67 lines
2.2 KiB
Text
67 lines
2.2 KiB
Text
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From kaszeta@me.umn.edu Tue Apr 27 12:25:04 1999
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X-VM-v5-Data: ([nil nil nil nil nil nil nil nil nil]
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["1377" "Tue" "27" "April" "1999" "12:25:03" "-0500" "Richard Kaszeta" "kaszeta@me.umn.edu" nil "46" "Screen Dump under OpenGL" "^From:" nil nil "4" nil nil nil nil nil]
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nil)
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Received: from bofh.me.umn.edu (kaszeta@bofh.me.umn.edu [134.84.18.23])
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by meserv.me.umn.edu (8.9.1a/8.9.1) with ESMTP id MAA17257
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for <curt@me.umn.edu>; Tue, 27 Apr 1999 12:25:04 -0500 (CDT)
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Received: (from kaszeta@localhost)
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by bofh.me.umn.edu (8.9.1/8.9.1) id MAA32360;
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Tue, 27 Apr 1999 12:25:04 -0500
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MIME-Version: 1.0
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Content-Type: text/plain; charset=us-ascii
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Content-Transfer-Encoding: 7bit
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Message-ID: <14117.62191.861894.721574@bofh.me.umn.edu>
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X-Mailer: VM 6.47 under Emacs 19.34.1
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From: Richard Kaszeta <kaszeta@me.umn.edu>
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To: curt@me.umn.edu
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Subject: Screen Dump under OpenGL
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Date: Tue, 27 Apr 1999 12:25:03 -0500 (CDT)
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Dumps the framebuffer to a .ppm file:
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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/glut.h>
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#define RGB 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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void my_glDumpWindow(const char * filename, int win_width, int win_height) {
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int i, j, k, q;
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GLubyte *buffer;
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unsigned char *ibuffer;
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FILE *fp;
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buffer = (GLubyte *) malloc(win_width*win_height*RGBA);
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ibuffer = (unsigned char *) malloc(win_width*win_height*RGB);
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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, GL_RGBA, GL_UNSIGNED_BYTE, buffer);
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fp = fopen(filename, "w");
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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 < RGB; k++)
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ibuffer[q++] = (unsigned char)
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*(buffer + (RGBA*((win_height-1-i)*win_width+j)+k));
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fwrite(ibuffer, sizeof(unsigned char), RGB*win_width*win_height, fp);
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fclose(fp);
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free(buffer);
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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, RGB*win_width*win_height);
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}
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--
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Richard W Kaszeta PhD. Candidate and Sysadmin
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bofh@me.umn.edu University of MN, ME Dept
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http://www.menet.umn.edu/~kaszeta
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