tree 1f863c46e98df2320acacc2023540295b0d64f8b
parent 0095fcb5ebfb7d8ed00b334d9c166fb79ce2d9a3
author Brian Osman <brianosman@google.com> 1621864359 -0400
committer Skia Commit-Bot <skia-commit-bot@chromium.org> 1621956956 +0000

Elide sample coords for GrSkSLFP if only used for pass-through sampling

If every use of the coords passed to main was for a call to sample that
was converted to pass-through sampling... We don't actually reference
the sample coords, so we can un-set the flag. This prevents the FP from
requesting an extra set of (unused) coords, which saves a varying
between the vertex and fragment shaders.

Bug: skia:11869
Change-Id: I4e15876031717b8bcf642e742bad8ae26d6bd020
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/411871
Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: Michael Ludwig <michaelludwig@google.com>