1 /* Copyright © 2013, Intel Corporation
3 * Permission is hereby granted, free of charge, to any person obtaining a copy
4 * of this software and associated documentation files (the "Software"), to deal
5 * in the Software without restriction, including without limitation the rights
6 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
7 * copies of the Software, and to permit persons to whom the Software is
8 * furnished to do so, subject to the following conditions:
10 * The above copyright notice and this permission notice shall be included in
11 * all copies or substantial portions of the Software.
13 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
14 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
15 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
16 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
17 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
18 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
34 typedef void (* fips_glXSwapBuffers_t)(Display *dpy, GLXDrawable drawable);
37 lookup (const char *name)
39 const char *libgl_filename = "libGL.so.1";
40 static void *libgl_handle = NULL;
43 libgl_handle = dlopen (libgl_filename, RTLD_NOW);
45 fprintf (stderr, "Error: Failed to dlopen %s\n",
51 return dlsym (libgl_handle, name);
55 call_glXSwapBuffers (Display *dpy, GLXDrawable drawable)
57 static fips_glXSwapBuffers_t real_glXSwapBuffers = NULL;
58 const char *name = "glXSwapBuffers";
60 if (! real_glXSwapBuffers) {
61 real_glXSwapBuffers = (fips_glXSwapBuffers_t) lookup (name);
62 if (! real_glXSwapBuffers) {
63 fprintf (stderr, "Error: Failed to find function %s.\n",
68 real_glXSwapBuffers (dpy, drawable);
72 glXSwapBuffers (Display *dpy, GLXDrawable drawable)
74 static int initialized = 0;
76 static struct timeval tv_start, tv_now;
80 gettimeofday (&tv_start, NULL);
84 call_glXSwapBuffers (dpy, drawable);
87 if (frames % 60 == 0) {
89 gettimeofday (&tv_now, NULL);
91 fps = (double) frames / (tv_now.tv_sec - tv_start.tv_sec +
92 (tv_now.tv_usec - tv_start.tv_usec) / 1.0e6);
94 printf("FPS: %.3f\n", fps);