Package episode_38

Source Code of episode_38.ParticleDemo2D

/*
* Copyright (c) 2013, Oskar Veerhoek
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
*    list of conditions and the following disclaimer.
* 2. 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.
*
* 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.
*
* The views and conclusions contained in the software and documentation are those
* of the authors and should not be interpreted as representing official policies,
* either expressed or implied, of the FreeBSD Project.
*/

package episode_38;

import org.lwjgl.LWJGLException;
import org.lwjgl.input.Mouse;
import org.lwjgl.opengl.Display;
import org.lwjgl.opengl.DisplayMode;
import org.lwjgl.util.vector.Vector3f;

import static org.lwjgl.opengl.GL11.*;

public class ParticleDemo2D {

    private static ParticleEmitter particleEmitter = new ParticleEmitterBuilder()
            .setGravity(new Vector3f(0, -0.002f, 0))
            .setSpawningRate(50)
            .setEnable3D(false)
            .setParticleLifeTime(300)
            .createParticleEmitter();

    public static void main(String[] args) {
        setUpDisplay();
        setUpStates();
        while (!Display.isCloseRequested()) {
            input();
            logic();
            render();
            refresh();
        }
        shutdown();
        System.exit(0);
    }

    private static void setUpStates() {
        glEnable(GL_BLEND);
        glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
        glClearColor(0.2f, 0.2f, 0.2f, 1);
    }

    private static void setUpDisplay() {
        try {
            Display.setDisplayMode(new DisplayMode(640, 480));
            Display.setTitle("Particle System");
            Display.create();
        } catch (LWJGLException e) {
            e.printStackTrace();
            Display.destroy();
            System.exit(1);
        }
    }

    private static void logic() {
        particleEmitter.update();
    }

    private static void input() {
        particleEmitter.setLocation(new Vector3f(Mouse.getX(), Mouse.getY(), 0));
    }

    private static void render() {
        glClear(GL_COLOR_BUFFER_BIT);
        particleEmitter.draw();
    }

    private static void refresh() {
        Display.sync(60);
        Display.update();
    }

    private static void shutdown() {
        Display.destroy();
    }
}
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