Change new_scenes to new_del_scenes to avoid issues when deleting a scene.

src/loaders/blend.nim

@@ -628,7 +628,7 @@ method loadScene*(self: BlendLoader, name: string="", scene: Scene=nil, callback
                     callback(getCurrentExceptionMsg(), nil)
                     return
                 callback("", scene)
-                if scene.name notin self.engine.new_scenes:
+                if self.engine.new_del_scenes.getOrDefault(scene.name).isNil:
                     # it was deleted
                     return
                 # TODO: when loading is async, move this stuff after loading has

src/myou_engine.nim

@@ -173,11 +173,14 @@ proc myou_main_loop*(self: MyouEngine) =
         updateLoadableWorkerThreads()
     # TODO: make a table object that can be iterated while changing, e.g. with a
     # seq and a dirty flag to update the seq
-    if self.new_scenes.len != 0:
-        for name,scene in self.new_scenes.pairs:
-            self.scenes[name] = scene
-        self.new_scenes.clear()
-    let time = getmonotime().ticks.float/1000000000
+    if self.new_del_scenes.len != 0:
+        for name,scene in self.new_del_scenes.pairs:
+            if scene.nonNil:
+                self.scenes[name] = scene
+            else: # nil means that the scene is meant to be deleted
+                self.scenes.del(name)
+        self.new_del_scenes.clear()
+    let time = getmonotime().ticks.float/1_000_000_000
     let delta_seconds = time - last_time
     for _,scene in self.scenes.pairs:
         if not scene.enabled:

src/scene.nim

@@ -96,7 +96,7 @@ proc initScene*(self: Scene, engine: MyouEngine, name: string = "Scene",
     while self.name in engine.scenes:
         collision_seq += 1
         self.name = name & "$" & $collision_seq
-    engine.new_scenes[self.name] = self
+    engine.new_del_scenes[self.name] = self
     self.mesh_passes.setLen 3
     self.world = newWorld(self)
     self.background_color = vec4(0, 0, 0, 1)
@@ -379,8 +379,7 @@ proc destroy*(self: Scene) =
     for cube in self.cubemaps:
         cube.destroy()
     self.cubemaps = @[]
-    self.engine.scenes.del(self.name)
-    self.engine.new_scenes.del(self.name)
+    self.engine.new_del_scenes[self.name] = nil
     # bound textures can linger
     unbindAllTextures()
     # probably none of this is actually necessary

src/types.nim

@@ -86,7 +86,7 @@ type
         glsl_version*: string
         cache_settings*: CacheSettings
         all_framebuffers*: seq[Framebuffer] ## private
-        new_scenes*: Table[string, Scene] ## private
+        new_del_scenes*: Table[string, Scene] ## private
     
     # gameobject.nim