private static bool WriteHeader(Stream output, StreamTransferBuffer buffer, TextureDimension texDim, DXGIFormat format, int width, int height, int depth, int arrayCount, int mipCount, DDSFlags flags)
{
//Force the DX10 header...
bool writeDX10Header = (flags & DDSFlags.ForceExtendedHeader) == DDSFlags.ForceExtendedHeader;
//Or do DX10 if the following is true...1D textures or 2D texture arrays that aren't cubemaps...
if (!writeDX10Header)
{
switch (texDim)
{
case TextureDimension.One:
writeDX10Header = true;
break;
case TextureDimension.Two:
writeDX10Header = arrayCount > 1;
break;
}
}
//Figure out pixel format, if not writing DX10 header...
PixelFormat pixelFormat;
if (!writeDX10Header)
{
switch (format)
{
case DXGIFormat.R8G8B8A8_UNorm:
pixelFormat = PixelFormat.A8B8G8R8;
break;
case DXGIFormat.R16G16_UNorm:
pixelFormat = PixelFormat.G16R16;
break;
case DXGIFormat.R8G8_UNorm:
pixelFormat = PixelFormat.A8L8;
break;
case DXGIFormat.R16_UNorm:
pixelFormat = PixelFormat.L16;
break;
case DXGIFormat.R8_UNorm:
pixelFormat = PixelFormat.L8;
break;
case DXGIFormat.A8_UNorm:
pixelFormat = PixelFormat.A8;
break;
case DXGIFormat.R8G8_B8G8_UNorm:
pixelFormat = PixelFormat.R8G8_B8G8;
break;
case DXGIFormat.G8R8_G8B8_UNorm:
pixelFormat = PixelFormat.G8R8_G8B8;
break;
case DXGIFormat.BC1_UNorm:
pixelFormat = PixelFormat.DXT1;
break;
case DXGIFormat.BC2_UNorm:
pixelFormat = PixelFormat.DXT3;
break;
case DXGIFormat.BC3_UNorm:
pixelFormat = PixelFormat.DXT5;
break;
case DXGIFormat.BC4_UNorm:
pixelFormat = PixelFormat.BC4_UNorm;
break;
case DXGIFormat.BC4_SNorm:
pixelFormat = PixelFormat.BC4_SNorm;
break;
case DXGIFormat.BC5_UNorm:
pixelFormat = PixelFormat.BC5_UNorm;
break;
case DXGIFormat.BC5_SNorm:
pixelFormat = PixelFormat.BC5_SNorm;
break;
case DXGIFormat.B5G6R5_UNorm:
pixelFormat = PixelFormat.R5G6B5;
break;
case DXGIFormat.B5G5R5A1_UNorm:
pixelFormat = PixelFormat.A1R5G5B5;
break;
case DXGIFormat.B8G8R8A8_UNorm:
pixelFormat = PixelFormat.A8R8G8B8;
break;
case DXGIFormat.B8G8R8X8_UNorm:
pixelFormat = PixelFormat.X8R8G8B8;
break;
case DXGIFormat.B4G4R4A4_UNorm:
pixelFormat = PixelFormat.A4R4G4B4;
break;
case DXGIFormat.R32G32B32A32_Float:
pixelFormat = PixelFormat.R32G32B32A32_Float;
break;
case DXGIFormat.R16G16B16A16_Float:
pixelFormat = PixelFormat.R16G16B16A16_Float;
break;
case DXGIFormat.R16G16B16A16_UNorm:
pixelFormat = PixelFormat.R16G16B16A16_UNorm;
break;
case DXGIFormat.R16G16B16A16_SNorm:
pixelFormat = PixelFormat.R16G16B16A16_SNorm;
break;
case DXGIFormat.R32G32_Float:
pixelFormat = PixelFormat.R32G32_Float;
break;
case DXGIFormat.R16G16_Float:
pixelFormat = PixelFormat.R16G16_Float;
break;
case DXGIFormat.R32_Float:
pixelFormat = PixelFormat.R32_Float;
break;
case DXGIFormat.R16_Float:
pixelFormat = PixelFormat.R16_Float;
break;
default:
pixelFormat = PixelFormat.DX10Extended;
writeDX10Header = true;
break;
}
}
else
{
pixelFormat = PixelFormat.DX10Extended;
}
Header header = new Header();
header.Size = (uint)MemoryHelper.SizeOf <Header>();
header.PixelFormat = pixelFormat;
header.Flags = HeaderFlags.Caps | HeaderFlags.Width | HeaderFlags.Height | HeaderFlags.PixelFormat;
header.Caps = HeaderCaps.Texture;
Header10?header10 = null;
if (mipCount > 0)
{
header.Flags |= HeaderFlags.MipMapCount;
header.MipMapCount = (uint)mipCount;
header.Caps |= HeaderCaps.MipMap;
}
switch (texDim)
{
case TextureDimension.One:
header.Width = (uint)width;
header.Height = 1;
header.Depth = 1;
//Should always be writing out extended header for 1D textures
System.Diagnostics.Debug.Assert(writeDX10Header);
header10 = new Header10(format, D3D10ResourceDimension.Texture1D, Header10Flags.None, (uint)arrayCount, Header10Flags2.None);
break;
case TextureDimension.Two:
header.Width = (uint)width;
header.Height = (uint)height;
header.Depth = 1;
if (writeDX10Header)
{
header10 = new Header10(format, D3D10ResourceDimension.Texture2D, Header10Flags.None, (uint)arrayCount, Header10Flags2.None);
}
break;
case TextureDimension.Cube:
header.Width = (uint)width;
header.Height = (uint)height;
header.Depth = 1;
header.Caps |= HeaderCaps.Complex;
header.Caps2 |= HeaderCaps2.Cubemap_AllFaces;
//can support array tex cubes, so must be multiples of 6
if (arrayCount % 6 != 0)
{
return(false);
}
if (writeDX10Header)
{
header10 = new Header10(format, D3D10ResourceDimension.Texture2D, Header10Flags.TextureCube, (uint)arrayCount / 6, Header10Flags2.None);
}
break;
case TextureDimension.Three:
header.Width = (uint)width;
header.Height = (uint)height;
header.Depth = (uint)depth;
header.Flags |= HeaderFlags.Depth;
header.Caps2 |= HeaderCaps2.Volume;
if (arrayCount != 1)
{
return(false);
}
if (writeDX10Header)
{
header10 = new Header10(format, D3D10ResourceDimension.Texture3D, Header10Flags.None, 1, Header10Flags2.None);
}
break;
}
int realWidth, realHeight, rowPitch, slicePitch;
ImageHelper.ComputePitch(format, width, height, out rowPitch, out slicePitch, out realWidth, out realHeight);
if (FormatConverter.IsCompressed(format))
{
header.Flags |= HeaderFlags.LinearSize;
header.PitchOrLinearSize = (uint)slicePitch;
}
else
{
header.Flags |= HeaderFlags.Pitch;
header.PitchOrLinearSize = (uint)rowPitch;
}
//Write out magic word, DDS header, and optionally extended header
buffer.Write <FourCC>(output, DDS_MAGIC);
buffer.Write <Header>(output, header);
if (header10.HasValue)
{
System.Diagnostics.Debug.Assert(header.PixelFormat.IsDX10Extended);
buffer.Write <Header10>(output, header10.Value);
}
return(true);
}
/// <summary>
/// Reads DDS formatted data from a stream. Image data is always returned as DXGI-Compliant
/// format, therefore some old legacy formats will automatically be converted.
/// </summary>
/// <param name="input">Input stream.</param>
/// <param name="flags">Flags to control how the DDS data is loaded.</param>
/// <returns>Loaded image data, or null if the data failed to load.</returns>
public static DDSContainer Read(Stream input, DDSFlags flags = DDSFlags.None)
{
StreamTransferBuffer buffer = new StreamTransferBuffer();
Header header;
Header10?headerExt;
//Reads + validates header(s)
if (!ReadHeader(input, buffer, out header, out headerExt))
{
return(null);
}
//Gather up metadata
List <MipChain> mipChains = null;
DXGIFormat format = DXGIFormat.Unknown;
TextureDimension texDim = TextureDimension.Two;
ConversionFlags convFlags = ConversionFlags.None;
bool legacyDword = (flags & DDSFlags.LegacyDword) == DDSFlags.LegacyDword ? true : false;
int width = Math.Max((int)header.Width, 1);
int height = Math.Max((int)header.Height, 1);
int depth = Math.Max((int)header.Depth, 1);
int mipCount = (int)header.MipMapCount;
int arrayCount = 1;
//Has extended header, a modern DDS
if (headerExt.HasValue)
{
Header10 extendedHeader = headerExt.Value;
arrayCount = (int)extendedHeader.ArraySize;
format = extendedHeader.Format;
switch (extendedHeader.ResourceDimension)
{
case D3D10ResourceDimension.Texture1D:
{
texDim = TextureDimension.One;
if (height > 1 || depth > 1)
{
return(null);
}
}
break;
case D3D10ResourceDimension.Texture2D:
{
if ((extendedHeader.MiscFlags & Header10Flags.TextureCube) == Header10Flags.TextureCube)
{
//Specifies # of cubemaps, so to get total # of faces must multiple by 6
arrayCount *= 6;
texDim = TextureDimension.Cube;
}
else
{
texDim = TextureDimension.Two;
}
if (depth > 1)
{
return(null);
}
}
break;
case D3D10ResourceDimension.Texture3D:
{
texDim = TextureDimension.Three;
if (arrayCount > 1 || (header.Caps2 & HeaderCaps2.Volume) != HeaderCaps2.Volume)
{
return(null);
}
}
break;
}
}
else
{
//Otherwise, read legacy DDS and possibly convert data
//Check volume flag
if ((header.Caps2 & HeaderCaps2.Volume) == HeaderCaps2.Volume)
{
texDim = TextureDimension.Three;
}
else
{
//legacy DDS could not express 1D textures, so either a cubemap or a 2D non-array texture
if ((header.Caps2 & HeaderCaps2.Cubemap) == HeaderCaps2.Cubemap)
{
//Must have all six faces. DirectX 8 and above always would write out all 6 faces
if ((header.Caps2 & HeaderCaps2.Cubemap_AllFaces) != HeaderCaps2.Cubemap_AllFaces)
{
return(null);
}
arrayCount = 6;
texDim = TextureDimension.Cube;
}
else
{
texDim = TextureDimension.Two;
}
}
format = FormatConverter.DetermineDXGIFormat(header.PixelFormat, flags, out convFlags);
}
//Modify conversion flags, if necessary
FormatConverter.ModifyConversionFormat(ref format, ref convFlags, flags);
//If palette image, the palette will be the first thing
int[] palette = null;
if (FormatConverter.HasConversionFlag(convFlags, ConversionFlags.Pal8))
{
palette = new int[256];
int palSize = palette.Length * sizeof(int);
buffer.ReadBytes(input, palSize);
if (buffer.LastReadByteCount != palSize)
{
return(null);
}
MemoryHelper.CopyBytes <int>(buffer.ByteArray, 0, palette, 0, palette.Length);
}
//Now read data based on available mip/arrays
mipChains = new List <MipChain>(arrayCount);
byte[] scanline = buffer.ByteArray;
IntPtr scanlinePtr = buffer.Pointer;
bool noPadding = (flags & DDSFlags.NoPadding) == DDSFlags.NoPadding ? true : false;
bool isCompressed = FormatConverter.IsCompressed(format);
bool errored = false;
try
{
//Iterate over each array face...
for (int i = 0; i < arrayCount; i++)
{
MipChain mipChain = new MipChain(mipCount);
mipChains.Add(mipChain);
//Iterate over each mip face...
for (int mipLevel = 0; mipLevel < mipCount; mipLevel++)
{
//Calculate mip dimensions
int mipWidth = width;
int mipHeight = height;
int mipDepth = depth;
ImageHelper.CalculateMipmapLevelDimensions(mipLevel, ref mipWidth, ref mipHeight, ref mipDepth);
//Compute pitch, based on MSDN programming guide which says PitchOrLinearSize is unreliable and to calculate based on format.
//"real" mip width/height is the given mip width/height for all non-compressed, compressed images it will be smaller since each block
//is a 4x4 region of pixels.
int realMipWidth, realMipHeight, dstRowPitch, dstSlicePitch, bytesPerPixel;
ImageHelper.ComputePitch(format, mipWidth, mipHeight, out dstRowPitch, out dstSlicePitch, out realMipWidth, out realMipHeight, out bytesPerPixel, legacyDword);
int srcRowPitch = dstRowPitch;
int srcSlicePitch = dstSlicePitch;
//Are we converting from a legacy format, possibly?
if (!headerExt.HasValue)
{
int legacySize = FormatConverter.LegacyFormatBitsPerPixelFromConversionFlag(convFlags);
if (legacySize != 0)
{
srcRowPitch = (realMipWidth * legacySize + 7) / 8;
srcSlicePitch = srcRowPitch * realMipHeight;
}
}
//If output data is requested not to have padding, recompute destination pitches
if (noPadding)
{
dstRowPitch = bytesPerPixel * realMipWidth;
dstSlicePitch = dstRowPitch * realMipHeight;
}
//Setup memory to hold the loaded image
MipData mipSurface = new MipData(mipWidth, mipHeight, mipDepth, dstRowPitch, dstSlicePitch);
mipChain.Add(mipSurface);
//Ensure read buffer is sufficiently sized for a single scanline
if (buffer.Length < srcRowPitch)
{
buffer.Resize(srcRowPitch, false);
}
IntPtr dstPtr = mipSurface.Data;
//Advance stream one slice at a time...
for (int slice = 0; slice < mipDepth; slice++)
{
long slicePos = input.Position;
IntPtr dPtr = dstPtr;
//Copy scanline into temp buffer, do any conversions, copy to output
for (int row = 0; row < realMipHeight; row++)
{
int numBytesRead = input.Read(scanline, 0, srcRowPitch);
if (numBytesRead != srcRowPitch)
{
errored = true;
System.Diagnostics.Debug.Assert(false);
return(null);
}
//Copy scanline, optionally convert data
FormatConverter.CopyScanline(dPtr, dstRowPitch, scanlinePtr, srcRowPitch, format, convFlags, palette);
//Increment dest pointer to next row
dPtr = MemoryHelper.AddIntPtr(dPtr, dstRowPitch);
}
//Advance stream and destination pointer to the next slice
input.Position = slicePos + srcSlicePitch;
dstPtr = MemoryHelper.AddIntPtr(dstPtr, dstSlicePitch);
}
}
}
}
finally
{
//If errored, clean up any mip surfaces we allocated...no null entries should have been made either
if (errored)
{
DisposeMipChains(mipChains);
}
}
if (!ValidateInternal(mipChains, format, texDim))
{
System.Diagnostics.Debug.Assert(false);
return(null);
}
return(new DDSContainer(mipChains, format, texDim));
}