tree a952c7dfa7fbb327386d2b3003fdb15dfcb24d29
parent 4453c9add29d9189de0112349c21741415d5ad6f
author Brian Osman <brianosman@google.com> 1621628586 -0400
committer Skia Commit-Bot <skia-commit-bot@chromium.org> 1621956651 +0000

Add test for runtime effects that don't need sample coords

As explained in the bug and comment - if the only reference to sample
coords is from a sample call that gets converted to pass-through, we
don't *actually* need the coords. We don't realize that with today's
analysis, so we end up generating a set of coords for the FP, which is
wasteful (adds an extra varying).

Bug: skia:11869
Change-Id: Iff818bb2c3deb96162a8cf107ccf4ecb35344bb1
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/411244
Reviewed-by: John Stiles <johnstiles@google.com>
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>