progs/redbook/nurbs.c

   1
   2 /* Copyright (c) Mark J. Kilgard, 1994. */
   3
   4 /*
   5  * (c) Copyright 1993, Silicon Graphics, Inc.
   6  * ALL RIGHTS RESERVED
   7  * Permission to use, copy, modify, and distribute this software for
   8  * any purpose and without fee is hereby granted, provided that the above
   9  * copyright notice appear in all copies and that both the copyright notice
  10  * and this permission notice appear in supporting documentation, and that
  11  * the name of Silicon Graphics, Inc. not be used in advertising
  12  * or publicity pertaining to distribution of the software without specific,
  13  * written prior permission.
  14  *
  15  * THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS"
  16  * AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE,
  17  * INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR
  18  * FITNESS FOR A PARTICULAR PURPOSE.  IN NO EVENT SHALL SILICON
  19  * GRAPHICS, INC.  BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT,
  20  * SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY
  21  * KIND, OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION,
  22  * LOSS OF PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF
  23  * THIRD PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC.  HAS BEEN
  24  * ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON
  25  * ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE
  26  * POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE.
  27  *
  28  * US Government Users Restricted Rights
  29  * Use, duplication, or disclosure by the Government is subject to
  30  * restrictions set forth in FAR 52.227.19(c)(2) or subparagraph
  31  * (c)(1)(ii) of the Rights in Technical Data and Computer Software
  32  * clause at DFARS 252.227-7013 and/or in similar or successor
  33  * clauses in the FAR or the DOD or NASA FAR Supplement.
  34  * Unpublished-- rights reserved under the copyright laws of the
  35  * United States.  Contractor/manufacturer is Silicon Graphics,
  36  * Inc., 2011 N.  Shoreline Blvd., Mountain View, CA 94039-7311.
  37  *
  38  * OpenGL(TM) is a trademark of Silicon Graphics, Inc.
  39  */
  40 /*
  41  *  nurbs.c
  42  *  This program shows a NURBS (Non-uniform rational B-splines)
  43  *  surface, shaped like a heart.
  44  */
  45 #include <stdlib.h>
  46 #include <GL/glut.h>
  47
  48 #define S_NUMPOINTS 13
  49 #define S_ORDER     3
  50 #define S_NUMKNOTS  (S_NUMPOINTS + S_ORDER)
  51 #define T_NUMPOINTS 3
  52 #define T_ORDER     3
  53 #define T_NUMKNOTS  (T_NUMPOINTS + T_ORDER)
  54 #define SQRT2    1.41421356237309504880
  55
  56 /* initialized local data */
  57
  58 GLfloat sknots[S_NUMKNOTS] =
  59     {-1.0, -1.0, -1.0, 0.0, 1.0, 2.0, 3.0, 4.0,
  60       4.0,  5.0,  6.0, 7.0, 8.0, 9.0, 9.0, 9.0};
  61 GLfloat tknots[T_NUMKNOTS] = {1.0, 1.0, 1.0, 2.0, 2.0, 2.0};
  62
  63 GLfloat ctlpoints[S_NUMPOINTS][T_NUMPOINTS][4] = {
  64 {   {4.,2.,2.,1.},{4.,1.6,2.5,1.},{4.,2.,3.0,1.}    },
  65 {   {5.,4.,2.,1.},{5.,4.,2.5,1.},{5.,4.,3.0,1.} },
  66 {   {6.,5.,2.,1.},{6.,5.,2.5,1.},{6.,5.,3.0,1.} },
  67 {   {SQRT2*6.,SQRT2*6.,SQRT2*2.,SQRT2},
  68     {SQRT2*6.,SQRT2*6.,SQRT2*2.5,SQRT2},
  69     {SQRT2*6.,SQRT2*6.,SQRT2*3.0,SQRT2}  },
  70 {   {5.2,6.7,2.,1.},{5.2,6.7,2.5,1.},{5.2,6.7,3.0,1.}   },
  71 {   {SQRT2*4.,SQRT2*6.,SQRT2*2.,SQRT2},
  72     {SQRT2*4.,SQRT2*6.,SQRT2*2.5,SQRT2},
  73     {SQRT2*4.,SQRT2*6.,SQRT2*3.0,SQRT2}  },
  74 {   {4.,5.2,2.,1.},{4.,4.6,2.5,1.},{4.,5.2,3.0,1.}  },
  75 {   {SQRT2*4.,SQRT2*6.,SQRT2*2.,SQRT2},
  76     {SQRT2*4.,SQRT2*6.,SQRT2*2.5,SQRT2},
  77     {SQRT2*4.,SQRT2*6.,SQRT2*3.0,SQRT2}  },
  78 {   {2.8,6.7,2.,1.},{2.8,6.7,2.5,1.},{2.8,6.7,3.0,1.}   },
  79 {   {SQRT2*2.,SQRT2*6.,SQRT2*2.,SQRT2},
  80     {SQRT2*2.,SQRT2*6.,SQRT2*2.5,SQRT2},
  81     {SQRT2*2.,SQRT2*6.,SQRT2*3.0,SQRT2}  },
  82 {   {2.,5.,2.,1.},{2.,5.,2.5,1.},{2.,5.,3.0,1.} },
  83 {   {3.,4.,2.,1.},{3.,4.,2.5,1.},{3.,4.,3.0,1.} },
  84 {   {4.,2.,2.,1.},{4.,1.6,2.5,1.},{4.,2.,3.0,1.}    }
  85 };
  86
  87 GLUnurbsObj *theNurb;
  88
  89 /*  Initialize material property, light source, lighting model,
  90  *  and depth buffer.
  91  */
  92 static void myinit(void)
  93 {
  94     GLfloat mat_ambient[] = { 1.0, 1.0, 1.0, 1.0 };
  95     GLfloat mat_diffuse[] = { 1.0, 0.2, 1.0, 1.0 };
  96     GLfloat mat_specular[] = { 1.0, 1.0, 1.0, 1.0 };
  97     GLfloat mat_shininess[] = { 50.0 };
  98
  99     GLfloat light0_position[] = { 1.0, 0.1, 1.0, 0.0 };
 100     GLfloat light1_position[] = { -1.0, 0.1, 1.0, 0.0 };
 101
 102     GLfloat lmodel_ambient[] = { 0.3, 0.3, 0.3, 1.0 };
 103
 104     glMaterialfv(GL_FRONT, GL_AMBIENT, mat_ambient);
 105     glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_diffuse);
 106     glMaterialfv(GL_FRONT, GL_SPECULAR, mat_specular);
 107     glMaterialfv(GL_FRONT, GL_SHININESS, mat_shininess);
 108     glLightfv(GL_LIGHT0, GL_POSITION, light0_position);
 109     glLightfv(GL_LIGHT1, GL_POSITION, light1_position);
 110     glLightModelfv(GL_LIGHT_MODEL_AMBIENT, lmodel_ambient);
 111
 112     glEnable(GL_LIGHTING);
 113     glEnable(GL_LIGHT0);
 114     glEnable(GL_LIGHT1);
 115     glDepthFunc(GL_LESS);
 116     glEnable(GL_DEPTH_TEST);
 117     glEnable(GL_AUTO_NORMAL);
 118
 119     theNurb = gluNewNurbsRenderer();
 120
 121     gluNurbsProperty(theNurb, GLU_SAMPLING_TOLERANCE, 25.0);
 122     gluNurbsProperty(theNurb, GLU_DISPLAY_MODE, GLU_FILL);
 123 }
 124
 125 static void display(void)
 126 {
 127     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 128
 129     glPushMatrix();
 130     glTranslatef (4., 4.5, 2.5);
 131     glRotatef (220.0, 1., 0., 0.);
 132     glRotatef (115.0, 0., 1., 0.);
 133     glTranslatef (-4., -4.5, -2.5);
 134
 135     gluBeginSurface(theNurb);
 136     gluNurbsSurface(theNurb,
 137             S_NUMKNOTS, sknots,
 138             T_NUMKNOTS, tknots,
 139             4 * T_NUMPOINTS,
 140             4,
 141             &ctlpoints[0][0][0],
 142             S_ORDER, T_ORDER,
 143             GL_MAP2_VERTEX_4);
 144     gluEndSurface(theNurb);
 145
 146     glPopMatrix();
 147     glFlush();
 148 }
 149
 150 static void myReshape(int w, int h)
 151 {
 152     glViewport(0, 0, w, h);
 153     glMatrixMode(GL_PROJECTION);
 154     glLoadIdentity();
 155     glFrustum(-1.0, 1.0, -1.5, 0.5, 0.8, 10.0);
 156
 157     glMatrixMode(GL_MODELVIEW);
 158     glLoadIdentity();
 159     gluLookAt(7.0,4.5,4.0, 4.5,4.5,2.0, 6.0,-3.0,2.0);
 160 }
 161
 162 static void
 163 key(unsigned char k, int x, int y)
 164 {
 165   switch (k) {
 166   case 27:  /* Escape */
 167     exit(0);
 168     break;
 169   default:
 170     return;
 171   }
 172   glutPostRedisplay();
 173 }
 174
 175 /*  Main Loop
 176  *  Open window with initial window size, title bar,
 177  *  RGBA display mode, and handle input events.
 178  */
 179 int main(int argc, char** argv)
 180 {
 181     glutInit(&argc, argv);
 182     glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH);
 183     glutCreateWindow (argv[0]);
 184     myinit();
 185     glutReshapeFunc (myReshape);
 186     glutDisplayFunc(display);
 187     glutKeyboardFunc(key);
 188     glutMainLoop();
 189     return 0;             /* ANSI C requires main to return int. */
 190 }