home *** CD-ROM | disk | FTP | other *** search
- /*
- * (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- * Unpublished-- rights reserved under the copyright laws of the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 <GL/gl.h>
- #include <GL/glu.h>
- #include <stdlib.h>
- #include "glaux.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 display(void)
- {
- int i, j;
-
- glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
- glColor3f(1.0, 1.0, 1.0);
- glPushMatrix ();
- glRotatef(85.0, 1.0, 1.0, 1.0);
- for (j = 0; j <= 8; j++) {
- glBegin(GL_LINE_STRIP);
- for (i = 0; i <= 30; i++)
- glEvalCoord2f((GLfloat)i/30.0, (GLfloat)j/8.0);
- glEnd();
- glBegin(GL_LINE_STRIP);
- for (i = 0; i <= 30; i++)
- glEvalCoord2f((GLfloat)j/8.0, (GLfloat)i/30.0);
- 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, &ctrlpoints[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 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();
- }
-
- int main(int argc, char** argv)
- {
- auxInitDisplayMode (AUX_SINGLE | AUX_RGB | AUX_DEPTH);
- auxInitPosition (0, 0, 500, 500);
- if (!auxInitWindow (argv[0]))
- auxQuit();
- myinit();
- auxReshapeFunc (myReshape);
- auxMainLoop(display);
- return 0;
- }
-
-