skia2/resources/sksl/intrinsics/MaxFloat.sksl
John Stiles 7f17d36c2c Implement compile-time optimization for min() and max().
`evaluate_intrinsic_1_of_type` was rewritten and now supports up to
three arguments. The following APIs are now optimizable:

	$genType min($genType x, $genType y);
	$genType min($genType x, float y);
	$genHType min($genHType x, $genHType y);
	$genHType min($genHType x, half y);
	$genIType min($genIType x, $genIType y);
	$genIType min($genIType x, int y);
	$genType max($genType x, $genType y);
	$genType max($genType x, float y);
	$genHType max($genHType x, $genHType y);
	$genHType max($genHType x, half y);
	$genIType max($genIType x, $genIType y);
	$genIType max($genIType x, int y);

Change-Id: I0a6467fb60b008b61e8b6a7affaebfcb15f5f7a9
Bug: skia:12034
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/412057
Commit-Queue: John Stiles <johnstiles@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
2021-05-25 14:52:11 +00:00

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