/*
Copyright (c) 2004, Bradley L. Jones
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
* Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
* Neither the name of the nondot.org nor the names of its contributors may
be used to endorse or promote products derived from this software without
specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
*/
package org.nondot.particlesystem;
import net.java.games.jogl.*;
import java.util.*;
import org.nondot.math.Vector3f;
/**
*
*/
public abstract class ParticleSystem
{
private int maxParticles;
private LinkedList liveParticles;
private ArrayList deadParticles;
private Vector3f location;
public ParticleSystem(int maxParticles) {
location = Vector3f.createZeroVector();
liveParticles = new LinkedList();
deadParticles = new ArrayList(maxParticles);
this.maxParticles = maxParticles;
for(int i = 0; i < maxParticles; ++i) {
deadParticles.add(createParticle());
}
}
public void update(float timeStep) {
updateLiveParticles(timeStep);
removeDeadParticles();
spawnNewParticles();
}
public void setLocation(Vector3f location) {
this.location = location;
}
public Vector3f getLocation() {
return location;
}
public int getMaxParticles() {
return maxParticles;
}
public int getNumDeadParticles() {
return deadParticles.size();
}
public int getNumLiveParticles() {
return liveParticles.size();
}
protected abstract void spawnNewParticles();
protected void removeDeadParticles() {
ListIterator li = liveParticles.listIterator();
while(li.hasNext()) {
Particle p = (Particle)li.next();
if(!p.isAlive()) {
li.remove();
deadParticles.add(p);
}
}
}
protected void spawnNewParticle() {
if(deadParticles.size() == 0) {
throw new IllegalStateException("Max number of particles reached, cannot create more.");
}
Particle p = (Particle)deadParticles.get(deadParticles.size()-1);
deadParticles.remove(deadParticles.size()-1);
p.spawn(getLocation());
liveParticles.addFirst(p);
}
protected void updateLiveParticles(float timeStep) {
Iterator it = liveParticles.iterator();
while(it.hasNext()) {
Particle p = (Particle)it.next();
p.update(timeStep);
}
}
public void render(GL gl) {
gl.glEnable(GL.GL_TEXTURE_2D);
gl.glEnable(GL.GL_BLEND);
gl.glEnable(GL.GL_POINT_SPRITE_NV);
gl.glBlendFunc(GL.GL_SRC_ALPHA,GL.GL_ONE_MINUS_SRC_ALPHA);
gl.glTexEnvf(GL.GL_POINT_SPRITE_NV, GL.GL_COORD_REPLACE_NV, GL.GL_TRUE);
gl.glBegin(GL.GL_POINTS);
Iterator i = liveParticles.iterator();
while(i.hasNext()) {
Particle p = (Particle)i.next();
p.render(gl);
}
gl.glEnd();
}
protected abstract Particle createParticle();
}
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