| // Copyright 2017 Google Inc. 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; | |
| } |