private Mipmap GenerateMipmap(Bitmap inputImage, TEXFile.PixelFormat pixelFormat, bool preMultiplyAlpha)
{
byte[] rgba = new byte[inputImage.Width * inputImage.Height * 4];
for (int y = 0; y < inputImage.Height; y++)
{
for (int x = 0; x < inputImage.Width; x++)
{
Color c = inputImage.GetPixel(x, y);
if (preMultiplyAlpha)
{
float alphamod = (float)c.A / 255.0f; // Normalize.
var newR = (byte)(c.R * alphamod);
var newG = (byte)(c.G * alphamod);
var newB = (byte)(c.B * alphamod);
c = Color.FromArgb(c.A, newR, newG, newB);
}
rgba[y * inputImage.Width * 4 + x * 4 + 0] = c.R;
rgba[y * inputImage.Width * 4 + x * 4 + 1] = c.G;
rgba[y * inputImage.Width * 4 + x * 4 + 2] = c.B;
rgba[y * inputImage.Width * 4 + x * 4 + 3] = c.A;
}
}
byte[] finalImageData = null;
switch (pixelFormat)
{
case TEXFile.PixelFormat.DXT1:
finalImageData = Squish.CompressImage(rgba, inputImage.Width, inputImage.Height, SquishFlags.Dxt1);
break;
case TEXFile.PixelFormat.DXT3:
finalImageData = Squish.CompressImage(rgba, inputImage.Width, inputImage.Height, SquishFlags.Dxt3);
break;
case TEXFile.PixelFormat.DXT5:
finalImageData = Squish.CompressImage(rgba, inputImage.Width, inputImage.Height, SquishFlags.Dxt5);
break;
case TEXFile.PixelFormat.ARGB:
finalImageData = rgba;
break;
}
var mipmap = new Mipmap();
mipmap.Width = (ushort)inputImage.Width;
mipmap.Height = (ushort)inputImage.Height;
mipmap.Pitch = 0;
mipmap.ARGBData = finalImageData;
return(mipmap);
}
private Mipmap GenerateMipmap(Bitmap inputImage, TEXFile.PixelFormat pixelFormat, int width, int height, InterpolationMode mode, bool preMultiplyAlpha)
{
Bitmap b = new Bitmap(width, height);
using (Graphics g = Graphics.FromImage((Image)b))
{
g.InterpolationMode = mode;
g.DrawImage(inputImage, 0, 0, width, height);
}
return(GenerateMipmap(b, pixelFormat, preMultiplyAlpha));
}
private void ConvertPNGToTex(string inputFile, FileStream outputStream)
{
TEXFile.PixelFormat PixelFormat = (TEXFile.PixelFormat)Enum.Parse(typeof(TEXFile.PixelFormat), this.pixelFormatComboBox.Text);
InterpolationMode interpolationMode = (InterpolationMode)Enum.Parse(typeof(InterpolationMode), this.mipmapFilterComboBox.Text);
Bitmap inputImage = (Bitmap)Bitmap.FromFile(inputFile);
inputImage.RotateFlip(RotateFlipType.RotateNoneFlipY);
bool GenerateMipmaps = generateMipmapsCheckBox.Checked;
List <Mipmap> Mipmaps = new List <Mipmap>();
bool preMultiplyAlpha = preMultiplyAlphaCheckBox.Checked;
Mipmaps.Add(GenerateMipmap(inputImage, PixelFormat, preMultiplyAlpha));
if (GenerateMipmaps)
{
var width = inputImage.Width;
var height = inputImage.Height;
while (Math.Max(width, height) > 1)
{
width = Math.Max(1, width >> 1);
height = Math.Max(1, height >> 1);
Mipmaps.Add(GenerateMipmap(inputImage, PixelFormat, width, height, interpolationMode, preMultiplyAlpha));
}
}
TEXFile outputTEXFile = new TEXFile();
outputTEXFile.File.Header.Platform = 0;
outputTEXFile.File.Header.PixelFormat = (uint)PixelFormat;
outputTEXFile.File.Header.TextureType = (uint)EnumHelper <TEXFile.TextureType> .GetValueFromDescription(this.textureTypeComboBox.Text);
outputTEXFile.File.Header.NumMips = (uint)Mipmaps.Count;
outputTEXFile.File.Header.Flags = 0;
MemoryStream ms = new MemoryStream();
BinaryWriter writer = new BinaryWriter(ms);
foreach (Mipmap mip in Mipmaps)
{
writer.Write(mip.Width);
writer.Write(mip.Height);
writer.Write(mip.Pitch);
writer.Write((uint)mip.ARGBData.Length);
}
foreach (Mipmap mip in Mipmaps)
{
writer.Write(mip.ARGBData);
}
writer.Close();
outputTEXFile.File.Raw = ms.ToArray();
outputTEXFile.SaveFile(outputStream);
}
