Camera.cs

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using Engine;
using Engine.Graphics;
 
namespace Game {
    public abstract class Camera {
        public GameWidget GameWidget { get; set; }
 
        public VrEye? Eye { get; set; }
 
        public abstract Vector3 ViewPosition { get; }
 
        public abstract Vector3 ViewDirection { get; }
 
        public abstract Vector3 ViewUp { get; }
 
        public abstract Vector3 ViewRight { get; }
 
        public abstract Matrix ViewMatrix { get; }
 
        public abstract Matrix InvertedViewMatrix { get; }
 
        public abstract Matrix ProjectionMatrix { get; }
 
        public abstract Matrix ScreenProjectionMatrix { get; }
 
        public abstract Matrix InvertedProjectionMatrix { get; }
 
        public abstract Matrix ViewProjectionMatrix { get; }
 
        public abstract Vector2 ViewportSize { get; }
 
        public abstract Matrix ViewportMatrix { get; }
 
        public abstract BoundingFrustum ViewFrustum { get; }
 
        public abstract bool UsesMovementControls { get; }
 
        public abstract bool IsEntityControlEnabled { get; }
 
        public Camera(GameWidget gameWidget) => GameWidget = gameWidget;
 
        public Vector3 WorldToScreen(Vector3 worldPoint, Matrix worldMatrix) =>
            new Viewport(0, 0, Window.Size.X, Window.Size.Y).Project(worldPoint, ScreenProjectionMatrix, ViewMatrix, worldMatrix);
 
        public Vector3 ScreenToWorld(Vector3 screenPoint, Matrix worldMatrix) =>
            new Viewport(0, 0, Window.Size.X, Window.Size.Y).Unproject(screenPoint, ScreenProjectionMatrix, ViewMatrix, worldMatrix);
 
        public virtual void Activate(Camera previousCamera) { }
 
        public abstract void Update(float dt);
        public virtual void PrepareForDrawing() { }
    }
}