refactored imgui in core, applayer working and drawing with imgui

SakuraVNE/src/AppLayer.cpp

@@ -1 +1,19 @@
 #include "AppLayer.h"
+#include "Application.h"
+#include "Layer.h"
+#include "imgui.h"
+
+AppLayer::AppLayer() : Layer("AppLayer", true) {}
+
+void AppLayer::OnImGuiRender() {
+    ImGuiIO &io = ImGui::GetIO();
+    bool demoWindow = true;
+    ImGui::Begin("Framerate");
+    ImGui::ShowDemoWindow(&demoWindow);
+    ImGui::Text("Application avg %.3f ms/frame (%.1f FPS)", 1000.0f / io.Framerate, io.Framerate);
+
+    if (ImGui::Button("Quit")) {
+        Application::Get().SetRunningState(false);
+    }
+    ImGui::End();
+}

SakuraVNE/src/AppLayer.h

@@ -1,8 +1,10 @@
 #include "Layer.h"
 
-class AppLayer : SakuraVNE::Layer {
+class AppLayer : public SakuraVNE::Layer {
+public:
     AppLayer();
-    virtual ~AppLayer();
+    virtual ~AppLayer() = default;
+    virtual void OnImGuiRender() override;
 
 private:
     // bool OnMouseButtonPressed(Core::MouseButtonPressedEvent &event);

SakuraVNE/src/main.cpp

@@ -1,3 +1,4 @@
+#include "AppLayer.h"
 #include "Application.h"
 
 int main(int argc, char *argv[]) {
@@ -8,7 +9,7 @@ int main(int argc, char *argv[]) {
     appData.windowdata.height = 720;
 
     Application app(appData);
-    // app.PushLayer<AppLayer>();
+    app.PushLayer<AppLayer>();
     app.Run();
 
     return 0;