97 lines
2.7 KiB
C++
97 lines
2.7 KiB
C++
// screen-dump.cxx -- dump a copy of the opengl screen buffer to a file
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//
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// Contributed by Richard Kaszeta <bofh@me.umn.edu>, started October 1999.
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Library General Public
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// License as published by the Free Software Foundation; either
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// version 2 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Library General Public License for more details.
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//
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// You should have received a copy of the GNU Library General Public
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// License along with this library; if not, write to the
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// Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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// Boston, MA 02111-1307, USA.
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//
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// $Id$
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#ifdef HAVE_CONFIG_H
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# include <simgear_config.h>
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#endif
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#if defined(__CYGWIN__) /* && !defined(USING_X) */
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#define WIN32
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#endif
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#if defined(WIN32) /* MINGW and MSC predefine WIN32 */
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# include <windows.h>
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <limits.h>
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#include <GL/gl.h>
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#include "screen-dump.hxx"
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#define RGB3 3 // 3 bytes of color info per pixel
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#define RGBA 4 // 4 bytes of color+alpha info
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bool sg_glWritePPMFile(const char *filename, GLubyte *buffer, int win_width, int win_height, int mode)
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{
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int i, j, k, q;
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unsigned char *ibuffer;
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FILE *fp;
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int pixelSize = mode==GL_RGBA?4:3;
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ibuffer = (unsigned char *) malloc(win_width*win_height*RGB3);
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if ( (fp = fopen(filename, "wb")) == NULL ) {
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printf("Warning: cannot open %s\n", filename);
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return false;
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}
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fprintf(fp, "P6\n# CREATOR: glReadPixel()\n%d %d\n%d\n",
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win_width, win_height, UCHAR_MAX);
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q = 0;
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for (i = 0; i < win_height; i++)
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for (j = 0; j < win_width; j++)
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for (k = 0; k < RGB3; k++)
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ibuffer[q++] = (unsigned char)
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*(buffer + (pixelSize*((win_height-1-i)*win_width+j)+k));
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fwrite(ibuffer, sizeof(unsigned char), RGB3*win_width*win_height, fp);
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fclose(fp);
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free(ibuffer);
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printf("wrote file (%d x %d pixels, %d bytes)\n",
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win_width, win_height, RGB3*win_width*win_height);
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return true;
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}
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// dump the screen buffer to a ppm file
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bool sg_glDumpWindow(const char *filename, int win_width, int win_height) {
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GLubyte *buffer;
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bool result;
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buffer = (GLubyte *) malloc(win_width*win_height*RGBA);
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// read window contents from color buffer with glReadPixels
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glFinish();
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glReadPixels(0, 0, win_width, win_height,
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GL_RGBA, GL_UNSIGNED_BYTE, buffer);
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result = sg_glWritePPMFile( filename, buffer, win_width, win_height,
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GL_RGBA );
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free(buffer);
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return result;
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}
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