Factor out more resources.

+ Use QOpenGLShader to get compiled shader code in TreeView.
+ Remove last remaining Qt resources dependency in libqtk.
+ shaders.h in libqtk to define default GLSL shader programs.

src/app/CMakeLists.txt

@@ -17,6 +17,8 @@ if (QTK_GUI_SCENE)
       qtkscene.cpp qtkscene.h
       main.cpp
   )
+
+  qt6_add_big_resources(QTK_GUI_SOURCES "${QTK_RESOURCES}/resources.qrc")
 else()
   # The scene will use a default skybox with no models or examples.
   # Models can be added by click-and-dragging an .obj into the scene.
@@ -24,6 +26,11 @@ else()
       qtkmainwindow.cpp qtkmainwindow.h qtkmainwindow.ui
       main.cpp
   )
+
+  qt6_add_big_resources(
+      QTK_GUI_SOURCES
+      "${QTK_RESOURCES}/minimal_resources.qrc"
+  )
 endif()
 
 qt_add_executable(qtk_gui ${QTK_GUI_SOURCES})

src/app/main.cpp

@@ -10,17 +10,9 @@
 
 #include "qtkmainwindow.h"
 
-#ifdef QTK_GUI_SCENE
-#include "qtkscene.h"
-using AppScene = QtkScene;
-#else
-using AppScene = EmptyScene;
-#endif
-
 int main(int argc, char * argv[])
 {
-  Q_INIT_RESOURCE(resources);
-
+  initResources();
   QApplication a(argc, argv);
 
   auto window = MainWindow::getMainWindow();

src/app/qtkmainwindow.h

@@ -62,6 +62,27 @@ class EmptyScene : public Qtk::Scene
     }
 };
 
+/*
+ * Conditionally include the QtkScene header if the example is enabled.
+ * Set AppScene type to use in main() for creating the scene.
+ * Define helper function to initialize Qt resources for the application.
+ *    These resources are different based on if the example is enabled.
+ */
+#ifdef QTK_GUI_SCENE
+#include "qtkscene.h"
+using AppScene = QtkScene;
+inline void initResources()
+{
+  Q_INIT_RESOURCE(resources);
+}
+#else
+using AppScene = EmptyScene;
+inline void initResources()
+{
+  Q_INIT_RESOURCE(minimal_resources);
+}
+#endif
+
 /**
  * MainWindow class to provide an example of using a QtkWidget within a Qt
  * window application.

src/app/qtkscene.cpp

@@ -42,8 +42,8 @@ void QtkScene::init()
   // Clone qtk-resources if it doesn't already exist.
   QDir repoDir("resources/");
   if (!repoDir.exists()) {
-    qDebug() << "Cloning qtk-resources repository to '"
-             << repoDir.absolutePath() << "'...";
+    qDebug() << "Cloning qtk-resources repository to " << repoDir.absolutePath()
+             << "...";
 
     // Run git clone
     QProcess gitProcess;