Added very basic particle system and rendering

Nuake/src/Scene/Systems/ParticleEmitter.cpp

@@ -0,0 +1,63 @@
+#include "ParticleEmitter.h"
+
+namespace Nuake
+{
+	ParticleEmitter::ParticleEmitter()
+	{
+		m_MT = std::mt19937(std::random_device()());
+		m_Random = std::uniform_real_distribution<float>(-Radius, Radius);
+	}
+
+	void ParticleEmitter::SpawnParticle()
+	{
+		const bool canSpawnParticle = Particles.size() < Amount;
+		if (!canSpawnParticle)
+		{
+			return;
+		}
+
+		const auto initialPosition = Vector3(m_Random(m_MT), m_Random(m_MT), m_Random(m_MT));
+		const auto initialVelocity = Vector3();
+		const auto initialColor = Color(1, 0, 0, 1); // TODO: Use color.
+		const float initialLife = Life;
+
+		Particles.push_back({
+			initialPosition,
+			initialVelocity,
+			initialColor,
+			initialLife
+		});
+	}
+
+	void ParticleEmitter::Update(Timestep ts)
+	{
+		std::vector<uint32_t> deletionQueue;
+		int i = 0;
+		for (auto& p : Particles)
+		{
+			p.Life -= ts;
+
+			if (p.Life <= 0.0f) // The particle has died.
+			{
+				deletionQueue.push_back(i);
+			}
+
+			i++;
+		}
+
+		// Delete all dead particles.
+		int shiftOffset = 0;
+		for (int d = deletionQueue.size() - 1; d > 0; d--)
+		{
+			// Erase shifts the elements
+			const auto it = d;
+			Particles.erase(Particles.begin() + it);
+		}
+
+		for (auto& p : Particles)
+		{
+			p.Velocity += Gravity * static_cast<float>(ts);
+			p.Position += p.Velocity * static_cast<float>(ts);
+		}
+	}
+}