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Amiga Format CD 52
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Amiga Format AFCD52 (Issue 136, May 2000).iso
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mesa
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book.aux
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aim.c
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2000-02-23
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/*
* (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* Unpublished-- rights reserved under the copyright laws of the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.
*/
/*
* aim.c
* This program calculates the fovy (field of view angle
* in the y direction), by using trigonometry, given the
* size of an object and its size.
*/
#include <GL/gl.h>
#include <GL/glu.h>
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <GL/glaux.h>
void myinit(void)
{
glShadeModel(GL_FLAT);
}
/*
* Clear the screen. Set the current color to white.
* * Draw the wire frame cube and sphere.
*/
void display(void)
{
glClear(GL_COLOR_BUFFER_BIT);
glColor3f(1.0, 1.0, 1.0);
glLoadIdentity();
/*
* glTranslatef() as viewing transformation
*/
glTranslatef(0.0, 0.0, -5.0);
auxWireCube(2.0);
auxWireSphere(1.0);
glFlush();
}
#ifndef PI
#define PI 3.1415926535
#endif
/*
* atan2 () is a system math routine which calculates
* * the arctangent of an angle, given length of the
* * opposite and adjacent sides of a right triangle.
* * atan2 () is not an OpenGL routine.
*/
GLdouble calculateAngle(double size, double distance)
{
GLdouble radtheta, degtheta;
radtheta = 2.0 * atan2(size / 2.0, distance);
degtheta = (180.0 * radtheta) / PI;
printf("degtheta is %f\n", degtheta);
return ((GLdouble) degtheta);
}
/*
* Called when the window is first opened and whenever
* * the window is reconfigured (moved or resized).
*/
void myReshape(int w, int h)
{
GLdouble theta;
glViewport(0, 0, w, h);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
theta = calculateAngle(2.0, 5.0);
gluPerspective(theta, (GLfloat) w / (GLfloat) h, 1.0, 20.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
}
/*
* Main Loop
* * Open window with initial window size, title bar,
* * RGBA display mode, and handle input events.
*/
int main(int argc, char **argv)
{
auxInitDisplayMode(AUX_SINGLE | AUX_RGB);
auxInitPosition(0, 0, 500, 500);
if (!auxInitWindow(argv[0]))
auxQuit();
myinit();
auxReshapeFunc(myReshape);
auxMainLoop(display);
return 0;
}