anchor.diff:                     (rtg-math.base-vectors:v2! (- fxaa-span-max)
                                                 (- fxaa-span-max))
                      (* dir rcp-dir-min)))
  -             (rtg-math.vectors:s~ rcp-frame :xy)))
  +             (rtg-math.vectors:s~ one-over-resolution :xy)))
         (let* ((rgb-a
                 (* (/ 1.0 2.0)
                    (+
  
positive.code:            (texture-lod tex
                          (+ (rtg-math.vectors:s~ uv :zw)
                             (* (rtg-math.base-vectors:v2! 1 1)
                                (rtg-math.vectors:s~ rcp-frame :xy)))
                          0.0)
             :xyz))
           (rgb-m
  
negative.code: (in-package #:nineveh.anti-aliasing)
  
  (defun-g fxaa2 ((uv :vec4) (tex :sampler-2d) (one-over-resolution :vec2))
    (let* ((fxaa-span-max 8.0)
           (fxaa-reduce-mul (/ 1.0 fxaa-span-max))
           (fxaa-reduce-min (/ 1.0 128.0))
  