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basic-game-framework
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delta_time is now calculating by converting timespec to seconds

pull/8/head
Sara 2023-06-18 17:59:50 +02:00
parent fcb9645dbe
commit d69b92a464
2 changed files with 21 additions and 3 deletions
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22
src/engine.c
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@ -5,11 +5,27 @@
#include "corelib/input.h"
#include "time.h"
static float _delta_time = 0;
static double _delta_time = 0;
static double _min_frame_interval = 0;
static struct timespec start_last_frame;
#define CURRENT_TIME(__out) { struct timespect ts; timespec_get(&ts, TIME_UTC); __out = ts.tv_sec + tv.nsec * 1E-09; }
inline static
double timespec_to_sec(struct timespec spec) {
return spec.tv_sec + spec.tv_nsec;
}
inline float delta_time() {
return _delta_time;
return (float)_delta_time;
}
void set_frame_interval(double frame_interval) {
_min_frame_interval = frame_interval;
}
void set_frame_rate_limit(int fps) {
_min_frame_interval = 1.0/(double)fps;
}
static inline
@ -58,7 +74,7 @@ int _engine_run() {
struct timespec next_time;
while(g_context.running) {
timespec_get(&next_time, TIME_UTC);
_delta_time = (next_time.tv_nsec - start_last_frame.tv_nsec) * 1E-9;
_delta_time = timespec_to_sec(next_time) - timespec_to_sec(start_last_frame);
if(next_time.tv_nsec < start_last_frame.tv_nsec) _delta_time = 0;
start_last_frame = next_time;
_handle_events();

2
src/engine.h
View File

@ -6,6 +6,8 @@ extern "C" {
#endif
extern float delta_time();
extern void set_frame_interval(double frame_interval);
extern void set_frame_rate_limit(int fps);
/* TO BE DEFINED IN GAME */