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Freelog Special Issue 2
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Freelog_HS_3_Setp_Oct_Nov_2000_CD2.mdx
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Arcade
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Orbit
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src
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screenshot.c
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C/C++ Source or Header
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1999-08-31
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2KB
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76 lines
/*
ORBIT, a freeware space combat simulator
Copyright (C) 1999 Steve Belczyk <steve1@genesis.nred.ma.us>
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "orbit.h"
ScreenShot()
{
char fname[32];
char *screen;
FILE *fd;
int x, y, c;
/* Construct file name */
sprintf (fname, "orbit%03d.ppm", screen_shot_num);
screen_shot_num++;
/* Allocate space for screen */
if (NULL == (screen = (char *) malloc (ScreenWidth*ScreenHeight*3)))
{
Cprint ("Can't allocate memory for screen shot");
return;
}
/* Get frame buffer */
glReadPixels (0, 0, ScreenWidth, ScreenHeight, GL_RGB,
GL_UNSIGNED_BYTE, screen);
/* Open the file */
if (NULL == (fd = fopen (fname, "wb")))
{
Cprint ("Can't open screen shot file");
free (screen);
return;
}
/* Write the PPM file */
fprintf (fd, "P6\n%d %d\n255\n", ScreenWidth, ScreenHeight);
for (y=0; y<ScreenHeight; y++)
{
for (x=0; x<ScreenWidth; x++)
{
c = 0xff & *screen++;
fputc (c, fd);
c = 0xff & *screen++;
fputc (c, fd);
c = 0xff & *screen++;
fputc (c, fd);
}
}
/* Close and clean up */
fclose (fd);
free (screen);
Cprint ("Screen shot saved in %s", fname);
}