| // Copyright 2020 The Cobalt Authors. All Rights Reserved. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| precision mediump float; |
| uniform sampler2D u_texture; |
| uniform vec4 u_texcoord_transform; // (u-scale, u-add, u-max, v-center) |
| uniform float u_opacity; |
| varying vec2 v_offset; |
| |
| void main() { |
| vec2 texcoord = vec2( |
| min(length(v_offset) * u_texcoord_transform.x + u_texcoord_transform.y, |
| u_texcoord_transform.z), |
| u_texcoord_transform.w); |
| gl_FragColor = texture2D(u_texture, texcoord) * u_opacity; |
| } |