public void StoreImageToDDS(Stream stream, PixelFormat format = PixelFormat.Unknown)
{
stream.WriteUInt32(DDS_TAG);
stream.WriteInt32(DDS_HEADER_dwSize);
stream.WriteUInt32(DDSD_CAPS | DDSD_HEIGHT | DDSD_WIDTH | DDSD_MIPMAPCOUNT | DDSD_PIXELFORMAT | DDSD_LINEARSIZE);
stream.WriteInt32(mipMaps[0].height);
stream.WriteInt32(mipMaps[0].width);
int dataSize = 0;
for (int i = 0; i < mipMaps.Count; i++)
{
dataSize += MipMap.getBufferSize(mipMaps[i].width, mipMaps[i].height, format == PixelFormat.Unknown ? pixelFormat : format);
}
stream.WriteInt32(dataSize);
stream.WriteUInt32(0); // dwDepth
stream.WriteInt32(mipMaps.Count);
stream.WriteZeros(44); // dwReserved1
stream.WriteInt32(DDS_PIXELFORMAT_dwSize);
DDS_PF pixfmt = getDDSPixelFormat(format == PixelFormat.Unknown ? pixelFormat : format);
stream.WriteUInt32(pixfmt.flags);
stream.WriteUInt32(pixfmt.fourCC);
stream.WriteUInt32(pixfmt.bits);
stream.WriteUInt32(pixfmt.Rmask);
stream.WriteUInt32(pixfmt.Gmask);
stream.WriteUInt32(pixfmt.Bmask);
stream.WriteUInt32(pixfmt.Amask);
stream.WriteInt32(DDSCAPS_COMPLEX | DDSCAPS_MIPMAP | DDSCAPS_TEXTURE);
stream.WriteUInt32(0); // dwCaps2
stream.WriteUInt32(0); // dwCaps3
stream.WriteUInt32(0); // dwCaps4
stream.WriteUInt32(0); // dwReserved2
for (int i = 0; i < mipMaps.Count; i++)
{
stream.WriteFromBuffer(mipMaps[i].data);
}
}
static public byte[] StoreMipToDDS(byte[] src, PixelFormat format, int w, int h)
{
MemoryStream stream = new MemoryStream();
stream.WriteUInt32(DDS_TAG);
stream.WriteInt32(DDS_HEADER_dwSize);
stream.WriteUInt32(DDSD_CAPS | DDSD_HEIGHT | DDSD_WIDTH | DDSD_MIPMAPCOUNT | DDSD_PIXELFORMAT | DDSD_LINEARSIZE);
stream.WriteInt32(h);
stream.WriteInt32(w);
stream.WriteInt32(src.Length);
stream.WriteUInt32(0); // dwDepth
stream.WriteInt32(1);
stream.WriteZeros(44); // dwReserved1
stream.WriteInt32(DDS_PIXELFORMAT_dwSize);
DDS_PF pixfmt = getDDSPixelFormat(format);
stream.WriteUInt32(pixfmt.flags);
stream.WriteUInt32(pixfmt.fourCC);
stream.WriteUInt32(pixfmt.bits);
stream.WriteUInt32(pixfmt.Rmask);
stream.WriteUInt32(pixfmt.Gmask);
stream.WriteUInt32(pixfmt.Bmask);
stream.WriteUInt32(pixfmt.Amask);
stream.WriteInt32(DDSCAPS_COMPLEX | DDSCAPS_MIPMAP | DDSCAPS_TEXTURE);
stream.WriteUInt32(0); // dwCaps2
stream.WriteUInt32(0); // dwCaps3
stream.WriteUInt32(0); // dwCaps4
stream.WriteUInt32(0); // dwReserved2
stream.WriteFromBuffer(src);
return(stream.ToArray());
}
static private DDS_PF getDDSPixelFormat(PixelFormat format)
{
DDS_PF pixelFormat = new DDS_PF();
switch (format)
{
case PixelFormat.DXT1:
pixelFormat.flags = DDPF_FOURCC;
pixelFormat.fourCC = FOURCC_DXT1_TAG;
break;
case PixelFormat.DXT3:
pixelFormat.flags = DDPF_FOURCC | DDPF_ALPHAPIXELS;
pixelFormat.fourCC = FOURCC_DXT3_TAG;
break;
case PixelFormat.DXT5:
pixelFormat.flags = DDPF_FOURCC | DDPF_ALPHAPIXELS;
pixelFormat.fourCC = FOURCC_DXT5_TAG;
break;
case PixelFormat.ATI2:
pixelFormat.flags = DDPF_FOURCC;
pixelFormat.fourCC = FOURCC_ATI2_TAG;
break;
case PixelFormat.ARGB:
pixelFormat.flags = DDPF_ALPHAPIXELS | DDPF_RGB;
pixelFormat.bits = 32;
pixelFormat.Rmask = 0xFF0000;
pixelFormat.Gmask = 0xFF00;
pixelFormat.Bmask = 0xFF;
pixelFormat.Amask = 0xFF000000;
break;
case PixelFormat.RGB:
pixelFormat.flags = DDPF_RGB;
pixelFormat.bits = 24;
pixelFormat.Rmask = 0xFF0000;
pixelFormat.Gmask = 0xFF00;
pixelFormat.Bmask = 0xFF;
break;
case PixelFormat.V8U8:
pixelFormat.flags = DDPF_SIGNED;
pixelFormat.bits = 16;
pixelFormat.Rmask = 0xFF;
pixelFormat.Gmask = 0xFF00;
break;
case PixelFormat.G8:
pixelFormat.flags = DDPF_LUMINANCE;
pixelFormat.bits = 8;
pixelFormat.Rmask = 0xFF;
break;
default:
throw new Exception("invalid texture format " + pixelFormat);
}
return(pixelFormat);
}
