/*
 * material.java
 * This program demonstrates the use of the GL lighting model.
 * Several objects are drawn using different material characteristics.
 * A single light source illuminates the objects.
 */

import java.util.Date;

import jgl.GL;
import jgl.GLApplet;

public class material extends GLApplet {

    /*
     *  Initialize z-buffer, projection matrix, light source, 
     *  and lighting model.  Do not specify a material property here.
     */
    private void myinit () {
	float ambient [] = {0.0f,0.0f,0.0f,1.0f};
	float diffuse [] = {1.0f,1.0f,1.0f,1.0f};
	float specular [] = {1.0f,1.0f,1.0f,1.0f};
	float position [] = {0.0f,3.0f,2.0f,0.0f};
	float lmodel_ambient [] = {0.4f,0.4f,0.4f,1.0f};
	float local_view [] = {0.0f};

	myGL.glEnable (GL.GL_DEPTH_TEST);
	myGL.glDepthFunc (GL.GL_LESS);

	myGL.glLightfv (GL.GL_LIGHT0, GL.GL_AMBIENT, ambient);
	myGL.glLightfv (GL.GL_LIGHT0, GL.GL_DIFFUSE, diffuse);
	myGL.glLightfv (GL.GL_LIGHT0, GL.GL_POSITION, position);
	myGL.glLightModelfv (GL.GL_LIGHT_MODEL_AMBIENT, lmodel_ambient);
	myGL.glLightModelfv (GL.GL_LIGHT_MODEL_LOCAL_VIEWER, local_view);

	myGL.glEnable (GL.GL_LIGHTING);
	myGL.glEnable (GL.GL_LIGHT0);

	myGL.glClearColor (0.0f, 0.1f, 0.1f, 0.0f);
    }

    /*
     *  Draw twelve spheres in 3 rows with 4 columns.  
     *  The spheres in the first row have materials with no ambient reflection.
     *  The second row has materials with significant ambient reflection.
     *  The third row has materials with colored ambient reflection.
     *
     *  The first column has materials with blue, diffuse reflection only.
     *  The second column has blue diffuse reflection, as well as specular
     *  reflection with a low shininess exponent.
     *  The third column has blue diffuse reflection, as well as specular
     *  reflection with a high shininess exponent (a more concentrated highlight).
     *  The fourth column has materials which also include an emissive component.
     *
     *  glTranslatef() is used to move spheres to their appropriate locations.
     */
    public void display () {
	float no_mat[]={0.0f,0.0f,0.0f,1.0f};
	float mat_ambient[]={0.7f,0.7f,0.7f,1.0f};
	float mat_ambient_color[]={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 no_shininess[]={0.0f};
	float low_shininess[]={5.0f};
	float high_shininess[]={100.0f};
	float mat_emission[]={0.3f,0.2f,0.2f,0.0f};

	Date startTime = new Date ();

	myGL.glClear (GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);

	/*
	 *  draw sphere in first row, first column
	 *  diffuse reflection only; no ambient or specular
	 */
	myGL.glPushMatrix ();
	    myGL.glTranslatef (-3.75f, 3.0f, 0.0f);
	    myGL.glMaterialfv (GL.GL_FRONT, GL.GL_AMBIENT, no_mat);
	    myGL.glMaterialfv (GL.GL_FRONT, GL.GL_DIFFUSE, mat_diffuse);
	    myGL.glMaterialfv (GL.GL_FRONT, GL.GL_SPECULAR, no_mat);
	    myGL.glMaterialfv (GL.GL_FRONT, GL.GL_SHININESS, no_shininess);
	    myGL.glMaterialfv (GL.GL_FRONT, GL.GL_EMISSION, no_mat);
	    myUT.glutSolidSphere (1.0, 16, 16);
	myGL.glPopMatrix ();

	/*
	 *  draw sphere in first row, second column
	 *  diffuse and specular reflection; low shininess; no ambient
	 */
	myGL.glPushMatrix ();
	    myGL.glTranslatef (-1.25f, 3.0f, 0.0f);
	    myGL.glMaterialfv (GL.GL_FRONT, GL.GL_AMBIENT, no_mat);
	    myGL.glMaterialfv (GL.GL_FRONT, GL.GL_DIFFUSE, mat_diffuse);
	    myGL.glMaterialfv (GL.GL_FRONT, GL.GL_SPECULAR, mat_specular);
	    myGL.glMaterialfv (GL.GL_FRONT, GL.GL_SHININESS, low_shininess);
	    myGL.glMaterialfv (GL.GL_FRONT, GL.GL_EMISSION, no_mat);
	    myUT.glutSolidSphere (1.0, 16, 16);
	myGL.glPopMatrix ();

	/*
	 *  draw sphere in first row, third column
 	 *  diffuse and specular reflection; high shininess; no ambient
 	 */
	myGL.glPushMatrix ();
	    myGL.glTranslatef (1.25f, 3.0f, 0.0f);
	    myGL.glMaterialfv (GL.GL_FRONT, GL.GL_AMBIENT, no_mat);
	    myGL.glMaterialfv (GL.GL_FRONT, GL.GL_DIFFUSE, mat_diffuse);
	    myGL.glMaterialfv (GL.GL_FRONT, GL.GL_SPECULAR, mat_specular);
	    myGL.glMaterialfv (GL.GL_FRONT, GL.GL_SHININESS, high_shininess);
	    myGL.glMaterialfv (GL.GL_FRONT, GL.GL_EMISSION, no_mat);
	    myUT.glutSolidSphere (1.0, 16, 16);
	myGL.glPopMatrix ();

	/*
	 *  draw sphere in first row, fourth column
	 *  diffuse reflection; emission; no ambient or specular reflection
	 */
	myGL.glPushMatrix ();
	    myGL.glTranslatef (3.75f, 3.0f, 0.0f);
	    myGL.glMaterialfv (GL.GL_FRONT, GL.GL_AMBIENT, no_mat);
	    myGL.glMaterialfv (GL.GL_FRONT, GL.GL_DIFFUSE, mat_diffuse);
	    myGL.glMaterialfv (GL.GL_FRONT, GL.GL_SPECULAR, no_mat);
	    myGL.glMaterialfv (GL.GL_FRONT, GL.GL_SHININESS, no_shininess);
	    myGL.glMaterialfv (GL.GL_FRONT, GL.GL_EMISSION, mat_emission);
	    myUT.glutSolidSphere (1.0, 16, 16);
	myGL.glPopMatrix ();

	/*
	 *  draw sphere in second row, first column
	 *  ambient and diffuse reflection; no specular
	 */
	myGL.glPushMatrix ();
	    myGL.glTranslatef (-3.75f, 0.0f, 0.0f);
	    myGL.glMaterialfv (GL.GL_FRONT, GL.GL_AMBIENT, mat_ambient);
	    myGL.glMaterialfv (GL.GL_FRONT, GL.GL_DIFFUSE, mat_diffuse);
	    myGL.glMaterialfv (GL.GL_FRONT, GL.GL_SPECULAR, no_mat);
	    myGL.glMaterialfv (GL.GL_FRONT, GL.GL_SHININESS, no_shininess);
	    myGL.glMaterialfv (GL.GL_FRONT, GL.GL_EMISSION, no_mat);
	    myUT.glutSolidSphere (1.0, 16, 16);
	myGL.glPopMatrix ();

	/*
	 *  draw sphere in second row, second column
	 *  ambient, diffuse and specular reflection; low shininess
	 */
	myGL.glPushMatrix ();
	    myGL.glTranslatef (-1.25f, 0.0f, 0.0f);
	    myGL.glMaterialfv (GL.GL_FRONT, GL.GL_AMBIENT, mat_ambient);
	    myGL.glMaterialfv (GL.GL_FRONT, GL.GL_DIFFUSE, mat_diffuse);
	    myGL.glMaterialfv (GL.GL_FRONT, GL.GL_SPECULAR, mat_specular);
	    myGL.glMaterialfv (GL.GL_FRONT, GL.GL_SHININESS, low_shininess);
	    myGL.glMaterialfv (GL.GL_FRONT, GL.GL_EMISSION, no_mat);
	    myUT.glutSolidSphere (1.0, 16, 16);
	myGL.glPopMatrix ();

	/*
	 *  draw sphere in second row, third column
	 *  ambient, diffuse and specular reflection; high shininess
	 */
	myGL.glPushMatrix ();
	    myGL.glTranslatef (1.25f, 0.0f, 0.0f);
	    myGL.glMaterialfv (GL.GL_FRONT, GL.GL_AMBIENT, mat_ambient);
	    myGL.glMaterialfv (GL.GL_FRONT, GL.GL_DIFFUSE, mat_diffuse);
	    myGL.glMaterialfv (GL.GL_FRONT, GL.GL_SPECULAR, mat_specular);
	    myGL.glMaterialfv (GL.GL_FRONT, GL.GL_SHININESS, high_shininess);
	    myGL.glMaterialfv (GL.GL_FRONT, GL.GL_EMISSION, no_mat);
	    myUT.glutSolidSphere (1.0, 16, 16);
	myGL.glPopMatrix ();

	/*
	 *  draw sphere in second row, fourth column
	 *  ambient and diffuse reflection; emission; no specular
	 */
	myGL.glPushMatrix (); 
	    myGL.glTranslatef (3.75f, 0.0f, 0.0f);
	    myGL.glMaterialfv (GL.GL_FRONT, GL.GL_AMBIENT, mat_ambient);
	    myGL.glMaterialfv (GL.GL_FRONT, GL.GL_DIFFUSE, mat_diffuse);
	    myGL.glMaterialfv (GL.GL_FRONT, GL.GL_SPECULAR, no_mat);
	    myGL.glMaterialfv (GL.GL_FRONT, GL.GL_SHININESS, no_shininess);
	    myGL.glMaterialfv (GL.GL_FRONT, GL.GL_EMISSION, mat_emission);
	    myUT.glutSolidSphere (1.0, 16, 16);
	myGL.glPopMatrix ();

	/*
	 *  draw sphere in third row, first column
	 *  colored ambient and diffuse reflection; no specular
	 */
	myGL.glPushMatrix ();
	    myGL.glTranslatef (-3.75f, -3.0f, 0.0f);
	    myGL.glMaterialfv (GL.GL_FRONT, GL.GL_AMBIENT, mat_ambient_color);
	    myGL.glMaterialfv (GL.GL_FRONT, GL.GL_DIFFUSE, mat_diffuse);
	    myGL.glMaterialfv (GL.GL_FRONT, GL.GL_SPECULAR, no_mat);
	    myGL.glMaterialfv (GL.GL_FRONT, GL.GL_SHININESS, no_shininess);
	    myGL.glMaterialfv (GL.GL_FRONT, GL.GL_EMISSION, no_mat);
	    myUT.glutSolidSphere (1.0, 16, 16);
	myGL.glPopMatrix ();

	/*
	 *  draw sphere in third row, second column
	 *  colored ambient, diffuse and specular reflection; low shininess
	 */
	myGL.glPushMatrix ();
	    myGL.glTranslatef (-1.25f, -3.0f, 0.0f);
	    myGL.glMaterialfv (GL.GL_FRONT, GL.GL_AMBIENT, mat_ambient_color);
	    myGL.glMaterialfv (GL.GL_FRONT, GL.GL_DIFFUSE, mat_diffuse);
	    myGL.glMaterialfv (GL.GL_FRONT, GL.GL_SPECULAR, mat_specular);
	    myGL.glMaterialfv (GL.GL_FRONT, GL.GL_SHININESS, low_shininess);
	    myGL.glMaterialfv (GL.GL_FRONT, GL.GL_EMISSION, no_mat);
	    myUT.glutSolidSphere (1.0, 16, 16);
	myGL.glPopMatrix ();

	/*
	 *  draw sphere in third row, third column
	 *  colored ambient, diffuse and specular reflection; high shininess
	 */
	myGL.glPushMatrix ();
	    myGL.glTranslatef (1.25f, -3.0f, 0.0f);
	    myGL.glMaterialfv (GL.GL_FRONT, GL.GL_AMBIENT, mat_ambient_color);
	    myGL.glMaterialfv (GL.GL_FRONT, GL.GL_DIFFUSE, mat_diffuse);
	    myGL.glMaterialfv (GL.GL_FRONT, GL.GL_SPECULAR, mat_specular);
	    myGL.glMaterialfv (GL.GL_FRONT, GL.GL_SHININESS, high_shininess);
	    myGL.glMaterialfv (GL.GL_FRONT, GL.GL_EMISSION, no_mat);
	    myUT.glutSolidSphere (1.0, 16, 16);
	myGL.glPopMatrix ();

	/*
	 *  draw sphere in third row, fourth column
	 *  colored ambient and diffuse reflection; emission; no specular
	 */
	myGL.glPushMatrix ();
	    myGL.glTranslatef (3.75f, -3.0f, 0.0f);
	    myGL.glMaterialfv (GL.GL_FRONT, GL.GL_AMBIENT, mat_ambient_color);
	    myGL.glMaterialfv (GL.GL_FRONT, GL.GL_DIFFUSE, mat_diffuse);
	    myGL.glMaterialfv (GL.GL_FRONT, GL.GL_SPECULAR, no_mat);
	    myGL.glMaterialfv (GL.GL_FRONT, GL.GL_SHININESS, no_shininess);
	    myGL.glMaterialfv (GL.GL_FRONT, GL.GL_EMISSION, mat_emission);
	    myUT.glutSolidSphere (1.0, 16, 16);
	myGL.glPopMatrix ();

	myGL.glFlush ();

	Date endTime = new Date ();
//	System.out.println ("Run Time : " + (endTime.getTime () - startTime.getTime ()) + " ms");
//	System.out.println ((endTime.getTime () - startTime.getTime ()));
    }

    public void rotateDisplay () {
	myUT.glutPostRedisplay ();
    }

    public void myReshape (int w, int h) {
        myGL.glViewport (0, 0, w, h);
        myGL.glMatrixMode (GL.GL_PROJECTION);
        myGL.glLoadIdentity ();
	if (w <= (h * 2)) {
	    myGL.glOrtho (-6.0f,  6.0f,
			  -3.0f * ((float)h * 2) / (float)w,
			   3.0f * ((float)h * 2) / (float)w,
			 -10.0f, 10.0f);
	} else {
            myGL.glOrtho (-6.0f * (float)w / ((float)h * 2),
            		   6.0f * (float)w / ((float)h * 2),
			  -3.0f,  3.0f,
			 -10.0f, 10.0f);
	}
        myGL.glMatrixMode (GL.GL_MODELVIEW);
    }

    /*
     *  Main Loop
     *  Open window with initial window size, title bar, 
     *  RGBA display mode, and handle input events.
     */
    public void init () {
	myUT.glutInitWindowSize (600, 450);
	myUT.glutInitWindowPosition (0, 0);
	myUT.glutCreateWindow (this);
	myinit ();
	myUT.glutReshapeFunc ("myReshape");
	myUT.glutDisplayFunc ("display");
	myUT.glutMainLoop ();
	myUT.glutIdleFunc ("rotateDisplay");
    }

}