Android Open Source - 4est Shader

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License

The source code is released under:

MIT License

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Java Source Code

package com.wordsaretoys.rise.glwrapper;
/* w ww  .ja v  a 2s . co m*/
import android.opengl.GLES20;
import android.util.Log;


/**
 * maintains a shader program consisting of one
 * vertex shader function and one fragment shader
 * function. 
 * 
 * @author chris
 *
 */
public class Shader {

  private int vobj;
  private int fobj;
  private int program;
  
  public Shader() {
  }

  /**
   * generates GL shader program from source code
   * 
   * @param vertex source code for vertex shader
   * @param fragment source code for fragment shader
   * @throws Exception 
   */
  public boolean build(String vertex, String fragment) {
    String error;
    int[] status = new int[1];
    
    // compile the vertex shader
    vobj = GLES20.glCreateShader(GLES20.GL_VERTEX_SHADER);
    GLES20.glShaderSource(vobj, vertex);
    GLES20.glCompileShader(vobj);
    
    // check the compilation
    GLES20.glGetShaderiv(vobj, GLES20.GL_COMPILE_STATUS, status, 0);
    if (status[0] == 0) {
      error = GLES20.glGetShaderInfoLog(vobj);
      String reason = "vertex shader compile error: " + error;
      Log.e("shader", reason);
      return false;
    }

    // compile the fragment shader
    fobj =  GLES20.glCreateShader(GLES20.GL_FRAGMENT_SHADER);
    GLES20.glShaderSource(fobj, fragment);
    GLES20.glCompileShader(fobj);

    // check the compilation
    GLES20.glGetShaderiv(fobj, GLES20.GL_COMPILE_STATUS, status, 0);
    if (status[0] == 0) {
      error = GLES20.glGetShaderInfoLog(fobj);
      String reason = "fragment shader compile error: " + error;
      Log.e("shader", reason);
      return false;
    }

    // create and link the shader program
    program = GLES20.glCreateProgram();
    GLES20.glAttachShader(program, vobj);
    GLES20.glAttachShader(program, fobj);
    GLES20.glLinkProgram(program);

    // check the linkage
    GLES20.glGetShaderiv(program, GLES20.GL_LINK_STATUS, status, 0);
    if (status[0] == 0) {
      error = GLES20.glGetProgramInfoLog(program);
      String reason = "shader program link error: " + error;
      Log.e("shader", reason);
      return false;
    }
    
    return true;
  }
  
  /**
   * get attribute location id
   * @param name attribute variable name
   * @return id
   */
  public int getAttributeId(String name) {
    return GLES20.glGetAttribLocation(program, name);
  }
  
  /**
   * get uniform/sampler location id
   * @param name uniform variable name
   * @return id
   */
  public int getUniformId(String name) {
    return GLES20.glGetUniformLocation(program, name);
  }
  
  /**
   * activate the shader program
   */
  public void activate() {
    GLES20.glUseProgram(program);
  }
  
  /**
   * release the shader program
   */
  public void release() {
    GLES20.glDeleteShader(vobj);
    GLES20.glDeleteShader(fobj);
    GLES20.glDeleteProgram(program);
  }
  
  /**
   * set up a matrix
   */
  public void setMatrix(String label, float[] m) {
    GLES20.glUniformMatrix4fv(
        getUniformId(label), 1, false, m, 0);
  }
}

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