| #version 320 es |
| |
| // Copyright 2013 The Flutter Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| precision highp float; |
| |
| layout(location = 0) out vec4 fragColor; |
| |
| layout(location = 0) uniform float a; |
| |
| // performs Hermite interpolation between two values: |
| // |
| // smoothstep(edge0, edge1, 0) { |
| // t = clamp((x - edge0) / (edge1 - edge0), 0.0, 1.0); |
| // return t * t * (3.0 - 2.0 * t); |
| // } |
| void main() { |
| fragColor = vec4( |
| // smoothstep(1.0, 5.0, 3.0) is 0.5, subtract to get 0.0 |
| smoothstep(a, 5.0, 3.0) - 0.5, |
| // smoothstep(0.0, 2.0, 1.0) is 0.5, add 0.5 to get 1.0 |
| smoothstep(0.0, 2.0, a) + 0.5, |
| 0.0, |
| 1.0 |
| ); |
| } |
