celesteia archive, last updated april 9th 2024

Signed-off-by: hazel <hazel@hazelthats.me>

1 files changed, 100 insertions, 0 deletions

diff --git a/source/game/systems/LightingSystem.cs b/source/game/systems/LightingSystem.cs
new file mode 100644
index 0000000..73c6cf8
--- /dev/null
+++ b/source/game/systems/LightingSystem.cs
@@ -0,0 +1,100 @@
+using Celesteia.Graphics;
+using Celesteia.Graphics.Lighting;
+using Celesteia.Resources;
+using Microsoft.Xna.Framework;
+using Microsoft.Xna.Framework.Graphics;
+using MonoGame.Extended.Entities.Systems;
+using Celesteia.Resources.Types;
+using Celesteia.Game.Planets;
+using System.Threading.Tasks;
+using System.Collections.Generic;
+
+namespace Celesteia.Game.Systems {
+    public class LightingSystem : IUpdateSystem, IDrawSystem
+    {
+        private readonly Camera2D _camera;
+        private readonly SpriteBatch _spriteBatch;
+        private readonly ChunkMap _chunkMap;
+
+        public LightingSystem(Camera2D camera, SpriteBatch spriteBatch, ChunkMap chunkMap) {
+            _camera = camera;
+            _spriteBatch = spriteBatch;
+            _chunkMap = chunkMap;
+        }
+        public void Dispose() { }
+        
+        private int _lightRenderDistance = 5;
+
+        private Dictionary<byte, BlockLightProperties> lightingDictionary;
+        public void Initialize(MonoGame.Extended.Entities.World world) {
+            int _size = 2 * _lightRenderDistance * Chunk.CHUNK_SIZE;
+
+            _lightMap = new LightMap(_size, _size);
+            _texture = new Texture2D(_spriteBatch.GraphicsDevice, _size, _size);
+
+            lightingDictionary = new Dictionary<byte, BlockLightProperties>();
+        }
+
+        private LightMap _lightMap;
+        private Texture2D _texture;
+
+        private bool drawTexture = false;
+        private Task _lightUpdate;
+        public void Update(GameTime gameTime)
+        {
+            if (_lightUpdate == null || (_lightUpdate != null && _lightUpdate.IsCompleted))
+                    _lightUpdate = Task.Factory.StartNew(() => UpdateLight());
+                
+            if (drawTexture) UpdateTexture();
+        }
+        
+        private Point _position;
+        private void UpdatePosition() {
+            _position = ChunkVector.FromVector2(_camera.Center).Resolve() - new Point(_lightRenderDistance * Chunk.CHUNK_SIZE);
+        }
+
+        private void UpdateTexture() {
+            _drawPosition = _position.ToVector2();
+            _texture.SetData<Color>(_lightMap.GetColors(), 0, _lightMap.GetColorCount());
+            drawTexture = false;
+        }
+
+        private void UpdateLight() {
+            UpdatePosition();
+            
+            UpdateEmission();
+            _lightMap.Propagate();
+            _lightMap.CreateColorMap();
+
+            drawTexture = true;
+        }
+
+        private BlockState _block;
+        private void UpdateEmission() {
+            for (int i = 0; i < _lightMap.Width; i++) {
+                for (int j = 0; j < _lightMap.Height; j++) {
+                    if (!(_block = _chunkMap.GetForeground(i + _position.X, j + _position.Y)).Empty && _lightMap.AddForeground(i, j, _block.Type.Light)) continue;
+                    if (!(_block = _chunkMap.GetBackground(i + _position.X, j + _position.Y)).Empty && _lightMap.AddBackground(i, j, _block.Type.Light)) continue;
+
+                    _lightMap.AddLight(i, j, true, LightColor.ambient, 4);
+                }
+            }
+        }
+
+        private BlendState multiply = new BlendState() {
+            ColorBlendFunction = BlendFunction.Add,
+            ColorSourceBlend = Blend.DestinationColor,
+            ColorDestinationBlend = Blend.Zero,
+        };
+
+        private Vector2 _drawPosition;
+        public void Draw(GameTime gameTime)
+        {
+            _spriteBatch.Begin(SpriteSortMode.Immediate, multiply, SamplerState.LinearClamp, null, null, null, _camera.GetViewMatrix());
+
+            _spriteBatch.Draw(_texture, _drawPosition, Color.White);
+
+            _spriteBatch.End();
+        }
+    }
+}
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