From 9a286691f43585248023db08a88e9c4144293148 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Kamil=20Trzci=C5=84ski?= <ayufan@ayufan.eu>
Date: Mon, 28 Nov 2022 10:14:05 +0100
Subject: [PATCH] Use high-precision timer for DeltaTime

---
 SteamController/Context.cs                 |  2 +-
 SteamController/Devices/SteamAction.cs     | 15 ++-------------
 SteamController/Devices/SteamController.cs | 11 +++++++++++
 3 files changed, 14 insertions(+), 14 deletions(-)

diff --git a/SteamController/Context.cs b/SteamController/Context.cs
index 1e64fae..2adbb1b 100644
--- a/SteamController/Context.cs
+++ b/SteamController/Context.cs
@@ -17,7 +17,7 @@ namespace SteamController
         public List<Profiles.Profile> Profiles { get; } = new List<Profiles.Profile>();
         public List<Managers.Manager> Managers { get; } = new List<Managers.Manager>();
 
-        public List<Profiles.Profile>? orderedProfiles;
+        private List<Profiles.Profile>? orderedProfiles;
 
         public bool RequestEnable { get; set; } = true;
         public bool RequestDesktopMode { get; set; } = true;
diff --git a/SteamController/Devices/SteamAction.cs b/SteamController/Devices/SteamAction.cs
index d3fe1e0..1a8241b 100644
--- a/SteamController/Devices/SteamAction.cs
+++ b/SteamController/Devices/SteamAction.cs
@@ -12,8 +12,6 @@ namespace SteamController.Devices
         /// This is action controlled by Lizard mode
         public bool LizardButton { get; internal set; }
         public bool LizardMouse { get; internal set; }
-        public DateTime LastUpdated { get; protected set; } = DateTime.Now;
-        public double DeltaTime { get; protected set; }
 
         internal abstract void Reset();
         internal abstract bool BeforeUpdate(byte[] buffer);
@@ -23,13 +21,6 @@ namespace SteamController.Devices
         {
         }
 
-        protected void UpdateTime()
-        {
-            var now = DateTime.Now;
-            DeltaTime = (now - LastUpdated).TotalSeconds;
-            LastUpdated = now;
-        }
-
         protected bool ValueCanBeUsed
         {
             get
@@ -202,7 +193,6 @@ namespace SteamController.Devices
         {
             rawLastValue = rawValue;
             rawValue = newValue;
-            UpdateTime();
 
             if (!rawLastValue && rawValue)
             {
@@ -330,7 +320,7 @@ namespace SteamController.Devices
                 case DeltaValueMode.AbsoluteTime:
                     if (Math.Abs(Value) < Deadzone)
                         return 0.0;
-                    value = (int)(Value * DeltaTime);
+                    value = (int)(Value * (Controller?.DeltaTime ?? 0.0));
                     break;
 
                 case DeltaValueMode.Delta:
@@ -343,7 +333,7 @@ namespace SteamController.Devices
                     value = Value - LastValue;
                     if (Math.Abs(Value) < MinChange)
                         return 0.0;
-                    value = (int)(value * DeltaTime);
+                    value = (int)(value * (Controller?.DeltaTime ?? 0.0));
                     break;
             }
 
@@ -364,7 +354,6 @@ namespace SteamController.Devices
         {
             rawLastValue = rawValue;
             rawValue = newValue;
-            UpdateTime();
 
             // first time pressed, reset value as this is a Pad
             if (ActiveButton is not null && ActiveButton.JustPressed())
diff --git a/SteamController/Devices/SteamController.cs b/SteamController/Devices/SteamController.cs
index 8979257..8ba9924 100644
--- a/SteamController/Devices/SteamController.cs
+++ b/SteamController/Devices/SteamController.cs
@@ -1,3 +1,4 @@
+using System.Diagnostics;
 using CommonHelpers;
 using hidapi;
 using PowerControl.External;
@@ -12,6 +13,9 @@ namespace SteamController.Devices
         private const int ReadTimeout = 50;
 
         private hidapi.HidDevice neptuneDevice;
+        private Stopwatch stopwatch = new Stopwatch();
+        private TimeSpan? lastUpdate;
+        public double DeltaTime { get; private set; }
 
         internal SteamController()
         {
@@ -20,6 +24,8 @@ namespace SteamController.Devices
 
             neptuneDevice = new hidapi.HidDevice(VendorID, ProductID, 64);
             neptuneDevice.OpenDevice();
+
+            stopwatch.Start();
         }
 
         public void Dispose()
@@ -42,6 +48,11 @@ namespace SteamController.Devices
 
         internal void BeforeUpdate()
         {
+            var ts = stopwatch.Elapsed;
+            DeltaTime = lastUpdate is not null ? (ts - lastUpdate.Value).TotalSeconds : 0.0;
+            DeltaTime = Math.Min(DeltaTime, 0.1); // max update is 100ms
+            lastUpdate = ts;
+
             LizardButtons = true;
             LizardMouse = true;