Commits on Sep 18, 2018

1. Fix an issue on some nvidia cards with texelFetch. …

   In the do_clip() function, texelFetch is sometimes returning
   invalid results on some nVidia GPUs.
   
   To work around that, use UVs as normalized float coordinates
   and fetch via texture(). This fixes the problems on nVidia
   cards.
   
   This exposed a bug in how we handle vertex snapping with clips.
   Previously, we just cast the float UVs to an int before passing
   to texelFetch. Now, pass in the snap offset and apply that to
   the UVs for the clip mask.

   

   gw3583 committed Sep 18, 2018

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