From 234b5ff6a999d7d69cdcdf214e0c3984cdab11cf Mon Sep 17 00:00:00 2001
From: Fernando Sahmkow <fsahmkow27@gmail.com>
Date: Sun, 9 Feb 2020 16:53:22 -0400
Subject: Common: Implement WallClock Interface and implement a native clock
 for x64

---
 src/core/host_timing.cpp | 21 +++++++++------------
 src/core/host_timing.h   |  4 ++--
 2 files changed, 11 insertions(+), 14 deletions(-)

(limited to 'src/core')

diff --git a/src/core/host_timing.cpp b/src/core/host_timing.cpp
index d9514b2c5..ef9977b76 100644
--- a/src/core/host_timing.cpp
+++ b/src/core/host_timing.cpp
@@ -35,7 +35,11 @@ struct CoreTiming::Event {
     }
 };
 
-CoreTiming::CoreTiming() = default;
+CoreTiming::CoreTiming() {
+    Common::WallClock* wall = Common::CreateBestMatchingClock(Core::Timing::BASE_CLOCK_RATE, Core::Timing::CNTFREQ);
+    clock = std::unique_ptr<Common::WallClock>(wall);
+}
+
 CoreTiming::~CoreTiming() = default;
 
 void CoreTiming::ThreadEntry(CoreTiming& instance) {
@@ -46,7 +50,6 @@ void CoreTiming::Initialize() {
     event_fifo_id = 0;
     const auto empty_timed_callback = [](u64, s64) {};
     ev_lost = CreateEvent("_lost_event", empty_timed_callback);
-    start_time = std::chrono::steady_clock::now();
     timer_thread = std::make_unique<std::thread>(ThreadEntry, std::ref(*this));
 }
 
@@ -108,13 +111,11 @@ void CoreTiming::UnscheduleEvent(const std::shared_ptr<EventType>& event_type, u
 }
 
 u64 CoreTiming::GetCPUTicks() const {
-    std::chrono::nanoseconds time_now = GetGlobalTimeNs();
-    return Core::Timing::nsToCycles(time_now);
+    return clock->GetCPUCycles();
 }
 
 u64 CoreTiming::GetClockTicks() const {
-    std::chrono::nanoseconds time_now = GetGlobalTimeNs();
-    return Core::Timing::nsToClockCycles(time_now);
+    return clock->GetClockCycles();
 }
 
 void CoreTiming::ClearPendingEvents() {
@@ -174,15 +175,11 @@ void CoreTiming::Advance() {
 }
 
 std::chrono::nanoseconds CoreTiming::GetGlobalTimeNs() const {
-    sys_time_point current = std::chrono::steady_clock::now();
-    auto elapsed = current - start_time;
-    return std::chrono::duration_cast<std::chrono::nanoseconds>(elapsed);
+    return clock->GetTimeNS();
 }
 
 std::chrono::microseconds CoreTiming::GetGlobalTimeUs() const {
-    sys_time_point current = std::chrono::steady_clock::now();
-    auto elapsed = current - start_time;
-    return std::chrono::duration_cast<std::chrono::microseconds>(elapsed);
+    return clock->GetTimeUS();
 }
 
 } // namespace Core::Timing
diff --git a/src/core/host_timing.h b/src/core/host_timing.h
index 1d053a7fa..f04a150ee 100644
--- a/src/core/host_timing.h
+++ b/src/core/host_timing.h
@@ -17,12 +17,12 @@
 #include "common/spin_lock.h"
 #include "common/thread.h"
 #include "common/threadsafe_queue.h"
+#include "common/wall_clock.h"
 
 namespace Core::HostTiming {
 
 /// A callback that may be scheduled for a particular core timing event.
 using TimedCallback = std::function<void(u64 userdata, s64 cycles_late)>;
-using sys_time_point = std::chrono::time_point<std::chrono::steady_clock>;
 
 /// Contains the characteristics of a particular event.
 struct EventType {
@@ -112,7 +112,7 @@ private:
     static void ThreadEntry(CoreTiming& instance);
     void Advance();
 
-    sys_time_point start_time;
+    std::unique_ptr<Common::WallClock> clock;
 
     u64 global_timer = 0;
 
-- 
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