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extremetuxracer  0.5beta
screenshot.cpp
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00001 /* 
00002  * PPRacer 
00003  * Copyright (C) 2004-2005 Volker Stroebel <volker@planetpenguin.de>
00004  * 
00005  * Copyright (C) 1999-2001 Jasmin F. Patry
00006  * 
00007  * This program is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU General Public License
00009  * as published by the Free Software Foundation; either version 2
00010  * of the License, or (at your option) any later version.
00011  * 
00012  * This program is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00015  * GNU General Public License for more details.
00016  * 
00017  * You should have received a copy of the GNU General Public License
00018  * along with this program; if not, write to the Free Software
00019  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
00020  */
00021 
00022 
00023 #include "etracer.h"
00024 #include "screenshot.h"
00025 #include "ppgltk/images/image.h"
00026 
00027 static int screenshot_num = 0;
00028 
00029 void screenshot()
00030 {
00031     char buff[20];
00032     sprintf( buff, "tux_sshot_%d.ppm", screenshot_num++ );
00033     if(!take_screenshot( buff )){
00034         fprintf( stderr, "Couldn't save screenshot\n");
00035     };
00036 } 
00037 
00038 bool take_screenshot ( char* fileName ) {
00039 
00040        int viewport[4];
00041        glGetIntegerv( GL_VIEWPORT, (GLint*)viewport );
00042        glReadBuffer( GL_FRONT );
00043        
00044        pp::Image image(viewport[2],viewport[3],3);
00045        
00046        image.width=viewport[2];
00047        image.height=viewport[3];
00048        image.depth=3;
00049        
00050        for (int i=0; i<viewport[3]; i++){
00051               glReadPixels(viewport[0], viewport[1]+viewport[3]-1-i,
00052                      viewport[2], 1, GL_RGB, 
00053                      GL_UNSIGNED_BYTE, image.data+viewport[2]*i*3
00054                      );
00055        }
00056        
00057        return image.writeToFile(fileName);
00058 }