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Codechange: switch all video drivers to std::chrono for keeping time

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On all OSes we tested the std::chrono::steady_clock is of a high
enough resolution to do millisecond measurements, which is all we
need.

By accident, this fixes a Win32 driver bug, where we would never
hit our targets, as the resolution of the clock was too low to
do accurate millisecond measurements with (it was ~16ms resolution
instead).
This commit is contained in:
Patric Stout
2021-02-17 14:46:19 +01:00
committed by Patric Stout
parent d437445c67
commit 25f6851ca1
7 changed files with 44 additions and 101 deletions
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33
src/video/allegro_v.cpp
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@@ -445,34 +445,15 @@ void VideoDriver_Allegro::Stop()
if (--_allegro_instance_count == 0) allegro_exit();
}
#if defined(UNIX) || defined(__OS2__)
# include <sys/time.h> /* gettimeofday */
static uint32 GetTime()
{
struct timeval tim;
gettimeofday(&tim, nullptr);
return tim.tv_usec / 1000 + tim.tv_sec * 1000;
}
#else
static uint32 GetTime()
{
return GetTickCount();
}
#endif
void VideoDriver_Allegro::MainLoop()
{
uint32 cur_ticks = GetTime();
uint32 last_cur_ticks = cur_ticks;
uint32 next_tick = cur_ticks + MILLISECONDS_PER_TICK;
auto cur_ticks = std::chrono::steady_clock::now();
auto last_cur_ticks = cur_ticks;
auto next_tick = cur_ticks;
CheckPaletteAnim();
for (;;) {
uint32 prev_cur_ticks = cur_ticks; // to check for wrapping
InteractiveRandom(); // randomness
PollEvent();
@@ -491,11 +472,11 @@ void VideoDriver_Allegro::MainLoop()
_fast_forward = 0;
}
cur_ticks = GetTime();
if (cur_ticks >= next_tick || (_fast_forward && !_pause_mode) || cur_ticks < prev_cur_ticks) {
_realtime_tick += cur_ticks - last_cur_ticks;
cur_ticks = std::chrono::steady_clock::now();
if (cur_ticks >= next_tick || (_fast_forward && !_pause_mode)) {
_realtime_tick += std::chrono::duration_cast<std::chrono::milliseconds>(cur_ticks - last_cur_ticks).count();
last_cur_ticks = cur_ticks;
next_tick = cur_ticks + MILLISECONDS_PER_TICK;
next_tick = cur_ticks + std::chrono::milliseconds(MILLISECONDS_PER_TICK);
bool old_ctrl_pressed = _ctrl_pressed;