Android Open Source - geoar-app Texture Feature Shader

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License

The source code is released under:
Apache License
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Java Source Code

/**
 * Copyright 2012 52North Initiative for Geospatial Open Source Software GmbH
 *// www. ja v  a2 s .  c om
 * 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.
 */
package org.n52.geoar.view.geoar.gl.mode;

public class TextureFeatureShader extends FeatureShader {

  //@formatter:off
  private final static String vertexShader = 
      "uniform mat4 " + UNIFORM_MATRIX_MVP + ";        \n" +   
      "uniform mat4 " + UNIFORM_MATRIX_MV + ";        \n" +  
//      "uniform vec3 " + UNIFORM_VEC3_LIGHTPOS + ";      \n" +   
      
      "attribute vec4 " + ATTRIBUTE_POSITION + ";        \n" +  
      "attribute vec4 " + ATTRIBUTE_COLOR + ";        \n" +  
      "attribute vec4 " + ATTRIBUTE_NORMAL + ";        \n" +   
      "attribute vec2 " + ATTRIBUTE_TEXTURE + ";        \n" +   
      
      /** color varying for fragment shader */
      "varying vec3 vPosition;                \n" +
      "varying vec4 vColor;                  \n" +  
      "varying vec3 vNormal;                  \n" +
      "varying vec2 vTexCoordinate;              \n" + 
      
      "void main()                      \n" +
      "{                                          \n" + 
      
      // TODO position is something we already calculated
      /** transform vertex and normals into model coordinates */
      "   vPosition = vec3(" + UNIFORM_MATRIX_MV + " * " + ATTRIBUTE_POSITION + ");        \n" +
      "  vColor = " + ATTRIBUTE_COLOR + ";                            \n" +
      "  vNormal = normalize(vec3(" + UNIFORM_MATRIX_MV + " * " + ATTRIBUTE_NORMAL + "));          \n" +
      "  vTexCoordinate = " + ATTRIBUTE_TEXTURE + ";                        \n" +
      
      /** set position */
      "   gl_Position = " + UNIFORM_MATRIX_MVP + " * " + ATTRIBUTE_POSITION + ";           \n" + 
      "}                                                   \n";
  
  private final static String fragmentShader = 
      "precision mediump float;            \n" +
      "uniform vec3 " + UNIFORM_VEC3_LIGHTPOS + ";  \n" +
      "uniform sampler2D " + UNIFORM_SAMPLER_TEXTURE + ";  \n" +
      
      /** color varying for fragment shader */
      "varying vec4 vColor;                  \n" +  
      "varying vec3 vPosition;                \n" +
      "varying vec3 vNormal;                  \n" +
      "varying vec2 vTexCoordinate;              \n" + 
      
      "void main()                  \n" +
      "{                        \n" +
      
      /** calculate the distance and the normlized light vector */
      "  float dist = length("+ UNIFORM_VEC3_LIGHTPOS + " - vPosition)/100.0;      \n" + 
      "   vec3 lightVec = normalize(" + UNIFORM_VEC3_LIGHTPOS + " - vPosition);   \n" +
      "   float diffuse = max(dot(vNormal, lightVec), 0.0);             \n" +
      "  diffuse = diffuse * (1.0 / ( 0.25 * dist * dist));           \n" +
      "   diffuse = diffuse + 0.6;                         \n" +
      
//      "  vec3 lightVec = normalize(" + UNIFORM_VEC3_LIGHTPOS + " - vPosition); \n" +
//      "  float lightVec \n" +

      // Removed alpha from lighting
      "   vec4 color = vColor * texture2D(" + UNIFORM_SAMPLER_TEXTURE + ", vTexCoordinate);\n" +
      "   color.rgb = color.rgb * diffuse; \n" +
      "  gl_FragColor = color; \n" +
      "}                        \n";        
  //@formatter:on
  
  private static FeatureShader instance;
  
  public static FeatureShader getInstance() {
    if (instance == null) {
      instance = new FeatureShader(vertexShader, fragmentShader);
    }

    return instance;
  }

  private TextureFeatureShader(String vertexShader, String fragmentShader) {
    /** unused */
    super(vertexShader, fragmentShader);
  }

}
Java Source Code List
