Add TerrainScene: code-built tilemap terrain with pawns and props

Small seed-generated terrain rendered as a single Tilemap entity: water,
sand and mountains are tinted tiles, grass and forest use atlas textures.
Three wandering pawns and a few props (snowman, lamp, stool, trees) live
on the shared Y-sort layer (now in GameLayers, used by both scenes).
Console: 'terrain [seed]' from the world scene, 'regen'/'world' inside.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/LittleSim/LittleSim.csproj

@@ -12,6 +12,7 @@
     <ProjectReference Include="..\..\engine\src\MrGameEng.Audio\MrGameEng.Audio.csproj" />
     <ProjectReference Include="..\..\engine\src\MrGameEng.Assets\MrGameEng.Assets.csproj" />
     <ProjectReference Include="..\..\engine\src\MrGameEng.Atlases\MrGameEng.Atlases.csproj" />
+    <ProjectReference Include="..\..\engine\src\MrGameEng.Tilemaps\MrGameEng.Tilemaps.csproj" />
     <ProjectReference Include="..\..\engine\src\MrGameEng.UI\MrGameEng.UI.csproj" />
     <ProjectReference Include="..\..\engine\src\MrGameEng.DevConsole\MrGameEng.DevConsole.csproj" />
     <ProjectReference Include="..\..\engine\src\MrGameEng.Assets.Generator\MrGameEng.Assets.Generator.csproj"

src/LittleSim/Scenes/GameLayers.cs

@@ -0,0 +1,27 @@
+using MrGameEng.Graphics;
+
+namespace LittleSim.Scenes;
+
+/// <summary>
+/// Слои рендера игры. Renderer2D и его реестр слоёв общие для всех сцен,
+/// поэтому регистрация выполняется один раз на процесс.
+/// </summary>
+public static class GameLayers
+{
+    private static bool _registered;
+
+    /// <summary>Y-sort слой существ и объектов мира: кто ниже на экране — тот ближе.</summary>
+    public static LayerId Beings { get; private set; }
+
+    /// <summary>Регистрирует слои при первом вызове.</summary>
+    public static void EnsureRegistered(Renderer2D renderer)
+    {
+        if (_registered)
+        {
+            return;
+        }
+
+        Beings = renderer.Layers.Register("Beings", LayerSpace.World, LayerSortMode.YSort);
+        _registered = true;
+    }
+}

src/LittleSim/Scenes/TerrainScene.cs

@@ -0,0 +1,173 @@
+using Friflo.Engine.ECS;
+using LittleSim.Sim;
+using Microsoft.Xna.Framework;
+using MrGameEng.Assets;
+using MrGameEng.Atlases;
+using MrGameEng.Core;
+using MrGameEng.DevConsole;
+using MrGameEng.Graphics;
+using MrGameEng.Input;
+using MrGameEng.Tilemaps;
+using MrGameEng.UI;
+using Myra.Graphics2D.UI;
+
+namespace LittleSim.Scenes;
+
+/// <summary>
+/// Демо-сцена тайлового террейна: небольшая карта-Tilemap, сгенерированная по сиду
+/// (вода и горы — тонированные тайлы, трава и лес — текстуры из атласа), пара бродящих
+/// персонажей и несколько объектов. Команды консоли: "regen [seed]", "world".
+/// </summary>
+public sealed class TerrainScene : Scene
+{
+    private const int TerrainWidth = 44;
+    private const int TerrainHeight = 28;
+    private const int CellSize = 24;
+    private const int Population = 3;
+
+    private static readonly RectF TerrainBounds = new(0f, 0f, TerrainWidth * CellSize, TerrainHeight * CellSize);
+
+    private static readonly (string Key, float Cells)[] Objects =
+    [
+        ("Things/Building/Art/Snowman/Snowman_A", 1.8f),
+        ("Things/Building/BuildingStyles/Rustic/RusticLampStanding", 1.4f),
+        ("Things/Building/BuildingStyles/Totemic/Stool/TotemicStool_east", 1.1f),
+    ];
+
+    private readonly int _seed;
+
+    public TerrainScene(int seed) => _seed = seed;
+
+    protected override void OnLoad()
+    {
+        var assets = Context.Services.GetOrDefault<AssetManager>() ?? Context.UseAssets();
+        Context.UseTextureAtlases();
+        var input = this.UseInput();
+        var renderer = this.UseRenderer2D(new Renderer2DOptions { VirtualResolution = new Point(1280, 720) });
+        GameLayers.EnsureRegistered(renderer);
+        this.UseTilemaps();
+
+        var white = new Texture2DRegion(assets.Load(GameAssets.Textures.White));
+        var terrainAtlas = assets.Load(GameAssets.Atlases.TerrainSurfaces);
+        var pawnAtlas = assets.Load(GameAssets.Atlases.ThingsPawn);
+        var plantAtlas = assets.Load(GameAssets.Atlases.ThingsPlant);
+        var buildingAtlas = assets.Load(GameAssets.Atlases.ThingsBuilding);
+
+        // Тайлсет: вода/песок/горы — тонированная белая текстура, трава и лес — атлас
+        // (две текстуры террейна → весь пол рисуется парой draw call'ов).
+        var tiles = new TileSet();
+        var tileByKind = new Dictionary<TerrainKind, ushort>
+        {
+            [TerrainKind.DeepWater] = tiles.Add(white, new Color(23, 63, 95)),
+            [TerrainKind.Water] = tiles.Add(white, new Color(32, 99, 155)),
+            [TerrainKind.Sand] = tiles.Add(white, new Color(237, 201, 120)),
+            [TerrainKind.Grass] = tiles.Add(terrainAtlas.GetRegion("Terrain/Surfaces/Marsh_bright")),
+            [TerrainKind.Forest] = tiles.Add(terrainAtlas.GetRegion("Terrain/Surfaces/Marsh")),
+            [TerrainKind.Mountain] = tiles.Add(white, new Color(136, 132, 128)),
+        };
+
+        // Террейн строится кодом: высоты по сиду → вид клетки → id тайла в гриде.
+        var random = new Random(_seed);
+        var heights = WorldGenerator.GenerateHeights(TerrainWidth, TerrainHeight, _seed);
+        var grid = new TileGrid(TerrainWidth, TerrainHeight);
+        var landCells = new List<Point>();
+        for (var x = 0; x < TerrainWidth; x++)
+        {
+            for (var y = 0; y < TerrainHeight; y++)
+            {
+                var kind = WorldGenerator.Classify(heights[x, y]);
+                grid[x, y] = tileByKind[kind];
+                if (WorldGenerator.IsLand(kind))
+                {
+                    landCells.Add(new Point(x, y));
+                }
+
+                if (kind == TerrainKind.Forest && random.NextSingle() < 0.3f)
+                {
+                    SpawnOnCell(
+                        plantAtlas.GetRegion(
+                            "Things/Plant/" + WorldScene.ForestTrees[random.Next(WorldScene.ForestTrees.Length)]),
+                        new Point(x, y), random, sizeCells: 2.2f);
+                }
+            }
+        }
+
+        Store.CreateEntity(new Tilemap(grid, tiles, CellSize));
+
+        // Несколько объектов на суше: снеговик, лампа, табурет.
+        foreach (var (key, sizeCells) in Objects)
+        {
+            if (landCells.Count == 0)
+            {
+                break;
+            }
+
+            SpawnOnCell(buildingAtlas.GetRegion(key), landCells[random.Next(landCells.Count)], random, sizeCells);
+        }
+
+        // Пара персонажей, бродящих по террейну.
+        for (var i = 0; i < Population && landCells.Count > 0; i++)
+        {
+            var cell = landCells[random.Next(landCells.Count)];
+            var body = pawnAtlas.GetRegion(
+                "Things/Pawn/Humanlike/Bodies/" + WorldScene.BeingBodies[random.Next(WorldScene.BeingBodies.Length)] + "_south");
+            var sprite = new Sprite(body, GameLayers.Beings);
+            sprite.CenterOrigin();
+            Store.CreateEntity(
+                new Transform2D(
+                    new Vector2((cell.X + 0.5f) * CellSize, (cell.Y + 0.5f) * CellSize),
+                    scale: new Vector2(CellSize * 1.6f / body.Width)),
+                sprite,
+                new Wander());
+        }
+
+        var camera = Store.CreateEntity(new Camera(TerrainBounds.Center, zoom: 1.6f, bounds: TerrainBounds));
+
+        var desktop = this.UseUI();
+        var hudLabel = new Label { Left = 10, Top = 8 };
+        desktop.Root = hudLabel;
+        hudLabel.Text = $"LittleSim | террейн | seed {_seed}\nWASD — камера, колесо — зум, ` — консоль ('regen', 'world')";
+
+        var console = this.UseDevConsole();
+        console.Register("regen", "regen [seed] — regenerate the terrain", (c, args) =>
+        {
+            if (Context.Scenes.IsTransitioning)
+            {
+                return;
+            }
+
+            var seed = args.Length > 0 ? int.Parse(args[0]) : Random.Shared.Next();
+            c.WriteLine($"regenerating terrain, seed {seed}");
+            Context.Scenes.Switch(new TerrainScene(seed), Transition.Fade(0.6f));
+        });
+        console.Register("world", "world [seed] — switch to the world scene", (c, args) =>
+        {
+            if (Context.Scenes.IsTransitioning)
+            {
+                return;
+            }
+
+            var seed = args.Length > 0 ? int.Parse(args[0]) : _seed;
+            Context.Scenes.Switch(new WorldScene(seed), Transition.Fade(0.6f));
+        });
+
+        UpdateSystems.Add(new WanderSystem(_seed, TerrainBounds));
+        UpdateSystems.Add(new GodCameraSystem(camera, input, console));
+
+        Log.Info($"Terrain generated: seed {_seed}, {TerrainWidth}x{TerrainHeight} cells");
+    }
+
+    /// <summary>Ставит объект на клетку с лёгким смещением; масштаб задаётся в клетках.</summary>
+    private void SpawnOnCell(Texture2DRegion region, Point cell, Random random, float sizeCells)
+    {
+        var sprite = new Sprite(region, GameLayers.Beings);
+        sprite.CenterOrigin();
+        Store.CreateEntity(
+            new Transform2D(
+                new Vector2(
+                    (cell.X + 0.3f + random.NextSingle() * 0.4f) * CellSize,
+                    (cell.Y + 0.3f + random.NextSingle() * 0.4f) * CellSize),
+                scale: new Vector2(CellSize * sizeCells / region.Width)),
+            sprite);
+    }
+}

src/LittleSim/Scenes/WorldScene.cs

@@ -24,17 +24,15 @@ public sealed class WorldScene : Scene
     private const int Population = 80;
 
     private static readonly RectF WorldBounds = new(0f, 0f, WorldWidth * CellSize, WorldHeight * CellSize);
-    private static LayerId _beingsLayer;
-    private static bool _layersRegistered;
 
     private readonly int _seed;
 
     public WorldScene(int seed) => _seed = seed;
 
-    private static readonly string[] BeingBodies =
+    internal static readonly string[] BeingBodies =
         ["FurCovered_Male", "FurCovered_Female", "FurCovered_Thin", "FurCovered_Fat", "FurCovered_Hulk"];
 
-    private static readonly string[] ForestTrees =
+    internal static readonly string[] ForestTrees =
         ["TreeOak/TreeOakA", "TreeOak/TreeOakB", "TreeBirch/TreeBirchA", "TreeGrayPine/TreeGrayPineA"];
 
     protected override void OnLoad()
@@ -43,11 +41,7 @@ public sealed class WorldScene : Scene
         Context.UseTextureAtlases();
         var input = this.UseInput();
         var renderer = this.UseRenderer2D(new Renderer2DOptions { VirtualResolution = new Point(1280, 720) });
-        if (!_layersRegistered)
+        GameLayers.EnsureRegistered(renderer);
-        {
-            _beingsLayer = renderer.Layers.Register("Beings", LayerSpace.World, LayerSortMode.YSort);
-            _layersRegistered = true;
-        }
 
         var white = new Texture2DRegion(assets.Load(GameAssets.Textures.White));
 
@@ -76,7 +70,7 @@ public sealed class WorldScene : Scene
                 if (kind == TerrainKind.Forest && random.NextSingle() < 0.35f)
                 {
                     var tree = plantAtlas.GetRegion("Things/Plant/" + ForestTrees[random.Next(ForestTrees.Length)]);
-                    var treeSprite = new Sprite(tree, _beingsLayer);
+                    var treeSprite = new Sprite(tree, GameLayers.Beings);
                     treeSprite.CenterOrigin();
                     Store.CreateEntity(
                         new Transform2D(
@@ -96,7 +90,7 @@ public sealed class WorldScene : Scene
             var cell = landCells[random.Next(landCells.Count)];
             var body = pawnAtlas.GetRegion(
                 "Things/Pawn/Humanlike/Bodies/" + BeingBodies[random.Next(BeingBodies.Length)] + "_south");
-            var sprite = new Sprite(body, _beingsLayer);
+            var sprite = new Sprite(body, GameLayers.Beings);
             sprite.CenterOrigin();
             Store.CreateEntity(
                 new Transform2D(
@@ -162,6 +156,18 @@ public sealed class WorldScene : Scene
             c.WriteLine($"{keys.Count} region(s){(keys.Count > 25 ? ", showing first 25" : "")}");
         });
 
+        console.Register("terrain", "terrain [seed] — switch to the tile terrain scene", (c, args) =>
+        {
+            if (Context.Scenes.IsTransitioning)
+            {
+                return;
+            }
+
+            var seed = args.Length > 0 ? int.Parse(args[0]) : _seed;
+            c.WriteLine($"switching to terrain scene, seed {seed}");
+            Context.Scenes.Switch(new TerrainScene(seed), Transition.Fade(0.6f));
+        });
+
         UpdateSystems.Add(new WanderSystem(_seed, WorldBounds));
         UpdateSystems.Add(new GodCameraSystem(camera, input, console));
         UpdateSystems.Add(new HudSystem(Context, hudLabel, _seed, Population));

src/LittleSim/Sim/SimSystems.cs

@@ -100,6 +100,6 @@ public sealed class HudSystem(
         var fps = _frames / _accumulated;
         _accumulated = 0f;
         _frames = 0;
-        label.Text = $"LittleSim | seed {seed} | население {population} | {fps:F0} FPS\nWASD — камера, колесо — зум, ` — консоль ('regen', 'timescale', 'atlas')";
+        label.Text = $"LittleSim | seed {seed} | население {population} | {fps:F0} FPS\nWASD — камера, колесо — зум, ` — консоль ('regen', 'terrain', 'timescale', 'atlas')";
     }
 }