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Diffstat (limited to 'progs/redbook/nurbs.c')
| -rw-r--r-- | progs/redbook/nurbs.c | 190 |
1 files changed, 190 insertions, 0 deletions
diff --git a/progs/redbook/nurbs.c b/progs/redbook/nurbs.c new file mode 100644 index 00000000000..a7c6f0c696e --- /dev/null +++ b/progs/redbook/nurbs.c @@ -0,0 +1,190 @@ + +/* Copyright (c) Mark J. Kilgard, 1994. */ + +/* + * (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 + * Unpublished-- rights reserved under the copyright laws of the + * United States.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. + */ +/* + * nurbs.c + * This program shows a NURBS (Non-uniform rational B-splines) + * surface, shaped like a heart. + */ +#include <stdlib.h> +#include <GL/glut.h> + +#define S_NUMPOINTS 13 +#define S_ORDER 3 +#define S_NUMKNOTS (S_NUMPOINTS + S_ORDER) +#define T_NUMPOINTS 3 +#define T_ORDER 3 +#define T_NUMKNOTS (T_NUMPOINTS + T_ORDER) +#define SQRT2 1.41421356237309504880 + +/* initialized local data */ + +GLfloat sknots[S_NUMKNOTS] = + {-1.0, -1.0, -1.0, 0.0, 1.0, 2.0, 3.0, 4.0, + 4.0, 5.0, 6.0, 7.0, 8.0, 9.0, 9.0, 9.0}; +GLfloat tknots[T_NUMKNOTS] = {1.0, 1.0, 1.0, 2.0, 2.0, 2.0}; + +GLfloat ctlpoints[S_NUMPOINTS][T_NUMPOINTS][4] = { +{ {4.,2.,2.,1.},{4.,1.6,2.5,1.},{4.,2.,3.0,1.} }, +{ {5.,4.,2.,1.},{5.,4.,2.5,1.},{5.,4.,3.0,1.} }, +{ {6.,5.,2.,1.},{6.,5.,2.5,1.},{6.,5.,3.0,1.} }, +{ {SQRT2*6.,SQRT2*6.,SQRT2*2.,SQRT2}, + {SQRT2*6.,SQRT2*6.,SQRT2*2.5,SQRT2}, + {SQRT2*6.,SQRT2*6.,SQRT2*3.0,SQRT2} }, +{ {5.2,6.7,2.,1.},{5.2,6.7,2.5,1.},{5.2,6.7,3.0,1.} }, +{ {SQRT2*4.,SQRT2*6.,SQRT2*2.,SQRT2}, + {SQRT2*4.,SQRT2*6.,SQRT2*2.5,SQRT2}, + {SQRT2*4.,SQRT2*6.,SQRT2*3.0,SQRT2} }, +{ {4.,5.2,2.,1.},{4.,4.6,2.5,1.},{4.,5.2,3.0,1.} }, +{ {SQRT2*4.,SQRT2*6.,SQRT2*2.,SQRT2}, + {SQRT2*4.,SQRT2*6.,SQRT2*2.5,SQRT2}, + {SQRT2*4.,SQRT2*6.,SQRT2*3.0,SQRT2} }, +{ {2.8,6.7,2.,1.},{2.8,6.7,2.5,1.},{2.8,6.7,3.0,1.} }, +{ {SQRT2*2.,SQRT2*6.,SQRT2*2.,SQRT2}, + {SQRT2*2.,SQRT2*6.,SQRT2*2.5,SQRT2}, + {SQRT2*2.,SQRT2*6.,SQRT2*3.0,SQRT2} }, +{ {2.,5.,2.,1.},{2.,5.,2.5,1.},{2.,5.,3.0,1.} }, +{ {3.,4.,2.,1.},{3.,4.,2.5,1.},{3.,4.,3.0,1.} }, +{ {4.,2.,2.,1.},{4.,1.6,2.5,1.},{4.,2.,3.0,1.} } +}; + +GLUnurbsObj *theNurb; + +/* Initialize material property, light source, lighting model, + * and depth buffer. + */ +void myinit(void) +{ + GLfloat mat_ambient[] = { 1.0, 1.0, 1.0, 1.0 }; + GLfloat mat_diffuse[] = { 1.0, 0.2, 1.0, 1.0 }; + GLfloat mat_specular[] = { 1.0, 1.0, 1.0, 1.0 }; + GLfloat mat_shininess[] = { 50.0 }; + + GLfloat light0_position[] = { 1.0, 0.1, 1.0, 0.0 }; + GLfloat light1_position[] = { -1.0, 0.1, 1.0, 0.0 }; + + GLfloat lmodel_ambient[] = { 0.3, 0.3, 0.3, 1.0 }; + + glMaterialfv(GL_FRONT, GL_AMBIENT, mat_ambient); + glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_diffuse); + glMaterialfv(GL_FRONT, GL_SPECULAR, mat_specular); + glMaterialfv(GL_FRONT, GL_SHININESS, mat_shininess); + glLightfv(GL_LIGHT0, GL_POSITION, light0_position); + glLightfv(GL_LIGHT1, GL_POSITION, light1_position); + glLightModelfv(GL_LIGHT_MODEL_AMBIENT, lmodel_ambient); + + glEnable(GL_LIGHTING); + glEnable(GL_LIGHT0); + glEnable(GL_LIGHT1); + glDepthFunc(GL_LESS); + glEnable(GL_DEPTH_TEST); + glEnable(GL_AUTO_NORMAL); + + theNurb = gluNewNurbsRenderer(); + + gluNurbsProperty(theNurb, GLU_SAMPLING_TOLERANCE, 25.0); + gluNurbsProperty(theNurb, GLU_DISPLAY_MODE, GLU_FILL); +} + +void display(void) +{ + glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); + + glPushMatrix(); + glTranslatef (4., 4.5, 2.5); + glRotatef (220.0, 1., 0., 0.); + glRotatef (115.0, 0., 1., 0.); + glTranslatef (-4., -4.5, -2.5); + + gluBeginSurface(theNurb); + gluNurbsSurface(theNurb, + S_NUMKNOTS, sknots, + T_NUMKNOTS, tknots, + 4 * T_NUMPOINTS, + 4, + &ctlpoints[0][0][0], + S_ORDER, T_ORDER, + GL_MAP2_VERTEX_4); + gluEndSurface(theNurb); + + glPopMatrix(); + glFlush(); +} + +void myReshape(int w, int h) +{ + glViewport(0, 0, w, h); + glMatrixMode(GL_PROJECTION); + glLoadIdentity(); + glFrustum(-1.0, 1.0, -1.5, 0.5, 0.8, 10.0); + + glMatrixMode(GL_MODELVIEW); + glLoadIdentity(); + gluLookAt(7.0,4.5,4.0, 4.5,4.5,2.0, 6.0,-3.0,2.0); +} + +static void +key(unsigned char k, int x, int y) +{ + switch (k) { + case 27: /* Escape */ + exit(0); + break; + default: + return; + } + glutPostRedisplay(); +} + +/* Main Loop + * Open window with initial window size, title bar, + * RGBA display mode, and handle input events. + */ +int main(int argc, char** argv) +{ + glutInit(&argc, argv); + glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH); + glutCreateWindow (argv[0]); + myinit(); + glutReshapeFunc (myReshape); + glutDisplayFunc(display); + glutKeyboardFunc(key); + glutMainLoop(); + return 0; /* ANSI C requires main to return int. */ +} |