Add SceneInterface

+ Renames binaries qtk_main->qtk_app and example->example_app

README.md

@@ -74,7 +74,7 @@ We can install this library on a system path or a custom path and then set `CMAK
 Below is an example of installing on a system path.
 
 ```bash
-cmake -S qtk/ -B qtk/build/ -DCMAKE_PREFIX_PATH=$HOME/Qt/6.5.0/gcc_64 -DQTK_INSTALL_GUI=OFF -DQTK_INSTALL_PLUGINS=OFF
+cmake -S qtk/ -B qtk/build/ -DCMAKE_PREFIX_PATH=$HOME/Qt/6.5.0/gcc_64 -DQTK_INSTALL_GUI=OFF -DQTK_INSTALL_PLUGINS=OFF -DQTK_DEBUG=OFF
 cmake --build qtk/build/ -j $(nproc --ignore=2)
 sudo cmake --install . --prefix=/usr/local
 -- Install configuration: "Release"

cmake/templates/Config.cmake.in

@@ -2,7 +2,7 @@
 
 include("${CMAKE_CURRENT_LIST_DIR}/QtkTargets.cmake")
 
-set_and_check(QTK_EXECUTABLE "${PACKAGE_PREFIX_DIR}/bin/qtk_main")
+set_and_check(QTK_EXECUTABLE "${PACKAGE_PREFIX_DIR}/bin/qtk_app")
 set_and_check(QTK_INCLUDE_DIR "${PACKAGE_PREFIX_DIR}/include")
 set_and_check(QTK_LIBRARIES "${PACKAGE_PREFIX_DIR}/lib")
 

example-app/CMakeLists.txt

@@ -65,6 +65,6 @@ set(
     examplewidget.cpp examplewidget.h
 )
 
-add_executable(example ${EXAMPLE_SOURCES})
-target_link_libraries(example PUBLIC Qt6::Widgets Qt6::OpenGLWidgets Qt6::Core)
-target_link_libraries(example PUBLIC Qtk::qtk_library)
+add_executable(example_app ${EXAMPLE_SOURCES})
+target_link_libraries(example_app PUBLIC Qt6::Widgets Qt6::OpenGLWidgets Qt6::Core)
+target_link_libraries(example_app PUBLIC Qtk::qtk_library)

example-app/README.md

@@ -1,7 +1,10 @@
 
 This is an example application that is using the Qtk API to create custom Qt 
 OpenGL widgets. This is very similar to `QtkWidget` in the Qtk desktop 
-application, but could be modified for different uses if needed.
+application source code, but could be modified for different uses if needed.
+
+There are no camera controls supported in this example. The camera is fixed.
+If these controls are desired, they can be implemented by the client.
 
 You can import your own models within `examplescene.cpp`, inside the
 `ExampleScene::init()` function. Rotations and translations

example-app/examplescene.cpp

@@ -10,7 +10,7 @@
 
 using namespace Qtk;
 
-ExampleScene::ExampleScene() {
+ExampleScene::ExampleScene(Qtk::Scene * scene) : Qtk::SceneInterface(scene) {
   setSceneName("Example Scene");
   getCamera().getTransform().setTranslation(-8.0f, 0.0f, 10.0f);
   getCamera().getTransform().setRotation(-5.0f, 0.0f, 1.0f, 0.0f);

example-app/examplescene.h

@@ -11,9 +11,9 @@
 
 #include <qtk/scene.h>
 
-class ExampleScene : public Qtk::Scene {
+class ExampleScene : public Qtk::SceneInterface {
   public:
-    ExampleScene();
+    ExampleScene(Qtk::Scene * scene);
 
     ~ExampleScene();
 

example-app/examplewidget.cpp

@@ -11,7 +11,12 @@
 #include "examplewidget.h"
 
 ExampleWidget::ExampleWidget(QWidget * parent) :
-    QOpenGLWidget(parent), mScene(new ExampleScene) {
+    QOpenGLWidget(parent), mScene(new ExampleScene(new Qtk::SceneEmpty)) {
+  // NOTE: The decorator pattern is used to save / load scenes in Qtk currently.
+  // The initializer above sets mScene to the concrete decorator ExampleScene.
+  // Qtk::SceneEmpty provides an empty scene as the concrete component.
+  // ExampleScene is defined in client source, deriving Qtk::SceneInterface.
+
   QSurfaceFormat format;
   format.setRenderableType(QSurfaceFormat::OpenGL);
   format.setProfile(QSurfaceFormat::CoreProfile);

example-app/examplewidget.h

@@ -32,7 +32,7 @@ class ExampleWidget : public QOpenGLWidget, protected QOpenGLFunctions {
     void update();
 
   private:
-    ExampleScene * mScene;
+    Qtk::Scene * mScene;
 };
 
 #endif  // QTKCLIENT_EXAMPLEWIDGET_H

src/CMakeLists.txt

@@ -32,7 +32,7 @@ if (QTK_INSTALL_GUI OR QTK_INSTALL_PLUGINS)
 
   if(QTK_INSTALL_GUI)
     install(
-        TARGETS qtk_main qtk_library
+        TARGETS qtk_app qtk_library
         COMPONENT qtk
         BUNDLE DESTINATION .
         LIBRARY DESTINATION lib
@@ -41,7 +41,7 @@ if (QTK_INSTALL_GUI OR QTK_INSTALL_PLUGINS)
     )
 
     qt_generate_deploy_app_script(
-        TARGET qtk_main
+        TARGET qtk_app
         OUTPUT_SCRIPT QTK_DEPLOY_SCRIPT
         NO_UNSUPPORTED_PLATFORM_ERROR
     )
@@ -58,7 +58,7 @@ if (QTK_INSTALL_GUI OR QTK_INSTALL_PLUGINS)
         )
         file(TO_NATIVE_PATH "${QT6_INSTALL_PREFIX}/bin" QT6_INSTALL_PREFIX)
 
-        set(VSUSER_FILE "${CMAKE_CURRENT_BINARY_DIR}/qtk_main.vcxproj.user")
+        set(VSUSER_FILE "${CMAKE_CURRENT_BINARY_DIR}/qtk_app.vcxproj.user")
         file(WRITE ${VSUSER_FILE} "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n")
         file(APPEND ${VSUSER_FILE} "<Project xmlns=\"http://schemas.microsoft.com/developer/msbuild/2003\">\n")
         file(APPEND ${VSUSER_FILE} "  <PropertyGroup>\n")
@@ -137,11 +137,11 @@ set(CPACK_NSIS_ENABLE_UNINSTALL_BEFORE_INSTALL ON)
 # https://nsis.sourceforge.io/Reference/CreateShortCut
 set(
     CPACK_NSIS_CREATE_ICONS_EXTRA
-    "CreateShortCut '$SMPROGRAMS\\$STARTMENU_FOLDER\\Qtk.lnk' '$INSTDIR\\bin\\qtk_main.exe'"
+    "CreateShortCut '$SMPROGRAMS\\\\$STARTMENU_FOLDER\\\\Qtk.lnk' '$INSTDIR\\\\bin\\\\qtk_app.exe'"
 )
 set(
     CPACK_NSIS_DELETE_ICONS_EXTRA
-    "Delete '$SMPROGRAMS\\$START_MENU\\Qtk.lnk'"
+    "Delete '$SMPROGRAMS\\\\$START_MENU\\\\Qtk.lnk'"
 )
 # TODO: Icons for NSIS installer.
 #set(CPACK_NSIS_MUI_ICON "${CMAKE_SOURCE_DIR}/resources/icon.png")
@@ -154,9 +154,8 @@ set(CPACK_DEBIAN_PACKAGE_SHLIBDEPS ON)
 #set(CPACK_PACKAGING_INSTALL_PREFIX /usr/local/)
 
 # OSX
-# TODO: Fix OSX appbundle error.
 set(CPACK_BUNDLE_NAME ${PROJECT_NAME})
-set(CPACK_BUNDLE_PLIST $<TARGET_BUNDLE_CONTENT_DIR:qtk_main>/Info.plist)
+set(CPACK_BUNDLE_PLIST $<TARGET_BUNDLE_CONTENT_DIR:qtk_app>/Info.plist)
 set(CPACK_BUNDLE_ICON ${QTK_OSX_ICONS})
 
 # Platform defaults for source bundles.

src/app/CMakeLists.txt

@@ -50,7 +50,7 @@ target_link_libraries(qtk_collection PUBLIC qtk_plugin_library)
 
 set(
     QTK_APP_SOURCES
-    examplescene.cpp examplescene.h
+    qtkscene.cpp qtkscene.h
     main.cpp
 )
 
@@ -61,11 +61,11 @@ configure_file(
     @ONLY
 )
 
-qt_add_executable(qtk_main ${QTK_APP_SOURCES})
-target_link_libraries(qtk_main PRIVATE qtk_plugin_library)
+qt_add_executable(qtk_app ${QTK_APP_SOURCES})
+target_link_libraries(qtk_app PRIVATE qtk_plugin_library)
 
 set_target_properties(
-    qtk_main PROPERTIES
+    qtk_app PROPERTIES
       WIN32_EXECUTABLE TRUE
       MACOSX_BUNDLE TRUE
       MACOSX_BUNDLE_BUNDLE_NAME Qtk

src/app/main.cpp

@@ -9,6 +9,7 @@
 #include <QApplication>
 
 #include "qtkmainwindow.h"
+#include "qtkscene.h"
 
 int main(int argc, char * argv[]) {
   Q_INIT_RESOURCE(resources);
@@ -16,7 +17,12 @@ int main(int argc, char * argv[]) {
   QApplication a(argc, argv);
 
   auto window = MainWindow::getMainWindow();
-  window->show();
 
+  // Qtk currently uses the decorator pattern to save / load scenes.
+  // This is a temporary solution and will be improved in the future.
+  auto emptyScene = new Qtk::SceneEmpty;
+  window->getQtkWidget()->setScene(new QtkScene(emptyScene));
+
+  window->show();
   return QApplication::exec();
 }

src/app/qtkmainwindow.cpp

@@ -7,7 +7,7 @@
 ##############################################################################*/
 
 #include "qtkmainwindow.h"
-#include "examplescene.h"
+#include "qtkscene.h"
 #include "ui_qtkmainwindow.h"
 
 MainWindow * MainWindow::mainWindow_ = Q_NULLPTR;
@@ -27,7 +27,7 @@ MainWindow::MainWindow(QWidget * parent) : QMainWindow(parent) {
   // Initialize static container for all active QtkWidgets
   auto qtkWidgets = findChildren<Qtk::QtkWidget *>();
   for(auto & qtkWidget : qtkWidgets) {
-    qtkWidget->setScene(new ExampleScene);
+    qtkWidget->setScene(new Qtk::SceneEmpty);
     views_.emplace(qtkWidget->getScene()->getSceneName(), qtkWidget);
     ui_->menuView->addAction(qtkWidget->getActionToggleConsole());
     connect(
@@ -60,6 +60,13 @@ MainWindow * MainWindow::getMainWindow() {
   return mainWindow_;
 }
 
+Qtk::QtkWidget * MainWindow::getQtkWidget(int64_t index) {
+  if(views_.size() <= index) {
+    return Q_NULLPTR;
+  }
+  return views_.begin(index)->second;
+}
+
 Qtk::QtkWidget * MainWindow::getQtkWidget(const QString & name) {
   if(!views_.count(name)) {
     return Q_NULLPTR;

src/app/qtkmainwindow.h

@@ -53,6 +53,8 @@ class MainWindow : public QMainWindow {
      */
     static MainWindow * getMainWindow();
 
+    Qtk::QtkWidget * getQtkWidget(int64_t index = 0);
+
     /**
      * Accessor for retrieving a QtkWidget by it's objectName.
      * This function will not construct a new QtkWidget if none is found.

src/app/qtkscene.cpp

@@ -6,7 +6,7 @@
 ## Contact: shaunrd0@gmail.com  | URL: www.shaunreed.com | GitHub: shaunrd0   ##
 ##############################################################################*/
 
-#include "examplescene.h"
+#include "qtkscene.h"
 #include "resources.h"
 
 using namespace Qtk;
@@ -15,13 +15,14 @@ using namespace Qtk;
  * Constructors, Destructors
  ******************************************************************************/
 
-ExampleScene::ExampleScene() {
-  setSceneName("Example Scene");
+QtkScene::QtkScene(Qtk::Scene * scene) :
+    Qtk::SceneInterface(scene) {
+  setSceneName("Qtk Scene");
   getCamera().getTransform().setTranslation(0.0f, 0.0f, 20.0f);
   getCamera().getTransform().setRotation(-5.0f, 0.0f, 1.0f, 0.0f);
 }
 
-ExampleScene::~ExampleScene() {
+QtkScene::~QtkScene() {
   delete mTestPhong;
   delete mTestSpecular;
   delete mTestDiffuse;
@@ -32,7 +33,7 @@ ExampleScene::~ExampleScene() {
  * Public Member Functions
  ******************************************************************************/
 
-void ExampleScene::init() {
+void QtkScene::init() {
   // Add a skybox to the scene using default cube map images and settings.
   setSkybox(new Qtk::Skybox("Skybox"));
 
@@ -97,7 +98,7 @@ void ExampleScene::init() {
   model->getTransform().scale(0.15f);
 
   model =
-      addObject(new Qtk::Model("scythe", ":/models/models/scythe/scythe.obj"));
+      addObject(new Qtk::Model("My scythe", ":/models/models/scythe/scythe.obj"));
   model->getTransform().setTranslation(-6.0f, 0.0f, -10.0f);
   model->getTransform().rotate(-90.0f, 1.0f, 0.0f, 0.0f);
   model->getTransform().rotate(90.0f, 0.0f, 1.0f, 0.0f);
@@ -387,19 +388,11 @@ void ExampleScene::init() {
   mesh->reallocateTexCoords(mesh->getTexCoords());
 }
 
-void ExampleScene::draw() {
+void QtkScene::draw() {
   // WARNING: We must call the base class draw() function first.
   // + This will handle rendering core scene components like the Skybox.
   Scene::draw();
 
-  for(const auto & model : getModels()) {
-    model->draw();
-  }
-
-  for(const auto & mesh : getMeshes()) {
-    mesh->draw();
-  }
-
   mTestPhong->bindShaders();
   mTestPhong->setUniform(
       "uModelInverseTransposed",
@@ -409,14 +402,14 @@ void ExampleScene::draw() {
       MeshRenderer::getInstance("phongLight")->getTransform().getTranslation());
   mTestPhong->setUniform(
       "uCameraPosition",
-      ExampleScene::getCamera().getTransform().getTranslation());
+      QtkScene::getCamera().getTransform().getTranslation());
   mTestPhong->releaseShaders();
   mTestPhong->draw();
 
   mTestAmbient->bindShaders();
   mTestAmbient->setUniform(
       "uCameraPosition",
-      ExampleScene::getCamera().getTransform().getTranslation());
+      QtkScene::getCamera().getTransform().getTranslation());
   mTestAmbient->releaseShaders();
   mTestAmbient->draw();
 
@@ -430,7 +423,7 @@ void ExampleScene::draw() {
                             .getTranslation());
   mTestDiffuse->setUniform(
       "uCameraPosition",
-      ExampleScene::getCamera().getTransform().getTranslation());
+      QtkScene::getCamera().getTransform().getTranslation());
   mTestDiffuse->releaseShaders();
   mTestDiffuse->draw();
 
@@ -444,12 +437,12 @@ void ExampleScene::draw() {
                             .getTranslation());
   mTestSpecular->setUniform(
       "uCameraPosition",
-      ExampleScene::getCamera().getTransform().getTranslation());
+      QtkScene::getCamera().getTransform().getTranslation());
   mTestSpecular->releaseShaders();
   mTestSpecular->draw();
 }
 
-void ExampleScene::update() {
+void QtkScene::update() {
   auto mySpartan = Model::getInstance("My spartan");
   mySpartan->getTransform().rotate(0.75f, 0.0f, 1.0f, 0.0f);
 
@@ -463,12 +456,12 @@ void ExampleScene::update() {
   alien->setUniform("uLight.position", position);
   alien->setUniform(
       "uCameraPosition",
-      ExampleScene::getCamera().getTransform().getTranslation());
+      QtkScene::getCamera().getTransform().getTranslation());
   auto posMatrix = alien->getTransform().toMatrix();
   alien->setUniform("uMVP.normalMatrix", posMatrix.normalMatrix());
   alien->setUniform("uMVP.model", posMatrix);
-  alien->setUniform("uMVP.view", ExampleScene::getCamera().toMatrix());
-  alien->setUniform("uMVP.projection", ExampleScene::getProjectionMatrix());
+  alien->setUniform("uMVP.view", QtkScene::getCamera().toMatrix());
+  alien->setUniform("uMVP.projection", QtkScene::getProjectionMatrix());
   alien->getTransform().rotate(0.75f, 0.0f, 1.0f, 0.0f);
 
   position = MeshRenderer::getInstance("spartanTestLight")
@@ -478,12 +471,12 @@ void ExampleScene::update() {
   spartan->setUniform("uLight.position", position);
   spartan->setUniform(
       "uCameraPosition",
-      ExampleScene::getCamera().getTransform().getTranslation());
+      QtkScene::getCamera().getTransform().getTranslation());
   posMatrix = spartan->getTransform().toMatrix();
   spartan->setUniform("uMVP.normalMatrix", posMatrix.normalMatrix());
   spartan->setUniform("uMVP.model", posMatrix);
-  spartan->setUniform("uMVP.view", ExampleScene::getCamera().toMatrix());
-  spartan->setUniform("uMVP.projection", ExampleScene::getProjectionMatrix());
+  spartan->setUniform("uMVP.view", QtkScene::getCamera().toMatrix());
+  spartan->setUniform("uMVP.projection", QtkScene::getProjectionMatrix());
   spartan->getTransform().rotate(0.75f, 0.0f, 1.0f, 0.0f);
 
   auto phong = MeshRenderer::getInstance("testPhong");
@@ -494,12 +487,12 @@ void ExampleScene::update() {
   phong->setUniform("uLight.position", position);
   phong->setUniform(
       "uCameraPosition",
-      ExampleScene::getCamera().getTransform().getTranslation());
+      QtkScene::getCamera().getTransform().getTranslation());
   posMatrix = phong->getTransform().toMatrix();
   phong->setUniform("uMVP.normalMatrix", posMatrix.normalMatrix());
   phong->setUniform("uMVP.model", posMatrix);
-  phong->setUniform("uMVP.view", ExampleScene::getCamera().toMatrix());
-  phong->setUniform("uMVP.projection", ExampleScene::getProjectionMatrix());
+  phong->setUniform("uMVP.view", QtkScene::getCamera().toMatrix());
+  phong->setUniform("uMVP.projection", QtkScene::getProjectionMatrix());
   phong->releaseShaders();
 
   // Rotate lighting example cubes

src/app/qtkscene.h

@@ -29,15 +29,15 @@
  *
  * To create your own Scene from scratch see Qtk::Scene.
  */
-class ExampleScene : public Qtk::Scene {
+class QtkScene : public Qtk::SceneInterface {
   public:
     /***************************************************************************
      * Contructors / Destructors
      **************************************************************************/
 
-    ExampleScene();
+    QtkScene(Qtk::Scene * scene);
 
-    ~ExampleScene();
+    ~QtkScene();
 
     /***************************************************************************
      * Inherited Public Overrides

src/app/qtkwidget.h

@@ -100,6 +100,13 @@ namespace Qtk {
        */
       inline Qtk::Scene * getScene() { return mScene; }
 
+      /**
+       * @return Pointer to the QOpenGLDebugLogger attached to this widget.
+       */
+      inline QOpenGLDebugLogger * getOpenGLDebugLogger() {
+        return mDebugLogger;
+      }
+
       /*************************************************************************
        * Setters
        ************************************************************************/

src/app/treeview.cpp

@@ -37,7 +37,7 @@ void Qtk::TreeView::updateView(const Qtk::Scene * scene) {
   mSceneName = scene->getSceneName();
   auto objects = scene->getObjects();
   for(const auto & object : objects) {
-    auto item = new QTreeWidgetItem(QStringList(QString(object->getName())));
+    auto item = new QTreeWidgetItem(QStringList(QString(object->getName().c_str())));
     ui->treeWidget->insertTopLevelItem(0, item);
   }
 }
@@ -48,6 +48,10 @@ void Qtk::TreeView::itemFocus(QTreeWidgetItem * item, int column) {
       MainWindow::getMainWindow()->getQtkWidget(mSceneName)->getScene();
   auto & transform = scene->getCamera().getTransform();
   auto object = scene->getObject(name);
+  if (object == Q_NULLPTR) {
+    qDebug() << "Attempt to get non-existing object with name '" << name
+             << "'\n";
+  }
   Transform3D * objectTransform;
   if(object->getType() == Object::QTK_MESH) {
     objectTransform = &dynamic_cast<MeshRenderer *>(object)->getTransform();

src/qtk/meshrenderer.cpp

@@ -38,7 +38,7 @@ MeshRenderer::MeshRenderer(const char * name, const ShapeBase & shape) :
 }
 
 MeshRenderer::~MeshRenderer() {
-  sInstances.remove(mName);
+  sInstances.remove(mName.c_str());
 }
 
 /*******************************************************************************

src/qtk/model.cpp

@@ -96,7 +96,7 @@ void Model::loadModel(const std::string & path) {
   sortModelMeshes();
 
   // Object finished loading, insert it into ModelManager
-  mManager.insert(getName(), this);
+  mManager.insert(getName().c_str(), this);
 }
 
 void Model::processNode(aiNode * node, const aiScene * scene) {
@@ -200,7 +200,7 @@ ModelMesh Model::processMesh(aiMesh * mesh, const aiScene * scene) {
     textures.insert(textures.end(), normalMaps.begin(), normalMaps.end());
   }
 
-  return {vertices, indices, textures, mVertexShader, mFragmentShader};
+  return {vertices, indices, textures, mVertexShader.c_str(), mFragmentShader.c_str()};
 }
 
 ModelMesh::Textures Model::loadMaterialTextures(

src/qtk/model.h

@@ -58,7 +58,7 @@ namespace Qtk {
         loadModel(mModelPath);
       }
 
-      inline ~Model() override { mManager.remove(getName()); }
+      inline ~Model() override { mManager.remove(getName().c_str()); }
 
       /*************************************************************************
        * Public Methods
@@ -197,7 +197,7 @@ namespace Qtk {
       /** The directory this model and it's textures are stored. */
       std::string mDirectory {};
       /** File names for shaders and 3D model on disk. */
-      const char *mVertexShader, *mFragmentShader, *mModelPath;
+      std::string mVertexShader, mFragmentShader, mModelPath;
   };
 }  // namespace Qtk
 

src/qtk/modelmesh.cpp

@@ -73,7 +73,7 @@ void ModelMesh::initMesh(const char * vert, const char * frag) {
   initializeOpenGLFunctions();
 
   // Create VAO, VBO, EBO
-  mVAO->create();
+  bool status = mVAO->create();
   mVBO->create();
   mEBO->create();
 

src/qtk/object.h

@@ -92,7 +92,7 @@ namespace Qtk {
         return mShape.mVertices;
       }
 
-      [[nodiscard]] inline const char * getName() const { return mName; }
+      [[nodiscard]] inline std::string getName() const { return mName; }
 
       [[nodiscard]] inline const Type & getType() const { return mType; }
 
@@ -160,7 +160,7 @@ namespace Qtk {
       Transform3D mTransform;
       Shape mShape;
       Texture mTexture;
-      const char * mName;
+      std::string mName;
       bool mBound;
       Type mType = QTK_OBJECT;
   };

src/qtk/scene.cpp

@@ -37,6 +37,23 @@ Scene::~Scene() {
  * Public Methods
  ******************************************************************************/
 
+void Scene::draw() {
+  if(!mInit) {
+    initializeOpenGLFunctions();
+    init();
+    mInit = true;
+  }
+  if(mSkybox != Q_NULLPTR) {
+    mSkybox->draw();
+  }
+  for(auto & model : mModels) {
+    model->draw();
+  }
+  for(const auto & mesh : mMeshes) {
+    mesh->draw();
+  }
+}
+
 std::vector<Object *> Scene::getObjects() const {
   // All scene objects must inherit from Qtk::Object.
   std::vector<Object *> objects(mMeshes.begin(), mMeshes.end());
@@ -51,7 +68,7 @@ std::vector<Object *> Scene::getObjects() const {
 
 Object * Scene::getObject(const QString & name) {
   for(auto object : getObjects()) {
-    if(object->getName() == name) {
+    if(object->getName() == name.toStdString()) {
       return object;
     }
   }
@@ -74,24 +91,3 @@ template <> Model * Scene::addObject(Model * object) {
   sceneUpdated(mSceneName);
   return object;
 }
-
-/*******************************************************************************
- * Private Methods
- ******************************************************************************/
-
-void Scene::privateDraw() {
-  if(!mInit) {
-    initializeOpenGLFunctions();
-    init();
-    mInit = true;
-  }
-  if(mSkybox != Q_NULLPTR) {
-    mSkybox->draw();
-  }
-  for(auto & model : mModels) {
-    model->draw();
-  }
-  for(const auto & mesh : mMeshes) {
-    mesh->draw();
-  }
-}

src/qtk/scene.h

@@ -10,6 +10,7 @@
 #define QTK_SCENE_H
 
 #include <QMatrix4x4>
+
 #include <utility>
 
 #include "camera3d.h"
@@ -65,7 +66,7 @@ namespace Qtk {
        *
        * This function is only called when the widget is redrawn.
        */
-      virtual void draw() { privateDraw(); };
+      virtual void draw();
 
       /**
        * Function called to update the QOpenGLWidget. Does not trigger a redraw.
@@ -165,6 +166,7 @@ namespace Qtk {
        */
       inline void setSceneName(QString name) { mSceneName = std::move(name); }
 
+      std::vector<Model *> mModels {};
     signals:
       /**
        * Signal thrown when the scene is modified by adding or removing objects.
@@ -175,16 +177,6 @@ namespace Qtk {
       void sceneUpdated(QString sceneName);
 
     private:
-      /*************************************************************************
-       * Private Methods
-       ************************************************************************/
-
-      /**
-       * Handles drawing members encapsulated by this base class.
-       * Child classes do not need to draw these objects manually.
-       */
-      void privateDraw();
-
       /*************************************************************************
        * Private Members
        ************************************************************************/
@@ -199,8 +191,33 @@ namespace Qtk {
       /* MeshRenderers used simple geometry. */
       std::vector<MeshRenderer *> mMeshes {};
       /* Models used for storing 3D models in the scene. */
-      std::vector<Model *> mModels {};
   };
+
+  class SceneEmpty : public Scene {
+    public:
+      void init() override {
+        setSceneName("Empty Scene");
+      }
+
+      void draw() override { Scene::draw(); }
+
+      void update() override { Scene::update(); }
+  };
+
+  class SceneInterface : public Scene {
+    public:
+      explicit SceneInterface(Scene * scene) : mScene(scene) {}
+
+      void init() override { mScene->init(); }
+
+      void draw() override { mScene->draw(); }
+
+      void update() override { mScene->update(); }
+
+    protected:
+      Scene * mScene;
+  };
+
 }  // namespace Qtk
 
 #endif  // QTK_SCENE_H