tree 47604a97d34cf1a22297cb1ad7074f33f5384995
parent 9ae6cfd7474303a699af8e98d9449d6a78fd02a8
author Nicolas Capens <capn@google.com> 1511814305 -0500
committer Nicolas Capens <nicolascapens@google.com> 1512142453 +0000

Refactor high-precision texture coordinate addressing.

Uses 0, -1 offsets instead of 0, 1 to be able to use it as a
mask. Optimize calculation of the integer coordinates and fraction by
always having xyz1 = xyz0 + 1 (before wrap). Optimize the
clamping/wrapping of the integer coordinates. Skip addressing operation
of the third component for cube sampling (since already projected to
2D face).

Change-Id: If2e7c74aac9ae923a0c1ffc278fcdfec00f216f3
Reviewed-on: https://swiftshader-review.googlesource.com/14269
Tested-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>