| /* | |
| * Copyright 2017 Google Inc. | |
| * | |
| * Use of this source code is governed by a BSD-style license that can be | |
| * found in the LICENSE file. | |
| */ | |
| in fragmentProcessor inputFP; | |
| half4 main() { | |
| half inputAlpha = sample(inputFP).a; | |
| half factor = 1.0 - inputAlpha; | |
| factor = half(exp(-factor * factor * 4.0) - 0.018); | |
| return half4(factor); | |
| } |