- only triangular noise needs to be scaled between +/-1, other noises
have a uniform distribution and need to be scaled between +/-0.5
- all dither routines work in RGBA
- fixed FXAA in opaque mode when dithering modified the alpha channel
(which is used by FXAA). This fixes flickering when FXAA and dithering
was enabled.
- use triangular noise dithering on mobile and desktop. The cost in
not measurable on a pixel 4 / 1080p, and the quality is better.
- refactor dithering code a bit such that:
- noise methods are not temporal
- all dither functions have the same structure
e31ebb7a82