| /* | |
| * 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 = half(exp(-factor * factor * 4.0) - 0.018); | |
| break; | |
| case Mode::kSmoothStep: | |
| factor = smoothstep(1.0, 0.0, factor); | |
| break; | |
| } | |
| sk_OutColor = half4(factor); | |
| } |