skia2/resources/sksl/intrinsics/AbsFloat.sksl
John Stiles edac7716aa Evaluate single-argument generic intrinsics at compile time.
In particular, this optimizes abs() and sign() when all inputs are known
at compile time. This resolves a TODO on a test case in
`IllegalIndexing.rts`.

Change-Id: Ica310522a85b42dc7ae255bd25004a6629d04176
Bug: skia:10835
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/405676
Auto-Submit: John Stiles <johnstiles@google.com>
Commit-Queue: John Stiles <johnstiles@google.com>
Reviewed-by: Ethan Nicholas <ethannicholas@google.com>
2021-05-10 14:50:50 +00:00

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uniform half4 testInputs; // equals (-1.25, 0, 0.75, 2.25)
uniform half4 colorGreen, colorRed;
half4 main(float2 coords) {
const half4 constVal = half4(-1.25, 0, 0.75, 2.25);
half4 expected = half4(1.25, 0, 0.75, 2.25);
return (abs(testInputs.x) == expected.x &&
abs(testInputs.xy) == expected.xy &&
abs(testInputs.xyz) == expected.xyz &&
abs(testInputs.xyzw) == expected.xyzw &&
abs(constVal.x) == expected.x &&
abs(constVal.xy) == expected.xy &&
abs(constVal.xyz) == expected.xyz &&
abs(constVal.xyzw) == expected.xyzw) ? colorGreen : colorRed;
}