/// <summary>
/// Constructor for texture data
/// </summary>
/// <param name="textureDatas">List of 2d texture bytes, one for each mipmap level</param>
public KtxTextureData(List <byte[]> textureDatas)
{
if (textureDatas == null || textureDatas.Count < 1)
{
throw new ArgumentException("Texturedatas must contain something");
}
this.textureDataOfMipmapLevel = textureDatas;
this.textureType = this.textureDataOfMipmapLevel.Count > 1 ? TextureTypeBasic.Basic2DWithMipmaps : TextureTypeBasic.Basic2DNoMipmaps;
}
/// <summary>
/// Constructor for texture data
/// </summary>
/// <param name="header">Header</param>
/// <param name="stream">Stream for reading</param>
public KtxTextureData(KtxHeader header, Stream stream)
{
//this.totalTextureDataLength = (uint)stream.Length;
// Try to figure out texture type basic
bool containsMipmaps = header.numberOfMipmapLevels > 1;
if (header.numberOfArrayElements == 0 || header.numberOfArrayElements == 1)
{
// Is NOT texture array
if (header.numberOfFaces == 0 || header.numberOfFaces == 1)
{
// Is NOT cube texture
if (header.pixelDepth == 0 || header.pixelDepth == 1)
{
// Is not 3D texture
if (header.pixelHeight == 0 || header.pixelHeight == 1)
{
// 1D texture
this.textureType = containsMipmaps ? TextureTypeBasic.Basic1DWithMipmaps : TextureTypeBasic.Basic1DNoMipmaps;
}
else
{
// 2D texture
this.textureType = containsMipmaps ? TextureTypeBasic.Basic2DWithMipmaps : TextureTypeBasic.Basic2DNoMipmaps;
}
}
else
{
// Is 3D texture
this.textureType = containsMipmaps ? TextureTypeBasic.Basic3DWithMipmaps : TextureTypeBasic.Basic3DNoMipmaps;
}
}
else
{
// Is cube texture
}
}
else
{
// Is Texture array
}
uint mipmapLevels = header.numberOfMipmapLevels;
if (mipmapLevels == 0)
{
mipmapLevels = 1;
}
// Since we know how many mipmap levels there are, allocate the capacity
this.textureDataOfMipmapLevel = new List <byte[]>((int)mipmapLevels);
// Check if length reads should be endian swapped
bool shouldSwapEndianness = (header.endiannessValue != Common.expectedEndianValue);
using (BinaryReader reader = new BinaryReader(stream, Encoding.UTF8, leaveOpen: true))
{
for (int i = 0; i < mipmapLevels; i++)
{
uint amountOfDataInThisMipmapLevel = shouldSwapEndianness ? KtxBitFiddling.SwapEndian(reader.ReadUInt32()) : reader.ReadUInt32();
this.textureDataOfMipmapLevel.Add(reader.ReadBytes((int)amountOfDataInThisMipmapLevel));
// Skip possible padding bytes
while (amountOfDataInThisMipmapLevel % 4 != 0)
{
amountOfDataInThisMipmapLevel++;
// Read but ignore values
reader.ReadByte();
}
}
}
}
