public static void CreateAndSaveSeparateTextures(TextureTool texTool, TexImage texImage, string originalTextureURL, bool shouldGenerateMipMaps, PixelFormat outputFormat = PixelFormat.ETC1)
{
var assetManager = new AssetManager();
var alphaTextureURL = GenerateAlphaTextureURL(originalTextureURL);
var colorTextureURL = GenerateColorTextureURL(originalTextureURL);
// create a new image containing only the alpha component
texTool.Decompress(texImage, texImage.Format.IsSRgb());
using (var alphaImage = texTool.CreateImageFromAlphaComponent(texImage))
{
// generate the mip-maps for the alpha component if required
if (shouldGenerateMipMaps)
texTool.GenerateMipMaps(alphaImage, Filter.MipMapGeneration.Box);
// save the alpha component
texTool.Compress(alphaImage, outputFormat);
using (var outputImage = texTool.ConvertToXenkoImage(alphaImage))
assetManager.Save(alphaTextureURL, outputImage.ToSerializableVersion());
}
// save the color component
texTool.Decompress(texImage, texImage.Format.IsSRgb());
texTool.Compress(texImage, outputFormat);
using (var outputImage = texTool.ConvertToXenkoImage(texImage))
assetManager.Save(colorTextureURL, outputImage.ToSerializableVersion());
}