public static byte[] Decompress(
EndianBinaryReader r,
int width,
int height,
GlTextureFormat inputFormat,
long readLength)
{
bool hasAlpha = (inputFormat == GlTextureFormat.ETC1a4);
byte[] pixelData = new byte[readLength * (hasAlpha ? 4 : 8)];
for (int y = 0; y < height; y += 8)
{
for (int x = 0; x < width; x += 8)
{
Etc1.DecodeETC1Tile_(r,
pixelData,
x,
y,
width,
height,
(hasAlpha ? true : false));
}
}
return(pixelData);
}
private GlTextureFormat CollapseFormat_(GlTextureFormat format)
{
var lowerFormat = (GlTextureFormat)((int)format & 0xFFFF);
if (lowerFormat == GlTextureFormat.ETC1)
{
format = GlTextureFormat.ETC1;
}
else if (lowerFormat == GlTextureFormat.ETC1a4)
{
format = GlTextureFormat.ETC1a4;
}
return(format);
}
private int GetFmtBpp_(GlTextureFormat format)
=> this.CollapseFormat_(format) switch
{