core_timing: Make GetGlobalTimeUs() return std::chrono::microseconds

Enforces the time unit being returned and also allows using the standard
time utilities to manipulate it.

1 files changed, 6 insertions, 7 deletions

diff --git a/src/core/perf_stats.cpp b/src/core/perf_stats.cpp
index 5f53b16d3..22be6d712 100644
--- a/src/core/perf_stats.cpp
+++ b/src/core/perf_stats.cpp
@@ -40,22 +40,21 @@ void PerfStats::EndGameFrame() {
     game_frames += 1;
 }
 
-PerfStats::Results PerfStats::GetAndResetStats(u64 current_system_time_us) {
+PerfStats::Results PerfStats::GetAndResetStats(microseconds current_system_time_us) {
     std::lock_guard<std::mutex> lock(object_mutex);
 
-    auto now = Clock::now();
+    const auto now = Clock::now();
     // Walltime elapsed since stats were reset
-    auto interval = duration_cast<DoubleSecs>(now - reset_point).count();
+    const auto interval = duration_cast<DoubleSecs>(now - reset_point).count();
 
-    auto system_us_per_second =
-        static_cast<double>(current_system_time_us - reset_point_system_us) / interval;
+    const auto system_us_per_second = (current_system_time_us - reset_point_system_us) / interval;
 
     Results results{};
     results.system_fps = static_cast<double>(system_frames) / interval;
     results.game_fps = static_cast<double>(game_frames) / interval;
     results.frametime = duration_cast<DoubleSecs>(accumulated_frametime).count() /
                         static_cast<double>(system_frames);
-    results.emulation_speed = system_us_per_second / 1'000'000.0;
+    results.emulation_speed = system_us_per_second.count() / 1'000'000.0;
 
     // Reset counters
     reset_point = now;
@@ -74,7 +73,7 @@ double PerfStats::GetLastFrameTimeScale() {
     return duration_cast<DoubleSecs>(previous_frame_length).count() / FRAME_LENGTH;
 }
 
-void FrameLimiter::DoFrameLimiting(u64 current_system_time_us) {
+void FrameLimiter::DoFrameLimiting(microseconds current_system_time_us) {
     // Max lag caused by slow frames. Can be adjusted to compensate for too many slow frames. Higher
     // values increase the time needed to recover and limit framerate again after spikes.
     constexpr microseconds MAX_LAG_TIME_US = 25ms;