application refactoring

SakuraCore/src/Application.cpp

@@ -1,17 +1,25 @@
 #include "Application.h"
 #include "Event.h"
+#include "Layer.h"
 #include "Log.h"
+#include "SDL3/SDL_main.h"
 #include "SDL3/SDL_render.h"
 #include "imgui.h"
 #include "imgui_impl_sdl3.h"
 #include "imgui_impl_sdlrenderer3.h"
 
-Application::Application() : m_Window(nullptr), m_Renderer(nullptr), m_Surface(nullptr), m_isRunning(false) {}
+#define SDL_MAIN_HANDLED 1
+
+Application *Application::s_Instance = nullptr;
+
+Application::Application() : m_Window(nullptr), m_Renderer(nullptr), m_Surface(nullptr), m_isRunning(false) { SDL_SetMainReady(); }
 Application::~Application() { Shutdown(); }
 
 bool Application::Init() {
     SetRunningState(true);
 
+    s_Instance = this;
+
     SakuraVNE::Log::Init();
     LOG_INFO("Initialized logger library");
 
@@ -61,29 +69,23 @@ bool Application::Init() {
 
     SDL_SetRenderVSync(m_Renderer, 1);
 
-    // Imgui init
-    IMGUI_CHECKVERSION();
-    ImGui::CreateContext();
-
-    ImGuiIO &io = ImGui::GetIO();
-    io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;
-
-    ImGui::StyleColorsDark();
-
-    ImGui_ImplSDL3_InitForSDLRenderer(m_Window, m_Renderer);
-    ImGui_ImplSDLRenderer3_Init(m_Renderer);
+    m_ImGuiLayer = new SakuraVNE::ImGuiLayer();
+    PushOverlay(m_ImGuiLayer);
 
     return true;
 }
 
 void Application::Run() {
-    bool demoWindowShow = false;
-    bool showOtherWindow = false;
-    ImVec4 clearColor = ImVec4(0.45f, 0.55f, 0.60f, 1.00f);
-
     ImGuiIO &io = ImGui::GetIO();
 
     while (GetRunningState()) {
+
+        float time = 0;
+
+        for (auto layer : m_LayerStack) {
+            layer->OnFrame(time);
+        }
+
         SDL_Event event;
 
         while (SDL_PollEvent(&event)) {
@@ -104,45 +106,11 @@ void Application::Run() {
                 SetSDLWindowSurface(SDL_GetWindowSurface(GetSDLWindow()));
             }
         }
-
-        ImGui_ImplSDLRenderer3_NewFrame();
-        ImGui_ImplSDL3_NewFrame();
-        ImGui::NewFrame();
-
-        if (demoWindowShow) {
-            ImGui::ShowDemoWindow(&demoWindowShow);
-        }
-
-        // imgui demo window stuff or frame stuff
-        static float f = 0.0f;
-        static int counter = 0;
-
-        ImGui::Begin("Hello World!"); // creates window and add later stuff to it
-
-        ImGui::Text("text stuff");
-        ImGui::Checkbox("Demo checkbox", &showOtherWindow);
-
-        ImGui::SliderFloat("float", &f, 0.0f, 1.0f);
-        ImGui::ColorEdit3("clear color edit", (float *)&clearColor);
-
-        if (ImGui::Button("Button"))
-            counter++;
-
-        ImGui::SameLine();
-        ImGui::Text("counter = %d", counter);
-
-        ImGui::Text("Application avg %.3f ms/frame (%.1f FPS)", 1000.0f / io.Framerate, io.Framerate);
-
-        if (ImGui::Button("Quit")) {
-            SetRunningState(false);
-        }
-
-        ImGui::End();
-
+        //
         // Rendering
         ImGui::Render();
         SDL_SetRenderScale(m_Renderer, io.DisplayFramebufferScale.x, io.DisplayFramebufferScale.y);
-        SDL_SetRenderDrawColor(m_Renderer, (Uint8)(clearColor.x * 255), (Uint8)(clearColor.y * 255), (Uint8)(clearColor.z * 255), (Uint8)(clearColor.w * 255));
+        SDL_SetRenderDrawColor(m_Renderer, (Uint8)255, (Uint8)255, (Uint8)255, (Uint8)255);
         SDL_RenderClear(m_Renderer);
         ImGui_ImplSDLRenderer3_RenderDrawData(ImGui::GetDrawData(), m_Renderer);
         SDL_RenderPresent(m_Renderer);
@@ -152,10 +120,6 @@ void Application::Run() {
 void Application::Shutdown() {
     LOG_WARN("Shutting down the application!");
 
-    ImGui_ImplSDLRenderer3_Shutdown();
-    ImGui_ImplSDL3_Shutdown();
-    ImGui::DestroyContext();
-
     SDL_DestroyRenderer(m_Renderer);
 
     // Destroy window
@@ -164,3 +128,12 @@ void Application::Shutdown() {
     // Quit SDL subsystems
     SDL_Quit();
 }
+
+void Application::PushLayer(SakuraVNE::Layer *layer) {
+    m_LayerStack.PushLayer(layer);
+    layer->OnAttach();
+}
+void Application::PushOverlay(SakuraVNE::Layer *layer) {
+    m_LayerStack.PushOverLay(layer);
+    layer->OnAttach();
+}

SakuraCore/src/Application.h

@@ -1,7 +1,12 @@
 #pragma once
 
+#include "Layer.h"
+#include "LayerStack.h"
 #include "SDL3/SDL.h"
+#include "imguilayer.h"
 
+// TODO: Move this out to its own class(?) so it can be defined by the application
+// maybe this could be used as a fallback if the app did not define one
 struct WindowData {
     int width = 1280;
     int height = 720;
@@ -19,14 +24,20 @@ public:
     void Run();
     void Shutdown();
 
+    void PushLayer(SakuraVNE::Layer *);
+    void PushOverlay(SakuraVNE::Layer *);
+
     inline WindowData &GetWindowData() { return m_WindowData; }
     inline SDL_Window *GetSDLWindow() { return m_Window; }
+    inline SDL_Renderer *GetSDLRenderer() { return m_Renderer; }
     inline SDL_Surface *GetSDLWindowSurface() { return m_Surface; }
     inline void SetSDLWindowSurface(SDL_Surface *newSurface) { m_Surface = newSurface; }
 
     bool &GetRunningState() { return m_isRunning; }
     void SetRunningState(bool isRunning) { m_isRunning = isRunning; }
 
+    static Application &Get() { return *s_Instance; }
+
 private:
     SDL_Window *m_Window;
     SDL_Surface *m_Surface;
@@ -35,4 +46,9 @@ private:
     WindowData m_WindowData;
 
     bool m_isRunning;
+
+    SakuraVNE::LayerStack m_LayerStack;
+
+    static Application *s_Instance;
+    SakuraVNE::ImGuiLayer *m_ImGuiLayer;
 };

SakuraCore/src/LayerStack.h

@@ -1,6 +1,7 @@
 #pragma once
 
 #include "Layer.h"
+#include <iterator>
 #include <vector>
 
 namespace SakuraVNE {
@@ -14,6 +15,16 @@ public:
     void PushOverLay(Layer *layer);
     void PopOverlay(Layer *layer);
 
+    std::vector<Layer *>::iterator begin() { return m_LayerStack.begin(); }
+    std::vector<Layer *>::iterator end() { return m_LayerStack.end(); }
+    std::vector<Layer *>::reverse_iterator rbegin() { return m_LayerStack.rbegin(); }
+    std::vector<Layer *>::reverse_iterator rend() { return m_LayerStack.rend(); }
+
+    std::vector<Layer *>::const_iterator begin() const { return m_LayerStack.begin(); }
+    std::vector<Layer *>::const_iterator end() const { return m_LayerStack.end(); }
+    std::vector<Layer *>::const_reverse_iterator rbegin() const { return m_LayerStack.rbegin(); }
+    std::vector<Layer *>::const_reverse_iterator rend() const { return m_LayerStack.rend(); }
+
 #ifdef DEBUG
     // this is only used for the tests for now, so it will be taken out of the release build
     inline const std::vector<Layer *> &GetLayers() const { return m_LayerStack; }

SakuraCore/src/imguilayer.cpp

@@ -0,0 +1,46 @@
+#include "imguilayer.h"
+#include "Application.h"
+#include "Log.h"
+#include "imgui.h"
+#include "imgui_impl_sdl3.h"
+#include "imgui_impl_sdlrenderer3.h"
+
+namespace SakuraVNE {
+ImGuiLayer::ImGuiLayer() : Layer("ImGuiLayer") {}
+
+void ImGuiLayer::OnAttach() {
+    // Imgui init
+    IMGUI_CHECKVERSION();
+    ImGui::CreateContext();
+
+    ImGuiIO &io = ImGui::GetIO();
+    io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;
+
+    ImGui::StyleColorsDark();
+
+    ImGui_ImplSDL3_InitForSDLRenderer(Application::Get().GetSDLWindow(), Application::Get().GetSDLRenderer());
+    ImGui_ImplSDLRenderer3_Init(Application::Get().GetSDLRenderer());
+
+    LOG_INFO("Imgui layer OnAttach ran");
+}
+
+void ImGuiLayer::OnDetach() {
+    ImGui_ImplSDLRenderer3_Shutdown();
+    ImGui_ImplSDL3_Shutdown();
+    ImGui::DestroyContext();
+    LOG_WARN("Imgui on detach ran");
+}
+
+void ImGuiLayer::Begin() {
+    ImGui_ImplSDLRenderer3_NewFrame();
+    ImGui_ImplSDL3_NewFrame();
+    ImGui::NewFrame();
+}
+
+void ImGuiLayer::End() {
+    ImGuiIO &io = ImGui::GetIO();
+
+    Application &app = Application::Get();
+    io.DisplaySize = ImVec2((float)app.GetWindowData().width, (float)app.GetWindowData().height);
+}
+} // namespace SakuraVNE

SakuraCore/src/imguilayer.h

@@ -0,0 +1,21 @@
+#pragma once
+
+#include "Layer.h"
+
+namespace SakuraVNE {
+class ImGuiLayer : public Layer {
+public:
+    ImGuiLayer();
+    ~ImGuiLayer() = default;
+
+    // virtual void OnStart() override;
+    // virtual void OnFrame(float timestamp) override;
+    // virtual void OnEnd() override;
+    virtual void OnAttach() override;
+    virtual void OnDetach() override;
+    // virtual void OnEvent() override;
+
+    void Begin();
+    void End();
+};
+} // namespace SakuraVNE