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SGI Developer Toolbox 6.1
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SGI Developer Toolbox 6.1 - Disc 1.iso
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toolbox
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opengl
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GLUT
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oclip.c
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1996-11-11
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/* Copyright (c) Mark J. Kilgard, 1994. */
/**
* (c) Copyright 1993, 1994, 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* Unpublished-- rights reserved under the copyright laws of the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.
*/
/*----------------------------------------------------------------------------
*
* oclip.c : openGL (motif) example showing how to use arbitrary clipping plane.
*
* Author : Yusuf Attarwala
* SGI - Applications
* Date : Mar 93
*
* note : the main intent of this program is to demo the arbitrary
* clipping functionality, hence the rendering is kept
* simple (wireframe) and only one clipping plane is used.
*
* press left button to move object
* right button to move clipping plane
*
*
*---------------------------------------------------------------------------*/
#include <stdio.h>
#include <stdlib.h>
#include <GL/glut.h>
/* function declarations */
void
drawScene(void),
setMatrix(void),
animateClipPlane(void),
animation(void),
resize(int w, int h),
keyboard(unsigned char c, int x, int y);
/* global variables */
float ax,ay,az; /* angles for animation */
GLUquadricObj *quadObj; /* used in drawscene */
GLdouble planeEqn[] = {0.707,0.707,0.0,0.0}; /* initial clipping plane eqn */
int count = 0;
int clip_count = 0;
void
menu(int choice)
{
switch (choice) {
case 1 :
count = 90;
glutIdleFunc(animation);
break;
case 2 :
animateClipPlane();
break;
}
}
int
main(int argc, char** argv)
{
glutInit(&argc, argv);
quadObj = gluNewQuadric (); /* this will be used in drawScene */
glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE);
glutCreateWindow("Arbitrary clip plane");
ax = 10.0;
ay = -10.0;
az = 0.0;
glutDisplayFunc(drawScene);
glutReshapeFunc(resize);
glutKeyboardFunc(keyboard);
glutCreateMenu(menu);
glutAddMenuEntry("Rotate", 1);
glutAddMenuEntry("Move clip plane", 2);
glutAttachMenu(GLUT_RIGHT_BUTTON);
glutMainLoop();
return 0; /* ANSI C requires main to return int. */
}
void
drawScene(void)
{
glClearColor(0.0, 0.0, 0.0, 0.0);
glClear(GL_COLOR_BUFFER_BIT);
glPushMatrix();
gluQuadricDrawStyle (quadObj, GLU_LINE);
glColor3f (1.0, 1.0, 0.0);
glRotatef (ax,1.0,0.0,0.0);
glRotatef (-ay,0.0, 1.0, 0.0);
glClipPlane(GL_CLIP_PLANE0,planeEqn); /* define clipping plane */
glEnable(GL_CLIP_PLANE0); /* and enable it */
gluCylinder (quadObj, 2.0,5.0,10.0,20,8); /* draw a cone */
glDisable(GL_CLIP_PLANE0);
glPopMatrix();
glutSwapBuffers();
}
void
setMatrix(void)
{
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(-15.0,15.0,-15.0,15.0,-10.0,10.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
}
void
animation(void)
{
if(count) {
ax += 5.0;
ay -= 2.0;
az += 5.0;
if (ax >= 360) ax = 0.0;
if (ay <= -360) ay = 0.0;
if (az >= 360) az = 0.0;
glutPostRedisplay();
count--;
}
if(clip_count) {
static int sign = 1;
planeEqn[3] += sign*0.5;
if (planeEqn[3] > 4.0) sign = -1;
else if (planeEqn[3] < -4.0) sign = 1;
glutPostRedisplay();
clip_count--;
}
if(count <= 0 && clip_count <= 0) glutIdleFunc(NULL);
}
void
animateClipPlane(void)
{
clip_count = 5;
glutIdleFunc(animation);
}
void
keyboard(unsigned char c, int x, int y)
{
switch(c) {
case 27 :
exit(0);
break;
default:
break;
}
}
void
resize(int w, int h)
{
glViewport(0, 0, w, h);
setMatrix();
}