JOGL로 한 그래픽스 실습 <Lighitng>

import java.awt.*;
import java.awt.event.*;

import com.sun.opengl.util.Animator;
import javax.media.opengl.GL;
import javax.media.opengl.glu.GLU;
import javax.media.opengl.GLCanvas;
import javax.media.opengl.GLCapabilities;
import javax.media.opengl.GLAutoDrawable;
import javax.media.opengl.GLEventListener;

public class Lighting extends Frame
        implements GLEventListener, KeyListener {

    public void keyPressed(KeyEvent e) {
        if (e.getKeyCode() == KeyEvent.VK_ESCAPE) {
            System.exit(0);
        }
    }
    public void keyReleased(KeyEvent e) {
    }

    public void keyTyped(KeyEvent e) {
    }
    public Lighting() {
        super("Lighting and Shading");
        setLayout(new BorderLayout());
        setSize(400, 400);
        setLocation(40, 40);
        setVisible(true);
        setupJOGL();
    }

    /**
     * Called by the drawable immediately after the OpenGL context is
     * initialized; the GLContext has already been made current when
     * this method is called.
     *
     * @param drawable The display context to render to
     */
    public void init(GLAutoDrawable drawable) {
        GL gl = drawable.getGL();

        gl.glClearColor(1, 1, 1, 1);
        gl.glEnable(GL.GL_DEPTH_TEST);
        float light0_ambient[] = {0.0f, 0.0f, 0.0f, 1.0f};
        float light0_diffuse[] = {0.4f, 0.6f, 0.0f, 1.0f};
        float light0_specular[] = {1.0f, 1.0f, 1.0f, 1.0f};
        float light0_position[] = {1.0f, 1.0f, 1.0f, 0.0f};
        gl.glLightfv(GL.GL_LIGHT0, GL.GL_AMBIENT, light0_ambient, 0);
        gl.glLightfv(GL.GL_LIGHT0, GL.GL_DIFFUSE, light0_diffuse, 0);
        gl.glLightfv(GL.GL_LIGHT0, GL.GL_SPECULAR, light0_specular, 0);
        gl.glLightfv(GL.GL_LIGHT0, GL.GL_POSITION, light0_position, 0);
        gl.glEnable(GL.GL_LIGHTING);
        gl.glEnable(GL.GL_LIGHT0);

        float mat_ambient[] = {0.8f, 0.8f, 0.2f, 1.0f};
        float mat_diffuse[] = {0.1f, 0.5f, 0.8f, 1.0f};
        float mat_specular[] = {1.0f, 1.0f, 1.0f, 1.0f};
        float mat_emission[] = {0.0f, 0.0f, 0.0f, 1.0f};
        float mat_shininess = 50.0f;
        gl.glLightfv(GL.GL_FRONT, GL.GL_AMBIENT, mat_ambient, 0);
        gl.glLightfv(GL.GL_FRONT, GL.GL_DIFFUSE, mat_diffuse, 0);
        gl.glLightfv(GL.GL_FRONT, GL.GL_SPECULAR, mat_specular, 0);
        gl.glLightfv(GL.GL_FRONT, GL.GL_EMISSION, mat_emission, 0);
        gl.glLightf(GL.GL_FRONT, GL.GL_SHININESS, mat_shininess);

        drawable.addKeyListener(this);
    }

    /**
     * Called by the drawable when the surface resizes itself. Used to
     * reset the viewport dimensions.
     *
     * @param drawable The display context to render to
     */
    public void reshape(GLAutoDrawable drawable,
            int x,
            int y,
            int width,
            int height) {
    }

    /**
     * Called by the drawable when the display mode or the display device
     * associated with the GLDrawable has changed
     */
    public void displayChanged(GLAutoDrawable drawable,
            boolean modeChanged,
            boolean deviceChanged) {
    }

    /**
     * Called by the drawable to perform rendering by the client.
     *
     * @param drawable The display context to render to
     */
    public void display(GLAutoDrawable drawable) {
        GL gl = drawable.getGL();
        GLU glu = new GLU();

        // clear the frame buffer and the depth buffer
        gl.glClear(GL.GL_COLOR_BUFFER_BIT);
        gl.glClear(GL.GL_DEPTH_BUFFER_BIT);
        // set intrinsic properties of the camera
        gl.glMatrixMode(GL.GL_PROJECTION);
        gl.glLoadIdentity();
        glu.gluPerspective(45.0f, 1.0f, 0.0001, 100000.0);

        // set extrinsic properties of the camera
        gl.glMatrixMode(GL.GL_MODELVIEW);
        gl.glLoadIdentity();
        glu.gluLookAt(3.0f, 3.0f, 3.0f,
                0.0f, 0.0f, 0.0f,
                0.0f, 1.0f, 0.0f);
        gl.glEnable(GL.GL_LIGHTING);
        gl.glEnable(GL.GL_LIGHT0);
        /// draw objects
        draw_cube(drawable);
        // swap buffers (double buffering)
        //glutSwapBuffers();
    }

    public void draw_cube(GLAutoDrawable drawable) {
        // TODO: set a proper normal for each face
        GL gl = drawable.getGL();

        gl.glBegin(GL.GL_QUADS);

        // front
        gl.glNormal3f(0.0f, 0.0f, 1.0f);
        gl.glVertex3f(1.0f, 1.0f, 1.0f);
        gl.glVertex3f(-1.0f, 1.0f, 1.0f);
        gl.glVertex3f(-1.0f, -1.0f, 1.0f);
        gl.glVertex3f(1.0f, -1.0f, 1.0f);

        // back
        gl.glNormal3f(0.0f, 0.0f, -1.0f);
        gl.glVertex3f(1.0f, -1.0f, -1.0f);
        gl.glVertex3f(-1.0f, -1.0f, -1.0f);
        gl.glVertex3f(-1.0f, 1.0f, -1.0f);
        gl.glVertex3f(1.0f, 1.0f, -1.0f);


        // right
        gl.glNormal3f(1.0f, 0.0f, 0.0f);
        gl.glVertex3f(1.0f, 1.0f, 1.0f);
        gl.glVertex3f(1.0f, -1.0f, 1.0f);
        gl.glVertex3f(1.0f, -1.0f, -1.0f);
        gl.glVertex3f(1.0f, 1.0f, -1.0f);

        // left
        gl.glNormal3f(-1.0f, 0.0f, 0.0f);
        gl.glVertex3f(-1.0f, 1.0f, -1.0f);
        gl.glVertex3f(-1.0f, -1.0f, -1.0f);
        gl.glVertex3f(-1.0f, -1.0f, 1.0f);
        gl.glVertex3f(-1.0f, 1.0f, 1.0f);


        // top
        gl.glNormal3f(0.0f, 1.0f, 0.0f);
        gl.glVertex3f(1.0f, 1.0f, 1.0f);
        gl.glVertex3f(1.0f, 1.0f, -1.0f);
        gl.glVertex3f(-1.0f, 1.0f, -1.0f);
        gl.glVertex3f(-1.0f, 1.0f, 1.0f);

        // bottom
        gl.glNormal3f(0.0f, -1.0f, 0.0f);
        gl.glVertex3f(-1.0f, -1.0f, 1.0f);
        gl.glVertex3f(-1.0f, -1.0f, -1.0f);
        gl.glVertex3f(1.0f, -1.0f, -1.0f);
        gl.glVertex3f(1.0f, -1.0f, 1.0f);


        gl.glEnd();
    }

    private void setupJOGL() {
        GLCapabilities caps = new GLCapabilities();
        caps.setDoubleBuffered(true);
        caps.setHardwareAccelerated(true);

        GLCanvas canvas = new GLCanvas(caps);
        canvas.addGLEventListener(this);
        add(canvas, BorderLayout.CENTER);
        Animator anim = new Animator(canvas);
        anim.start();
    }

    public static void main(String[] args) {
        Lighting demo = new Lighting();
        demo.setVisible(true);
    }
}