Issue/24 (#549)

* Implemented property animation mechanism
 * Added easing functions to Ghoul and make them usable in animation
 * Make sure that we don't leave properties around if SceneGraphNodes are deleted
 * Adding opacity settings to base renderables

modules/base/rendering/renderablemodel.cpp

@@ -123,6 +123,10 @@ RenderableModel::RenderableModel(const ghoul::Dictionary& dictionary)
         "RenderableModel"
     );
 
+    addProperty(_opacity);
+    registerUpdateRenderBinFromOpacity();
+
+
     if (dictionary.hasKey(KeyGeometry)) {
         std::string name = dictionary.value<std::string>(SceneGraphNode::KeyName);
         ghoul::Dictionary dict = dictionary.value<ghoul::Dictionary>(KeyGeometry);
@@ -163,6 +167,7 @@ void RenderableModel::initializeGL() {
         absPath("${MODULE_BASE}/shaders/model_fs.glsl")
     );
 
+    _uniformCache.opacity = _programObject->uniformLocation("opacity");
     _uniformCache.directionToSunViewSpace = _programObject->uniformLocation(
         "directionToSunViewSpace"
     );
@@ -176,6 +181,8 @@ void RenderableModel::initializeGL() {
         "performShading"
     );
     _uniformCache.texture = _programObject->uniformLocation("texture1");
+
+
     loadTexture();
 
     _geometry->initialize(this);
@@ -197,6 +204,8 @@ void RenderableModel::deinitializeGL() {
 void RenderableModel::render(const RenderData& data, RendererTasks&) {
     _programObject->activate();
 
+    _programObject->setUniform(_uniformCache.opacity, _opacity);
+
     // Model transform and view transform needs to be in double precision
     glm::dmat4 modelTransform =
         glm::translate(glm::dmat4(1.0), data.modelTransform.translation) * // Translation
@@ -244,6 +253,7 @@ void RenderableModel::update(const UpdateData&) {
     if (_programObject->isDirty()) {
         _programObject->rebuildFromFile();
 
+        _uniformCache.opacity = _programObject->uniformLocation("opacity");
         _uniformCache.directionToSunViewSpace = _programObject->uniformLocation(
             "directionToSunViewSpace"
         );