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/*
* Copyright 2017 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
enum class Mode {
kGaussian = 0,
kSmoothStep = 1
};
layout(key) in Mode mode;
void main() {
half factor = 1.0 - sk_InColor.a;
@switch (mode) {
case Mode::kGaussian:
factor = exp(-factor * factor * 4.0) - 0.018;
break;
case Mode::kSmoothStep:
factor = smoothstep(1.0, 0.0, factor);
break;
}
sk_OutColor = half4(factor);
}
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