public static KtxFile Load(Stream s, bool readKeyValuePairs)
{
using (BinaryReader br = new BinaryReader(s))
{
KtxHeader header = ReadStruct <KtxHeader>(br);
KtxKeyValuePair[] kvps = null;
if (readKeyValuePairs)
{
int keyValuePairBytesRead = 0;
List <KtxKeyValuePair> keyValuePairs = new List <KtxKeyValuePair>();
while (keyValuePairBytesRead < header.BytesOfKeyValueData)
{
int bytesRemaining = (int)(header.BytesOfKeyValueData - keyValuePairBytesRead);
KtxKeyValuePair kvp = ReadNextKeyValuePair(br, out int read);
keyValuePairBytesRead += read;
keyValuePairs.Add(kvp);
}
kvps = keyValuePairs.ToArray();
}
else
{
br.BaseStream.Seek(header.BytesOfKeyValueData, SeekOrigin.Current); // Skip over header data.
}
uint numberOfMipmapLevels = Math.Max(1, header.NumberOfMipmapLevels);
uint numberOfArrayElements = Math.Max(1, header.NumberOfArrayElements);
uint numberOfFaces = Math.Max(1, header.NumberOfFaces);
uint baseWidth = Math.Max(1, header.PixelWidth);
uint baseHeight = Math.Max(1, header.PixelHeight);
uint baseDepth = Math.Max(1, header.PixelDepth);
KtxMipmapLevel[] images = new KtxMipmapLevel[numberOfMipmapLevels];
for (int mip = 0; mip < numberOfMipmapLevels; mip++)
{
uint mipWidth = Math.Max(1, baseWidth / (uint)(Math.Pow(2, mip)));
uint mipHeight = Math.Max(1, baseHeight / (uint)(Math.Pow(2, mip)));
uint mipDepth = Math.Max(1, baseDepth / (uint)(Math.Pow(2, mip)));
uint imageSize = br.ReadUInt32();
uint arrayElementSize = imageSize / numberOfArrayElements;
KtxArrayElement[] arrayElements = new KtxArrayElement[numberOfArrayElements];
for (int arr = 0; arr < numberOfArrayElements; arr++)
{
uint faceSize = arrayElementSize / numberOfFaces;
KtxFace[] faces = new KtxFace[numberOfFaces];
for (int face = 0; face < numberOfFaces; face++)
{
faces[face] = new KtxFace(br.ReadBytes((int)faceSize));
}
arrayElements[arr] = new KtxArrayElement(faces);
}
images[mip] = new KtxMipmapLevel(
mipWidth,
mipHeight,
mipDepth,
imageSize,
arrayElementSize,
arrayElements);
uint mipPaddingBytes = 3 - ((imageSize + 3) % 4);
br.BaseStream.Seek(mipPaddingBytes, SeekOrigin.Current);
}
return(new KtxFile(header, kvps, images));
}
}
public static unsafe Texture LoadTexture(
GraphicsDevice gd,
ResourceFactory factory,
Stream assetStream,
PixelFormat format)
{
KtxFile ktxTex2D = Load(assetStream, false);
uint width = ktxTex2D.Header.PixelWidth;
uint height = ktxTex2D.Header.PixelHeight;
if (height == 0)
{
height = width;
}
uint arrayLayers = Math.Max(1, ktxTex2D.Header.NumberOfArrayElements);
uint mipLevels = Math.Max(1, ktxTex2D.Header.NumberOfMipmapLevels);
Texture ret = factory.CreateTexture(TextureDescription.Texture2D(
width, height, mipLevels, arrayLayers,
format, TextureUsage.Sampled));
Texture stagingTex = factory.CreateTexture(TextureDescription.Texture2D(
width, height, mipLevels, arrayLayers,
format, TextureUsage.Staging));
// Copy texture data into staging buffer
for (uint level = 0; level < mipLevels; level++)
{
KtxMipmapLevel mipmap = ktxTex2D.Mipmaps[level];
for (uint layer = 0; layer < arrayLayers; layer++)
{
KtxArrayElement ktxLayer = mipmap.ArrayElements[layer];
Debug.Assert(ktxLayer.Faces.Length == 1);
byte[] pixelData = ktxLayer.Faces[0].Data;
fixed(byte *pixelDataPtr = &pixelData[0])
{
gd.UpdateTexture(stagingTex, (IntPtr)pixelDataPtr, (uint)pixelData.Length,
0, 0, 0, mipmap.Width, mipmap.Height, 1, level, layer);
}
}
}
CommandList copyCL = factory.CreateCommandList();
copyCL.Begin();
for (uint level = 0; level < mipLevels; level++)
{
KtxMipmapLevel mipLevel = ktxTex2D.Mipmaps[level];
for (uint layer = 0; layer < arrayLayers; layer++)
{
copyCL.CopyTexture(
stagingTex, 0, 0, 0, level, layer,
ret, 0, 0, 0, level, layer,
mipLevel.Width, mipLevel.Height, mipLevel.Depth,
1);
}
}
copyCL.End();
gd.SubmitCommands(copyCL);
gd.DisposeWhenIdle(copyCL);
gd.DisposeWhenIdle(stagingTex);
return(ret);
}
