browser: start on gui and sdl

browser/main.cpp

@@ -1,3 +1,83 @@
+#include "SDL_events.h"
+#include "SDL_pixels.h"
+#include "SDL_rect.h"
+#include "SDL_render.h"
+#include "SDL_video.h"
+#include "utils/all.hpp"
+#include <SDL.h>
 #include <fmt/core.h>
+#include <memory>
 
-int main() { fmt::print("browser: hello world!\n"); }
+class GUI {
+public:
+    GUI(const GUI&) = delete;
+    auto operator=(const GUI&) -> GUI& = delete;
+    GUI(GUI&&) = delete;
+    auto operator=(GUI&&) -> GUI& = delete;
+    ~GUI()
+    {
+        SDL_DestroyWindow(window);
+        SDL_DestroyRenderer(renderer);
+        SDL_Quit();
+    };
+    friend auto std::make_unique<GUI>(SDL_Window*&, SDL_Renderer*&)
+        -> std::unique_ptr<GUI>;
+    static auto create() noexcept -> Result<std::unique_ptr<GUI>, void>
+    {
+        if (SDL_Init(SDL_INIT_VIDEO) != 0)
+            return {};
+        SDL_Window* window = nullptr;
+        SDL_Renderer* renderer = nullptr;
+        if (SDL_CreateWindowAndRenderer(1280, 720, 0, &window, &renderer) != 0)
+            return {};
+        return std::make_unique<GUI>(window, renderer);
+    }
+    auto should_exit() noexcept -> bool
+    {
+        SDL_Event event;
+        bool should_exit = false;
+        while (SDL_PollEvent(&event) != 0) {
+            if (event.type == SDL_QUIT)
+                should_exit = true;
+        }
+        return should_exit;
+    }
+    auto set_background_color(uint8_t r, uint8_t g, uint8_t b) noexcept -> void
+    {
+        SDL_SetRenderDrawColor(renderer, r, g, b, SDL_ALPHA_OPAQUE);
+        SDL_RenderClear(renderer);
+    }
+
+    auto create_rect(SDL_Rect rect, uint8_t r, uint8_t g, uint8_t b) noexcept
+        -> void
+    {
+        SDL_SetRenderDrawColor(renderer, r, g, b, SDL_ALPHA_OPAQUE);
+        SDL_RenderFillRect(renderer, &rect);
+    }
+
+    auto update_gui() noexcept -> void { SDL_RenderPresent(this->renderer); }
+
+private:
+    GUI(SDL_Window* window, SDL_Renderer* renderer)
+        : window { window }
+        , renderer { renderer }
+    { }
+    SDL_Window* window;
+    SDL_Renderer* renderer;
+};
+
+auto main() -> int
+{
+    // test
+    fmt::print("browser: hello world!\n");
+    auto gui = GUI::create().unwrap();
+    while (true) {
+        bool should_exit = gui->should_exit();
+        if (should_exit)
+            break;
+        gui->set_background_color(100, 180, 220);
+        SDL_Rect rect = { .x = 0, .y = 0, .w = 50, .h = 50 };
+        gui->create_rect(rect, 255, 0, 0);
+        gui->update_gui();
+    }
+}