skia2/resources/sksl/intrinsics/ClampFloat.sksl
John Stiles 0727a80885 Implement compile-time optimization for clamp().
$genType clamp($genType x, $genType minVal, $genType maxVal);
$genType clamp($genType x, float minVal, float maxVal);
$genHType clamp($genHType x, $genHType minVal, $genHType maxVal);
$genHType clamp($genHType x, half minVal, half maxVal);
$genIType clamp($genIType x, $genIType minVal, $genIType maxVal);
$genIType clamp($genIType x, int minVal, int maxVal);

Change-Id: I726270e84fca781825e59abed0c8c7d099ca7444
Bug: skia:12034
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/411839
Commit-Queue: John Stiles <johnstiles@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
2021-05-25 16:25:42 +00:00

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uniform half4 testInputs;
uniform half4 colorGreen, colorRed;
half4 main(float2 coords) {
half4 expectedA = half4(-1, 0, 0.75, 1);
const half4 clampLow = half4(-1, -2, -2, 1);
const half4 constVal = half4(-1.25, 0, 0.75, 2.25);
half4 expectedB = half4(-1, 0, 0.5, 2.25);
const half4 clampHigh = half4( 1, 2, 0.5, 3);
return (clamp(testInputs.x, -1, 1) == expectedA.x &&
clamp(testInputs.xy, -1, 1) == expectedA.xy &&
clamp(testInputs.xyz, -1, 1) == expectedA.xyz &&
clamp(testInputs.xyzw, -1, 1) == expectedA.xyzw &&
clamp(constVal.x, -1, 1) == expectedA.x &&
clamp(constVal.xy, -1, 1) == expectedA.xy &&
clamp(constVal.xyz, -1, 1) == expectedA.xyz &&
clamp(constVal.xyzw, -1, 1) == expectedA.xyzw &&
clamp(testInputs.x, clampLow.x, clampHigh.x ) == expectedB.x &&
clamp(testInputs.xy, clampLow.xy, clampHigh.xy ) == expectedB.xy &&
clamp(testInputs.xyz, clampLow.xyz, clampHigh.xyz ) == expectedB.xyz &&
clamp(testInputs.xyzw, clampLow.xyzw, clampHigh.xyzw) == expectedB.xyzw &&
clamp(constVal.x, clampLow.x, clampHigh.x ) == expectedB.x &&
clamp(constVal.xy, clampLow.xy, clampHigh.xy ) == expectedB.xy &&
clamp(constVal.xyz, clampLow.xyz, clampHigh.xyz ) == expectedB.xyz &&
clamp(constVal.xyzw, clampLow.xyzw, clampHigh.xyzw) == expectedB.xyzw) ? colorGreen
: colorRed;
}