Worked a bit on prefabs of all things

src/dawn/prefab/Prefab.hpp

@@ -0,0 +1,14 @@
+// Copyright (c) 2024 Dominic Masters
+// 
+// This software is released under the MIT License.
+// https://opensource.org/licenses/MIT
+
+#pragma once
+#include "scene/Scene.hpp"
+
+namespace Dawn {
+  struct Prefab {
+    public:
+      std::shared_ptr<SceneItem> item;
+  };
+}

src/dawn/prefab/SimpleSpinningCube.cpp

@@ -4,32 +4,32 @@
 // https://opensource.org/licenses/MIT
 
 #include "SimpleSpinningCube.hpp"
-#include "component/display/MeshRenderer.hpp"
-#include "component/display/material/SimpleTexturedMaterial.hpp"
 #include "display/mesh/CubeMesh.hpp"
 #include "component/SimpleComponent.hpp"
 
 using namespace Dawn;
 
-std::shared_ptr<SceneItem> Dawn::createSimpleSpinningCube(Scene &s) {
+struct SimpleSpinningCube Dawn::createSimpleSpinningCube(Scene &s) {
+  struct SimpleSpinningCube cube;
+
   // Create the scene item.
-  auto cubeItem = s.createSceneItem();
+  cube.item = s.createSceneItem();
 
   // Create a simple cube mesh.
-  auto cubeMesh = std::make_shared<Mesh>();
-  cubeMesh->createBuffers(CUBE_VERTICE_COUNT, CUBE_INDICE_COUNT);
-  CubeMesh::buffer(cubeMesh, glm::vec3(-1, -1, -1), glm::vec3(2, 2, 2), 0, 0);
+  cube.mesh = std::make_shared<Mesh>();
+  cube.mesh->createBuffers(CUBE_VERTICE_COUNT, CUBE_INDICE_COUNT);
+  CubeMesh::buffer(cube.mesh, glm::vec3(-1, -1, -1), glm::vec3(2, 2, 2), 0, 0);
 
   // Add a renderer to the scene item.
-  auto cubeMeshRenderer = cubeItem->addComponent<MeshRenderer>();
-  cubeMeshRenderer->mesh = cubeMesh;
+  cube.meshRenderer = cube.item->addComponent<MeshRenderer>();
+  cube.meshRenderer->mesh = cube.mesh;
 
   // Add a material to the scene item.
-  auto cubeMaterial = cubeItem->addComponent<SimpleTexturedMaterial>();
-  cubeMaterial->setColor(COLOR_MAGENTA);
+  cube.material = cube.item->addComponent<SimpleTexturedMaterial>();
+  cube.material->setColor(COLOR_MAGENTA);
 
   // Add a simple event listener component to the scene item.
-  addSimpleComponent(cubeItem, [](auto &cmp, auto &events) {
+  addSimpleComponent(cube.item, [](auto &cmp, auto &events) {
     // Note that add component cannot receive a self reference, so we must
     // capture the component by reference instead.
     events.push_back(cmp.getScene()->onUnpausedUpdate.listen([&](
@@ -45,5 +45,5 @@ std::shared_ptr<SceneItem> Dawn::createSimpleSpinningCube(Scene &s) {
     }));
   });
 
-  return cubeItem;
+  return cube;
 }

src/dawn/prefab/SimpleSpinningCube.hpp

@@ -4,8 +4,23 @@
 // https://opensource.org/licenses/MIT
 
 #pragma once
-#include "scene/Scene.hpp"
+#include "prefab/Prefab.hpp"
+#include "component/display/MeshRenderer.hpp"
+#include "component/display/material/SimpleTexturedMaterial.hpp"
 
 namespace Dawn {
-  std::shared_ptr<SceneItem> createSimpleSpinningCube(Scene &s);
+  struct SimpleSpinningCube : public Prefab {
+    public:
+      std::shared_ptr<Mesh> mesh;
+      std::shared_ptr<MeshRenderer> meshRenderer;
+      std::shared_ptr<SimpleTexturedMaterial> material;
+  };
+
+  /**
+   * Creates a simple spinning cube prefab on the scene.
+   * 
+   * @param s Scene to add the simple spinning cube to.
+   * @return The simple spinning cube prefab.
+   */
+  struct SimpleSpinningCube createSimpleSpinningCube(Scene &s);
 }

src/dawn/scene/SceneComponent.cpp

@@ -44,17 +44,23 @@ void SceneComponent::dispose() {
 }
 
 std::shared_ptr<SceneItem> SceneComponent::getItem() {
-  return this->item.lock();
+  auto item = this->item.lock();
+  assertNotNull(item, "Item cannot be null?");
+  return item;
 }
 
 std::shared_ptr<Scene> SceneComponent::getScene() {
   auto item = this->getItem();
-  return item->getScene();
+  auto scene = item->getScene();
+  assertNotNull(scene, "Scene cannot be null?");
+  return scene;
 }
 
 std::shared_ptr<Game> SceneComponent::getGame() {
   auto scene = this->getScene();
-  return scene->getGame();
+  auto game = scene->getGame();
+  assertNotNull(game, "Game cannot be null?");
+  return game;
 }
 
 SceneComponent::~SceneComponent() {

src/dawn/scene/SceneComponent.hpp

@@ -13,6 +13,7 @@ namespace Dawn {
   class Game;
   class Scene;
   class SceneItem;
+  class SceneItemComponents;
 
   class SceneComponent : std::enable_shared_from_this<SceneComponent> {
     private:
@@ -70,5 +71,8 @@ namespace Dawn {
        * Disposes this scene component.
        */
       virtual ~SceneComponent();
+
+      friend class SceneItem;
+      friend class SceneItemComponents;
   };
 }

src/dawn/scene/item/SceneItemComponents.hpp

@@ -43,6 +43,7 @@ namespace Dawn {
         this->components.push_back(
           static_pointer_cast<SceneComponent>(component)
         );
+        component->item = this->sceneItemComponentsSelf();
         return component;
       }