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License

The source code is released under:

Copyright (c) 2012 Chris Gauthier, http://www.wordsaretoys.com Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "S...

Java Source Code

package com.wordsaretoys.thread;
/*from www.  j a  v a 2s  .  c  om*/
import android.opengl.GLES20;
import android.util.Log;

import com.wordsaretoys.soar.Camera;
import com.wordsaretoys.soar.GLObject;
import com.wordsaretoys.soar.Vector;

public class Path extends GLObject implements Runnable {

  private final double UPDATE_DISTANCE = 2.0;

  private Camera camera;
  private Textures textures;
  
  private Road road;
  private Cliff cliff;
  private Brush brush;
  private Rocks rocks;

  private Thread updateThread;
  private boolean updateGL = false;  
  
  public Path(Camera camera, Textures textures, World world) {
    this.textures = textures;
    this.camera = camera;

    cliff = new Cliff(camera, textures, world);
    road = new Road(camera, textures, world);
    brush = new Brush(Main.rng.nextLong(), camera, textures, world);
    rocks = new Rocks(Main.rng.nextLong(), camera, textures, world);
  }

  /**
   * generate GL objects and kick off update thread
   */
  public void onInit() {
    GLES20.glClearDepthf(1.0f);
    GLES20.glDepthFunc(GLES20.GL_LEQUAL);
    GLES20.glEnable(GLES20.GL_DEPTH_TEST);
    
    GLES20.glClearColor(0.75f, 0.75f, 0.75f, 1.0f);
    
    textures.makeGL();
    
    road.makeGL();
    cliff.makeGL();
    brush.makeGL();
    rocks.makeGL();
    
    updateThread = new Thread(this);
    updateThread.start();
    
    Log.i("Thread", "GL thread started.");
  }
  
  /**
   * update/draw any GL objects that require it
   */
  public void onUpdate() {

    if (updateGL) {
      road.updateGL();
      cliff.updateGL();
      brush.updateGL();
      rocks.updateGL();
      updateGL = false;
      Log.i("Thread", "GL thread updated");
    }
    
    GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT | GLES20.GL_DEPTH_BUFFER_BIT);
    
    road.drawGL();
    cliff.drawGL();
    brush.drawGL();
    rocks.drawGL();

  }

  /**
   * worker thread procedure, handles updates to meshes
   * note that it's NOT running in the GL thread context,
   * and must raise a signal to update the actual GL stuff
   */
  public void run() {
    Vector ppos = camera.position;
    Vector lastUpdate = new Vector(1000, 1000, 1000);
    boolean running = true;
    while(running) {
      // time to regenerate the meshes?
      if (lastUpdate.distance(ppos) > UPDATE_DISTANCE) {
        double z = Math.floor(ppos.z);
        
        road.update(z);
        cliff.update(z);
        brush.update(z);
        rocks.update(z);
        
        lastUpdate.copy(ppos);
        updateGL = true;
        
        Log.i("Thread", "Worker thread updated.");

      }

      // sleep unless interrupted
      // (main thread will interrupt if paused)
      try {
        Thread.sleep(100);
      } catch (InterruptedException e) {
        running = false;
      }
    }
  }
  
  public void stopThread() {
    updateThread.interrupt();
  }

}

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