public static KtxFile Load(File file, bool readKeyValuePairs)
{
KtxHeader header = ReadStruct <KtxHeader>(file);
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(file, out int read);
keyValuePairBytesRead += read;
keyValuePairs.Add(kvp);
}
kvps = keyValuePairs.ToArray();
}
else
{
file.Skip((int)header.BytesOfKeyValueData); // 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);
List <uint> imageSizes = new List <uint>();
MipmapLevel[] images = new MipmapLevel[numberOfMipmapLevels];
long dataSize = file.Length - file.Position;
uint totalSize = 0;
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 = file.Read <uint>();
if (mip == 11)
{
//bug?
imageSize = Math.Min(imageSizes.Back() >> 2, imageSize);
//imageSize = 1;
}
imageSizes.Add(imageSize);
ArrayElement[] arrayElements = new ArrayElement[numberOfArrayElements];
bool isCubemap = header.NumberOfFaces == 6 && header.NumberOfArrayElements == 0;
uint arrayElementSize = imageSize / numberOfArrayElements;
for (int arr = 0; arr < numberOfArrayElements; arr++)
{
uint faceSize = arrayElementSize;
ImageFace[] faces = new ImageFace[numberOfFaces];
for (int face = 0; face < numberOfFaces; face++)
{
faces[face] = new ImageFace(file.ReadBytes((int)faceSize));
uint cubePadding = 0u;
if (isCubemap)
{
cubePadding = 3 - ((imageSize + 3) % 4);
}
file.Skip((int)cubePadding);
totalSize += faceSize;
}
arrayElements[arr] = new ArrayElement(faces);
}
images[mip] = new MipmapLevel(
mipWidth,
mipHeight,
mipDepth,
imageSize,
arrayElements, header.NumberOfArrayElements);
uint mipPaddingBytes = 3 - ((imageSize + 3) % 4);
//Debug.Assert(mipPaddingBytes == 0);
file.Skip((int)mipPaddingBytes);
}
//Debug.Assert(dataSize == numberOfMipmapLevels * 4 + totalSize);
return(new KtxFile(header, kvps, images));
}
public KtxFile(KtxHeader header, KtxKeyValuePair[] keyValuePairs, MipmapLevel[] mipmaps)
{
Header = header;
KeyValuePairs = keyValuePairs;
Mipmaps = mipmaps;
}