/*
 * Copyright 2018 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 highp float;
precision highp int;
uniform sampler2D texture;
uniform vec3 color;
varying vec2 v_textureCoords;
varying float v_alpha;

void main() {
  float r = texture2D(texture, v_textureCoords).r;
  gl_FragColor = vec4(color.xyz, r * v_alpha);
}
