Kav/Lights/PointLight.cs

using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using System;

namespace Kav
{
    public sealed class PointLight : IDisposable
    {
        public Vector3 Position { get; }
        public Color Color { get; }
        public float Radius { get; }

        public BoundingSphere BoundingSphere { get; }

        public RenderTargetCube ShadowMap { get; }

        public PointLight(
            GraphicsDevice graphicsDevice,
            Vector3 position, 
            Color color, 
            float radius,
            int shadowMapSize
        ) {
            Position = position;
            Color = color;
            Radius = radius;

            BoundingSphere = new BoundingSphere(position, Radius);

            ShadowMap = new RenderTargetCube(
                graphicsDevice,
                shadowMapSize,
                false,
                SurfaceFormat.Single,
                DepthFormat.Depth24,
                0,
                RenderTargetUsage.PreserveContents
            );

            var currentRTs = graphicsDevice.GetRenderTargets();
            foreach (CubeMapFace face in Enum.GetValues(typeof(CubeMapFace)))
            {
                graphicsDevice.SetRenderTarget(ShadowMap, face);
                graphicsDevice.Clear(Color.White);
            }

            graphicsDevice.SetRenderTargets(currentRTs);
        }

        public void Dispose()
        {
            ShadowMap.Dispose();
        }
    }
}