Star Field

import static org.lwjgl.opengl.GL11.*;
import static org.lwjgl.util.glu.GLU.gluPerspective;

import java.util.ArrayList;
import java.util.List;
import java.util.Random;

import org.lwjgl.LWJGLException;
import org.lwjgl.input.Keyboard;
import org.lwjgl.opengl.Display;
import org.lwjgl.opengl.DisplayMode;

public class StarField {

    public static class Star {

        public static final Random rnd = new Random();

        public static final int SIZE_DIM = 100;

        public static final int NUM_PIZZA_SLICES = 16;

        public static final int SUBDIVISIONS = 16;

        int render;

        float x, y, z, size, half;

        boolean compiled;

        public Star() {
            x = rnd.nextFloat() * SIZE_DIM * 2 - SIZE_DIM;
            y = rnd.nextFloat() * SIZE_DIM * 2 - SIZE_DIM;
            z = -rnd.nextFloat() * SIZE_DIM;
            size = (rnd.nextFloat() + 0.5F) * 2 - 0.5F;
            half = size / 2;
        }

        void render() {
            if (compiled)
                glCallList(render);
            else {
                compiled = true;
                render = glGenLists(1);
                glNewList(render, GL_COMPILE);
                glPushMatrix();
                glTranslatef(x, y, z);
                glScalef(half, half, 1);
                glBegin(GL_TRIANGLE_FAN);
                glVertex2f(0, 0);
                for (int i = 0; i <= NUM_PIZZA_SLICES; i++) {
                    double angle = Math.PI * 2 * i / SUBDIVISIONS;
                    glVertex3f((float) Math.cos(angle), (float) Math.sin(angle), 0);
                }
                glEnd();
                glPopMatrix();
                glEndList();
            }
        }
    }

    public static final int WIDTH = 800;

    public static final int HEIGHT = 600;

    public List<Star> stars = new ArrayList<Star>();

    public StarField() {
        for (int i = 0; i < 500; i++)
            stars.add(new Star());

        try {
            Display.setDisplayMode(new DisplayMode(WIDTH, HEIGHT));
            Display.setTitle("Star Field - GenuineSounds");
            Display.create();
            Display.setVSyncEnabled(true);
            Keyboard.create();
        }
        catch (LWJGLException e) {
            e.printStackTrace();
        }

        glMatrixMode(GL_PROJECTION);
        glLoadIdentity();
        gluPerspective(70, (float) WIDTH / (float) HEIGHT, 0.001F, 1000);
        glMatrixMode(GL_MODELVIEW);

        float cameraX = 0;
        float cameraY = 0;
        float cameraZ = 0;
        float cameraXDelta = 0;
        float cameraYDelta = 0;
        float cameraZDelta = 0;
        float cameraSpeed = 0.05f;

        while (!Display.isCloseRequested()) {
            glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

            glPushMatrix();
            glTranslatef(cameraX, cameraY, cameraZ);

            cameraXDelta *= 0.975;
            cameraYDelta *= 0.975;
            cameraZDelta *= 0.975;

            if (Keyboard.isKeyDown(Keyboard.KEY_RIGHT))
                cameraXDelta -= 0.1f;
            if (Keyboard.isKeyDown(Keyboard.KEY_LEFT))
                cameraXDelta += 0.1f;
            if (Keyboard.isKeyDown(Keyboard.KEY_UP))
                cameraYDelta -= 0.1f;
            if (Keyboard.isKeyDown(Keyboard.KEY_DOWN))
                cameraYDelta += 0.1f;
            if (Keyboard.isKeyDown(Keyboard.KEY_S))
                cameraZDelta -= 0.1f;
            if (Keyboard.isKeyDown(Keyboard.KEY_W))
                cameraZDelta += 0.1f;

            cameraX += cameraSpeed * cameraXDelta;
            cameraY += cameraSpeed * cameraYDelta;
            cameraZ += cameraSpeed * cameraZDelta;

            glShadeModel(GL_SMOOTH);

            glEnable(GL_POINT_SMOOTH);
            glEnable(GL_BLEND);
            glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

            for (Star star : stars)
                star.render();

            glPopMatrix();

            Display.update();
            Display.sync(60);
        }

        Keyboard.destroy();
        Display.destroy();
        System.exit(0);
    }

    public static void main(String[] args) {
        new StarField();
    }

}