skia2/resources/sksl/intrinsics/Round.sksl
John Stiles 33ef30ec68 Optimize remaining simple 1-argument intrinsics.
Aside from sqrt() and normalize(), we now optimize all the intrinsics
which take a single argument as input, and return that argument with
each of its components permuted as output.

This CL also introduces a minor restriction--we no longer optimize
intrinsics which evaluate to inf or nan, such as `inversesqrt(-1)`.
These will be left in the source as-is.

Change-Id: I4919b3c18a2df81accd6daf2f650b9f587ff43fc
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/406577
Commit-Queue: John Stiles <johnstiles@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
Reviewed-by: Ethan Nicholas <ethannicholas@google.com>
2021-05-11 16:44:09 +00:00

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uniform half4 input, expected;
uniform half4 colorGreen, colorRed;
half4 main(float2 coords) {
const half4 constVal = half4(-1.5, -0.5, 0.5, 1.5);
return (round(input.x) == expected.x &&
round(input.xy) == expected.xy &&
round(input.xyz) == expected.xyz &&
round(input.xyzw) == expected.xyzw &&
round(constVal.x) == expected.x &&
round(constVal.xy) == expected.xy &&
round(constVal.xyz) == expected.xyz &&
round(constVal.xyzw) == expected.xyzw) ? colorGreen : colorRed;
}