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antipindex.c
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C/C++ Source or Header
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1999-06-25
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4KB
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120 lines
/*
* (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* Unpublished-- rights reserved under the copyright laws of the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.
*/
/*
* antipindex.c
* The program draws antialiased points,
* in color index mode.
*/
#include <GL/gl.h>
#include <GL/glu.h>
#include <stdlib.h>
#include <GL/glaux.h>
#define RAMPSIZE 16
#define RAMPSTART 32
/*
* Initialize point antialiasing for color index mode,
* * including loading a grey color ramp starting at
* * RAMPSTART, which must be a multiple of 16.
*/
void myinit(void)
{
int i;
for (i = 0; i < RAMPSIZE; i++) {
GLfloat shade;
shade = (GLfloat) i / (GLfloat) RAMPSIZE;
auxSetOneColor(RAMPSTART + (GLint) i, shade, shade, shade);
}
glEnable(GL_POINT_SMOOTH);
glHint(GL_POINT_SMOOTH_HINT, GL_FASTEST);
glPointSize(3.0);
glClearIndex((GLfloat) RAMPSTART);
}
/*
* display() draws several points.
*/
void display(void)
{
int i;
glClear(GL_COLOR_BUFFER_BIT);
glIndexi(RAMPSTART);
glBegin(GL_POINTS);
for (i = 1; i < 10; i++) {
glVertex2f((GLfloat) i * 10.0, (GLfloat) i * 10.0);
}
glEnd();
glFlush();
}
void myReshape(int w, int h)
{
glViewport(0, 0, w, h);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
if (w < h)
glOrtho(0.0, 100.0, 0.0,
100.0 * (GLfloat) h / (GLfloat) w, -1.0, 1.0);
else
glOrtho(0.0, 100.0 * (GLfloat) w / (GLfloat) h,
0.0, 100.0, -1.0, 1.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
}
/*
* Main Loop
* * Open window with initial window size, title bar,
* * color index display mode, and handle input events.
*/
int main(int argc, char **argv)
{
auxInitDisplayMode(AUX_SINGLE | AUX_INDEX);
auxInitPosition(0, 0, 100, 100);
if (!auxInitWindow(argv[0]))
auxQuit();
myinit();
auxReshapeFunc(myReshape);
auxMainLoop(display);
return 0;
}