/*
 * Copyright (c) 1993-2003, Silicon Graphics, Inc.
 * All Rights Reserved
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose and without fee is hereby granted, provided that the above
 * copyright notice appear in all copies and that both the copyright
 * notice and this permission notice appear in supporting documentation,
 * and that the name of Silicon Graphics, Inc. not be used in
 * advertising or publicity pertaining to distribution of the software
 * without specific, written prior permission.
 *
 * THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS" AND
 * WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR
 * FITNESS FOR A PARTICULAR PURPOSE.  IN NO EVENT SHALL SILICON
 * GRAPHICS, INC.  BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT,
 * SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
 * OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION, LOSS OF
 * PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF THIRD
 * PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC.  HAS BEEN ADVISED OF
 * THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE POSSESSION, USE
 * OR PERFORMANCE OF THIS SOFTWARE.
 *
 * US Government Users Restricted Rights 
 * Use, duplication, or disclosure by the Government is subject to
 * restrictions set forth in FAR 52.227.19(c)(2) or subparagraph
 * (c)(1)(ii) of the Rights in Technical Data and Computer Software
 * clause at DFARS 252.227-7013 and/or in similar or successor clauses
 * in the FAR or the DOD or NASA FAR Supplement.  Unpublished - rights
 * reserved under the copyright laws of the United States.
 *
 * Contractor/manufacturer is:
 *	Silicon Graphics, Inc.
 *	1500 Crittenden Lane
 *	Mountain View, CA  94043
 *	United State of America
 *
 * OpenGL(R) is a registered trademark of Silicon Graphics, Inc.
 */

/*
 *  double.c
 *  This is a simple double buffered program.
 *  Pressing the left mouse button rotates the rectangle.
 *  Pressing the middle mouse button stops the rotation.
 */
#include <GL/freeglut.h>
#include <stdlib.h>

static GLfloat spin = 0.0;
GLfloat mat[16];

void print_mat(){
  int i;
  printf("--------------------------\n");
  printf("spin=%e\n",spin);
    for (i=0;i<4;i++) printf("%e %e %e %e \n",mat[i],mat[i+4],mat[i+8],mat[i+12]);
}
void draw_pic(void){
   glClear(GL_COLOR_BUFFER_BIT);
   glMatrixMode(GL_MODELVIEW);
   glPushMatrix();
   glRotatef(spin, 0.0, 0.0, 0.0);
   glTranslatef(0.0,0.0,5.0);
   glGetFloatv(GL_MODELVIEW_MATRIX,mat);
   print_mat();
   glPolygonMode(GL_FRONT_AND_BACK,GL_LINE);
   glColor3f(1.0, 0.0, 0.0);
   //   glRectf(-25.0, -25.0, 25.0, 25.0);
   glBegin(GL_POLYGON);
    glVertex2f(-25.0,-25.0);
    glVertex2f(25.0, -25.0);
    glVertex2f(25.0, 25.0);
    glVertex2f(-25.0, 25.0);
   glEnd();
   glPolygonMode(GL_FRONT,GL_FILL);
   glColor3f(1.0, 1.0, 0.0);
   //   glRectf(-25.0, -25.0, 25.0, 25.0);
   glBegin(GL_POLYGON);
    glVertex2f(-25.0,-25.0);
    glVertex2f(25.0, -25.0);
    glVertex2f(25.0, 25.0);
    glVertex2f(-25.0, 25.0);
   glEnd();
   glColor3f(0.0, 1.0, 1.0);
   glPolygonMode(GL_FRONT,GL_FILL);
   glBegin(GL_POLYGON);
    glVertex2f(-25.0,-25.0);
    glVertex2f(-25.0, 25.0);
    glVertex2f(25.0, 25.0);
    glVertex2f(25.0, -25.0);
   glEnd();
   glPopMatrix();
}

void display(void)
{
  draw_pic();
  glutSwapBuffers();
}

void spinDisplay(void)
{
   spin = spin + 1.0;
   if (spin > 360.0)
      spin = spin - 360.0;
   glutPostRedisplay();
   usleep(900);
}

void init(void) 
{
   glClearColor (1.0,1.0, 1.0, 0.0);
   glShadeModel (GL_SMOOTH);
}

void reshape(int w, int h)
{
   glViewport (0, 0, (GLsizei) w, (GLsizei) h);
   glMatrixMode(GL_PROJECTION);
   glLoadIdentity();
   glOrtho(-50.0, 50.0, -50.0, 50.0, -50.0, 50.0);
   glMatrixMode(GL_MODELVIEW);
   glLoadIdentity();
}

void mouse(int button, int state, int x, int y) 
{
   switch (button) {
      case GLUT_LEFT_BUTTON:
         if (state == GLUT_DOWN)
            glutIdleFunc(spinDisplay);
         break;
      case GLUT_MIDDLE_BUTTON:
      case GLUT_RIGHT_BUTTON:
         if (state == GLUT_DOWN)
            glutIdleFunc(NULL);
         break;
      default:
         break;
   }
}
   
/* 
 *  Request double buffer display mode.
 *  Register mouse input callback functions
 */
int main(int argc, char** argv)
{
   glutInit(&argc, argv);
   glutInitDisplayMode (GLUT_DOUBLE | GLUT_RGB);
   glutInitWindowSize (250, 250); 
   glutInitWindowPosition (100, 100);
   glutCreateWindow (argv[0]);
   init ();
   glutDisplayFunc(display); 
   glutReshapeFunc(reshape); 
   glutMouseFunc(mouse);
   glutMainLoop();
   return 0;   /* ANSI C requires main to return int. */
}