Rather than taking the x and y values separately (ax, ay, bx, by),
simply take two vec<N*2>'s (a, b), where the x's are in a.lo and the
y's in a.hi.
Bug: skia:10419
Change-Id: I21d659c79247ccb625351c20b93c550d0afffe79
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/339458
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Chris Dalton <csmartdalton@google.com>
This method is only valid in the range 2^(+/-30) due to fp32 overflow.
Adds a comment to the function and updates its test.
TBR=bsalomon@google.com
Change-Id: Ifa2fc0ed4a7f9123f0bebaa02c666c61e06e62a6
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/331481
Reviewed-by: Chris Dalton <csmartdalton@google.com>
Commit-Queue: Chris Dalton <csmartdalton@google.com>
Adds grvx, Ganesh's addendum to skvx. Here we introduce familiar names
and operations from GPU languages, as well as functions that are
approximate and/or have LSB differences from platform to platform.
The initial implementation has: fast_fma, fast_acos, and
fast_angle_between_vectors. When a function is approximate, its error
range is well documented and tested.
Also establishes GrWangsFormula as the first user of grvx.
Bug: skia:10419
Change-Id: Id0682599cf9c0303eff386095afc3ef9f3a7fa1b
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/330119
Commit-Queue: Chris Dalton <csmartdalton@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
