Add InputLatencyMs stat to ProfilingTools

Source/Engine/Graphics/GPUDevice.cpp

@@ -753,6 +753,8 @@ void GPUDevice::DrawEnd()
     }
 #if COMPILE_WITH_PROFILER
     const double presentEnd = Platform::GetTimeSeconds();
+    extern double LastInputLatency, LastInputReadTime;
+    LastInputLatency = (float)(presentEnd - LastInputReadTime);
     ProfilerGPU::OnPresentTime((float)((presentEnd - presentStart) * 1000.0));
 #endif
     GetMainContext()->OnPresent();

Source/Engine/Input/Input.cpp

@@ -50,6 +50,8 @@ namespace
     InputDevice::EventQueue InputEvents;
 }
 
+double LastInputReadTime = 0;
+
 class InputService : public EngineService
 {
 public:
@@ -860,6 +862,7 @@ void InputService::Update()
     const auto frame = Time::Update.TicksCount;
     const auto dt = Time::Update.UnscaledDeltaTime.GetTotalSeconds();
     InputEvents.Clear();
+    LastInputReadTime = Platform::GetTimeSeconds();
 
     // If application has no user focus then simply clear the state
     if (!Engine::HasFocus)

Source/Engine/Profiler/ProfilingTools.cpp

@@ -29,6 +29,7 @@ public:
 };
 
 ProfilingToolsService ProfilingToolsServiceInstance;
+double LastInputLatency = 0;
 
 void ProfilingToolsService::Update()
 {
@@ -52,6 +53,8 @@ void ProfilingToolsService::Update()
         float presentTime;
         ProfilerGPU::GetLastFrameData(stats.DrawGPUTimeMs, presentTime, stats.DrawStats);
         stats.DrawCPUTimeMs = Math::Max(stats.DrawCPUTimeMs - presentTime, 0.0f); // Remove swapchain present wait time to exclude from drawing on CPU
+
+        stats.InputLatencyMs = (float)(LastInputLatency * 1000.0);
     }
 
     // Extract CPU profiler events

Source/Engine/Profiler/ProfilingTools.h

@@ -81,6 +81,11 @@ public:
         /// </summary>
         API_FIELD() float DrawGPUTimeMs;
 
+        /// <summary>
+        /// The time between player inputs reading and frame presentation to display (in milliseconds).
+        /// </summary>
+        API_FIELD() float InputLatencyMs;
+
         /// <summary>
         /// The last rendered frame stats.
         /// </summary>