tree 9fa42d02f3c0d2c3a70f0ee4b4690ec5d52ac662
parent 1f5294f9d1540aeaf2d8937d4ea2839c923c6c4b
author John Stiles <johnstiles@google.com> 1679076696 -0400
committer SkCQ <skcq-be@skia-corp.google.com.iam.gserviceaccount.com> 1679084654 +0000

Implement faceforward intrinsic in RP codegen.

This implementation uses bitwise logic to toggle the sign bit of N
based on the result of dot(I, NRef).

Change-Id: I1e788435d5943ea6e01a04da89289ee3a3f1fa74
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/658076
Reviewed-by: Brian Osman <brianosman@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
Commit-Queue: John Stiles <johnstiles@google.com>