skia2/resources/sksl/shared/SwizzleByConstantIndex.sksl
John Stiles 51d33982ad Add Convert/Make factory functions to IndexExpression.
Change-Id: I7a7874e58bf53978afce8a41b26092406b6490ed
Bug: skia:11342
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/380360
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: John Stiles <johnstiles@google.com>
2021-03-08 15:55:59 +00:00

39 lines
947 B
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uniform half4 testInputs, colorGreen, colorRed;
half4 constant_swizzle() {
half4 v = testInputs;
half x = v[0];
half y = v[1];
half z = v[2];
half w = v[3];
return half4(x, y, z, w); // -1.25, 0, 0.75, 2.25
}
half4 foldable_index() {
const int ZERO = 0, ONE = 1, TWO = 2, THREE = 3;
half x = testInputs[ZERO];
half y = testInputs[ONE];
half z = testInputs[TWO];
half w = testInputs[THREE];
return half4(x, y, z, w); // -1.25, 0, 0.75, 2.25
}
half4 foldable() {
half4 v = half4(0, 1, 2, 3);
half x = v[0];
half y = v[1];
half z = v[2];
half w = v[3];
return half4(x, y, z, w); // 0, 1, 2, 3
}
half4 main() {
half4 a = constant_swizzle();
half4 b = foldable_index();
half4 c = foldable();
return a == half4(-1.25, 0, 0.75, 2.25) &&
b == half4(-1.25, 0, 0.75, 2.25) &&
c == half4(0, 1, 2, 3) ? colorGreen : colorRed;
}