/*
 * (c) Copyright 1993, 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 * Unpublished-- rights reserved under the copyright laws of the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., 2011 N.  Shoreline Blvd., Mountain View, CA 94039-7311.
 *
 * OpenGL(TM) is a trademark of Silicon Graphics, Inc.
 */
/*
 *  surface.c
 *  This program draws a NURBS surface in the shape of a 
 *  symmetrical hill.
 */

#include <math.h>

#include <GL/glut.h>
#include <GL/gl.h>
#include <GL/glu.h>

#include "ModuleCouleurs.h"
#include "ModuleManipulateur.h"
#include "ModuleMenus.h"
#include "ModuleReshape.h"

static GLfloat ctlpoints[4][4][3]; 

static float z = 3.0F;  
static float dz = -0.1F;  

void idle(void) {
  z += dz;
  if ( z < -18.0F )
    dz = -dz;
  if ( z > 18.0F )
    dz = -dz;
  glutPostRedisplay();
  }

void init_surface(void) { 
  int u,v; 
  for( u = 0 ; u < 4 ; u++ ) { 
    for( v = 0 ; v < 4 ; v++ ) { 
      ctlpoints[u][v][0] = 3.0F*(u-1.5F); 
      ctlpoints[u][v][1] = 2.0F*(v-1.5F); 
      if ((u==1 || u==2)&&(v==1 || v==2)) 
        ctlpoints[u][v][2] = z; 
        else 
        ctlpoints[u][v][2] = 0.0F; } } 
  } 
  
void display(void) { 
  GLUnurbsObj *theNurb; 
  GLfloat knots[8] = {0.0,0.0,0.0,0.0,1.0,1.0,1.0,1.0}; 
  init_surface(); 
  theNurb = gluNewNurbsRenderer(); 
  gluNurbsProperty(theNurb,GLU_SAMPLING_TOLERANCE,25.0); 
  gluNurbsProperty(theNurb,GLU_DISPLAY_MODE,GLU_FILL); 
  glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT); 
  glPushMatrix();
  manipulateurSouris();
  manipulateurClavier();
  glTranslatef(0.0F,0.0F,0.0F) ;
  glRotatef(330.0,1.,0.,0.); 
  glScalef(0.5,0.5,0.5); 
  gluBeginSurface(theNurb); 
  gluNurbsSurface(theNurb,8,knots,8,knots,12,3,&ctlpoints[0][0][0],4,4,GL_MAP2_VERTEX_3); 
  gluEndSurface(theNurb); 
  glPopMatrix(); 
  glFlush();
  glutSwapBuffers();
} 
  
void myinit(void) { 
  GLfloat shininess[] = { 100.0F }; 
  glClearColor(0.9F,0.8F,0.6F,1.0F); 
  glMaterialfv(GL_FRONT,GL_DIFFUSE,couleurGrisClair()); 
  glMaterialfv(GL_FRONT,GL_SPECULAR,couleurBlanc()); 
  glMaterialfv(GL_FRONT,GL_SHININESS,shininess); 
  glEnable(GL_LIGHTING); 
  glEnable(GL_LIGHT0); 
  glDepthFunc(GL_LESS); 
  glEnable(GL_DEPTH_TEST); 
  glEnable(GL_AUTO_NORMAL); 
  glEnable(GL_NORMALIZE); 
} 
  
int main(int argc,char **argv) {
  glutInit(&argc,argv);
  glutInitDisplayMode(GLUT_RGBA|GLUT_DEPTH|GLUT_DOUBLE);
  glutInitWindowSize(300,230); 
  glutInitWindowPosition(50,50); 
  glutCreateWindow("Animation d'une NURB"); 
  myinit(); 
  creationMenuBasique();
  setParametresOrthoBasique(-3.0,3.0,-3.0,3.0,-10.0,10.0);
  setManipulateurDistance(1.0F);
  setManipulateurClavierAngle(15.0F,40.0F,0.0F) ;
  glutReshapeFunc(reshapeOrthoBasique);
  glutKeyboardFunc(keyBasique);
  glutSpecialFunc(specialBasique);
  glutMotionFunc(motionBasique);
  glutMouseFunc(sourisBasique);
  glutIdleFunc(idle);
  glutDisplayFunc(display);
  glutMainLoop();
  return(0);
}