static gboolean gtk_gears_tick (GtkWidget *widget, GdkFrameClock *frame_clock, gpointer user_data) { GtkGears *gears = GTK_GEARS (widget); GtkGearsPrivate *priv = gtk_gears_get_instance_private (gears); GdkFrameTimings *timings, *previous_timings; gint64 previous_frame_time = 0; gint64 frame_time; gint64 history_start, history_len; gint64 frame; char *s; frame = gdk_frame_clock_get_frame_counter (frame_clock); frame_time = gdk_frame_clock_get_frame_time (frame_clock); if (priv->first_frame_time == 0) { /* No need for changes on first frame */ priv->first_frame_time = frame_time; if (priv->fps_label) gtk_label_set_label (priv->fps_label, "FPS: ---"); return G_SOURCE_CONTINUE; } /* glxgears advances 70 degrees per second, so do the same */ priv->angle = fmod ((frame_time - priv->first_frame_time) / (double)G_USEC_PER_SEC * 70.0, 360.0); gtk_widget_queue_draw (widget); history_start = gdk_frame_clock_get_history_start (frame_clock); if (priv->fps_label && frame % 60 == 0) { history_len = frame - history_start; if (history_len > 0) { previous_timings = gdk_frame_clock_get_timings (frame_clock, frame - history_len); previous_frame_time = gdk_frame_timings_get_frame_time (previous_timings); s = g_strdup_printf ("FPS: %-4.1f", (G_USEC_PER_SEC * history_len) / (double)(frame_time - previous_frame_time)); gtk_label_set_label (priv->fps_label, s); g_free (s); } } timings = gdk_frame_clock_get_current_timings (frame_clock); previous_timings = gdk_frame_clock_get_timings (frame_clock, gdk_frame_timings_get_frame_counter (timings) - 1); if (previous_timings != NULL) previous_frame_time = gdk_frame_timings_get_frame_time (previous_timings); return G_SOURCE_CONTINUE; }
static void on_update (GdkFrameClock *frame_clock, gpointer data) { GdkFrameTimings *timings = gdk_frame_clock_get_current_timings (frame_clock); gint64 frame_time = gdk_frame_timings_get_frame_time (timings); gint64 predicted_presentation_time = gdk_frame_timings_get_predicted_presentation_time (timings); gint64 refresh_interval; FrameData *pending_frame; if (clock_time_base == 0) clock_time_base = frame_time + PRE_BUFFER_TIME; gdk_frame_clock_get_refresh_info (frame_clock, frame_time, &refresh_interval, NULL); pending_frame = peek_pending_frame (); if (stream_time_to_clock_time (pending_frame->stream_time) < predicted_presentation_time + refresh_interval / 2) { while (TRUE) { FrameData *next_frame = peek_next_frame (); if (next_frame && stream_time_to_clock_time (next_frame->stream_time) < predicted_presentation_time + refresh_interval / 2) { g_slice_free (FrameData, unqueue_frame ()); n_frames++; dropped_frames++; pending_frame = next_frame; } else break; } if (displayed_frame) past_frames = g_list_prepend (past_frames, displayed_frame); n_frames++; displayed_frame = unqueue_frame (); displayed_frame->clock_time = stream_time_to_clock_time (displayed_frame->stream_time); displayed_frame->frame_counter = gdk_frame_timings_get_frame_counter (timings); variable_add (&time_factor_stats, time_factor); collect_old_frames (); print_statistics (); gtk_widget_queue_draw (window); } }
static void handle_frame_stats (GdkFrameClock *frame_clock) { static int num_stats = 0; static double last_print_time = 0; static int frames_since_last_print = 0; static gint64 frame_counter; static gint64 last_handled_frame = -1; static Variable latency = VARIABLE_INIT; double current_time; current_time = g_get_monotonic_time (); if (current_time >= last_print_time + 1000000 * statistics_time) { if (frames_since_last_print) { if (num_stats == 0 && machine_readable) { g_print ("# load_factor frame_rate latency\n"); } num_stats++; if (machine_readable) g_print ("%g ", load_factor); print_double ("Frame rate ", frames_since_last_print / ((current_time - last_print_time) / 1000000.)); print_variable ("Latency", &latency); g_print ("\n"); } last_print_time = current_time; frames_since_last_print = 0; variable_reset (&latency); if (num_stats == max_stats) gtk_main_quit (); } frames_since_last_print++; for (frame_counter = last_handled_frame; frame_counter < gdk_frame_clock_get_frame_counter (frame_clock); frame_counter++) { GdkFrameTimings *timings = gdk_frame_clock_get_timings (frame_clock, frame_counter); GdkFrameTimings *previous_timings = gdk_frame_clock_get_timings (frame_clock, frame_counter - 1); if (!timings || gdk_frame_timings_get_complete (timings)) last_handled_frame = frame_counter; if (timings && gdk_frame_timings_get_complete (timings) && previous_timings && gdk_frame_timings_get_presentation_time (timings) != 0 && gdk_frame_timings_get_presentation_time (previous_timings) != 0) { double display_time = (gdk_frame_timings_get_presentation_time (timings) - gdk_frame_timings_get_presentation_time (previous_timings)) / 1000.; double frame_latency = (gdk_frame_timings_get_presentation_time (previous_timings) - gdk_frame_timings_get_frame_time (previous_timings)) / 1000. + display_time / 2; variable_add_weighted (&latency, frame_latency, display_time); } } }