Wipe parsing

Celeste.Mod.mm/Mod/Backdrops/CustomBackdropAttribute.cs

@@ -9,14 +9,18 @@ namespace Celeste.Mod.Backdrops {
     [AttributeUsage(AttributeTargets.Class, AllowMultiple = false, Inherited = false)]
     public class CustomBackdropAttribute : Attribute {
         /// <summary>
-        /// A list of unique identifiers for this Backdrop.
+        /// A list of unique identifiers for this Backdrop.<br/>
+        /// Follows the pattern "ID [= LoadMethodName]".
         /// </summary>
         public string[] IDs { get; }
 
         /// <summary>
         /// Marks this backdrop as a Custom <see cref="Backdrop"/>.
         /// </summary>
-        /// <param name="ids">A list of unique identifiers for this Backdrop.</param>
+        /// <param name="ids">
+        /// A list of unique identifiers for this Backdrop.<br/>
+        /// Follows the pattern "ID [= LoadMethodName]".
+        /// </param>
         public CustomBackdropAttribute(params string[] ids) {
             IDs = ids;
         }

Celeste.Mod.mm/Mod/Entities/CustomEntityAttribute.cs

@@ -13,14 +13,18 @@ namespace Celeste.Mod.Entities {
     public class CustomEntityAttribute : Attribute {
 
         /// <summary>
-        /// A list of unique identifiers for this Entity.
+        /// A list of unique identifiers for this Entity.<br/>
+        /// Follows the pattern "ID [= LoadMethodName]".
         /// </summary>
         public string[] IDs;
 
         /// <summary>
         /// Mark this entity as a Custom <see cref="Entity"/> or <see cref="Trigger"/>.
         /// </summary>
-        /// <param name="ids">A list of unique identifiers for this Entity.</param>
+        /// <param name="ids">
+        /// A list of unique identifiers for this Entity.<br/>
+        /// Follows the pattern "ID [= LoadMethodName]".
+        /// </param>
         public CustomEntityAttribute(params string[] ids) {
             IDs = ids;
         }

Celeste.Mod.mm/Mod/Entities/CustomEventAttribute.cs

@@ -13,14 +13,18 @@ namespace Celeste.Mod.Entities {
     public class CustomEventAttribute : Attribute {
 
         /// <summary>
-        /// A list of unique identifiers for this Event.
+        /// A list of unique identifiers for this Event.<br/>
+        /// Follows the pattern "ID [= LoadMethodName]".
         /// </summary>
         public string[] IDs;
 
         /// <summary>
         /// Mark this entity as a Custom <see cref="CutsceneEntity"/> or other Event <see cref="Entity"/>.
         /// </summary>
-        /// <param name="ids">A list of unique identifiers for this Event.</param>
+        /// <param name="ids">
+        /// A list of unique identifiers for this Event.<br/>
+        /// Follows the pattern "ID [= LoadMethodName]".
+        /// </param>
         public CustomEventAttribute(params string[] ids) {
             IDs = ids;
         }

Celeste.Mod.mm/Mod/Entities/CustomWipeAttribute.cs

@@ -0,0 +1,32 @@
+using System;
+
+namespace Celeste.Mod.Entities;
+
+/// <summary>
+/// Mark this renderer as a custom <see cref="ScreenWipe"/> with an identifier.
+/// <br/>
+/// This Screen Wipe will be applied if the map's Wipe metadata has a matching value.
+/// <br/>
+/// If there is no match, then the full type name of the Screen Wipe is checked for.
+/// </summary>
+[AttributeUsage(AttributeTargets.Class, AllowMultiple = false, Inherited = false)]
+public class CustomWipeAttribute : Attribute {
+
+    /// <summary>
+    /// A list of unique identifiers for this Screen Wipe.<br/>
+    /// Follows the pattern "ID [= LoadMethodName]".
+    /// </summary>
+    public string[] IDs;
+
+    /// <summary>
+    /// Mark this renderer as a custom <see cref="ScreenWipe"/> with an identifier.<br/>
+    /// If there is no match, then the full type name of the Screen Wipe is checked for.
+    /// </summary>
+    /// <param name="ids">
+    /// A list of unique identifiers for this Screen Wipe.<br/>
+    /// Follows the pattern "ID [= LoadMethodName]".
+    /// </param>
+    public CustomWipeAttribute(params string[] ids) {
+        IDs = ids;
+    }
+}

Celeste.Mod.mm/Mod/Everest/Everest.Events.cs

@@ -404,6 +404,22 @@ public static class SubHudRenderer {
                 internal static void BeforeRender(_SubHudRenderer renderer, Scene scene)
                     => OnBeforeRender?.Invoke(renderer, scene);
             }
+
+            public static class MapMeta {
+                public delegate Action<Scene, bool, Action> ParseWipeHandler(string wipe);
+                public static event ParseWipeHandler OnParseWipe;
+                internal static Action<Scene, bool, Action> ParseWipe(string wipe) {
+                    if (OnParseWipe is null)
+                        return null;
+
+                    foreach (ParseWipeHandler handler in OnParseWipe.GetInvocationList()) {
+                        if (handler(wipe) is { } wipeLoader)
+                            return wipeLoader;
+                    }
+
+                    return null;
+                }
+            }
         }
     }
 }

Celeste.Mod.mm/Mod/Everest/Everest.Loader.cs

@@ -822,6 +822,53 @@ internal static void ProcessAssembly(EverestModuleMetadata meta, Assembly asm, T
                         }
                     }
 
+                    // Search for all Screen Wipes marked with the CustomWipeAttribute.
+                    foreach (CustomWipeAttribute attrib in type.GetCustomAttributes<CustomWipeAttribute>()) {
+                        foreach (string idFull in attrib.IDs) {
+                            string id;
+                            string genName;
+                            string[] split = idFull.Split('=');
+
+                            if (split.Length == 1) {
+                                id = split[0];
+                                genName = "Load";
+                            } else if (split.Length == 2) {
+                                id = split[0];
+                                genName = split[1];
+                            } else {
+                                Logger.Warn("core", $"Invalid number of custom wipe ID elements: {idFull} ({type.FullName})");
+                                continue;
+                            }
+
+                            id = id.Trim();
+                            genName = genName.Trim();
+
+                            Action<Scene, bool, Action> loader = null;
+
+                            ConstructorInfo ctor;
+                            MethodInfo gen;
+
+                            gen = type.GetMethod(genName, new Type[] { typeof(Scene), typeof(bool), typeof(Action) });
+                            if (gen != null && gen.IsStatic && gen.ReturnType.IsCompatible(typeof(ScreenWipe))) {
+                                loader = (scene, wipeIn, onComplete) => gen.Invoke(null, new object[] { scene, wipeIn, onComplete });
+                                goto RegisterWipeLoader;
+                            }
+
+                            ctor = type.GetConstructor(new Type[] { typeof(Scene), typeof(bool), typeof(Action) });
+                            if (ctor != null) {
+                                loader = (scene, wipeIn, onComplete) => ctor.Invoke(new object[] { scene, wipeIn, onComplete });
+                                goto RegisterWipeLoader;
+                            }
+
+                            RegisterWipeLoader:
+                            if (loader == null) {
+                                Logger.Warn("core", $"Found custom wipe without suitable constructor / {genName}(Scene, bool, Action): {id} ({type.FullName})");
+                                continue;
+                            }
+                            patch_AreaData.WipeLoaders[id] = loader;
+                        }
+                    }
+
                     // we already are in the overworld. Register new Ouis real quick!
                     if (Engine.Instance != null && Engine.Scene is Overworld overworld && typeof(Oui).IsAssignableFrom(type) && !type.IsAbstract) {
                         Logger.Verbose("core", $"Instantiating UI from {meta}: {type.FullName}");

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

@@ -161,10 +161,17 @@ public void ApplyTo(patch_AreaData area) {
                 area.ColorGrade = ColorGrade;
 
             if (!string.IsNullOrEmpty(Wipe)) {
-                Type type = Assembly.GetEntryAssembly().GetType(Wipe);
-                ConstructorInfo ctor = type?.GetConstructor(new Type[] { typeof(Scene), typeof(bool), typeof(Action) });
-                if (type != null && ctor != null) {
-                    area.Wipe = (scene, wipeIn, onComplete) => ctor.Invoke(new object[] { scene, wipeIn, onComplete });
+                string wipeStr = Wipe;
+                if (Everest.Events.MapMeta.ParseWipe(wipeStr) is { } wipeLoader)
+                    area.Wipe = wipeLoader;
+                else if (patch_AreaData.WipeLoaders.TryGetValue(wipeStr, out wipeLoader) && wipeLoader is not null)
+                    area.Wipe = wipeLoader;
+                else {
+                    Type type = Assembly.GetEntryAssembly().GetType(wipeStr);
+                    ConstructorInfo ctor = type?.GetConstructor(new Type[] { typeof(Scene), typeof(bool), typeof(Action) });
+                    if (type != null && ctor != null) {
+                        area.Wipe = (scene, wipeIn, onComplete) => ctor.Invoke(new object[] { scene, wipeIn, onComplete });
+                    }
                 }
             }
 

Celeste.Mod.mm/Patches/AreaData.cs

@@ -14,6 +14,8 @@
 namespace Celeste {
     public class patch_AreaData : AreaData {
 
+        public static readonly Dictionary<string, Action<Scene, bool, Action>> WipeLoaders = new();
+
 #pragma warning disable CS0108 // Hides inherited member
 
         // Required to reference this class in other files