xref: /aosp_15_r20/cts/tests/openglperf2/assets/fragment/water (revision b7c941bb3fa97aba169d73cee0bed2de8ac964bf)

/*
 * Copyright (C) 2013 The Android Open Source Project
 *
 * 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 vec3 u_LightPos;
uniform sampler2D u_Texture1;
uniform sampler2D u_Texture2;
uniform int u_Time;
varying vec3 v_Position;
varying vec2 v_TexCoordinate;
void main() {
  float weight = abs(mod(float(u_Time), 101.0) - 50.0) / 50.0;// loop between 0.0 and 1.0
  float offset = abs(float(u_Time) / 1000.0);
  // Get normal from bump map.
  vec3 map1 = texture2D(u_Texture1, v_TexCoordinate + offset).xyz * 2.0 - 1.0;
  vec3 map2 = texture2D(u_Texture2, v_TexCoordinate + offset).xyz * 2.0 - 1.0;
  vec3 normal = normalize((map1 * weight) + (map2 * (1.0 - weight)));
  // Get a lighting direction vector from the light to the vertex.
  vec3 lightVector = normalize(u_LightPos - v_Position);
  // Calculate the dot product of the light vector and vertex normal.
  float diffuse = max(dot(lightVector, normal), 0.0);
  // Add ambient lighting
  diffuse = diffuse + 0.025;
  // Use the diffuse illumination to get final output color.
  gl_FragColor = vec4(1.0 - diffuse, 1.0 - diffuse, 1.0, 1.0 - (diffuse * 0.9));// Semi transparent blue.
}