unsuccessful experimentation

src/engine/Shared.h

@@ -1,6 +1,60 @@
 #pragma once
+#include "bx/timer.h"
 #include <cstdint>
 
+#define START_PERF() int64_t __perfStart = bx::getHPCounter();
+#define END_PERF(counters, idx, frame) counters[(int32_t)idx].Write(bx::getHPCounter() - __perfStart, frame);
+
+enum class PerfCounterType
+{
+    WindowEvents,
+    GameDelta,
+    COUNT
+};
+
+struct PerfCounter
+{
+    static constexpr int32_t TimeWindow = 128;
+    int64_t Times[TimeWindow]{0};
+    void Write(int64_t value, uint64_t frameCounter)
+    {
+        Times[frameCounter % TimeWindow] = value;
+    }
+    float GetAverage()
+    {
+        int64_t sum = 0;
+        for (int32_t i = 0; i < TimeWindow; ++i)
+        {
+            sum += Times[i];
+        }
+        return (double)sum / bx::getHPFrequency();
+    }
+    float GetMin()
+    {
+        int64_t min = INT64_MAX;
+        for (int32_t i = 0; i < TimeWindow; ++i)
+        {
+            if (Times[i] < min)
+            {
+                min = Times[i];
+            }
+        }
+        return (double)min / bx::getHPFrequency();
+    }
+    float GetMax()
+    {
+        int64_t max = 0;
+        for (int32_t i = 0; i < TimeWindow; ++i)
+        {
+            if (Times[i] > max)
+            {
+                max = Times[i];
+            }
+        }
+        return (double)max / bx::getHPFrequency();
+    }
+};
+
 struct SharedWindowData
 {
     void* Handle = nullptr;
@@ -12,6 +66,8 @@ struct SharedWindowData
     bool LastHeldMouseButtons[8]{false};
     float MouseDeltaX = 0.0f;
     float MouseDeltaY = 0.0f;
+    uint64_t FrameCounter = 0;
+    PerfCounter PerfCounters[(int32_t)PerfCounterType::COUNT] = {0};
 };
 
 struct FileChangeNotification
@@ -39,9 +95,9 @@ struct GameData
 
 struct SharedData
 {
+    GameData Game;
     SharedDevData Dev;
     SharedWindowData Window;
-    GameData Game;
 };
 
 typedef void (*Startup)(SharedData& shared);