Add Input class

- Add Input class used to poll mouse and key button states
- Add additional example systems to the Scene

CopiumEngine/src/copium/example/CameraUpdateSystem.h

@@ -0,0 +1,52 @@
+#pragma once
+
+#include "copium/ecs/System.h"
+#include "copium/example/Components.h"
+#include "copium/event/EventSignal.h"
+#include "copium/event/WindowResizeEvent.h"
+
+#include <glm/gtc/matrix_transform.hpp>
+
+namespace Copium
+{
+  class CameraUpdateSystem : public System<CameraC, TransformC>
+  {
+  private:
+    glm::mat4* viewMatrix;
+    glm::mat4* projectionMatrix;
+    glm::mat4* invPvMatrix;
+  public:
+    CameraUpdateSystem(glm::mat4* viewMatrix, glm::mat4* projectionMatrix, glm::mat4* invPvMatrix)
+      : viewMatrix{viewMatrix}, projectionMatrix{projectionMatrix}, invPvMatrix{invPvMatrix}
+    {}
+
+    void RunEntity(Entity entity, CameraC& camera, TransformC& transform)
+    {
+      *projectionMatrix = glm::ortho(camera.projection.l, camera.projection.r, camera.projection.b, camera.projection.t);
+      *viewMatrix = glm::translate(glm::scale(glm::mat4{1}, glm::vec3{1.0f / transform.size.x, 1.0f / transform.size.y, 1.0f}), glm::vec3{-transform.position.x, -transform.position.y, 0.0f});
+      *invPvMatrix = glm::inverse((*projectionMatrix) * (*viewMatrix));
+    }
+
+    void RunEntity(const Signal& signal, Entity entity, CameraC& camera, TransformC& transform) override
+    {
+      if (camera.staticBoundingBox)
+        return;
+
+      if (signal.GetId() != EventSignal::GetIdStatic())
+        return;
+
+      const EventSignal& eventSignal = static_cast<const EventSignal&>(signal);
+      switch (eventSignal.GetEvent().GetType())
+      {
+      case EventType::WindowResize:
+      {
+        const WindowResizeEvent& windowResizeEvent = static_cast<const WindowResizeEvent&>(eventSignal.GetEvent());
+        float aspect = windowResizeEvent.GetWidth() / (float)windowResizeEvent.GetHeight();
+        camera.projection.r = aspect;
+        camera.projection.l = -aspect;
+        break;
+      }
+      }
+    }
+  };
+}