/*
 * (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 * Unpublished-- rights reserved under the copyright laws of the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.
 */
/*  bezmesh.c
 *  This program renders a wireframe Bezier surface,
 *  using two-dimensional evaluators.
 */

#include <windows.h>

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

GLfloat pts[4][4][3] = { 
  { {-1.5,-1.5,4.0},{-0.5,-1.5,2.0}, 
    {0.5,-1.5,-1.0},{1.5,-1.5,2.0} }, 
  { {-1.5,-0.5,1.0},{-0.5,-0.5,3.0}, 
    {0.5,-0.5,0.0},{1.5,-0.5,-1.0} }, 
  { {-1.5,0.5,4.0},{-0.5,0.5,0.0}, 
    {0.5,0.5,3.0},{1.5,0.5,4.0} }, 
  { {-1.5,1.5,-2.0},{-0.5,1.5,-2.0}, 
    {0.5,1.5,0.0},{1.5,1.5,-1.0} } }; 
  
void CALLBACK display(void) { 
  int i,j; 
  glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT); 
  glColor3f(1.0F,1.0F,1.0F); 
  glPushMatrix(); 
  glRotatef(85.0F,1.0F,1.0F,1.0F); 
  for( j = 0 ; j <= 8 ; j++ ) { 
    glBegin(GL_LINE_STRIP); 
    for( i = 0 ; i <= 30 ; i++ ) 
      glEvalCoord2f((float)i/30.0F,(float)j/8.0F); 
    glEnd(); 
    glBegin(GL_LINE_STRIP); 
    for(i = 0; i <= 30; i++) 
      glEvalCoord2f((float)j/8.0F,(float)i/30.0F); 
    glEnd(); } 
  glPopMatrix(); 
  glFlush(); 
} 
  
void myinit(void) { 
  glClearColor(0.0,0.0,0.0,1.0); 
  glMap2f(GL_MAP2_VERTEX_3,0,1,3,4,0,1,12,4,&pts[0][0][0]); 
  glEnable(GL_MAP2_VERTEX_3); 
  glMapGrid2f(20,0.0,1.0,20,0.0,1.0); 
  glEnable(GL_DEPTH_TEST); 
  glShadeModel(GL_FLAT); 
} 
  
void CALLBACK myReshape(int w,int h) { 
  glViewport(0,0,w,h); 
  glMatrixMode(GL_PROJECTION); 
  glLoadIdentity(); 
  if ( w <= h ) 
    glOrtho(-3.2,3.2,-3.2*(float)h/(float)w,3.2*(float)h/(float)w,-4.0,4.0); 
    else 
    glOrtho(-3.2*(float)w/(float)h,3.2*(float)w/(float)h,-3.2,3.2,-4.0,4.0); 
  glMatrixMode(GL_MODELVIEW); 
  glLoadIdentity(); 
} 
  
void main(void) { 
  auxInitDisplayMode(AUX_SINGLE|AUX_RGB|AUX_DEPTH); 
  auxInitPosition(0,0,300,230); 
  auxInitWindow("Maillage de Bézier"); 
  myinit(); 
  auxReshapeFunc(myReshape); 
  auxMainLoop(display); 
}