add more comments/docstrings on first 58 files, try new windows-specific framelimiting (#1134)

* cleanup * type * link against a library
2026-07-11 23:30:16 -04:00 · 2022-02-05 16:30:50 -05:00
parent 738db287b4
commit f142f46045
36 changed files with 545 additions and 493 deletions
@@ -0,0 +1,77 @@
+#include "FrameLimiter.h"
+#include <thread>
+
+double FrameLimiter::round_to_nearest_60fps(double current) {
+  double one_frame = 1.f / 60.f;
+  int frames_missed = (current / one_frame);  // rounds down
+  if (frames_missed > 4) {
+    frames_missed = 4;
+  }
+  return (frames_missed + 1) * one_frame;
+}
+
+#ifdef __linux__
+
+FrameLimiter::FrameLimiter() {}
+
+FrameLimiter::~FrameLimiter() {}
+
+void FrameLimiter::run(double target_fps,
+                       bool experimental_accurate_lag,
+                       bool do_sleeps,
+                       double engine_time) {
+  double target_seconds;
+  if (experimental_accurate_lag) {
+    target_seconds = round_to_nearest_60fps(engine_time);
+  } else {
+    target_seconds = 1.f / target_fps;
+  }
+  double remaining_time = target_seconds - m_timer.getSeconds();
+
+  if (do_sleeps && remaining_time > 0.001) {
+    std::this_thread::sleep_for(std::chrono::microseconds(int((remaining_time - 0.001) * 1e6)));
+  }
+
+  while (remaining_time > 0) {
+    remaining_time = target_seconds - m_timer.getSeconds();
+  }
+
+  m_timer.start();
+}
+
+#else
+
+#include <Windows.h>
+
+FrameLimiter::FrameLimiter() {
+  timeBeginPeriod(1);
+}
+
+FrameLimiter::~FrameLimiter() {
+  timeEndPeriod(0);
+}
+
+void FrameLimiter::run(double target_fps,
+                       bool experimental_accurate_lag,
+                       bool do_sleeps,
+                       double engine_time) {
+  double target_seconds;
+  if (experimental_accurate_lag) {
+    target_seconds = round_to_nearest_60fps(engine_time);
+  } else {
+    target_seconds = 1.f / target_fps;
+  }
+  double remaining_time = target_seconds - m_timer.getSeconds();
+
+  if (do_sleeps && remaining_time > 0.001) {
+    Sleep((remaining_time * 1000) - 1);
+  }
+
+  while (remaining_time > 0) {
+    remaining_time = target_seconds - m_timer.getSeconds();
+  }
+
+  m_timer.start();
+}
+
+#endif