Add SDL example

examples/sdl_app/src/sdl_app.cppm

@@ -0,0 +1,89 @@
+module;
+
+#include <iostream>
+#include <string>
+#include <SDL3/SDL.h>
+
+import sprite;
+
+export module sdl_app;
+
+export {
+    struct AppState {
+        SDL_Window* window = nullptr;
+        SDL_Renderer* renderer = nullptr;
+        Sprite* sprite = nullptr;
+    };
+
+    SDL_AppResult sdl_panic(
+        const std::string& error_prefix,
+        SDL_Window* window = nullptr,
+        SDL_Renderer* renderer = nullptr
+    ) {
+        std::cerr << error_prefix << ": " << SDL_GetError() << std::endl;
+
+        if (renderer != nullptr) {
+            SDL_DestroyRenderer(renderer);
+        }
+        if (window != nullptr) {
+            SDL_DestroyWindow(window);
+        }
+
+        SDL_Quit();
+        return SDL_APP_FAILURE;
+    }
+
+    SDL_AppResult sdl_app_init(AppState* app_state) {
+        if (!SDL_Init(SDL_INIT_VIDEO | SDL_INIT_EVENTS)) {
+            return sdl_panic("SDL_Init error");
+        }
+
+        app_state->window = SDL_CreateWindow("BuildSystemTest", 640, 480, 0);
+        if (app_state->window == nullptr) {
+            return sdl_panic("SDL_CreateWindow error");
+        }
+
+        app_state->renderer = SDL_CreateRenderer(app_state->window, nullptr);
+        if (app_state->renderer == nullptr) {
+            return sdl_panic("SDL_CreateRenderer error", app_state->window);
+        }
+
+        try {
+            app_state->sprite = new Sprite(app_state->renderer, "assets/neocat.png", 100, 100);
+        }
+        catch (const std::runtime_error& e) {
+            return sdl_panic(e.what(), app_state->window, app_state->renderer);
+        }
+
+        return SDL_APP_CONTINUE;
+    }
+
+    SDL_AppResult sdl_app_event(const AppState* app_state, const SDL_Event* event) {
+        if (event->type == SDL_EVENT_QUIT) {
+            return SDL_APP_SUCCESS;
+        }
+
+        if (event->type == SDL_EVENT_MOUSE_MOTION) {
+            app_state->sprite->move(
+                event->motion.x - 50,
+                event->motion.y - 50
+            );
+        }
+
+        return SDL_APP_CONTINUE;
+    }
+
+    SDL_AppResult sdl_app_iterate(const AppState* app_state) {
+        SDL_RenderClear(app_state->renderer);
+        app_state->sprite->render(app_state->renderer);
+        SDL_RenderPresent(app_state->renderer);
+
+        return SDL_APP_CONTINUE;
+    }
+
+    void sdl_app_shutdown(const AppState* app_state) {
+        delete app_state->sprite;
+        SDL_DestroyRenderer(app_state->renderer);
+        SDL_DestroyWindow(app_state->window);
+    }
+}