1 files changed, 63 insertions, 0 deletions
diff --git a/source/game/systems/ChunkMapRenderSystem.cs b/source/game/systems/ChunkMapRenderSystem.cs
new file mode 100644
index 0000000..afb867c
--- /dev/null
+++ b/source/game/systems/ChunkMapRenderSystem.cs
@@ -0,0 +1,63 @@
+using System.Collections.Generic;
+using Celesteia.Game.Planets;
+using Celesteia.Graphics;
+using Microsoft.Xna.Framework;
+using Microsoft.Xna.Framework.Graphics;
+using MonoGame.Extended.Entities.Systems;
+
+namespace Celesteia.Game.Systems {
+    public class ChunkMapRenderSystem : IUpdateSystem, IDrawSystem
+    {
+        private readonly Camera2D _camera;
+        private readonly SpriteBatch _spriteBatch;
+        private ChunkVector _lastChunkPos;
+        private ChunkVector _pivotChunkPos => ChunkVector.FromVector2(_camera.Center);
+        public int RenderDistance = 4;
+        private ChunkMap _chunkMap;
+
+        public ChunkMapRenderSystem(Camera2D camera, SpriteBatch spriteBatch, ChunkMap chunkMap) {
+            _camera = camera;
+            _spriteBatch = spriteBatch;
+            _chunkMap = chunkMap;
+        }
+
+        public void Initialize(MonoGame.Extended.Entities.World world) {}
+
+        private ChunkVector _v;
+        private List<ChunkVector> activeChunks = new List<ChunkVector>();
+        public void Update(GameTime gameTime)
+        {
+            if (_lastChunkPos != _pivotChunkPos) {
+                activeChunks.Clear();
+                for (int i = -RenderDistance; i <= RenderDistance; i++) {
+                    _v.X = _pivotChunkPos.X + i;
+                    for (int j = -RenderDistance; j <= RenderDistance; j++) {
+                        _v.Y = _pivotChunkPos.Y + j;
+
+                        if (!_chunkMap.ChunkIsInMap(_v)) continue;
+                        activeChunks.Add(_v);
+                    }
+                }
+
+                _lastChunkPos = _pivotChunkPos;
+            }
+        }
+
+        public void Draw(GameTime gameTime) {
+            _spriteBatch.Begin(SpriteSortMode.Deferred, BlendState.NonPremultiplied, SamplerState.PointWrap, null, null, null, _camera.GetViewMatrix());
+
+            // Draw every chunk in view.
+            foreach (ChunkVector cv in activeChunks) DrawChunk(cv, gameTime, _spriteBatch);
+
+            _spriteBatch.End();
+        }
+
+        private void DrawChunk(ChunkVector cv, GameTime gameTime, SpriteBatch spriteBatch) {
+            Chunk c = _chunkMap.GetChunk(cv);
+
+            if (c != null) c.Draw(gameTime, spriteBatch);
+        }
+
+        public void Dispose() {}
+    }
+}
+\ No newline at end of file