static void WriteTexture(string fileName, EXRData data)
{
string err = "";
IntPtr ptr = Marshal.AllocHGlobal(sizeof(float) * data.pixels.Length);
Marshal.Copy(data.pixels, 0, ptr, data.pixels.Length);
if (TinyExr.TinyExr.SaveEXR(ptr, data.width, data.height, 4, 0, fileName, ref err) != 0)
{
throw new Exception(err);
}
Marshal.FreeHGlobal(ptr);
}
string CombineExr(LightmapHolder holder, LightmapData[] data)
{
var textures = data.Select(d => ReadTexture(AssetDatabase.GetAssetPath(d.lightmapColor), d.lightmapColor.width, d.lightmapColor.height)).ToArray();
if (textures.Length == 0)
{
return("");
}
EXRData combine = new EXRData()
{
width = MAX_SIZE * 2, height = MAX_SIZE * 2, pixels = new float[MAX_SIZE * MAX_SIZE * 4 * 4]
};
for (int i = 0; i < combine.pixels.Length; ++i)
{
combine.pixels[i] = 1;
}
holder.scales = new float[textures.Length];
for (int i = 0; i < textures.Length; ++i)
{
var texture = textures[i];
if (texture == null)
{
continue;
}
var raw = textures[i].pixels;
var offsety = combine.height / 2 - texture.height;
holder.scales[i] = (float)texture.height / (float)combine.height;
for (int x = 0; x < texture.width; ++x)
{
for (int y = 0; y < texture.height; ++y)
{
var index = (x + y * texture.width) * 4;
var destX = (i % 2) * (combine.width / 2) + x;
var destY = (1 - i / 2) * (combine.height / 2) + y + offsety;
var dest = (destX + destY * combine.width) * 4;
combine.pixels[dest] = raw[index];
combine.pixels[dest + 1] = raw[index + 1];
combine.pixels[dest + 2] = raw[index + 2];
combine.pixels[dest + 3] = raw[index + 3];
}
}
}
var fileName = AssetDatabase.GetAssetPath(data[0].lightmapColor);
fileName = Path.Combine(Path.GetDirectoryName(fileName), Path.GetFileNameWithoutExtension(fileName)) + "_combined" + Path.GetExtension(fileName);
WriteTexture(fileName, combine);
return(fileName);
}
static EXRData ReadTexture(string fileName, int width, int height)
{
EXRData ret = new EXRData();
ret.pixels = new float[width * height * 4];
string err = "";
IntPtr ptr = IntPtr.Zero;
if (TinyExr.TinyExr.LoadEXR(ref ptr, ref ret.width, ref ret.height, fileName, ref err) != 0)
{
throw new Exception(err);
}
Marshal.Copy(ptr, ret.pixels, 0, ret.pixels.Length);
Marshal.FreeHGlobal(ptr);
return(ret);
}
