private static unsafe byte[] DecompressFloat(DDSStruct header, byte[] data, DDSPixelFormat pixelFormat)
{
// allocate bitmap
int bpp = (int)(DDSHelper.PixelFormatToBpp(pixelFormat, header.pixelformat.rgbbitcount));
int bps = (int)(header.width * bpp * DDSHelper.PixelFormatToBpc(pixelFormat));
int sizeofplane = (int)(bps * header.height);
int width = (int)header.width;
int height = (int)header.height;
int depth = (int)header.depth;
byte[] rawData = new byte[depth * sizeofplane + height * bps + width * bpp];
int size = 0;
fixed(byte *bytePtr = data)
{
byte *temp = bytePtr;
fixed(byte *destPtr = rawData)
{
byte *destData = destPtr;
switch (pixelFormat)
{
case DDSPixelFormat.R32F: // Red float, green = blue = max
size = width * height * depth * 3;
for (int i = 0, j = 0; i < size; i += 3, j++)
{
((float *)destData)[i] = ((float *)temp)[j];
((float *)destData)[i + 1] = 1.0f;
((float *)destData)[i + 2] = 1.0f;
}
break;
case DDSPixelFormat.A32B32G32R32F: // Direct copy of float RGBA data
Array.Copy(data, rawData, data.Length);
break;
case DDSPixelFormat.G32R32F: // Red float, green float, blue = max
size = width * height * depth * 3;
for (int i = 0, j = 0; i < size; i += 3, j += 2)
{
((float *)destData)[i] = ((float *)temp)[j];
((float *)destData)[i + 1] = ((float *)temp)[j + 1];
((float *)destData)[i + 2] = 1.0f;
}
break;
case DDSPixelFormat.R16F: // Red float, green = blue = max
size = width * height * depth * bpp;
DDSHelper.ConvR16ToFloat32((uint *)destData, (ushort *)temp, (uint)size);
break;
case DDSPixelFormat.A16B16G16R16F: // Just convert from half to float.
size = width * height * depth * bpp;
DDSHelper.ConvFloat16ToFloat32((uint *)destData, (ushort *)temp, (uint)size);
break;
case DDSPixelFormat.G16R16F: // Convert from half to float, set blue = max.
size = width * height * depth * bpp;
DDSHelper.ConvG16R16ToFloat32((uint *)destData, (ushort *)temp, (uint)size);
break;
default:
break;
}
}
}
return(rawData);
}