| /* aux2glut conversion Copyright (c) Mark J. Kilgard, 1994, 1995 */ |
| |
| /** |
| * (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| * Unpublished-- rights reserved under the copyright laws of the |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. |
| */ |
| /** |
| * surface.c |
| * This program draws a NURBS surface in the shape of a |
| * symmetrical hill. |
| */ |
| #include <GL/glut.h> |
| |
| GLfloat ctlpoints[4][4][3]; |
| int showPoints = 0; |
| |
| 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] = 7.0; |
| else |
| ctlpoints[u][v][2] = -3.0; |
| } |
| } |
| } |
| |
| /* Initialize material property and depth buffer. |
| */ |
| void myinit(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, 1.0); |
| 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); |
| glDepthFunc(GL_LESS); |
| 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); |
| |
| glMatrixMode(GL_MODELVIEW); |
| glLoadIdentity(); |
| glTranslatef (0.0, 0.0, -5.0); |
| } |
| |
| void display(void) |
| { |
| GLfloat knots[8] = {0.0, 0.0, 0.0, 0.0, 1.0, 1.0, 1.0, 1.0}; |
| int i, j; |
| |
| glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); |
| |
| glPushMatrix(); |
| glRotatef(330.0, 1.,0.,0.); |
| glScalef (0.25, 0.25, 0.25); |
| |
| gluBeginSurface(theNurb); |
| gluNurbsSurface(theNurb, |
| 8, knots, |
| 8, knots, |
| 4 * 3, |
| 3, |
| &ctlpoints[0][0][0], |
| 4, 4, |
| GL_MAP2_VERTEX_3); |
| gluEndSurface(theNurb); |
| |
| if(showPoints) { |
| glPointSize(5.0); |
| glDisable(GL_LIGHTING); |
| glColor3f(1.0, 1.0, 0.0); |
| glBegin(GL_POINTS); |
| for(i=0;i<4;i++) { |
| for(j=0;j<4;j++) { |
| glVertex3f(ctlpoints[i][j][0], ctlpoints[i][j][1], ctlpoints[i][j][2]); |
| } |
| } |
| glEnd(); |
| glEnable(GL_LIGHTING); |
| } |
| |
| glPopMatrix(); |
| glutSwapBuffers(); |
| } |
| |
| void reshape(int w, int h) |
| { |
| glViewport(0, 0, w, h); |
| glMatrixMode(GL_PROJECTION); |
| glLoadIdentity(); |
| gluPerspective (45.0, (GLdouble)w/(GLdouble)h, 3.0, 8.0); |
| |
| glMatrixMode(GL_MODELVIEW); |
| } |
| |
| void |
| menu(int value) |
| { |
| switch (value) { |
| case 0: |
| case 1: |
| showPoints = value; |
| break; |
| case 2: |
| gluNurbsProperty(theNurb, GLU_DISPLAY_MODE, GLU_FILL); |
| break; |
| case 3: |
| gluNurbsProperty(theNurb, GLU_DISPLAY_MODE, GLU_OUTLINE_POLYGON); |
| break; |
| } |
| glutPostRedisplay(); |
| } |
| |
| int down = 0, lastx; |
| |
| /* ARGSUSED1 */ |
| void |
| motion(int x, int y) |
| { |
| if (down) { |
| glRotatef(lastx - x, 0, 1, 0); |
| lastx = x; |
| glutPostRedisplay(); |
| } |
| } |
| |
| /* ARGSUSED3 */ |
| void |
| mouse(int button, int state, int x, int y) |
| { |
| if (button == GLUT_LEFT_BUTTON) { |
| if (state == GLUT_DOWN) { |
| lastx = x; |
| down = 1; |
| } else { |
| down = 0; |
| } |
| } |
| } |
| |
| /* Main Loop */ |
| int |
| main(int argc, char** argv) |
| { |
| glutInit(&argc, argv); |
| glutInitDisplayMode(GLUT_DEPTH | GLUT_DOUBLE | GLUT_RGB); |
| glutCreateWindow(argv[0]); |
| myinit(); |
| glutReshapeFunc(reshape); |
| glutDisplayFunc(display); |
| glutCreateMenu(menu); |
| glutAddMenuEntry("Show control points", 1); |
| glutAddMenuEntry("Hide control points", 0); |
| glutAddMenuEntry("Solid", 2); |
| glutAddMenuEntry("Wireframe", 3); |
| glutAttachMenu(GLUT_RIGHT_BUTTON); |
| glutMouseFunc(mouse); |
| glutMotionFunc(motion); |
| glutMainLoop(); |
| return 0; /* ANSI C requires main to return int. */ |
| } |