From ad491b5570ec428d0d87d56426b03125e2ca5220 Mon Sep 17 00:00:00 2001
From: EliEron <subanimehd@gmail.com>
Date: Mon, 25 Jan 2021 00:02:00 +0100
Subject: [PATCH] Prevent Display Sleep on Windows while running a game (#1850)

Co-authored-by: EliEron <example@example.com>
---
 Ryujinx.Common/System/DisplaySleep.cs   | 35 +++++++++++++++++++++++++
 Ryujinx/Ui/MainWindow.cs                |  3 +++
 Ryujinx/Ui/Windows/SettingsWindow.glade |  3 ++-
 3 files changed, 40 insertions(+), 1 deletion(-)
 create mode 100644 Ryujinx.Common/System/DisplaySleep.cs

diff --git a/Ryujinx.Common/System/DisplaySleep.cs b/Ryujinx.Common/System/DisplaySleep.cs
new file mode 100644
index 000000000..77f9dd75b
--- /dev/null
+++ b/Ryujinx.Common/System/DisplaySleep.cs
@@ -0,0 +1,35 @@
+using System;
+using System.Runtime.InteropServices;
+
+namespace Ryujinx.Common.System
+{
+    public class DisplaySleep
+    {
+        [Flags]
+        enum EXECUTION_STATE : uint
+        {
+            ES_CONTINUOUS = 0x80000000,
+            ES_DISPLAY_REQUIRED = 0x00000002,
+            ES_SYSTEM_REQUIRED = 0x00000001
+        }
+
+        [DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
+        static extern EXECUTION_STATE SetThreadExecutionState(EXECUTION_STATE esFlags);
+
+        static public void Prevent()
+        {
+            if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
+            {
+                SetThreadExecutionState(EXECUTION_STATE.ES_CONTINUOUS | EXECUTION_STATE.ES_SYSTEM_REQUIRED | EXECUTION_STATE.ES_DISPLAY_REQUIRED);
+            }
+        }
+        
+        static public void Restore()
+        {
+            if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
+            {
+                SetThreadExecutionState(EXECUTION_STATE.ES_CONTINUOUS);  
+            }
+        }
+    }
+}
diff --git a/Ryujinx/Ui/MainWindow.cs b/Ryujinx/Ui/MainWindow.cs
index 1c847f4a6..3f2c2fb8a 100644
--- a/Ryujinx/Ui/MainWindow.cs
+++ b/Ryujinx/Ui/MainWindow.cs
@@ -554,6 +554,8 @@ namespace Ryujinx.Ui
                 _windowsMultimediaTimerResolution = new WindowsMultimediaTimerResolution(1);
             }
 
+            DisplaySleep.Prevent();
+
             GlRendererWidget = new GlRenderer(_emulationContext, ConfigurationState.Instance.Logger.GraphicsDebugLevel);
 
             Application.Invoke(delegate
@@ -604,6 +606,7 @@ namespace Ryujinx.Ui
 
                 _windowsMultimediaTimerResolution?.Dispose();
                 _windowsMultimediaTimerResolution = null;
+                DisplaySleep.Restore();
 
                 _viewBox.Remove(GlRendererWidget);
                 _viewBox.Add(_gameTableWindow);
diff --git a/Ryujinx/Ui/Windows/SettingsWindow.glade b/Ryujinx/Ui/Windows/SettingsWindow.glade
index 97a88b229..6457ecfeb 100644
--- a/Ryujinx/Ui/Windows/SettingsWindow.glade
+++ b/Ryujinx/Ui/Windows/SettingsWindow.glade
@@ -1299,6 +1299,7 @@
                                       <object class="GtkLabel">
                                         <property name="visible">True</property>
                                         <property name="can-focus">False</property>
+                                        <property name="tooltip-text" translatable="yes">Change System Time</property>
                                         <property name="halign">end</property>
                                         <property name="label" translatable="yes">System Time:</property>
                                       </object>
@@ -1509,7 +1510,7 @@
                                   <object class="GtkLabel">
                                     <property name="visible">True</property>
                                     <property name="can-focus">False</property>
-                                    <property name="tooltip-text" translatable="yes">Change System Region</property>
+                                    <property name="tooltip-text" translatable="yes">Change Audio Backend</property>
                                     <property name="halign">end</property>
                                     <property name="margin-right">5</property>
                                     <property name="label" translatable="yes">Audio Backend: </property>