Add new particles demo (Space battle)

examples/Particles/Common.hpp

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+#pragma once
+
+#ifndef NAZARA_EXAMPLES_PARTICLES_COMMON_HPP
+#define NAZARA_EXAMPLES_PARTICLES_COMMON_HPP
+
+#include <Nazara/Core/Clock.hpp>
+#include <Nazara/Graphics/AbstractBackground.hpp>
+#include <Nazara/Graphics/TextSprite.hpp>
+#include <Nazara/Renderer/RenderWindow.hpp>
+#include <NDK/Components/ParticleGroupComponent.hpp>
+#include <NDK/EntityOwner.hpp>
+#include <NDK/StateMachine.hpp>
+#include <NDK/World.hpp>
+#include <memory>
+#include <random>
+#include <vector>
+
+class ParticleDemo;
+
+struct ExampleShared
+{
+	mutable std::mt19937 randomGen;
+	std::vector<std::shared_ptr<ParticleDemo>> demos;
+	Nz::RenderWindow* target;
+	Nz::TextSpriteRef demoName;
+	Nz::TextSpriteRef fpsCount;
+	Nz::TextSpriteRef particleCount;
+	Ndk::EntityHandle viewer2D;
+	Ndk::EntityHandle viewer3D;
+	Ndk::WorldHandle world2D;
+	Ndk::WorldHandle world3D;
+};
+
+class ParticleDemo : public Ndk::State
+{
+	public:
+		ParticleDemo(const Nz::String& name, const ExampleShared& exampleShared);
+		~ParticleDemo() = default;
+
+		void Enter(Ndk::StateMachine& fsm) override;
+		void Leave(Ndk::StateMachine& fsm) override;
+
+		bool Update(Ndk::StateMachine& fsm, float elapsedTime) override;
+
+	protected:
+		const ExampleShared& m_shared;
+
+		void RegisterEntity(const Ndk::EntityHandle& entity);
+		void RegisterParticleGroup(const Ndk::EntityHandle& entity);
+
+	private:
+		std::size_t m_index;
+		std::vector<Ndk::EntityOwner> m_entities;
+		std::vector<Ndk::EntityOwner> m_particleGroups;
+		Nz::BackgroundRef m_oldBackground2D;
+		Nz::BackgroundRef m_oldBackground3D;
+		Nz::Clock m_updateClock;
+		Nz::String m_name;
+		unsigned int m_fpsCounter;
+
+		static std::size_t s_demoIndex;
+};
+
+#endif // NAZARA_EXAMPLES_PARTICLES_COMMON_HPP