78 lines
1.8 KiB
C++
78 lines
1.8 KiB
C++
/*
|
|
* This file is part of the DXX-Rebirth project <http://www.dxx-rebirth.com/>.
|
|
* It is copyright by its individual contributors, as recorded in the
|
|
* project's Git history. See COPYING.txt at the top level for license
|
|
* terms and a link to the Git history.
|
|
*/
|
|
/*
|
|
*
|
|
* SDL library timer functions
|
|
*
|
|
*/
|
|
|
|
#include <SDL.h>
|
|
|
|
#include "maths.h"
|
|
#include "timer.h"
|
|
#include "config.h"
|
|
#include "multi.h"
|
|
|
|
namespace dcx {
|
|
|
|
static fix64 F64_RunTime = 0;
|
|
|
|
fix64 timer_update()
|
|
{
|
|
static bool already_initialized;
|
|
static fix64 last_tv;
|
|
const fix64 cur_tv = static_cast<fix64>(SDL_GetTicks()) * F1_0 / 1000;
|
|
const fix64 prev_tv = last_tv;
|
|
fix64 runtime = F64_RunTime;
|
|
last_tv = cur_tv;
|
|
if (unlikely(!already_initialized))
|
|
{
|
|
already_initialized = true;
|
|
}
|
|
else if (likely(prev_tv < cur_tv)) // in case SDL_GetTicks wraps, don't update and have a little hickup
|
|
F64_RunTime = (runtime += (cur_tv - prev_tv)); // increment! this value will overflow long after we are all dead... so why bother checking?
|
|
return runtime;
|
|
}
|
|
|
|
fix64 timer_query(void)
|
|
{
|
|
return (F64_RunTime);
|
|
}
|
|
|
|
void timer_delay_ms(unsigned milliseconds)
|
|
{
|
|
SDL_Delay(milliseconds);
|
|
}
|
|
|
|
// Replacement for timer_delay which considers calc time the program needs between frames (not reentrant)
|
|
void timer_delay_bound(const unsigned caller_bound)
|
|
{
|
|
static uint32_t FrameStart;
|
|
|
|
uint32_t start = FrameStart;
|
|
const auto multiplayer = Game_mode & GM_MULTI;
|
|
const auto vsync = CGameCfg.VSync;
|
|
const auto bound = vsync ? 1000u / MAXIMUM_FPS : caller_bound;
|
|
for (;;)
|
|
{
|
|
const uint32_t tv_now = SDL_GetTicks();
|
|
if (multiplayer)
|
|
multi_do_frame(); // during long wait, keep packets flowing
|
|
if (!vsync)
|
|
SDL_Delay(1);
|
|
if (unlikely(start > tv_now))
|
|
start = tv_now;
|
|
if (unlikely(tv_now - start >= bound))
|
|
{
|
|
FrameStart = tv_now;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
}
|