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loop.c
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324 lines (187 loc) · 5.43 KB
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#include "loop.h"
Uint64 loop_performance_frequency;
Uint64 loop_last_performance_counter;
float loop_fdelta_time;
Uint64 loop_u64delta_time;
Uint64 loop_elapsed_performance_counter;
Uint64 loop_target_elapsed_performance_counter;
buffer_t *loop_start_callback_buffer;
buffer_t *loop_on_start_callback_buffer;
buffer_t *loop_on_middle_callback_buffer;
buffer_t *loop_on_end_callback_buffer;
buffer_t *loop_end_callback_buffer;
Uint64 _loop_current_performance_counter;
Uint64 _loop_performance_counter_per_millisecond;
static void _loop_run_callback_buffer(buffer_t *buffer)
{
size_t count = buffer->count / sizeof(void *);
for (size_t i = 0; i < count; ++i)
{
loop_callback_t callback = *(loop_callback_t *)(buffer->items + i * sizeof(void *));
if (callback)
{
callback();
}
}
}
int loop_init(void)
{
loop_start_callback_buffer = new_buffer(LOOP_CALLBACK_BUFFER_SIZE);
if (!loop_start_callback_buffer)
{
loop_quit();
return EPERM;
}
loop_on_start_callback_buffer = new_buffer(LOOP_CALLBACK_BUFFER_SIZE);
if (!loop_on_start_callback_buffer)
{
loop_quit();
return ENOENT;
}
loop_on_middle_callback_buffer = new_buffer(LOOP_CALLBACK_BUFFER_SIZE);
if (!loop_on_middle_callback_buffer)
{
loop_quit();
return ESRCH;
}
loop_on_end_callback_buffer = new_buffer(LOOP_CALLBACK_BUFFER_SIZE);
if (!loop_on_end_callback_buffer)
{
loop_quit();
return EINTR;
}
loop_end_callback_buffer = new_buffer(LOOP_CALLBACK_BUFFER_SIZE);
if (!loop_end_callback_buffer)
{
loop_quit();
return EIO;
}
return 0;
}
int loop_callback_buffer_append(buffer_t *buffer, loop_callback_t callback)
{
return buffer_append(buffer, sizeof(loop_callback_t), (char *)&callback);
}
int loop_callback_buffer_remove(buffer_t *buffer, loop_callback_t callback)
{
/*TODO: .*/
return 0;
}
int loop_start (void)
{
loop_performance_frequency = SDL_GetPerformanceFrequency();
loop_last_performance_counter = SDL_GetPerformanceCounter();
loop_elapsed_performance_counter = 0;
_loop_performance_counter_per_millisecond = loop_performance_frequency / LOOP_MILLISECONDS_PER_SECOND;
if (loop_start_callback_buffer == NULL)
{
return EFAULT;
}
_loop_run_callback_buffer(loop_start_callback_buffer);
return 0;
}
int loop_set_target_elapsed_performance_counter_u64ms(Uint64 ms)
{
if (loop_performance_frequency == 0)
{
return EPERM;
}
loop_target_elapsed_performance_counter = _loop_performance_counter_per_millisecond * ms;
return 0;
}
int loop_set_target_elapsed_performance_counter_fms(float ms)
{
if (loop_performance_frequency == 0)
{
return EPERM;
}
loop_target_elapsed_performance_counter = (Uint64)(_loop_performance_counter_per_millisecond * ms);
return 0;
}
int loop_on_start (void)
{
if (loop_performance_frequency == 0)
{
return EPERM;
}
int return_value = 0;
if (loop_on_start_callback_buffer != NULL)
{
_loop_run_callback_buffer(loop_on_start_callback_buffer);
}
else
{
return_value = EFAULT;
}
_loop_current_performance_counter = SDL_GetPerformanceCounter();
loop_fdelta_time = (float)(_loop_current_performance_counter - loop_last_performance_counter) / (float)loop_performance_frequency;
loop_u64delta_time = (_loop_current_performance_counter - loop_last_performance_counter) / _loop_performance_counter_per_millisecond;
loop_last_performance_counter = _loop_current_performance_counter;
return return_value;
}
int loop_on_middle(void)
{
if (loop_performance_frequency == 0)
{
return EPERM;
}
if (loop_on_middle_callback_buffer == NULL)
{
return EFAULT;
}
_loop_run_callback_buffer(loop_on_middle_callback_buffer);
return 0;
}
int loop_on_end (void)
{
if (loop_performance_frequency == 0)
{
return EPERM;
}
int return_value = 0;
if (loop_on_end_callback_buffer != NULL)
{
_loop_run_callback_buffer(loop_on_end_callback_buffer);
}
else
{
return_value = EFAULT;
}
_loop_current_performance_counter = SDL_GetPerformanceCounter();
loop_elapsed_performance_counter = _loop_current_performance_counter - loop_last_performance_counter;
if (loop_elapsed_performance_counter < loop_target_elapsed_performance_counter)
{
Uint64 remainin_elapsed_performance_counter = loop_target_elapsed_performance_counter - loop_elapsed_performance_counter;
Uint64 milliseconds = remainin_elapsed_performance_counter / _loop_performance_counter_per_millisecond;
if (milliseconds > 0)
{
SDL_Delay((Uint32)milliseconds);
}
#ifdef LOOP_C_SPIN_WAIT
while (
(SDL_GetPerformanceCounter() - loop_last_performance_counter) < loop_target_elapsed_performance_counter
)
{
;
}
#endif
}
return return_value;
}
int loop_end (void)
{
if (loop_performance_frequency == 0)
{
return EPERM;
}
if (loop_end_callback_buffer == NULL)
{
return EFAULT;
}
_loop_run_callback_buffer(loop_end_callback_buffer);
return 0;
}
void loop_quit (void)
{
/* TODO: . */
}