Android Open Source - thread-android Rocks

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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 w  ww.  ja  va 2 s. c  om*/
import android.opengl.GLES20;

import com.wordsaretoys.soar.Camera;
import com.wordsaretoys.soar.Mesh;
import com.wordsaretoys.soar.Random;
import com.wordsaretoys.soar.Shader;
import com.wordsaretoys.soar.Vector;

public class Rocks {

  private long seed;
  
  private Random rng;
  
  private Camera camera;
  private Textures textures;
  private World world;
  
  private Shader shader;
  private Mesh mesh;
  private Mesh.Iterator2D iter;
  
  private int modelviewId;
  private int projectorId;
  private int walk0Id;
  private int walk1Id;
  
  public Rocks(long seed, Camera camera, Textures textures, World world) {
    rng = new Random();
    this.seed = seed;
    this.camera = camera;
    this.textures = textures;
    this.world = world;
  }
  
  public void makeGL() {
    shader = new Shader();
        shader.build(
          Shader.getText(Main.display.context, R.raw.vs_general),
          Shader.getText(Main.display.context, R.raw.fs_materials) +
          Shader.getText(Main.display.context, R.raw.fs_fog) +
          Shader.getText(Main.display.context, R.raw.fs_rocks)
        );

        modelviewId = shader.getUniformId("modelview");
        projectorId = shader.getUniformId("projector");
        walk0Id = shader.getUniformId("walk0");
        walk1Id = shader.getUniformId("walk1");
        
        mesh = new Mesh();
        mesh.add(shader.getAttributeId("position"), 3);
        mesh.add(shader.getAttributeId("texture"), 2);
        mesh.retain = true;
        
        iter = new Mesh.Iterator2D(mesh, 6, 6, false);

  }
  
  public void update(double pz) {
    mesh.reset();
    Vector o = new Vector();
    int i, j;
    double iz, x, y, z, r, s;
    double tx, ty;
    for (i = -8; i < 8; i++) {
      iz = pz + i;
      // same random seed for each cell--though not
      // the same as the brush, or rocks would overlap!
      rng.reseed((long)Math.abs(iz * seed + 2));
      // twenty rocks per cell
      for (j = 0; j < 20; j++) {
        s = rng.get() < 0.5 ? -1 : 1;
        z = iz + rng.get(0, 1);
        y = world.roadHeight(z) - 0.005;
        x = world.cliffSurface(y, z) + s * (0.5 - rng.get(0.02, 0.25));
        r = rng.get(0.01, 0.03);
        tx = rng.get(0, 5);
        ty = rng.get(0, 5);
        // each rock is an upturned half-sphere
        iter.reset();
        while(!iter.done()) {
          double xr = iter.ir;
          double zr = iter.jr;
          o.x = 2 * (xr - 0.5);
          o.z = 2 * (zr - 0.5);
          o.y = (1 - o.x * o.x) * (1 - o.z * o.z);
          o.norm().mul(r);
          mesh.set(x + o.x, y + o.y, z + o.z, xr + tx, zr + ty);
          iter.next();
        }
        
      }
    }
  }
  
  public void updateGL() {
    mesh.build();
  }
  
  public void drawGL() {
    GLES20.glDisable(GLES20.GL_BLEND);
    GLES20.glEnable(GLES20.GL_CULL_FACE);
    GLES20.glCullFace(GLES20.GL_BACK);
        shader.activate();
        GLES20.glUniformMatrix4fv(modelviewId, 1, false, camera.modelview, 0);
        GLES20.glUniformMatrix4fv(projectorId, 1, false, camera.projector, 0);
        textures.walk0.bind(0, walk0Id);
        textures.walk1.bind(0, walk1Id);
        mesh.draw();
  }
}

Java Source Code List

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