Add UpdateCameraOnResize processor

- GFX initialization moved to Game.OnLoad
- Renderer processor doesn't update Camera anymore
- Rename MainCamera => FullscreenCamera
- Add Universe.Has method

src/Immersion/Program.cs

@@ -34,7 +34,7 @@ public Program()
 		protected override void OnLoad()
 		{
 			base.OnLoad();
-			var (mainCamera, _) = GetAll<MainCamera>().First();
+			var (mainCamera, _) = GetAll<FullscreenCamera>().First();
 			Set(mainCamera, (Transform)Matrix4x4.CreateTranslation(0, 26, 0));
 
 			var meshLoader = Processors.GetOrThrow<MeshLoader>();

src/gaemstone.Client/Components/Camera.cs

@@ -9,12 +9,12 @@ public struct Camera
 		public Matrix4x4 Matrix;
 	}
 
-	public struct MainCamera
+	public struct FullscreenCamera
 	{
-		public static readonly MainCamera Default2D
-			= new MainCamera { NearPlane = -100.0F, FarPlane = 100.0F };
-		public static readonly MainCamera Default3D
-			= new MainCamera { FieldOfView = 80.0F, NearPlane = 0.1F, FarPlane = 100.0F };
+		public static readonly FullscreenCamera Default2D
+			= new FullscreenCamera { NearPlane = -100.0F, FarPlane = 100.0F };
+		public static readonly FullscreenCamera Default3D
+			= new FullscreenCamera { FieldOfView = 80.0F, NearPlane = 0.1F, FarPlane = 100.0F };
 
 		public float FieldOfView;
 		public float NearPlane, FarPlane;

src/gaemstone.Client/Game.cs

@@ -1,3 +1,4 @@
+using System;
 using System.Drawing;
 using System.IO;
 using System.Numerics;
@@ -30,7 +31,7 @@ public Game()
 
 			Components.AddStore(new PackedArrayStore<Transform>());
 			Components.AddStore(new PackedArrayStore<Camera>());
-			Components.AddStore(new PackedArrayStore<MainCamera>());
+			Components.AddStore(new PackedArrayStore<FullscreenCamera>());
 			Components.AddStore(new PackedArrayStore<IndexedMesh>());
 			Components.AddStore(new PackedArrayStore<Texture>());
 		}
@@ -43,16 +44,18 @@ public void Run()
 
 		protected virtual void OnLoad()
 		{
-			var mainCamera = Entities.New();
-			Set(mainCamera, (Transform)Matrix4x4.Identity);
-			Set(mainCamera, MainCamera.Default3D);
+			GFX.Initialize();
+			GFX.OnDebugOutput += (source, type, id, severity, message) =>
+				Console.WriteLine($"[GLDebug] [{severity}] {type}/{id}: {message}");
 
-			// TODO: This currently has to sit exactly here.
-			//       Renderer requires MainCamera, and it initializes GFX,
-			//       which is required for MeshLoader to create meshes.
 			Processors.Start<Renderer>();
 			Processors.Start<MeshLoader>();
+			Processors.Start<UpdateCameraOnResize>();
 			Processors.Start<CameraController>();
+
+			var mainCamera = Entities.New();
+			Set(mainCamera, (Transform)Matrix4x4.Identity);
+			Set(mainCamera, FullscreenCamera.Default3D);
 		}
 
 		protected virtual void OnClosing()

src/gaemstone.Client/Graphics/Renderer.cs

@@ -14,7 +14,7 @@ public class Renderer : IProcessor
 	{
 		private Game _game = null!;
 		private IComponentStore<Camera>      _cameraStore     = null!;
-		private IComponentStore<MainCamera>  _mainCameraStore = null!;
+		private IComponentStore<FullscreenCamera>  _mainCameraStore = null!;
 		private IComponentStore<Transform>   _transformStore  = null!;
 		private IComponentStore<IndexedMesh> _meshStore       = null!;
 		private IComponentStore<Texture>     _textureStore    = null!;
@@ -28,18 +28,14 @@ public void OnLoad(Universe universe)
 		{
 			_game = (Game)universe;
 			_cameraStore     = universe.Components.GetStore<Camera>();
-			_mainCameraStore = universe.Components.GetStore<MainCamera>();
+			_mainCameraStore = universe.Components.GetStore<FullscreenCamera>();
 			_transformStore  = universe.Components.GetStore<Transform>();
 			_meshStore       = universe.Components.GetStore<IndexedMesh>();
 			_textureStore    = universe.Components.GetStore<Texture>();
 
 			_game.Window.Resize += OnWindowResize;
 			_game.Window.Render += OnWindowRender;
 
-			GFX.Initialize();
-			GFX.OnDebugOutput += (source, type, id, severity, message) =>
-				Console.WriteLine($"[GLDebug] [{severity}] {type}/{id}: {message}");
-
 			var vertexShaderSource   = _game.GetResourceAsString("default.vs.glsl");
 			var fragmentShaderSource = _game.GetResourceAsString("default.fs.glsl");
 

src/gaemstone.Client/Processors/CameraController.cs

@@ -100,7 +100,7 @@ private void OnKeyUp(IKeyboard keyboard, Key key, int code)
 
 		public void OnUpdate(double delta)
 		{
-			var (mainCamera, _) = _game.GetAll<MainCamera>().First();
+			var (mainCamera, _) = _game.GetAll<FullscreenCamera>().First();
 			var transform = _game.Get<Transform>(mainCamera);
 
 			var xMovement = -_mouseMoved.X * (float)delta / 100;

src/gaemstone.Client/Processors/UpdateCameraOnResize.cs

@@ -0,0 +1,50 @@
+using System;
+using System.Drawing;
+using System.Numerics;
+using gaemstone.Client.Components;
+using gaemstone.Common.ECS;
+using gaemstone.Common.ECS.Processors;
+
+namespace gaemstone.Client.Graphics
+{
+	public class UpdateCameraOnResize
+		: IProcessor
+	{
+		private Game _game = null!;
+		private bool _update;
+
+		public void OnLoad(Universe universe)
+		{
+			_game = (Game)universe;
+			_game.Window.Resize += OnWindowResize;
+			_update = true;
+		}
+
+		public void OnUnload()
+			=> _game.Window.Resize -= OnWindowResize;
+
+		public void OnWindowResize(Size size)
+			=> _update = true;
+
+		public void OnUpdate(double delta)
+		{
+			var size = _game.Window.Size;
+			foreach (var (entity, fsCamera) in _game.GetAll<FullscreenCamera>()) {
+				// Only update cameras when _update is true, or
+				// entity doesn't yet have a Camera component.
+				if (!_update && _game.Has<Camera>(entity)) continue;
+
+				_game.Set(entity, new Camera {
+					Viewport = new Rectangle(Point.Empty, size),
+					Matrix   = fsCamera.IsOrthographic
+						? Matrix4x4.CreateOrthographic(size.Width, size.Height,
+							fsCamera.NearPlane, fsCamera.FarPlane)
+						: Matrix4x4.CreatePerspectiveFieldOfView(
+							fsCamera.FieldOfView * MathF.PI / 180, // Degrees => Radians
+							(float)size.Width / size.Height,       // Aspect Ratio
+							fsCamera.NearPlane, fsCamera.FarPlane)
+				});
+			}
+		}
+	}
+}

src/gaemstone.Common/ECS/Universe.cs

@@ -26,6 +26,13 @@ public T Get<T>(Entity entity)
 			return store.Get(entity.ID);
 		}
 
+		public bool Has<T>(Entity entity)
+		{
+			if (!Entities.IsAlive(entity))
+				throw new ArgumentException($"{entity} is not alive");
+			return Components.GetStore<T>()?.TryGet(entity.ID, out _) ?? false;
+		}
+
 		public void Set<T>(Entity entity, T value)
 		{
 			if (!Entities.IsAlive(entity))