Implement compile-time optimization for mix().
mix() has many overloads:
$genType mix($genType x, $genType y, $genType a);
$genType mix($genType x, $genType y, float a);
$genHType mix($genHType x, $genHType y, $genHType a);
$genHType mix($genHType x, $genHType y, half a);
$genType mix($genType x, $genType y, $genBType a);
$genHType mix($genHType x, $genHType y, $genBType a);
$genIType mix($genIType x, $genIType y, $genBType a);
$genBType mix($genBType x, $genBType y, $genBType a);
The top half were simple to implement via `evaluate_3_way_intrinsic`.
The bottom half--`x, y, $genBType`--required adding basic support into
`evaluate_n_way_intrinsic_of_type` for mixed argument types, since `x`
and `y` could be of any numeric type, but `a` is always boolean.
Fortunately, this didn't require major changes.
Change-Id: I015471f053c90d5a5c3ac67cc230d0f90950ff60
Bug: skia:12034
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/414443
Commit-Queue: John Stiles <johnstiles@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
Reviewed-by: Ethan Nicholas <ethannicholas@google.com>
2021-06-01 17:31:35 +00:00
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return ((((((((((((((((((mix(colorGreen, colorRed, 0.0) == vec4(0.0, 1.0, 0.0, 1.0) && mix(colorGreen, colorRed, 0.25) == vec4(0.25, 0.75, 0.0, 1.0)) && mix(colorGreen, colorRed, 0.75) == vec4(0.75, 0.25, 0.0, 1.0)) && mix(colorGreen, colorRed, 1.0) == vec4(1.0, 0.0, 0.0, 1.0)) && mix(colorBlack.x, colorWhite.x, 0.5) == expectedBW.x) && mix(colorBlack.xy, colorWhite.xy, 0.5) == expectedBW.xy) && mix(colorBlack.xyz, colorWhite.xyz, 0.5) == expectedBW.xyz) && mix(colorBlack, colorWhite, 0.5) == expectedBW) && 0.5 == expectedBW.x) && vec2(0.5, 0.5) == expectedBW.xy) && vec3(0.5, 0.5, 0.5) == expectedBW.xyz) && vec4(0.5, 0.5, 0.5, 1.0) == expectedBW) && mix(colorWhite.x, testInputs.x, 0.0) == expectedWT.x) && mix(colorWhite.xy, testInputs.xy, vec2(0.0, 0.5)) == expectedWT.xy) && mix(colorWhite.xyz, testInputs.xyz, vec3(0.0, 0.5, 0.0)) == expectedWT.xyz) && mix(colorWhite, testInputs, vec4(0.0, 0.5, 0.0, 1.0)) == expectedWT) && 1.0 == expectedWT.x) && vec2(1.0, 0.5) == expectedWT.xy) && vec3(1.0, 0.5, 1.0) == expectedWT.xyz) && vec4(1.0, 0.5, 1.0, 2.25) == expectedWT ? colorGreen : colorRed;
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