Nullable fixes, use Texture2d resource for rendering directly.

DaggerFramework/Source/SceneGraph/Entities/Particles2d.cs

@@ -8,19 +8,28 @@ namespace DaggerFramework.SceneGraph
     public class Particles2d : Drawable2d
     {
         public int MaxParticles => _maxParticles;
+        public ParticleSettings Settings => _settings;
 
-        public void BeginEmit(ParticleSettings settings)
+        public Particles2d(ParticleSettings settings)
         {
             _settings = settings;
             _maxParticles = _settings.MaxParticles;
             _particleIndex = _maxParticles - 1;
-            InitializeParticles();
+
+            _particles = new Particle[_maxParticles];
         }
+
         public void Restart()
         {
             CleanupParticles();
-            InitializeParticles();
+
+            // Allocate a new particle array if max particles property got changed.
+            if (_maxParticles != _settings.MaxParticles)
+            {
+                _particles = new Particle[_maxParticles];
+            }
         }
+
         public override void OnDraw(Renderer renderer)
         {
             foreach (var particle in _particles)
@@ -72,11 +81,6 @@ namespace DaggerFramework.SceneGraph
             }
         }
 
-        private void InitializeParticles()
-        {
-            _particles = new Particle[_maxParticles];
-        }
-
         private void Emit()
         {
             Particle particle = _particles[_particleIndex];