ECS slides

slides.tex

@@ -6,6 +6,8 @@
 
 \usetheme{metropolis}
 
+\usepackage{outlines}
+
 \usepackage{minted}
 \setminted{fontsize=\footnotesize,samepage=true}
 %\usepackage{xcolor}
@@ -66,12 +68,69 @@ Hate
     \item git-modules - do not bloat contributions
 }
 
-\begin{frame}[allowframebreaks, fragile]{We made an ECS - almost?}
+\begin{frame}[allowframebreaks, fragile]{We made an ECS}
 Why an ECS - Entity Component System?
 \begin{itemize}
     \item Encourages reusable code
+    \item "Plug-and-play" to add functionality
+    \item We found a video tutorial series for it
+    \item Simplified implementation: Entities propagate updates to the components
 \end{itemize}
 \end{frame}
+\note[itemize]{
+    \item Reusable code mainly on engine side, but also applies to game dev components
+    \item plug and play mostly an advantage for game dev - i.e. "I want physics, here are physics"
+    \item \say{video series} - tease issue of abruptly ending
+    \item Components usually only have data, and are querried by the system (hence ecS)
+    \item System part used for rendering
+}
+\begin{frame}[allowframebreaks, fragile]{We made an ECS - Implementation}
+\begin{minted}[linenos,autogobble,samepage=false]{c++}
+class Entity {
+private:
+    std::vector<std::unique_ptr<Component>> components;
+    ComponentArray componentArray = {};
+    ComponentBitSet componentBitSet;
+public:
+    void update(uint_fast16_t diffTime) const;
+    template <typename T> bool hasComponent() const {
+        return componentBitSet[getComponentTypeID<T>()];
+    }
+    template <typename T> T& getComponent() const {
+        auto ptr(componentArray[getComponentTypeID<T>()]);
+        return *static_cast<T*>(ptr);
+    }
+    template <typename T, typename...TArgs> T& addComponent(TArgs&&...mArgs) {
+        T* c(new T(std::forward<TArgs>(mArgs)...));
+        c->entity = this;
+        std::unique_ptr<Component> uPtr{ c };
+        this->components.emplace_back(std::move(uPtr));
+
+        componentArray[getComponentTypeID<T>()] = c;
+        componentBitSet[getComponentTypeID<T>()] = true;
+
+        c->init();
+        return *c;
+    };
+};
+\end{minted}
+\end{frame}
+\note[itemize]{
+    \item appologize for formatting - for the sake of compactness
+    \item TypeID: increments through all components - copied from video tutorial
+    \item NOT beginner friendly
+}
+\begin{frame}[allowframebreaks, fragile]{We made an ECS - Usage}
+Very easy to use:
+\begin{minted}[linenos,autogobble]{c++}
+auto& projectile(this->manager->addEntity());
+projectile.addComponent<TransformComponent>(pos.x, pos.y, 32, 32, scale);
+projectile.addComponent<SpriteComponent>(texture, 4); // 4 => zIndex
+projectile.addComponent<ProjectileComponent>(range, speed, velocity, owner);
+projectile.addComponent<ColliderComponent>(0.6f);
+\end{minted}
+\end{frame}
+\note{mention: this ease of use is our goal}
 \begin{frame}[allowframebreaks, fragile]{Memory Management}
 \begin{minted}[linenos,autogobble]{c++}
 class Manager
@@ -99,7 +158,7 @@ Does that solve memory management? Not quite:
 \end{frame}
 
 %code example
-\begin{frame}[fragile]
+\begin{frame}[fragile]{Hello, World!}
 \begin{minted}[linenos,autogobble]{c}
 #include <stdio.h>