Add project files.

FreedomFighter/GameMap.cs

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+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Text.Json;
+using Microsoft.Xna.Framework.Graphics;
+
+namespace FreedomFighter;
+
+/// <summary>
+/// Port of TOmegaMap, loading the JSON files converted from the .omap format.
+/// Only Layer1 pattern indices and triggers are used by the game.
+/// </summary>
+public class GameMap
+{
+    public int WidthCount;
+    public int HeightCount;
+    public int TileWidth = 32;
+    public int TileHeight = 32;
+    public int[][] Layer1 = [];             // [x][y] -> tileset pattern index, -1 = empty
+    public string?[,] TriggerActions = new string?[0, 0];
+    public OmegaImage? Tileset;
+
+    readonly GraphicsDevice _gd;
+    readonly string _contentDir;
+    readonly Dictionary<string, OmegaImage> _tilesetCache = new();
+
+    public GameMap(GraphicsDevice gd, string contentDir)
+    {
+        _gd = gd;
+        _contentDir = contentDir;
+    }
+
+    record TriggerJson(int x, int y, string name, string action);
+    record MapJson(int widthCount, int heightCount, string oil, int tileWidth, int tileHeight,
+        int[][] layer1, TriggerJson[] triggers);
+
+    public void LoadMap(string mapName)
+    {
+        string path = Path.Combine(_contentDir, "maps", Path.GetFileNameWithoutExtension(mapName) + ".json");
+        var m = JsonSerializer.Deserialize<MapJson>(File.ReadAllText(path))!;
+
+        WidthCount = m.widthCount;
+        HeightCount = m.heightCount;
+        TileWidth = m.tileWidth;
+        TileHeight = m.tileHeight;
+        Layer1 = m.layer1;
+
+        TriggerActions = new string?[WidthCount, HeightCount];
+        foreach (var t in m.triggers)
+            TriggerActions[t.x, t.y] = t.action;
+
+        string tilesetFile = Path.GetFileNameWithoutExtension(m.oil).ToLowerInvariant() + "_00.png";
+        if (!_tilesetCache.TryGetValue(tilesetFile, out var tileset))
+        {
+            tileset = OmegaImage.Load(_gd, Path.Combine(_contentDir, "tilesets", tilesetFile), TileWidth, TileHeight, m.oil);
+            _tilesetCache[tilesetFile] = tileset;
+        }
+        Tileset = tileset;
+    }
+}