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Code Issues 144 Wiki Activity

fix: fpslimit paced in integer clock ticks, FPS shown counts the wait (eu07/maszyna#416)

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The limiter slept off the rest of each frame with sleep_for() given a float
duration. MSVC adds that to steady_clock::now() in float nanoseconds, so after
a few hours of system uptime the wake-up time is rounded to tens of ms: at
95 h uptime fpslimit 60 had no effect at all and fpslimit 30 gave ~22 fps, in
the full and the legacy renderer alike.

frame_pacer now schedules frames on a fixed cadence in steady_clock ticks and
the loop waits with sleep_until; an overshooting wait is made up in the next
frame. The FPS shown and the motion blur use the new mainloop_period stopwatch
(frame start to frame start, wait included); the targetfps/fpsaverage
draw-range controllers keep reading the work time as before.

(eu07/maszyna#416)
This commit is contained in:
jerrrrycho
2026-11-07 18:47:41 +01:00
parent 939e42b611
commit e8c4f3592e
6 changed files with 192 additions and 9 deletions
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13
application/application.cpp
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@@ -28,6 +28,7 @@ http://mozilla.org/MPL/2.0/.
#include "utilities/translation.h"
#include "vehicle/Train.h"
#include "utilities/Timer.h"
#include "utilities/framepacer.h"
#include "utilities/dictionary.h"
#include "version_info.h"
#include <chrono>
@@ -479,9 +480,14 @@ bool eu07_application::is_client() const
int eu07_application::run()
{
auto frame{0};
frame_pacer framepacer;
Timer::subsystem.mainloop_period.start();
// main application loop
while (!glfwWindowShouldClose(m_windows.front()) && !m_modestack.empty())
{
// the time from one frame's start to the next, the wait for fpslimit included
Timer::subsystem.mainloop_period.stop();
Timer::subsystem.mainloop_period.start();
Timer::subsystem.mainloop_total.start();
glfwPollEvents();
@@ -641,10 +647,11 @@ int eu07_application::run()
if (m_network)
m_network->update();
auto const frametime{Timer::subsystem.mainloop_total.stop()};
if (Global.minframetime.count() != 0.0f && (Global.minframetime - frametime).count() > 0.0f)
Timer::subsystem.mainloop_total.stop();
// fpslimit: wait for the next frame's slot (eu07/maszyna#416)
if (auto const nextframe{framepacer.next_frame(frame_pacer::clock::now(), Global.minframetime)})
{
std::this_thread::sleep_for(Global.minframetime - frametime);
std::this_thread::sleep_until(*nextframe);
}
}
// Handled by application.exit