162 lines
5.1 KiB
C
162 lines
5.1 KiB
C
/*
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* (c) Copyright 1993, Silicon Graphics, Inc.
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* ALL RIGHTS RESERVED
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* Permission to use, copy, modify, and distribute this software for
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* any purpose and without fee is hereby granted, provided that the above
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* copyright notice appear in all copies and that both the copyright notice
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* and this permission notice appear in supporting documentation, and that
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* the name of Silicon Graphics, Inc. not be used in advertising
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* or publicity pertaining to distribution of the software without specific,
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* written prior permission.
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*
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* THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS"
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* AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE,
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* INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR
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* FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL SILICON
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* GRAPHICS, INC. BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT,
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* SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY
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* KIND, OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION,
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* LOSS OF PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF
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* THIRD PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC. HAS BEEN
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* ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE
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* POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* US Government Users Restricted Rights
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* Use, duplication, or disclosure by the Government is subject to
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* restrictions set forth in FAR 52.227.19(c)(2) or subparagraph
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* (c)(1)(ii) of the Rights in Technical Data and Computer Software
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* clause at DFARS 252.227-7013 and/or in similar or successor
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* clauses in the FAR or the DOD or NASA FAR Supplement.
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* Unpublished-- rights reserved under the copyright laws of the
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* United States. Contractor/manufacturer is Silicon Graphics,
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* Inc., 2011 N. Shoreline Blvd., Mountain View, CA 94039-7311.
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*
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* OpenGL(TM) is a trademark of Silicon Graphics, Inc.
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*/
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/*
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* trim.c
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* This program draws a NURBS surface in the shape of a
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* symmetrical hill, using both a NURBS curve and pwl
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* (piecewise linear) curve to trim part of the surface.
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*/
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#include <windows.h>
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#include <GL/gl.h>
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#include <GL/glu.h>
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#include "glaux.h"
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GLfloat ctlpoints[4][4][3];
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GLUnurbsObj *theNurb;
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/*
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* Initializes the control points of the surface to a small hill.
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* The control points range from -3 to +3 in x, y, and z
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*/
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void init_surface(void)
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{
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int u, v;
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for (u = 0; u < 4; u++) {
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for (v = 0; v < 4; v++) {
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ctlpoints[u][v][0] = 2.0*((GLfloat)u - 1.5);
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ctlpoints[u][v][1] = 2.0*((GLfloat)v - 1.5);
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if ( (u == 1 || u == 2) && (v == 1 || v == 2))
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ctlpoints[u][v][2] = 3.0;
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else
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ctlpoints[u][v][2] = -3.0;
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}
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}
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}
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/* Initialize material property and depth buffer.
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*/
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void myinit(void)
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{
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GLfloat mat_diffuse[] = { 0.6, 0.6, 0.6, 1.0 };
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GLfloat mat_specular[] = { 0.9, 0.9, 0.9, 1.0 };
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GLfloat mat_shininess[] = { 128.0 };
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glClearColor (0.0, 0.0, 0.0, 1.0);
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glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_diffuse);
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glMaterialfv(GL_FRONT, GL_SPECULAR, mat_specular);
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glMaterialfv(GL_FRONT, GL_SHININESS, mat_shininess);
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glEnable(GL_LIGHTING);
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glEnable(GL_LIGHT0);
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glDepthFunc(GL_LESS);
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glEnable(GL_DEPTH_TEST);
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glEnable(GL_AUTO_NORMAL);
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glEnable(GL_NORMALIZE);
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init_surface();
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theNurb = gluNewNurbsRenderer();
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gluNurbsProperty(theNurb, GLU_SAMPLING_TOLERANCE, 50.0);
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gluNurbsProperty(theNurb, GLU_DISPLAY_MODE, GLU_FILL);
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}
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void display(void)
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{
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GLfloat knots[8] = {0.0, 0.0, 0.0, 0.0, 1.0, 1.0, 1.0, 1.0};
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GLfloat edgePt[5][2] = /* counter clockwise */
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{{0.0, 0.0}, {1.0, 0.0}, {1.0, 1.0}, {0.0, 1.0}, {0.0, 0.0}};
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GLfloat curvePt[4][2] = /* clockwise */
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{{0.25, 0.5}, {0.25, 0.75}, {0.75, 0.75}, {0.75, 0.5}};
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GLfloat curveKnots[8] =
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{0.0, 0.0, 0.0, 0.0, 1.0, 1.0, 1.0, 1.0};
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GLfloat pwlPt[4][2] = /* clockwise */
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{{0.75, 0.5}, {0.5, 0.25}, {0.25, 0.5}};
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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glPushMatrix();
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glRotatef(330.0, 1.,0.,0.);
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glScalef (0.5, 0.5, 0.5);
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gluBeginSurface(theNurb);
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gluNurbsSurface(theNurb,
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8, knots,
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8, knots,
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4 * 3,
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3,
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&ctlpoints[0][0][0],
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4, 4,
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GL_MAP2_VERTEX_3);
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gluBeginTrim (theNurb);
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gluPwlCurve (theNurb, 5, &edgePt[0][0], 2, GLU_MAP1_TRIM_2);
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gluEndTrim (theNurb);
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gluBeginTrim (theNurb);
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gluNurbsCurve (theNurb, 8, curveKnots, 2,
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&curvePt[0][0], 4, GLU_MAP1_TRIM_2);
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gluPwlCurve (theNurb, 3, &pwlPt[0][0], 2, GLU_MAP1_TRIM_2);
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gluEndTrim (theNurb);
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gluEndSurface(theNurb);
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glPopMatrix();
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glFlush();
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}
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void myReshape(GLsizei w, GLsizei h)
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{
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glViewport(0, 0, w, h);
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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gluPerspective (45.0, (GLdouble)w/(GLdouble)h, 3.0, 8.0);
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glMatrixMode(GL_MODELVIEW);
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glLoadIdentity();
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glTranslatef (0.0, 0.0, -5.0);
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}
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/* Main Loop
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*/
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int main(int argc, char** argv)
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{
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auxInitDisplayMode (AUX_SINGLE | AUX_RGB | AUX_DEPTH16);
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auxInitPosition (0, 0, 500, 500);
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auxInitWindow (argv[0]);
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myinit();
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auxReshapeFunc (myReshape);
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auxMainLoop(display);
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}
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