From 8bc5e618b196b2ac7bba106b088c9432874189e6 Mon Sep 17 00:00:00 2001
From: Lynix <lynix680@gmail.com>
Date: Sun, 14 Aug 2016 17:56:01 +0200
Subject: [PATCH] SDK/System: Add possibility to disable systems without
 destroying them

Former-commit-id: d72fc2252c8c55e0ef93aa28592fdf734e187d64 [formerly 84c57abb22494dbc67a02db65dc39e282fab0ec3] [formerly 4b302cfc908f0ddfa45facdf707199a1a41a98d1 [formerly a971f3d0eb400aabe9695613ca63672b0dbaeec2]]
Former-commit-id: 3e03a4cd321c860dd3e264302839c5eb05bd2a85 [formerly 7db586c2246267f71fd54f4feb2c0b911e8c6387]
Former-commit-id: aa53d5f6f7ca2428d9a76b6e4e1b6785ce4b1c1f
---
 SDK/include/NDK/BaseSystem.hpp |  5 +++++
 SDK/include/NDK/BaseSystem.inl | 16 ++++++++++++++++
 2 files changed, 21 insertions(+)

diff --git a/SDK/include/NDK/BaseSystem.hpp b/SDK/include/NDK/BaseSystem.hpp
index 8e828149d..969f2b773 100644
--- a/SDK/include/NDK/BaseSystem.hpp
+++ b/SDK/include/NDK/BaseSystem.hpp
@@ -27,6 +27,8 @@ namespace Ndk
 			BaseSystem(BaseSystem&&) noexcept = default;
 			virtual ~BaseSystem();
 
+			inline void Enable(bool enable = true);
+
 			virtual BaseSystem* Clone() const = 0;
 
 			bool Filters(const Entity* entity) const;
@@ -36,6 +38,8 @@ namespace Ndk
 			inline float GetUpdateRate() const;
 			inline World& GetWorld() const;
 
+			inline bool IsEnabled() const;
+
 			inline bool HasEntity(const Entity* entity) const;
 
 			inline void SetUpdateRate(float updatePerSecond);
@@ -86,6 +90,7 @@ namespace Ndk
 			Nz::Bitset<> m_requiredComponents;
 			SystemIndex m_systemIndex;
 			World* m_world;
+			bool m_updateEnabled;
 			float m_updateCounter;
 			float m_updateRate;
 
diff --git a/SDK/include/NDK/BaseSystem.inl b/SDK/include/NDK/BaseSystem.inl
index 0c2811ac0..490b32e76 100644
--- a/SDK/include/NDK/BaseSystem.inl
+++ b/SDK/include/NDK/BaseSystem.inl
@@ -2,12 +2,14 @@
 // This file is part of the "Nazara Development Kit"
 // For conditions of distribution and use, see copyright notice in Prerequesites.hpp
 
+#include <NDK/BaseSystem.hpp>
 #include <Nazara/Core/Error.hpp>
 #include <type_traits>
 
 namespace Ndk
 {
 	inline BaseSystem::BaseSystem(SystemIndex systemId) :
+	m_updateEnabled(true),
 	m_systemIndex(systemId)
 	{
 		SetUpdateRate(30);
@@ -17,11 +19,17 @@ namespace Ndk
 	m_excludedComponents(system.m_excludedComponents),
 	m_requiredComponents(system.m_requiredComponents),
 	m_systemIndex(system.m_systemIndex),
+	m_updateEnabled(system.m_updateEnabled),
 	m_updateCounter(0.f),
 	m_updateRate(system.m_updateRate)
 	{
 	}
 
+	inline void BaseSystem::Enable(bool enable)
+	{
+		m_updateEnabled = enable;
+	}
+
 	inline const std::vector<EntityHandle>& BaseSystem::GetEntities() const
 	{
 		return m_entities;
@@ -42,6 +50,11 @@ namespace Ndk
 		return *m_world;
 	}
 
+	inline bool BaseSystem::IsEnabled() const
+	{
+		return m_updateEnabled;
+	}
+
 	inline bool BaseSystem::HasEntity(const Entity* entity) const
 	{
 		if (!entity)
@@ -58,6 +71,9 @@ namespace Ndk
 
 	inline void BaseSystem::Update(float elapsedTime)
 	{
+		if (!IsEnabled())
+			return;
+
 		if (m_updateRate > 0.f)
 		{
 			m_updateCounter += elapsedTime;