GLTutorialTen.java

package edu.union;

import javax.microedition.khronos.opengles.GL10;

import android.content.Context;
import android.opengl.GLU;
import android.view.KeyEvent;

/**
 * Approximately corresponds to: http://www.zeuscmd.com/tutorials/opengles/22-Fog.php
 * @author bburns
 *
 */
public class GLTutorialTen extends GLTutorialBase {
	float[] lightPos = new float[] {0,0,3,1};
	float lightAmbient[] = new float[] { 0.3f, 0.3f, 0.3f, 1.0f };
	float lightDiffuse[] = new float[] { 1f, 1f, 1f, 1.0f };

	float matAmbient[] = new float[] { 0.6f, 0.6f, 0.6f, 1.0f };
	float matDiffuse[] = new float[] { 0.6f, 0.6f, 0.6f, 1.0f };
	
	int tex;
	boolean fog;
	
	float fogColor[] = { 0.5f, 0.5f, 0.5f, 1.0f };
	
	public GLTutorialTen(Context c) {
		super(c, 20);
	}
	
	protected void init(GL10 gl) {
		gl.glEnable(GL10.GL_LIGHTING);
		gl.glEnable(GL10.GL_LIGHT0);
		
		gl.glLightfv(GL10.GL_LIGHT0, GL10.GL_AMBIENT, lightAmbient,	0);
		gl.glLightfv(GL10.GL_LIGHT0, GL10.GL_DIFFUSE, lightDiffuse,	0);
		gl.glLightfv(GL10.GL_LIGHT0, GL10.GL_POSITION, lightPos, 0);
		
		gl.glEnable(GL10.GL_DEPTH_TEST);
		gl.glClearDepthf(1.0f);
		gl.glEnable(GL10.GL_TEXTURE_2D);
		gl.glEnable(GL10.GL_CULL_FACE);
		
		gl.glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
		gl.glClearDepthf(1.0f);
		
		gl.glVertexPointer(3, GL10.GL_FLOAT, 0, cubeBuff);
		gl.glEnableClientState(GL10.GL_VERTEX_ARRAY);
		gl.glTexCoordPointer(2, GL10.GL_FLOAT, 0, texBuff);
		gl.glEnableClientState(GL10.GL_TEXTURE_COORD_ARRAY);
		
		gl.glShadeModel(GL10.GL_SMOOTH);
		
		tex = loadTexture(gl, R.drawable.block);

		gl.glFogf(GL10.GL_FOG_MODE, GL10.GL_EXP);;
		gl.glFogfv(GL10.GL_FOG_COLOR, fogColor, 0);
		gl.glFogf(GL10.GL_FOG_DENSITY, 0.75f);
		gl.glHint(GL10.GL_FOG_HINT, GL10.GL_DONT_CARE);
		gl.glFogf(GL10.GL_FOG_START, 1.0f);
		gl.glFogf(GL10.GL_FOG_END, 5.0f);
		gl.glEnable(GL10.GL_FOG);	
	}
	
	float xrot = 0.0f;
	float yrot = 0.0f;
	
	public void onDrawFrame(GL10 gl) {
		if (fog) {
			gl.glEnable(GL10.GL_FOG);
		}
		else {
			gl.glDisable(GL10.GL_FOG);
		}
		
		gl.glClear(GL10.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT);

		setupCube(gl);
		
		gl.glMatrixMode(GL10.GL_MODELVIEW);
		gl.glLoadIdentity();
		GLU.gluLookAt(gl, 0, 0, 3, 0, 0, 0, 0, 1, 0);
		gl.glPushMatrix();
		
		gl.glRotatef(xrot, 1, 0, 0);
		gl.glRotatef(yrot, 0, 1, 0);

		gl.glBindTexture(GL10.GL_TEXTURE_2D, tex);
		gl.glEnable(GL10.GL_TEXTURE_2D);
		gl.glMaterialfv(GL10.GL_FRONT_AND_BACK, GL10.GL_AMBIENT, matAmbient, 0);
		gl.glMaterialfv(GL10.GL_FRONT_AND_BACK, GL10.GL_DIFFUSE, matDiffuse, 0);
		
		drawCube(gl);
		
		xrot+=1f;
		yrot+=0.5f;
	}
	
	@Override
	public boolean onKeyDown(int keyCode, KeyEvent event) {
		if (event.getKeyCode() == KeyEvent.KEYCODE_DPAD_LEFT) {
			fog = true;
		}
		else if (event.getKeyCode() == KeyEvent.KEYCODE_DPAD_RIGHT) {
			fog = false;
		}	
		return super.onKeyDown(keyCode, event);
	}
}