Android Open Source - agldemo Lesson07

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License

The source code is released under:

Copyright (c) 2013 Wenhao Li Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software...

Java Source Code

/**
 * Copyright (C) 2010 Wenhao Li. All Rights Reserved.
 * /*  w ww  .  j a va 2s .c o  m*/
 */
package com.agldemo.lessons;

import java.nio.FloatBuffer;

import javax.microedition.khronos.opengles.GL10;

import com.agldemo.Lesson;
import com.agldemo.R;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.opengl.GLU;

/**
 * Lesson 06
 */
public class Lesson07 extends Lesson {

  FloatBuffer quad = makeFloatBuffer(new float[] {
      // FRONT
      -1.0f, -1.0f, 1.0f,
      //
      1.0f, -1.0f, 1.0f,
      //
      1.0f, 1.0f, 1.0f,
      //
      -1.0f, 1.0f, 1.0f,

      // BACK
      -1.0f, -1.0f, -1.0f,
      //
      1.0f, -1.0f, -1.0f,
      //
      1.0f, 1.0f, -1.0f,
      //
      -1.0f, 1.0f, -1.0f,

      // LEFT
      -1.0f, -1.0f, -1.0f,
      //
      -1.0f, 1.0f, -1.0f,
      //
      -1.0f, 1.0f, 1.0f,
      //
      -1.0f, -1.0f, 1.0f,

      // RIGHT
      1.0f, -1.0f, -1.0f,
      //
      1.0f, 1.0f, -1.0f,
      //
      1.0f, 1.0f, 1.0f,
      //
      1.0f, -1.0f, 1.0f,

      // TOP
      -1.0f, 1.0f, -1.0f,
      //
      1.0f, 1.0f, -1.0f,
      //
      1.0f, 1.0f, 1.0f,
      //
      -1.0f, 1.0f, 1.0f,

      // BOTTOM
      -1.0f, -1.0f, -1.0f,
      //
      1.0f, -1.0f, -1.0f,
      //
      1.0f, -1.0f, 1.0f,
      //
      -1.0f, -1.0f, 1.0f, });

  FloatBuffer qtex = makeFloatBuffer(new float[] {
      // FRONT
      0.0f, 1.0f,
      //
      1.0f, 1.0f,
      //
      1.0f, 0.0f,
      //
      0.0f, 0.0f,

      // BACK
      0.0f, 1.0f,
      //
      1.0f, 1.0f,
      //
      1.0f, 0.0f,
      //
      0.0f, 0.0f,

      // LEFT
      0.0f, 1.0f,
      //
      1.0f, 1.0f,
      //
      1.0f, 0.0f,
      //
      0.0f, 0.0f,

      // RIGHT
      0.0f, 1.0f,
      //
      1.0f, 1.0f,
      //
      1.0f, 0.0f,
      //
      0.0f, 0.0f,

      // TOP
      0.0f, 0.0f,
      //
      1.0f, 0.0f,
      //
      1.0f, 1.0f,
      //
      0.0f, 1.0f,

      // BOTTOM
      0.0f, 0.0f,
      //
      1.0f, 0.0f,
      //
      1.0f, 1.0f,
      //
      0.0f, 1.0f, });

  // ambient light
  FloatBuffer lightAmbient = makeFloatBuffer(new float[] { 0.5f, 0.5f, 0.5f,
      1.0f });

  // diffuse light
  FloatBuffer lightDiffuse = makeFloatBuffer(new float[] { 1.0f, 1.0f, 1.0f,
      1.0f });

  // light position
  FloatBuffer lightPosition = makeFloatBuffer(new float[] { 0.0f, 0.0f, 2.0f,
      1.0f });

  // route
  float xrot = 0.0f;

  float yrot = 0.0f;

  float zrot = 0.0f;

  private Bitmap mBitmap;

  int texture = -1;

  public Lesson07(Context c) {
    super(c, "Lesson 07", "Texture Filters, Lighting & Keyboard Control");
    mBitmap = BitmapFactory.decodeResource(c.getResources(), R.drawable.crate);
  }

  public void onDrawFrame(GL10 gl, int width, int height) {
    float ratio = (float) width / height;
    gl.glMatrixMode(GL10.GL_PROJECTION);
    gl.glLoadIdentity();
    GLU.gluPerspective(gl, 45.0f, ratio, 0.1f, 100.0f);

    /* setup light */
    gl.glLightfv(GL10.GL_LIGHT1, GL10.GL_AMBIENT, lightAmbient);
    gl.glLightfv(GL10.GL_LIGHT1, GL10.GL_DIFFUSE, lightDiffuse);
    gl.glLightfv(GL10.GL_LIGHT1, GL10.GL_POSITION, lightPosition);
    gl.glEnable(GL10.GL_LIGHT1);

    /* Enable lighting */
    gl.glEnable(GL10.GL_LIGHTING);

    if (texture == -1) {
      texture = loadTexture(gl, mBitmap);
    }
    gl.glBindTexture(GL10.GL_TEXTURE_2D, texture);
    gl.glEnable(GL10.GL_TEXTURE_2D);

    // draw
    gl.glMatrixMode(GL10.GL_MODELVIEW);
    gl.glLoadIdentity();

    gl.glTranslatef(0.0f, 0.0f, -5.0f);

    gl.glRotatef(xrot, 1.0f, 0.0f, 0.0f);
    gl.glRotatef(yrot, 0.0f, 1.0f, 0.0f);
    gl.glRotatef(zrot, 0.0f, 0.0f, 1.0f);

    gl.glEnableClientState(GL10.GL_VERTEX_ARRAY);
    gl.glEnableClientState(GL10.GL_TEXTURE_COORD_ARRAY);

    gl.glVertexPointer(3, GL10.GL_FLOAT, 0, quad);
    gl.glTexCoordPointer(2, GL10.GL_FLOAT, 0, qtex);

    gl.glDrawArrays(GL10.GL_TRIANGLE_FAN, 0, 4);
    gl.glDrawArrays(GL10.GL_TRIANGLE_FAN, 4, 4);
    gl.glDrawArrays(GL10.GL_TRIANGLE_FAN, 8, 4);
    gl.glDrawArrays(GL10.GL_TRIANGLE_FAN, 12, 4);
    gl.glDrawArrays(GL10.GL_TRIANGLE_FAN, 16, 4);
    gl.glDrawArrays(GL10.GL_TRIANGLE_FAN, 20, 4);

    gl.glDisableClientState(GL10.GL_VERTEX_ARRAY);
    gl.glDisableClientState(GL10.GL_TEXTURE_COORD_ARRAY);

    // clean up
    gl.glDisable(GL10.GL_TEXTURE_2D);
    gl.glDisable(GL10.GL_LIGHT1);
    gl.glDisable(GL10.GL_LIGHTING);

    xrot += 0.6f;
    yrot += 0.4f;
    zrot += 0.8f;
  }

}

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