| #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; |
| |
| void main() { |
| fragColor = |
| vec4(0.0, |
| // dot product of incident vector (2nd param) and reference vector |
| // (3rd param) is non-negative, so the negated first param is |
| // returned, and its first value is 1.0. |
| faceforward(vec2(-a, 5.0), vec2(1.0, 2.0), vec2(3.0, 4.0))[0], 0.0, |
| // dot product of incident vector (2nd param) and reference vector |
| // (3rd param) is negative, so the original first param is returned, |
| // and its second value is 5.0, so subtract 4.0 to get 1.0. |
| faceforward(vec2(a, 5.0), vec2(1.0, -2.0), vec2(3.0, 4.0))[1] - 4.0); |
| } |
