281 lines
7.9 KiB
C
281 lines
7.9 KiB
C
/*
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* Copyright (c) 1993-2003, Silicon Graphics, Inc.
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* All Rights Reserved
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*
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* Permission to use, copy, modify, and distribute this software for any
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* 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
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* notice and this permission notice appear in supporting documentation,
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* and that the name of Silicon Graphics, Inc. not be used in
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* advertising or publicity pertaining to distribution of the software
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* without specific, written prior permission.
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*
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* THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS" AND
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* 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 KIND,
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* OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION, LOSS OF
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* PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF THIRD
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* PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC. HAS BEEN ADVISED OF
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* THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE POSSESSION, USE
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* 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 clauses
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* in the FAR or the DOD or NASA FAR Supplement. Unpublished - rights
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* reserved under the copyright laws of the United States.
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*
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* Contractor/manufacturer is:
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* Silicon Graphics, Inc.
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* 1500 Crittenden Lane
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* Mountain View, CA 94043
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* United State of America
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*
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* OpenGL(R) is a registered trademark of Silicon Graphics, Inc.
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*/
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/*
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* surfpoints.c
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* This program is a modification of the earlier surface.c
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* program. The vertex data are not directly rendered,
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* but are instead passed to the callback function.
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* The values of the tessellated vertices are printed
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* out there.
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*
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* This program draws a NURBS surface in the shape of a
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* symmetrical hill. The 'c' keyboard key allows you to
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* toggle the visibility of the control points themselves.
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* Note that some of the control points are hidden by the
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* surface itself.
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*/
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#include <GL/glut.h>
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#include <stdlib.h>
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#include <stdio.h>
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#ifdef GLU_VERSION_1_3
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#ifndef CALLBACK
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#define CALLBACK
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#endif
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GLfloat ctlpoints[4][4][3];
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int showPoints = 0;
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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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static 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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static void CALLBACK nurbsError(GLenum errorCode)
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{
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const GLubyte *estring;
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estring = gluErrorString(errorCode);
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fprintf (stderr, "Nurbs Error: %s\n", estring);
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exit (0);
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}
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static void CALLBACK beginCallback(GLenum whichType)
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{
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glBegin (whichType); /* resubmit rendering directive */
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printf ("glBegin(");
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switch (whichType) { /* print diagnostic message */
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case GL_LINES:
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printf ("GL_LINES)\n");
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break;
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case GL_LINE_LOOP:
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printf ("GL_LINE_LOOP)\n");
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break;
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case GL_LINE_STRIP:
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printf ("GL_LINE_STRIP)\n");
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break;
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case GL_TRIANGLES:
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printf ("GL_TRIANGLES)\n");
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break;
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case GL_TRIANGLE_STRIP:
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printf ("GL_TRIANGLE_STRIP)\n");
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break;
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case GL_TRIANGLE_FAN:
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printf ("GL_TRIANGLE_FAN)\n");
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break;
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case GL_QUADS:
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printf ("GL_QUADS)\n");
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break;
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case GL_QUAD_STRIP:
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printf ("GL_QUAD_STRIP)\n");
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break;
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case GL_POLYGON:
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printf ("GL_POLYGON)\n");
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break;
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default:
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break;
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}
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}
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static void CALLBACK endCallback()
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{
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glEnd(); /* resubmit rendering directive */
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printf ("glEnd()\n");
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}
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static void CALLBACK vertexCallback(GLfloat *vertex)
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{
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glVertex3fv(vertex); /* resubmit rendering directive */
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printf ("glVertex3f (%5.3f, %5.3f, %5.3f)\n",
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vertex[0], vertex[1], vertex[2]);
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}
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static void CALLBACK normalCallback(GLfloat *normal)
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{
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glNormal3fv(normal); /* resubmit rendering directive */
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printf ("glNormal3f (%5.3f, %5.3f, %5.3f)\n",
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normal[0], normal[1], normal[2]);
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}
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/* Initialize material property and depth buffer.
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*/
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static void init(void)
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{
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GLfloat mat_diffuse[] = { 0.7, 0.7, 0.7, 1.0 };
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GLfloat mat_specular[] = { 1.0, 1.0, 1.0, 1.0 };
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GLfloat mat_shininess[] = { 100.0 };
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glClearColor (0.0, 0.0, 0.0, 0.0);
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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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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_NURBS_MODE,
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GLU_NURBS_TESSELLATOR);
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gluNurbsProperty(theNurb, GLU_SAMPLING_TOLERANCE, 25.0);
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gluNurbsProperty(theNurb, GLU_DISPLAY_MODE, GLU_FILL);
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gluNurbsCallback(theNurb, GLU_ERROR, nurbsError);
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gluNurbsCallback(theNurb, GLU_NURBS_BEGIN, beginCallback);
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gluNurbsCallback(theNurb, GLU_NURBS_VERTEX, vertexCallback);
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gluNurbsCallback(theNurb, GLU_NURBS_NORMAL, normalCallback);
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gluNurbsCallback(theNurb, GLU_NURBS_END, endCallback);
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}
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static 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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int i, j;
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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, 8, knots,
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4 * 3, 3, &ctlpoints[0][0][0],
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4, 4, GL_MAP2_VERTEX_3);
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gluEndSurface(theNurb);
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if (showPoints) {
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glPointSize(5.0);
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glDisable(GL_LIGHTING);
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glColor3f(1.0, 1.0, 0.0);
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glBegin(GL_POINTS);
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for (i = 0; i < 4; i++) {
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for (j = 0; j < 4; j++) {
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glVertex3f(ctlpoints[i][j][0],
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ctlpoints[i][j][1], ctlpoints[i][j][2]);
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}
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}
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glEnd();
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glEnable(GL_LIGHTING);
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}
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glPopMatrix();
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glFlush();
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}
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static void reshape(int w, int h)
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{
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glViewport(0, 0, (GLsizei) w, (GLsizei) 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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static void keyboard(unsigned char key, int x, int y)
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{
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switch (key) {
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case 'c':
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case 'C':
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showPoints = !showPoints;
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glutPostRedisplay();
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break;
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case 27:
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exit(0);
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break;
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default:
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break;
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}
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}
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int main(int argc, char** argv)
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{
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glutInit(&argc, argv);
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glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH);
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glutInitWindowSize (500, 500);
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glutInitWindowPosition (100, 100);
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glutCreateWindow(argv[0]);
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init();
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glutReshapeFunc(reshape);
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glutDisplayFunc(display);
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glutKeyboardFunc (keyboard);
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glutMainLoop();
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return 0;
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}
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#else
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int main(int argc, char** argv)
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{
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fprintf (stderr, "This program demonstrates a feature which is introduced in the\n");
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fprintf (stderr, "OpenGL Utility Library (GLU) Version 1.3.\n");
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fprintf (stderr, "If your implementation of GLU has the right extensions,\n");
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fprintf (stderr, "you may be able to modify this program to make it run.\n");
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return 0;
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}
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#endif
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