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Diffstat (limited to 'progs/redbook/trim.c')
| -rw-r--r-- | progs/redbook/trim.c | 187 |
1 files changed, 187 insertions, 0 deletions
diff --git a/progs/redbook/trim.c b/progs/redbook/trim.c new file mode 100644 index 000000000..f17674f68 --- /dev/null +++ b/progs/redbook/trim.c @@ -0,0 +1,187 @@ +/* + * Copyright (c) 1993-1997, 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 + * Unpublished-- rights reserved under the copyright laws of the + * United States.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(R) is a registered trademark of Silicon Graphics, Inc. + */ + +/* + * trim.c + * This program draws a NURBS surface in the shape of a + * symmetrical hill, using both a NURBS curve and pwl + * (piecewise linear) curve to trim part of the surface. + */ +#include <stdlib.h> +#include <GL/glut.h> +#include <stdio.h> + + +#ifndef CALLBACK +#define CALLBACK +#endif + + +GLfloat ctlpoints[4][4][3]; + +GLUnurbsObj *theNurb; + +/* + * Initializes the control points of the surface to a small hill. + * The control points range from -3 to +3 in x, y, and z + */ +void init_surface(void) +{ + int u, v; + for (u = 0; u < 4; u++) { + for (v = 0; v < 4; v++) { + ctlpoints[u][v][0] = 2.0*((GLfloat)u - 1.5); + ctlpoints[u][v][1] = 2.0*((GLfloat)v - 1.5); + + if ( (u == 1 || u == 2) && (v == 1 || v == 2)) + ctlpoints[u][v][2] = 3.0; + else + ctlpoints[u][v][2] = -3.0; + } + } +} + +void nurbsError(GLenum errorCode) +{ + const GLubyte *estring; + + estring = gluErrorString(errorCode); + fprintf (stderr, "Nurbs Error: %s\n", (char *) estring); + exit (0); +} + +/* Initialize material property and depth buffer. + */ +void init(void) +{ + GLfloat mat_diffuse[] = { 0.7, 0.7, 0.7, 1.0 }; + GLfloat mat_specular[] = { 1.0, 1.0, 1.0, 1.0 }; + GLfloat mat_shininess[] = { 100.0 }; + + glClearColor (0.0, 0.0, 0.0, 0.0); + glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_diffuse); + glMaterialfv(GL_FRONT, GL_SPECULAR, mat_specular); + glMaterialfv(GL_FRONT, GL_SHININESS, mat_shininess); + + glEnable(GL_LIGHTING); + glEnable(GL_LIGHT0); + glEnable(GL_DEPTH_TEST); + glEnable(GL_AUTO_NORMAL); + glEnable(GL_NORMALIZE); + + init_surface(); + + theNurb = gluNewNurbsRenderer(); + gluNurbsProperty(theNurb, GLU_SAMPLING_TOLERANCE, 25.0); + gluNurbsProperty(theNurb, GLU_DISPLAY_MODE, GLU_FILL); + gluNurbsCallback(theNurb, GLU_ERROR, + (GLvoid (CALLBACK*) ()) nurbsError); +} + +void display(void) +{ + GLfloat knots[8] = {0.0, 0.0, 0.0, 0.0, 1.0, 1.0, 1.0, 1.0}; + GLfloat edgePt[5][2] = /* counter clockwise */ + {{0.0, 0.0}, {1.0, 0.0}, {1.0, 1.0}, {0.0, 1.0}, {0.0, 0.0}}; + GLfloat curvePt[4][2] = /* clockwise */ + {{0.25, 0.5}, {0.25, 0.75}, {0.75, 0.75}, {0.75, 0.5}}; + GLfloat curveKnots[8] = + {0.0, 0.0, 0.0, 0.0, 1.0, 1.0, 1.0, 1.0}; + GLfloat pwlPt[4][2] = /* clockwise */ + {{0.75, 0.5}, {0.5, 0.25}, {0.25, 0.5}}; + + glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); + glPushMatrix(); + glRotatef(330.0, 1.,0.,0.); + glScalef (0.5, 0.5, 0.5); + + gluBeginSurface(theNurb); + gluNurbsSurface(theNurb, 8, knots, 8, knots, + 4 * 3, 3, &ctlpoints[0][0][0], + 4, 4, GL_MAP2_VERTEX_3); + gluBeginTrim (theNurb); + gluPwlCurve (theNurb, 5, &edgePt[0][0], 2, GLU_MAP1_TRIM_2); + gluEndTrim (theNurb); + gluBeginTrim (theNurb); + gluNurbsCurve (theNurb, 8, curveKnots, 2, + &curvePt[0][0], 4, GLU_MAP1_TRIM_2); + gluPwlCurve (theNurb, 3, &pwlPt[0][0], 2, GLU_MAP1_TRIM_2); + gluEndTrim (theNurb); + gluEndSurface(theNurb); + + glPopMatrix(); + glFlush(); +} + +void reshape(int w, int h) +{ + glViewport(0, 0, (GLsizei) w, (GLsizei) h); + glMatrixMode(GL_PROJECTION); + glLoadIdentity(); + gluPerspective (45.0, (GLdouble)w/(GLdouble)h, 3.0, 8.0); + + glMatrixMode(GL_MODELVIEW); + glLoadIdentity(); + glTranslatef (0.0, 0.0, -5.0); +} + +/* ARGSUSED1 */ +void keyboard(unsigned char key, int x, int y) +{ + switch (key) { + case 27: + exit(0); + break; + } +} + +/* Main Loop + */ +int main(int argc, char** argv) +{ + glutInit(&argc, argv); + glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH); + glutInitWindowSize (500, 500); + glutInitWindowPosition (100, 100); + glutCreateWindow(argv[0]); + init(); + glutReshapeFunc(reshape); + glutDisplayFunc(display); + glutKeyboardFunc (keyboard); + glutMainLoop(); + return 0; +} |