Pixelflinger 583c1c07cf SSCT optimizations and fixes ...

- Use lower depth LOD as the cone radius increases.
  This is the same technique we use for SAO.
  The better cache access significantly improve performance.
  On a test on Pixel4 at 585MHz, SAO pass improves by 30%.
  This also helps the algorithm scale with the shadow distance.

- Shadow direction/length no longer dependent on aspect-ratio and camera
  orientation.
  This is fixed by doing all the computations in screen-space instead of 
  normalized screen space.

- Shadow parameters are no longer dependent on the field of view.

- Also rename dominantLightShadowing.fs to ssct.fs

- remove zoom parameter, it wasn't very useful.

2020-09-29 17:00:32 -07:00

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