Handle keyboard in QML

src/magnum_render.cpp

@@ -41,10 +41,26 @@ void MagnumRenderer::count(int count) {
     m_subjectDrawable->count(count);
 }
 
-Containers::Optional<ArcBallCamera> MagnumRenderer::camera() {
+Containers::Optional<ArcBallCamera>& MagnumRenderer::camera() {
   return m_camera;
 }
 
+float MagnumRenderer::lagging() {
+  if (m_camera)
+    return m_camera->lagging();
+  else
+    return 0.f;
+}
+
+void MagnumRenderer::lagging(float lagging) {
+  if (m_camera)
+    m_camera->setLagging(lagging);
+}
+
+/**
+ * @brief MagnumRenderer::lazyInitialize
+ *
+ */
 void MagnumRenderer::lazyInitialize() {
   if (m_init) return;
 
@@ -97,6 +113,10 @@ void MagnumRenderer::reset(Platform::GLContext *ctx,
   m_ctx = ctx;
 }
 
+/**
+ * @brief MagnumRenderer::prepGLState
+ *
+ */
 void MagnumRenderer::prepGLState() {
   GL::Renderer::setClearColor(COLOR_BG);
   GL::Renderer::enable(GL::Renderer::Feature::DepthTest);
@@ -115,7 +135,6 @@ void MagnumRenderer::prepGLState() {
 void MagnumRenderer::render() {
   m_ctx->resetState(GL::Context::State::ExitExternal);
   prepGLState();
-  // ---
 
   m_FBO.bind();
   m_FBO.clear(GL::FramebufferClear::Color |
@@ -128,7 +147,7 @@ void MagnumRenderer::render() {
    *  bool cameraChanged = m_camera->update();
    *  m_camera->draw(m_drawables);
    *  if (cameraChanged) {
-   *    redraw();
+   *    redraw(); // should call back to MagnumItem::update()
    *  } */
 
   // ---
@@ -145,16 +164,22 @@ void GridDrawable::draw(const Matrix4 &transformation,
 
 void SubjectDrawable::draw(const Matrix4 &transformation,
                            SceneGraph::Camera3D &camera) {
+  // We only need to do this once in this draw call
   m_shader
       .setNormalMatrix(transformation.normalMatrix())
       .setProjectionMatrix(camera.projectionMatrix());
+
   static const float width = 3.f;
   float x = -float(m_count)/2.f * width + width/2.f;
+
   for (int i = 0; i < m_count; i++) {
+    // Change hue depending on position
     const auto color = Color3::fromHsv({Rad(m_hue+float(i)*.2f), 1.f, 1.f});
     m_shader
         .setDiffuseColor(color)
         .setAmbientColor(Color3::fromHsv({color.hue(), 1.0f, 0.3f}));
+
+    // Move in +x
     m_shader
         .setTransformationMatrix(
           transformation *