I was able to implement it using the unsharp mask method. The 3x3 blur filter was just a scaled sum of samples near the texture coordinate, so that’s not particularly optimal, but it works at 1280x720 and 1920x1080.
I was able to implement it using the unsharp mask method. The 3x3 blur filter was just a scaled sum of samples near the texture coordinate, so that’s not particularly optimal, but it works at 1280x720 and 1920x1080.