From 5b71591998bc9294f5444ac1c1f9c96772043bf7 Mon Sep 17 00:00:00 2001
From: Wojtek Figat <wojtek@figat.pl>
Date: Tue, 11 Jun 2024 11:37:49 +0200
Subject: [PATCH] Add option to disable particles preview in scene view and
 play only looping effects

#1767
---
 Source/Editor/Editor.cs                    | 1 +
 Source/Editor/Managed/ManagedEditor.h      | 1 +
 Source/Editor/Options/OptionsModule.cs     | 1 +
 Source/Editor/Options/VisualOptions.cs     | 7 +++++++
 Source/Engine/Particles/ParticleEffect.cpp | 8 +++++++-
 5 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/Source/Editor/Editor.cs b/Source/Editor/Editor.cs
index 12d222c4e..8af1bc9f4 100644
--- a/Source/Editor/Editor.cs
+++ b/Source/Editor/Editor.cs
@@ -1364,6 +1364,7 @@ namespace FlaxEditor
             public byte AutoReloadScriptsOnMainWindowFocus;
             public byte ForceScriptCompilationOnStartup;
             public byte UseAssetImportPathRelative;
+            public byte EnableParticlesPreview;
             public byte AutoRebuildCSG;
             public float AutoRebuildCSGTimeoutMs;
             public byte AutoRebuildNavMesh;
diff --git a/Source/Editor/Managed/ManagedEditor.h b/Source/Editor/Managed/ManagedEditor.h
index e51749e5f..5c7907d17 100644
--- a/Source/Editor/Managed/ManagedEditor.h
+++ b/Source/Editor/Managed/ManagedEditor.h
@@ -27,6 +27,7 @@ API_CLASS(Namespace="FlaxEditor", Name="Editor", NoSpawn, NoConstructor) class M
         byte AutoReloadScriptsOnMainWindowFocus = 1;
         byte ForceScriptCompilationOnStartup = 1;
         byte UseAssetImportPathRelative = 1;
+        byte EnableParticlesPreview = 1;
         byte AutoRebuildCSG = 1;
         float AutoRebuildCSGTimeoutMs = 50;
         byte AutoRebuildNavMesh = 1;
diff --git a/Source/Editor/Options/OptionsModule.cs b/Source/Editor/Options/OptionsModule.cs
index 5a7aa886f..d43af963e 100644
--- a/Source/Editor/Options/OptionsModule.cs
+++ b/Source/Editor/Options/OptionsModule.cs
@@ -192,6 +192,7 @@ namespace FlaxEditor.Options
             internalOptions.AutoReloadScriptsOnMainWindowFocus = (byte)(Options.General.AutoReloadScriptsOnMainWindowFocus ? 1 : 0);
             internalOptions.ForceScriptCompilationOnStartup = (byte)(Options.General.ForceScriptCompilationOnStartup ? 1 : 0);
             internalOptions.UseAssetImportPathRelative = (byte)(Options.General.UseAssetImportPathRelative ? 1 : 0);
+            internalOptions.EnableParticlesPreview = (byte)(Options.Visual.EnableParticlesPreview ? 1 : 0);
             internalOptions.AutoRebuildCSG = (byte)(Options.General.AutoRebuildCSG ? 1 : 0);
             internalOptions.AutoRebuildCSGTimeoutMs = Options.General.AutoRebuildCSGTimeoutMs;
             internalOptions.AutoRebuildNavMesh = (byte)(Options.General.AutoRebuildNavMesh ? 1 : 0);
diff --git a/Source/Editor/Options/VisualOptions.cs b/Source/Editor/Options/VisualOptions.cs
index 6de9c9716..4e94538e2 100644
--- a/Source/Editor/Options/VisualOptions.cs
+++ b/Source/Editor/Options/VisualOptions.cs
@@ -59,5 +59,12 @@ namespace FlaxEditor.Options
         [DefaultValue(true)]
         [EditorDisplay("Quality", "Enable MSAA For Debug Draw"), EditorOrder(500), Tooltip("Determines whether enable MSAA for DebugDraw primitives rendering. Helps with pixel aliasing but reduces performance.")]
         public bool EnableMSAAForDebugDraw { get; set; } = true;
+
+        /// <summary>
+        /// Gets or sets a value indicating whether show looping particle effects in Editor viewport to simulate in-game look.
+        /// </summary>
+        [DefaultValue(true)]
+        [EditorDisplay("Preview"), EditorOrder(1000)]
+        public bool EnableParticlesPreview { get; set; } = true;
     }
 }
diff --git a/Source/Engine/Particles/ParticleEffect.cpp b/Source/Engine/Particles/ParticleEffect.cpp
index 9fbab80b9..b4e05e362 100644
--- a/Source/Engine/Particles/ParticleEffect.cpp
+++ b/Source/Engine/Particles/ParticleEffect.cpp
@@ -446,15 +446,21 @@ void ParticleEffect::Update()
 #if USE_EDITOR
 
 #include "Editor/Editor.h"
+#include "Editor/Managed/ManagedEditor.h"
 
 void ParticleEffect::UpdateExecuteInEditor()
 {
     // Auto-play in Editor
-    if (!Editor::IsPlayMode && !_isStopped)
+    if (!Editor::IsPlayMode && !_isStopped && IsLooping && PlayOnStart && Editor::Managed->ManagedEditorOptions.EnableParticlesPreview)
     {
         _isPlaying = true;
         Update();
     }
+    else if (!Editor::IsPlayMode && _isPlaying)
+    {
+        _isPlaying = false;
+        ResetSimulation();
+    }
 }
 
 #endif