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Diffstat (limited to 'progs/redbook/bezmesh.c')
| -rw-r--r-- | progs/redbook/bezmesh.c | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/progs/redbook/bezmesh.c b/progs/redbook/bezmesh.c new file mode 100644 index 00000000000..55e7e827f2b --- /dev/null +++ b/progs/redbook/bezmesh.c @@ -0,0 +1,162 @@ + +/* 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 + * Unpublished-- rights reserved under the copyright laws of the + * United States.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. + */ +/* bezsurf.c + * This program renders a lighted, filled Bezier surface, + * using two-dimensional evaluators. + */ +#include <stdlib.h> +#include <GL/glut.h> + +GLfloat ctrlpoints[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 +initlights(void) +{ + GLfloat ambient[] = + {0.2, 0.2, 0.2, 1.0}; + GLfloat position[] = + {0.0, 0.0, 2.0, 1.0}; + GLfloat mat_diffuse[] = + {0.6, 0.6, 0.6, 1.0}; + GLfloat mat_specular[] = + {1.0, 1.0, 1.0, 1.0}; + GLfloat mat_shininess[] = + {50.0}; + + glEnable(GL_LIGHTING); + glEnable(GL_LIGHT0); + + glLightfv(GL_LIGHT0, GL_AMBIENT, ambient); + glLightfv(GL_LIGHT0, GL_POSITION, position); + + glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_diffuse); + glMaterialfv(GL_FRONT, GL_SPECULAR, mat_specular); + glMaterialfv(GL_FRONT, GL_SHININESS, mat_shininess); +} + +void +display(void) +{ + glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); + glPushMatrix(); + glRotatef(85.0, 1.0, 1.0, 1.0); + glEvalMesh2(GL_FILL, 0, 20, 0, 20); + glPopMatrix(); + glFlush(); +} + +void +myinit(void) +{ + glClearColor(0.0, 0.0, 0.0, 1.0); + glEnable(GL_DEPTH_TEST); + glMap2f(GL_MAP2_VERTEX_3, 0, 1, 3, 4, + 0, 1, 12, 4, &ctrlpoints[0][0][0]); + glEnable(GL_MAP2_VERTEX_3); + glEnable(GL_AUTO_NORMAL); + glEnable(GL_NORMALIZE); + glMapGrid2f(20, 0.0, 1.0, 20, 0.0, 1.0); + initlights(); /* for lighted version only */ +} + +void +myReshape(int w, int h) +{ + glViewport(0, 0, w, h); + glMatrixMode(GL_PROJECTION); + glLoadIdentity(); + if (w <= h) + glOrtho(-4.0, 4.0, -4.0 * (GLfloat) h / (GLfloat) w, + 4.0 * (GLfloat) h / (GLfloat) w, -4.0, 4.0); + else + glOrtho(-4.0 * (GLfloat) w / (GLfloat) h, + 4.0 * (GLfloat) w / (GLfloat) h, -4.0, 4.0, -4.0, 4.0); + glMatrixMode(GL_MODELVIEW); + glLoadIdentity(); +} + +static void +key(unsigned char k, int x, int y) +{ + switch (k) { + case 27: /* Escape */ + exit(0); + break; + default: + return; + } + glutPostRedisplay(); +} + +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. */ +} |