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Improve framerate counting

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The FPS counter was called only on new frames, so it could not print
values regularly, especially when there are very few FPS (when the
device surface does not change).

To the extreme, it was never able to display 0 fps.

Add a separate thread to print framerate every second.
This commit is contained in:
Romain Vimont
2019-06-07 16:55:19 +02:00
parent d104d3bda9
commit e2a272bf99
6 changed files with 207 additions and 52 deletions
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36
app/src/fps_counter.h
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@@ -3,23 +3,49 @@
#include <stdbool.h>
#include <stdint.h>
#include <SDL2/SDL_atomic.h>
#include <SDL2/SDL_mutex.h>
#include <SDL2/SDL_thread.h>
struct fps_counter {
bool started;
uint32_t slice_start; // initialized by SDL_GetTicks()
int nr_rendered;
int nr_skipped;
SDL_Thread *thread;
SDL_mutex *mutex;
SDL_cond *state_cond;
// atomic so that we can check without locking the mutex
// if the FPS counter is disabled, we don't want to lock unnecessarily
SDL_atomic_t started;
// the following fields are protected by the mutex
bool interrupted;
unsigned nr_rendered;
unsigned nr_skipped;
uint32_t next_timestamp;
};
void
bool
fps_counter_init(struct fps_counter *counter);
void
fps_counter_destroy(struct fps_counter *counter);
bool
fps_counter_start(struct fps_counter *counter);
void
fps_counter_stop(struct fps_counter *counter);
bool
fps_counter_is_started(struct fps_counter *counter);
// request to stop the thread (on quit)
// must be called before fps_counter_join()
void
fps_counter_interrupt(struct fps_counter *counter);
void
fps_counter_join(struct fps_counter *counter);
void
fps_counter_add_rendered_frame(struct fps_counter *counter);