text: /*
   * Copyright 2019. Google LLC
   *
   * 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
   *
   *     https://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.
   */
  
  package com.google.android.apps.playgames.simpleengine;
  
  public class ShaderSource {
  
      private static final String COMMON_DECLS =
              "precision mediump float;       \n"
                      + "uniform mat4 u_Matrix;         \n"
                      + "uniform vec4 u_Color;         \n"
                      + "uniform float u_TintFactor;    \n"
                      + "uniform sampler2D u_Sampler;   \n "
                      + "varying vec4 v_Color;          \n"
                      + "varying vec2 v_TexCoord;      \n";
  
      public static final String VERTEX_SHADER =
              COMMON_DECLS
                      + "attribute vec4 a_Position;     \n"
                      + "attribute vec2 a_TexCoord;     \n"
                      + "void main()                    \n"
                      + "{                              \n"
                      + "   v_Color = u_Color;          \n"
                      + "   v_TexCoord = a_TexCoord;    \n"
                      + "   gl_Position = u_Matrix * a_Position; \n"
                      + "}                              \n";
  
      public static final String FRAG_SHADER =
              COMMON_DECLS
                      + "void main()                    \n"
                      + "{                              \n"
                      + "   vec4 c = mix(texture2D(u_Sampler, v_TexCoord), u_Color, u_TintFactor);\n"
                      + "   gl_FragColor = c;\n"
                      + "}\n";
  }
  