/// <summary>
/// Convienence method for setting the AiString string (and length).
/// </summary>
/// <param name="data">String data to set</param>
/// <returns>True if the operation was successful, false otherwise.</returns>
public unsafe bool SetString(String data)
{
if (String.IsNullOrEmpty(data))
{
Length = new UIntPtr(0);
fixed(byte *bytePtr = Data)
MemoryHelper.ClearMemory(new IntPtr(bytePtr), 0, AiDefines.MAX_LENGTH);
return(true);
}
//Note: aiTypes.h specifies aiString is UTF-8 encoded string.
if (Encoding.UTF8.GetByteCount(data) <= AiDefines.MAX_LENGTH)
{
byte[] copy = Encoding.UTF8.GetBytes(data);
//Write bytes to data field
if (copy.Length > 0)
{
fixed(byte *bytePtr = Data)
MemoryHelper.Write <byte>(new IntPtr(bytePtr), copy, 0, copy.Length);
}
Length = new UIntPtr((uint)copy.Length);
return(true);
}
return(false);
}
/// <summary>
/// Writes DDS formatted data to a stream. Image data is expected to be DXGI-compliant data, but an effort is made to write out D3D9-compatible headers when possible.
/// </summary>
/// <param name="output">Output stream.</param>
/// <param name="mipChains">Mipmap chains to write. Each mipmap chain represents a single face (so > 1 represents an array texture or a Cubemap). All faces must have
/// equivalent dimensions and each chain must have the same number of mipmaps.</param>
/// <param name="format">DXGI format the image data is stored as.</param>
/// <param name="texDim">Dimension of the texture to write.</param>
/// <param name="flags">Flags to control how the DDS data is saved.</param>
/// <returns>True if writing the data was successful, false if otherwise.</returns>
public static bool Write(Stream output, List <MipChain> mipChains, DXGIFormat format, TextureDimension texDim, DDSFlags flags = DDSFlags.None)
{
if (output == null || !output.CanWrite || mipChains == null || mipChains.Count == 0 || mipChains[0].Count == 0 || format == DXGIFormat.Unknown)
{
return(false);
}
//Extract details
int width, height, depth, arrayCount, mipCount;
MipData firstMip = mipChains[0][0];
width = firstMip.Width;
height = firstMip.Height;
depth = firstMip.Depth;
arrayCount = mipChains.Count;
mipCount = mipChains[0].Count;
if (!ValidateInternal(mipChains, format, texDim))
{
return(false);
}
//Setup a transfer buffer
StreamTransferBuffer buffer = new StreamTransferBuffer(firstMip.RowPitch, false);
//Write out header
if (!WriteHeader(output, buffer, texDim, format, width, height, depth, arrayCount, mipCount, flags))
{
return(false);
}
//Iterate over each array face...
for (int i = 0; i < arrayCount; i++)
{
MipChain mipChain = mipChains[i];
//Iterate over each mip face...
for (int mipLevel = 0; mipLevel < mipCount; mipLevel++)
{
MipData mip = mipChain[mipLevel];
//Compute pitch, based on MSDN programming guide. We will write out these pitches rather than the supplied in order to conform to the recomendation
//that we compute pitch based on format
int realMipWidth, realMipHeight, dstRowPitch, dstSlicePitch, bytesPerPixel;
ImageHelper.ComputePitch(format, mip.Width, mip.Height, out dstRowPitch, out dstSlicePitch, out realMipWidth, out realMipHeight, out bytesPerPixel);
//Ensure write buffer is sufficiently sized for a single scanline
if (buffer.Length < dstRowPitch)
{
buffer.Resize(dstRowPitch, false);
}
//Sanity check
if (dstRowPitch < mip.RowPitch)
{
return(false);
}
IntPtr srcPtr = mip.Data;
//Advance stream one slice at a time...
for (int slice = 0; slice < mip.Depth; slice++)
{
int bytesToWrite = dstSlicePitch;
IntPtr sPtr = srcPtr;
//Copy scanline into temp buffer, write to output
for (int row = 0; row < realMipHeight; row++)
{
MemoryHelper.CopyMemory(buffer.Pointer, sPtr, dstRowPitch);
buffer.WriteBytes(output, dstRowPitch);
bytesToWrite -= dstRowPitch;
//Advance to next scanline in source data
sPtr = MemoryHelper.AddIntPtr(sPtr, mip.RowPitch);
}
//Pad slice if necessary
if (bytesToWrite > 0)
{
MemoryHelper.ClearMemory(buffer.Pointer, 0, bytesToWrite);
buffer.WriteBytes(output, bytesToWrite);
}
//Advance source pointer to next slice
srcPtr = MemoryHelper.AddIntPtr(srcPtr, mip.SlicePitch);
}
}
}
return(true);
}
