#include <stdio.h>
#include <assert.h>

#include <SDL3/SDL.h>
#include <glad/gl.h>

int main()
{
  int ret;
  SDL_Window * window;

  ret = SDL_Init(SDL_INIT_VIDEO);
  assert(ret == true);

  SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
  SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
  SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 3);

  window = SDL_CreateWindow("main",
                            640, // w
                            480, // h
                            SDL_WINDOW_OPENGL);
  assert(window != NULL);

  SDL_GLContext context = SDL_GL_CreateContext(window);
  assert(context != NULL);
  int version = gladLoadGL((GLADloadfunc)SDL_GL_GetProcAddress);
  assert(version != 0);

  while (1) {
    SDL_Event event;
    while (SDL_PollEvent(&event)) {
      switch (event.type) {
      case SDL_EVENT_QUIT:
        goto exit;
      case SDL_EVENT_KEY_DOWN:
        if (event.key.key == SDLK_ESCAPE)
          goto exit;
        break;
      default:
        break;
      }
    }

    glClearColor(0.1, 0.2, 0.3, 1.0);
    glClear(GL_COLOR_BUFFER_BIT);

    SDL_GL_SwapWindow(window);
  }
 exit:
  SDL_GL_DestroyContext(context);
  SDL_DestroyWindow(window);
  SDL_Quit();
}