public static int GetMipmapCount(int width, int height, UnityCompatibleFormat format, int dataLengthPerImage)
{
int divSize = format == UnityCompatibleFormat.DXT1 || format == UnityCompatibleFormat.DXT5 ? 4 : 1;
int blockBytes = format == UnityCompatibleFormat.DXT1 ? 8
: format == UnityCompatibleFormat.DXT5 ? 16
: format == UnityCompatibleFormat.RGBA32 || format == UnityCompatibleFormat.ARGB32 ? 4 : 3;
int mipmaps = 0;
int len = 0;
for (int size; len < dataLengthPerImage; len += size)
{
int blockWidth = Math.Max(divSize, (width + divSize - 1)) / divSize;
int blockHeight = Math.Max(divSize, (height + divSize - 1)) / divSize;
int blocks = blockWidth * blockHeight;
size = blocks * blockBytes;
if (width > 1)
{
width >>= 1;
}
if (height > 1)
{
height >>= 1;
}
mipmaps++;
}
if (len != dataLengthPerImage)
{
mipmaps--;
Report.ReportLog("Warning! Texture is incomplete - mipmaps capped to " + mipmaps);
}
return(mipmaps);
}
public static byte[] CreateHeader(int width, int height, int rgbBitCount, int mipMaps, bool cubemap, UnityCompatibleFormat format)
{
uint fourCC = format == UnityCompatibleFormat.DXT1
? FOURCC_DXT1
: format == UnityCompatibleFormat.DXT5
? FOURCC_DXT5
: /*format == UnityCompatibleFormat.RGBAFloat || format == UnityCompatibleFormat.RGBAHalf ||*/ format == UnityCompatibleFormat.BC7
? FOURCC_DX10
: format == UnityCompatibleFormat.RGBAFloat
? (uint)SlimDX.Direct3D9.Format.A32B32G32R32F
: format == UnityCompatibleFormat.RGBAHalf
? (uint)SlimDX.Direct3D9.Format.A16B16G16R16F
: 0;
uint[] header = new uint[32 + (/*format == UnityCompatibleFormat.RGBAFloat || format == UnityCompatibleFormat.RGBAHalf ||*/ format == UnityCompatibleFormat.BC7 ? 5 : 0)];
header[0] = (byte)'D' | ((byte)'D' << 8) | ((byte)'S' << 16) | ((byte)' ' << 24);
header[1] = 124; // sizeof DDS_HEADER
header[2] = (uint)
(
DDS_HEADER_FLAGS.DDSD_CAPS |
DDS_HEADER_FLAGS.DDSD_HEIGHT |
DDS_HEADER_FLAGS.DDSD_WIDTH |
DDS_HEADER_FLAGS.DDSD_PIXELFORMAT |
(format == UnityCompatibleFormat.DXT1 || format == UnityCompatibleFormat.DXT5 || format == UnityCompatibleFormat.BC7 ? DDS_HEADER_FLAGS.DDSD_LINEARSIZE : 0) |
(mipMaps > 0 ? DDS_HEADER_FLAGS.DDSD_MIPMAPCOUNT : 0)
);
header[3] = (uint)height;
header[4] = (uint)width;
header[5] = (header[2] & (uint)DDS_HEADER_FLAGS.DDSD_LINEARSIZE) != 0 ? (uint)(Math.Max(1, ((width + 3) / 4)) * (format == UnityCompatibleFormat.DXT1 ? 2 : 4) /*block_size*/ * height) : 0;
header[7] = mipMaps > 0 ? (uint)mipMaps : 0;
header[19] = 32; // sizeof DDS_PIXELFORMAT
header[20] = (uint)
(
format == UnityCompatibleFormat.DXT1 || format == UnityCompatibleFormat.DXT5 ||
format == UnityCompatibleFormat.RGBAFloat || format == UnityCompatibleFormat.RGBAHalf ||
format == UnityCompatibleFormat.BC7
? DDS_PIXEL_FORMAT.DDPF_FOURCC
: format == UnityCompatibleFormat.Alpha8
? DDS_PIXEL_FORMAT.DDPF_ALPHA
: DDS_PIXEL_FORMAT.DDPF_RGB |
(
format == UnityCompatibleFormat.RGBA32 || format == UnityCompatibleFormat.ARGB32
? DDS_PIXEL_FORMAT.DDPF_ALPHAPIXELS : 0
)
);
header[21] = fourCC;
header[22] = (uint)rgbBitCount;
if ((header[20] & (uint)DDS_PIXEL_FORMAT.DDPF_RGB) != 0)
{
if (format != UnityCompatibleFormat.Alpha8)
{
header[23] = 0x00ff0000;
header[24] = 0x0000ff00;
header[25] = 0x000000ff;
header[26] = rgbBitCount >= 32 ? 0xff000000 : 0;
}
else
{
header[26] = 0xff;
}
}
header[27] = (uint)(DDS_CAPS.DDSCAPS_TEXTURE | (mipMaps > 0 ? DDS_CAPS.DDSCAPS_COMPLEX | DDS_CAPS.DDSCAPS_MIPMAP : 0));
if (cubemap)
{
header[28] = (uint)(DDS_CAPS2.DDSCAPS2_CUBEMAP | DDS_CAPS2.DDS_CUBEMAP_ALLFACES);
}
if (/*format == UnityCompatibleFormat.RGBAFloat || format == UnityCompatibleFormat.RGBAHalf
|| */format == UnityCompatibleFormat.BC7)
{
header[32] = //format == UnityCompatibleFormat.RGBAFloat ? (uint)SlimDX.Direct3D9.Format.A32B32G32R32F : (uint)SlimDX.Direct3D9.Format.A16B16G16R16F;
(uint)SlimDX.DXGI.Format.BC7_UNorm;
header[33] = (uint)ResourceDimension.Texture2D;
header[35] = 1;
}
return(ConvertToByteArray(header));
}
public static byte[] CreateHeader(int width, int height, byte pixelDepth, UnityCompatibleFormat format)
{
int row_size = (pixelDepth * width + 31) / 32 * 4;
byte[] bmp_header = new byte[0x0e + 40 + (pixelDepth == 16 || pixelDepth == 32 ? 16 : 0)];
using (BinaryWriter writer = new BinaryWriter(new MemoryStream(bmp_header)))
{
writer.Write((byte)'B');
writer.Write((byte)'M');
writer.Write((uint)((row_size * height) + bmp_header.Length));
writer.BaseStream.Position = 0xA;
writer.Write((uint)bmp_header.Length);
writer.Write((uint)(bmp_header.Length - 0x0e));
writer.Write(width);
writer.Write(height);
writer.Write((ushort)1);
writer.Write((ushort)pixelDepth);
if (bmp_header.Length > 0x0e + 40)
{
writer.Write((uint)3); // compression: BI_BITFIELDS
writer.Write((uint)(row_size * height));
writer.BaseStream.Position = 0x36;
if (format == UnityCompatibleFormat.ARGB32)
{
writer.Write((uint)0xFF000000);
writer.Write((uint)0x00FF0000);
writer.Write((uint)0x0000FF00);
writer.Write((uint)0x000000FF);
}
else if (format == UnityCompatibleFormat.RGBA32)
{
writer.Write((uint)0x000000FF);
writer.Write((uint)0x0000FF00);
writer.Write((uint)0x00FF0000);
writer.Write((uint)0xFF000000);
}
}
}
return(bmp_header);
}
