start to lay down code

src/CMakeLists.txt

@@ -1,6 +1,8 @@
 cmake_minimum_required(VERSION 3.20)
 add_subdirectory(core)
 
+set(FRONTEND "qt" CACHE INTERNAL "")
+
 if(${FRONTEND} MATCHES "qt")
   add_subdirectory(frontend/qt)
 elseif(${FRONTEND} MATCHES "sdl")

src/frontend/sdl/CMakeLists.txt

@@ -1,2 +1,8 @@
 cmake_minimum_required(VERSION 3.20)
 project(frontend)
+
+find_package(SDL2 REQUIRED)
+
+add_library(frontend Frontend.cpp Frontend.hpp)
+target_include_directories(frontend PUBLIC .)
+target_link_libraries(frontend PUBLIC SDL2)

src/frontend/sdl/Frontend.cpp

@@ -0,0 +1,15 @@
+#include <Frontend.hpp>
+
+namespace natsukashii::frontend {
+App::~App() {
+  SDL_DestroyRenderer(renderer);
+  SDL_DestroyWindow(window);
+  SDL_Quit();
+}
+
+App::App() {
+  SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO);
+  window = SDL_CreateWindow("natukashii", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 800, 600, SDL_WINDOW_SHOWN);
+  renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED);
+}
+}

src/frontend/sdl/Frontend.hpp

@@ -0,0 +1,12 @@
+#pragma once
+#include <SDL2/SDL.h>
+
+namespace natsukashii::frontend {
+struct App {
+  ~App();
+  App();
+private:
+  SDL_Window *window = nullptr;
+  SDL_Renderer *renderer = nullptr;
+};
+}

src/main.cpp

@@ -1,3 +1,8 @@
-#include <BaseCore.hpp>
+#include <Frontend.hpp>
 
-int main() {}
+using namespace natsukashii::frontend;
+
+int main() {
+  App app;
+  return 0;
+}