IsCompressedFormat())
{
var blocks = ImageToBlocks.ImageTo4X4(mipChain[i].Frames[0], out int blocksWidth, out int blocksHeight);
encoded = compressedEncoder.Encode(blocks, blocksWidth, blocksHeight, OutputOptions.quality,
!Debugger.IsAttached && Options.multiThreaded);
}
else
{
encoded = uncompressedEncoder.Encode(mipChain[i].GetPixelSpan());
}
output.MipMaps.Add(new KtxMipmap((uint)encoded.Length,
(uint)inputImage.Width,
(uint)inputImage.Height, 1));
output.MipMaps[i].Faces[0] = new KtxMipFace(encoded,
(uint)inputImage.Width,
(uint)inputImage.Height);
}
foreach (var image in mipChain)
{
image.Dispose();
}
output.Header.NumberOfFaces = 1;
output.Header.NumberOfMipmapLevels = numMipMaps;
return(output);
}