Android Open Source - 4est Skybox

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License

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

package com.wordsaretoys.forest;
//from  w ww . j a va  2  s  .co m
import java.util.Random;

import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.RadialGradient;
import android.graphics.Shader.TileMode;

import com.wordsaretoys.rise.glwrapper.Mesh;
import com.wordsaretoys.rise.glwrapper.Shader;
import com.wordsaretoys.rise.glwrapper.Texture;
import com.wordsaretoys.rise.meshutil.IndexBuffer;
import com.wordsaretoys.rise.meshutil.VertexBuffer;
import com.wordsaretoys.rise.utility.Asset;

/**
 * generates and displays the skybox
 */
public class Skybox {

  static float Radius = 50;
  
  Shader shader;

  Texture texture;
  int texId;

  Mesh mesh;
  
  Random rng = new Random();
  
  /**
   * ctor; creates GL objects
   * must be called in GL context
   */
  public Skybox() {
    
    shader = new Shader();
    shader.build(
          Asset.getTextAsset(Shared.context, "shader/skyboxVert.glsl"),
          Asset.getTextAsset(Shared.context, "shader/skyboxFrag.glsl")
        );

    Bitmap wrap = makeMain();
    Bitmap end0 = makeEnds();
    Bitmap end1 = makeEnds();
    
    texture = new Texture(
        Bitmap.createBitmap(wrap, 0, 0, 512, 512),
        end0,
        Bitmap.createBitmap(wrap, 1536, 0, 512, 512),
        Bitmap.createBitmap(wrap, 1024, 0, 512, 512),
        end1,
        Bitmap.createBitmap(wrap, 512, 0, 512, 512));
    texId = shader.getUniformId("image");
    
    int[] attr = {
        shader.getAttributeId("position"), 3,
        shader.getAttributeId("texturec"), 3,
    };
    mesh = new Mesh(attr);
    
    VertexBuffer vertex = new VertexBuffer();
    IndexBuffer index = new IndexBuffer();

    vertex.set(-Radius, -Radius, -Radius, -1, -1, -1);
    vertex.set(-Radius, Radius, -Radius, -1, 1, -1);
    vertex.set(Radius, -Radius, -Radius, 1, -1, -1);
    vertex.set(Radius, Radius, -Radius, 1, 1, -1);
    vertex.set(Radius, -Radius, Radius, 1, -1, 1);
    vertex.set(Radius, Radius, Radius, 1, 1, 1);
    vertex.set(-Radius, -Radius, Radius, -1, -1, 1);
    vertex.set(-Radius, Radius, Radius, -1, 1, 1);
    
    index.set(0, 3, 1, 0, 2, 3);
    index.set(2, 5, 3, 2, 4, 5);
    index.set(4, 7, 5, 4, 6, 7);
    index.set(6, 1, 7, 6, 0, 1);
    index.set(3, 5, 7, 3, 7, 1);
    index.set(2, 6, 4, 2, 0, 6);
    
    mesh.build(vertex, index);
  }

  /**
   * draw the mesh
   */
  public void draw() {
    shader.activate();
    shader.setMatrix("rotations", Shared.player.camera.rotations);
    shader.setMatrix("projector", Shared.player.camera.projector);
    
    texture.bind(0, texId);
    mesh.draw();
  }

  Bitmap makeMain() {
    Paint p = new Paint();
    p.setColor(Color.WHITE);
    p.setStyle(Paint.Style.FILL);
    
    Bitmap b = Bitmap.createBitmap(2048, 512, Bitmap.Config.ARGB_8888);
    Canvas canvas = new Canvas(b);
    
    for (int i = 0; i < 4000; i++) {
      canvas.drawPoint(rng.nextInt(2048), rng.nextInt(512), p);
    }
    
    int[] rgc = { 0xffffffcc, 0xffeeeebb, 0 };
    float[] rgp = {0, 0.5f, 1 };
    RadialGradient rg = new RadialGradient(256, 256, 256, rgc, rgp, TileMode.CLAMP);
    p.setShader(rg);
    canvas.drawCircle(256, 256, 256, p);
/*    
    p.setShader(null);
    p.setColor(0x3fffffff);
    for (int i = 0; i < 18192; i++) {
      float cx = rng.nextInt(2048);
      float cy = 256 + rng.nextInt(64) - 32;
      float r = rng.nextFloat() * 24;
      int k = rng.nextInt(256);
      p.setColor(0x0f000000 | k | (k << 8) | (k << 16));
      canvas.drawCircle(cx, cy, r, p);
    }
*/    
    return b;
  }
  
  Bitmap makeEnds() {
    Paint p = new Paint();
    p.setColor(Color.WHITE);
    p.setStyle(Paint.Style.FILL);
    
    Bitmap b = Bitmap.createBitmap(512, 512, Bitmap.Config.ARGB_8888);
    Canvas canvas = new Canvas(b);
    for (int i = 0; i < 1000; i++) {
      canvas.drawPoint(rng.nextInt(512), rng.nextInt(512), p);
    }
    return b;
  }
}
Java Source Code List
