ksys: Add VFR stopwatch utilities

data/uking_functions.csv

@@ -91891,10 +91891,10 @@
 0x00000071011c16a8,VFR::isSlowTime,68,_ZNK4ksys3VFR23hasCustomTimeMultiplierEv
 0x00000071011c16ec,VFR::setSlowTime,136,
 0x00000071011c1774,VFR::endSlowTime,120,
-0x00000071011c17ec,sub_71011C17EC,12,
-0x00000071011c17f8,sub_71011C17F8,184,
-0x00000071011c18b0,sub_71011C18B0,176,
-0x00000071011c1960,sub_71011C1960,200,
+0x00000071011c17ec,sub_71011C17EC,12,_ZN4ksys3VFR9StopwatchC1Ev
+0x00000071011c17f8,sub_71011C17F8,184,_ZN4ksys3VFR9StopwatchC1Ejj
+0x00000071011c18b0,sub_71011C18B0,176,_ZN4ksys3VFR9Stopwatch5startEjj
+0x00000071011c1960,sub_71011C1960,200,_ZN4ksys3VFR9StopwatchD1Ev
 0x00000071011c1a28,VFR::isField29Set,8,_ZNK4ksys3VFR19hasIntervalOverrideEv
 0x00000071011c1a30,VFR::x,8,_ZNK4ksys3VFR19getIntervalOverrideEv
 0x00000071011c1a38,sub_71011C1A38,44,

src/KingSystem/System/VFR.cpp

@@ -175,4 +175,30 @@ bool VFR::hasCustomTimeMultiplier() const {
     return false;
 }
 
+VFR::Stopwatch::Stopwatch() = default;
+
+VFR::Stopwatch::Stopwatch(u32 include_mask, u32 exclude_mask) : Stopwatch() {
+    start(include_mask, exclude_mask);
+}
+
+void VFR::Stopwatch::start(u32 include_mask, u32 exclude_mask) {
+    auto* vfr = VFR::instance();
+    if (!vfr)
+        return;
+
+    f32 duration;
+    const auto delta = vfr->setDeltaFromTimeMultipliers(&duration, include_mask, exclude_mask);
+    const auto time = vfr->getDeltaTime();
+    if (delta != time) {
+        mTimeDelta = duration;
+        if (delta > 0.0)
+            mTimeRate = time / delta;
+    }
+}
+
+VFR::Stopwatch::~Stopwatch() {
+    if (VFR::instance() && mTimeDelta > 0.0)
+        VFR::instance()->setDelta(mTimeDelta);
+}
+
 }  // namespace ksys

src/KingSystem/System/VFR.h

@@ -4,6 +4,7 @@
 #include <container/seadBuffer.h>
 #include <container/seadSafeArray.h>
 #include <heap/seadDisposer.h>
+#include <mc/seadCoreInfo.h>
 #include <prim/seadBitFlag.h>
 #include "KingSystem/Utils/Types.h"
 
@@ -30,6 +31,20 @@ public:
         f32 target_value = 1.0;
     };
 
+    struct Stopwatch {
+        Stopwatch();
+        Stopwatch(u32 include_mask, u32 exclude_mask);
+        ~Stopwatch();
+        Stopwatch(const Stopwatch&) = delete;
+        Stopwatch(Stopwatch&&) = delete;
+        auto operator=(const Stopwatch&) = delete;
+        auto operator=(Stopwatch&&) = delete;
+        void start(u32 include_mask, u32 exclude_mask);
+
+        f32 mTimeRate = 1.0;
+        f32 mTimeDelta = 0.0;
+    };
+
     void init(u32 interval, int num_speed_multipliers, sead::Heap* heap, u32 mask);
 
     void setIntervalOverride(u32 interval);
@@ -50,6 +65,9 @@ public:
     // TODO: requires ksys::Sound
     void resetTimeMultiplier(u32 idx);
 
+    f32 getDeltaTime(u32 core) const { return *mDeltaTimes[core]; }
+    f32 getDeltaTime() const { return getDeltaTime(sead::CoreInfo::getCurrentCoreId()); }
+
 private:
     struct TimeSpeedMultipliers : sead::Buffer<TimeSpeedMultiplier> {
         TimeSpeedMultipliers() {
@@ -59,6 +77,7 @@ private:
     };
 
     void setDelta(u32 core, f32 delta);
+    void setDelta(f32 delta) { setDelta(sead::CoreInfo::getCurrentCoreId(), delta); }
     void setDeltaFromTimeMultipliers(u32 core, const sead::BitFlag32& mask);
     void x_1();
     void copyAtoB();