Improve timer statistics in test/cube demo
These timer statistics are useful to see the interaction of OpenGL drawing and FLTK timers (Fl::add_timer + Fl::repeat_timer).
This commit is contained in:
Albrecht Schlosser
parent
fe8a94d236
commit
ff161187e7
@ -17,7 +17,7 @@
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//
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// Define 'HAVE_GL=1' on the compiler commandline to build this program
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// w/o 'config.h' (needs FLTK lib with GL).
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// w/o 'config.h' (needs FLTK lib with GL), for instance like:
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// $ fltk-config --use-gl --compile cube.cxx -DHAVE_GL=1
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// Use '-DHAVE_GL=0' to build and test w/o OpenGL support.
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@ -41,15 +41,23 @@
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// Glocal constants and variables
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const int FPS = 25; // desired frame rate (independent of speed slider)
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const int MAX_LOOP = 0; // <= 0: no limit, >0: max. timer (draw) iterations
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int iters = 0; // total loop (draw) iterations
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int done = 0; // set to 1 in exit button callback
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Fl_Timestamp start; // taken at start of main
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const double fps = 25.0; // desired frame rate (independent of speed slider)
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const double delay = 1.0/fps; // calculated timer delay
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int count = -2; // initialize loop (draw) counter
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int done = 0; // set to 1 in exit button callback
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Fl_Timestamp start; // taken at start of main or after reset
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// Pointers to widgets
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#define DEBUG_TIMER (0) // >0: detailed debugging, see code (should be 0)
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class cube_box; // forward declaration
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#if (DEBUG_TIMER)
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const double dx = 0.001; // max. allowed deviation from delta time
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const double d_min = delay - dx;
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const double d_max = delay + dx;
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#endif // DEBUG_TIMER
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// Global pointers to widgets
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class cube_box;
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Fl_Window *form;
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Fl_Slider *speed, *size;
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@ -182,35 +190,73 @@ void overlay_button(cube_box *cube) {
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void exit_cb(Fl_Widget *w = NULL, void *v = NULL) {
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#if HAVE_GL
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// display performance data on stdout and (for Windows!) in a message window
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double runtime = Fl::seconds_since(start);
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char buffer[120];
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sprintf(buffer, "Iterations = %4d, runtime = %7.3f sec, fps = %5.2f, requested: %d",
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iters, runtime, iters / runtime, FPS);
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sprintf(buffer, "Count =%5d, time = %7.3f sec, fps = %5.2f, requested: %5.2f",
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count, runtime, count / runtime, fps);
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printf("%s\n", buffer);
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fflush(stdout);
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int choice = fl_choice("%s", "Continue", "Exit", NULL, buffer);
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if (choice == 1) {
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// exit program, close all windows
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done = 1;
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Fl::hide_all_windows(); // return from Fl::run()
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int choice = fl_choice("%s", "E&xit", "&Continue", "&Reset", buffer);
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switch(choice) {
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case 0: // exit program, close all windows
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done = 1;
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Fl::hide_all_windows();
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break;
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case 2: // reset
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count = -2;
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printf("*** RESET ***\n");
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fflush(stdout);
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break;
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default: // continue
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break;
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}
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#else
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done = 1;
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Fl::hide_all_windows();
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#endif
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}
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#if HAVE_GL
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void timer_cb(void *data) {
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iters++;
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if (done || (MAX_LOOP > 0 && iters >= MAX_LOOP)) {
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exit_cb();
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return;
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static Fl_Timestamp last = Fl::now();
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static Fl_Timestamp now;
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count++;
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if (count == 0) {
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start = Fl::now();
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last = start;
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} else if (count > 0) {
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now = Fl::now();
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#if (DEBUG_TIMER)
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double delta = Fl::seconds_since(last);
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if ((delta < d_min || delta > d_max) && count > 1) {
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printf("Count =%5d, delay should be %7.5f but %7.5f is outside [%7.5f .. %7.5f]\n",
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count, delay, delta, d_min, d_max);
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fflush(stdout);
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}
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#endif // DEBUG_TIMER
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}
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#if (DEBUG_TIMER > 1)
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if (count > 0 && count <= DEBUG_TIMER) { // log the first N iterations
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double runtime = Fl::seconds_since(start);
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printf("Count =%5d, time = %7.3f sec, fps = %5.2f, requested: %5.2f\n",
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count, runtime, count / runtime, fps);
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fflush(stdout);
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}
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#endif // (DEBUG_TIMER > 1)
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lt_cube->redraw();
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rt_cube->redraw();
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Fl::repeat_timeout(1.0/FPS, timer_cb);
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Fl::repeat_timeout(delay, timer_cb);
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last = Fl::now();
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}
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#endif // HAVE_GL
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@ -305,7 +351,11 @@ void makeform(const char *name) {
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flat = new Fl_Radio_Light_Button( 0, 0, 100, 25, "Flat");
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speed = new Fl_Slider(FL_VERT_SLIDER, 0, 0, 40, 90, "Speed");
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size = new Fl_Slider(FL_VERT_SLIDER, 0, 0, 40, 90, "Size");
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exit_button = new Fl_Button( 0, 0, 100, 25, "Stats / Exit");
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#if HAVE_GL
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exit_button = new Fl_Button( 0, 0, 100, 25, "Stats / E&xit");
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#else
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exit_button = new Fl_Button( 0, 0, 100, 25, "E&xit");
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#endif
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exit_button->callback(exit_cb);
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exit_button->tooltip("Display statistics (fps) and\nchoose to exit or continue\n");
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@ -378,8 +428,8 @@ int main(int argc, char **argv) {
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// with GL: use a timer for drawing and measure performance
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Fl::add_timeout(0.01, timer_cb); // start timer
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start = Fl::now();
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form->wait_for_expose();
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Fl::add_timeout(0.1, timer_cb); // start timer
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int ret = Fl::run();
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return ret;
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