Android Open Source - thread-android Brush

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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;
/*  ww w  .j  a v  a2s  . com*/
import android.opengl.GLES20;

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

public class Brush {

  private long seed;
  
  private Random rng;
  
  private Camera camera;
  private Textures textures;
  private World world;
  
  private Shader shader;
  private Mesh mesh;
  
  private int modelviewId;
  private int projectorId;
  private int walk0Id;
  private int stem0Id;
  
  public Brush(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_fog) +
          Shader.getText(Main.display.context, R.raw.fs_brush)
        );

        modelviewId = shader.getUniformId("modelview");
        projectorId = shader.getUniformId("projector");
        walk0Id = shader.getUniformId("walk0");
        stem0Id = shader.getUniformId("stem0");
        
        mesh = new Mesh();
        mesh.add(shader.getAttributeId("position"), 3);
        mesh.add(shader.getAttributeId("texture"), 2);
        mesh.retain = true;
  }
  
  public void update(double pz) {
    mesh.reset();
    int i, j, k;
    double iz, x, y, z, a, r, s;
    // 16 cells because path/cliff is 16 units long in z-direction
    for (i = -8; i < 8; i++) {
      iz = pz + i;
      // same random seed for each cell
      rng.reseed((long)Math.abs(iz * seed + 1));
      // place 25 bits of brush at random positions/sizes
      for (j = 0; j < 25; j++) {
        s = rng.get() < 0.5 ? -1 : 1;
        z = iz + rng.get(0, 1);
        y = world.roadHeight(z) - 0.0025;
        x = world.cliffSurface(y, z) + s * (0.5 - rng.get(0, 0.15));
        r = rng.get(0.01, 0.1);
        a = rng.get(0, Math.PI);
        // each brush consists of 4 triangles
        // rotated around the center point
        for (k = 0; k < 4; k++) {
          mesh.set(x, y, z, 0, 0);
          mesh.set(x + r * Math.cos(a), y + r, z + r * Math.sin(a), -1, 1);
          a = a + Math.PI * 0.5;
          mesh.set(x + r * Math.cos(a), y + r, z + r * Math.sin(a), 1, 1);
        }
      }
    }
  }
  
  public void updateGL() {
    mesh.build();
  }
  
  public void drawGL() {
    GLES20.glDisable(GLES20.GL_BLEND);
    GLES20.glDisable(GLES20.GL_CULL_FACE);
        shader.activate();
        GLES20.glUniformMatrix4fv(modelviewId, 1, false, camera.modelview, 0);
        GLES20.glUniformMatrix4fv(projectorId, 1, false, camera.projector, 0);
        textures.walk0.bind(0, walk0Id);
        textures.stem0.bind(0, stem0Id);
        mesh.draw();
  }
}

Java Source Code List

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