| // 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. |
| |
| #include <impeller/color.glsl> |
| |
| // Creates a color filter that applies the inverse of the sRGB gamma curve |
| // to the RGB channels. |
| |
| uniform sampler2D input_texture; |
| |
| in vec2 v_position; |
| out vec4 frag_color; |
| |
| void main() { |
| vec4 input_color = texture(input_texture, v_position); |
| |
| for (int i = 0; i < 4; i++) { |
| if (input_color[i] <= 0.04045) { |
| input_color[i] = input_color[i] / 12.92; |
| } else { |
| input_color[i] = pow((input_color[i] + 0.055) / 1.055, 2.4); |
| } |
| } |
| |
| frag_color = input_color; |
| } |