Custom Scenery Tiles

Celeste.Mod.mm/Mod/Meta/MapMeta.cs

@@ -61,6 +61,8 @@ public MapMeta(BinaryPacker.Element meta) {
         public string Sprites { get; set; }
         public string Portraits { get; set; }
 
+        public string SceneryTiles { get; set; }
+
         public bool? OverrideASideMeta { get; set; }
 
         public MapMetaModeProperties[] Modes { get; set; }
@@ -114,6 +116,9 @@ public void Parse(BinaryPacker.Element meta) {
             meta.AttrIf("AnimatedTiles", v => AnimatedTiles = v);
             meta.AttrIf("Sprites", v => Sprites = v);
             meta.AttrIf("Portraits", v => Portraits = v);
+
+            meta.AttrIf("SceneryTiles", v => SceneryTiles = v);
+
             meta.AttrIfBool("OverrideASideMeta", v => OverrideASideMeta = v);
 
             BinaryPacker.Element child;
@@ -224,6 +229,9 @@ public void ApplyTo(patch_AreaData area) {
                 if (!string.IsNullOrEmpty(Portraits))
                     meta.Portraits = Portraits;
 
+                if (!string.IsNullOrEmpty(SceneryTiles))
+                    meta.SceneryTiles = SceneryTiles;
+
                 if (OverrideASideMeta != null)
                     meta.OverrideASideMeta = OverrideASideMeta;
 

Celeste.Mod.mm/Patches/Level.cs

@@ -758,6 +758,9 @@ public static void PatchLevelLoader(ILContext context, CustomAttribute attrib) {
             FieldReference f_currentEntityId = context.Method.DeclaringType.FindField("_currentEntityId")!;
             MethodReference m_IsInDoNotLoadIncreased = context.Method.DeclaringType.FindMethod("_IsInDoNotLoadIncreased")!;
 
+            TypeDefinition t_GFX = MonoModRule.Modder.FindType("Celeste.GFX").Resolve();
+            FieldDefinition f_GFX_SceneryTiles = t_GFX.FindField("SceneryTiles");
+
             ILCursor cursor = new ILCursor(context);
 
             // Insert our custom entity loader and use it for levelData.Entities and levelData.Triggers
@@ -882,6 +885,26 @@ public static void PatchLevelLoader(ILContext context, CustomAttribute attrib) {
             cursor.Next.OpCode = OpCodes.Call;
             cursor.Next.Operand = m_LoadNewPlayer;
 
+            // Reset to apply patch for Scenery Tiles
+            cursor.Index = 0;
+
+            // Patch this bit of code to use GFX.SceneryTiles instead of creating the same tileset again
+            //  before: Tileset tileset = new Tileset(GFX.Game["tilesets/scenery"], 8, 8);
+            //  after:  Tileset tileset = GFX.SceneryTiles;
+            cursor.GotoNext(MoveType.AfterLabel,
+                    instr => instr.MatchLdsfld("Celeste.GFX", "Game"),
+                    instr => instr.MatchLdstr("tilesets/scenery")
+                );
+            // to remove:
+            // - ldsfld Celeste.GFX::Game
+            // - ldstr "tilesets/scenery"
+            // - callvirt Monocle.Atlas::get_Item(string)
+            // - ldc.i4.8
+            // - ldc.i4.8
+            // - newobj Monocle.Tileset::.ctor(class Monocle.MTexture, int32, int32)
+            cursor.RemoveRange(6);
+            cursor.Emit(OpCodes.Ldsfld, f_GFX_SceneryTiles);
+
             // Reset to apply static constructor patch
             cursor.Index = 0;
 

Celeste.Mod.mm/Patches/LevelLoader.cs

@@ -207,6 +207,12 @@ public void ctor(Session session, Vector2? startPosition = default) {
                 if (string.IsNullOrEmpty(path))
                     path = Path.Combine("Graphics", "Portraits.xml");
                 GFX.PortraitsSpriteBank = new SpriteBank(GFX.Portraits, path);
+
+                path = meta?.SceneryTiles;
+                if (string.IsNullOrEmpty(path))
+                    path = "tilesets/scenery";
+                GFX.SceneryTiles = new Tileset(GFX.Game[path], 8, 8);
+
             } catch (Exception e) {
                 if (patch_LevelEnter.ErrorMessage == null) {
                     if (e is XmlException) {