simple-egl: Print fps for the spinning triangle

This is not a benchmark.

diff --git a/clients/simple-egl.c b/clients/simple-egl.c
index f23243f..3db0e64 100644 (file)
--- a/clients/simple-egl.c
+++ b/clients/simple-egl.c
@@ -87,6 +87,7 @@ struct window {
                GLuint col;
        } gl;
 
+       uint32_t benchmark_time, frames;
        struct wl_egl_window *native;
        struct wl_surface *surface;
        struct wl_shell_surface *shell_surface;
@@ -412,11 +413,11 @@ redraw(void *data, struct wl_callback *callback, uint32_t time)
                { 0, 0, 1, 0 },
                { 0, 0, 0, 1 }
        };
-       static const int32_t speed_div = 5;
-       static uint32_t start_time = 0;
+       static const int32_t speed_div = 5, benchmark_interval = 5;
        struct wl_region *region;
        EGLint rect[4];
        EGLint buffer_age = 0;
+       struct timeval tv;
 
        assert(window->callback == callback);
        window->callback = NULL;
@@ -427,10 +428,20 @@ redraw(void *data, struct wl_callback *callback, uint32_t time)
        if (!window->configured)
                return;
 
-       if (start_time == 0)
-               start_time = time;
+       gettimeofday(&tv, NULL);
+       time = tv.tv_sec * 1000 + tv.tv_usec / 1000;
+       if (window->frames == 0)
+               window->benchmark_time = time;
+       if (time - window->benchmark_time > (benchmark_interval * 1000)) {
+               printf("%d frames in %d seconds: %f fps\n",
+                      window->frames,
+                      benchmark_interval,
+                      (float) window->frames / benchmark_interval);
+               window->benchmark_time = time;
+               window->frames = 0;
+       }
 
-       angle = ((time-start_time) / speed_div) % 360 * M_PI / 180.0;
+       angle = (time / speed_div) % 360 * M_PI / 180.0;
        rotation[0][0] =  cos(angle);
        rotation[0][2] =  sin(angle);
        rotation[2][0] = -sin(angle);
@@ -483,6 +494,7 @@ redraw(void *data, struct wl_callback *callback, uint32_t time)
        } else {
                eglSwapBuffers(display->egl.dpy, window->egl_surface);
        }
+       window->frames++;
 }
 
 static const struct wl_callback_listener frame_listener = {