[ Table of Contents ]
  + 1. XSUI Updates
    + 1.1. Simple Setup
    + 1.2. Immediate Mode
  + 2. grug: An interesting little modding language/framework

int main(void) {
	// init sdl
	ASSERT(SDL_Init(SDL_INIT_VIDEO) == 0);
	ASSERT(TTF_Init() == 0);
	SDL_Window *win = SDL_CreateWindow("XSTD UI Test", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 1200, 800, SDL_WINDOW_SHOWN | SDL_WINDOW_RESIZABLE);
	ASSERT(win != NULL);
	SDL_Renderer *rend = SDL_CreateRenderer(win, -1, SDL_RENDERER_ACCELERATED);
	ASSERT(rend != NULL);
	TTF_Font *font = TTF_OpenFont("./test_assets/LiberationSans.ttf", 32);
	ASSERT(font != NULL);
	// init xstd
	xstd_allocator_t *ally = xstd_c_allocator();
	// init xsre
	xsre_ctx_t *xrend = xsre_sdl2_ctx(rend);
	xsre_font_t *xfont = xsre_sdl2_font(font);
	xsre_listener_list_t *list = xsre_listener_list_new(ally);
	// init xsui
	xsui_state_t *uistate = xsui_state_new(ally, list, xrend, xfont, XSUI_DARK_THEME);
	// SDL event loop
	bool button_has_been_clicked = false;
	while(true) {
		SDL_Event e;
		while(SDL_PollEvent(&e)) {
			xsre_sdl2_send_event(list, &e);
			switch(e.type) {
				case SDL_QUIT:
					goto quit;
				default:
					break;
			}
		}
		SDL_SetRenderDrawColor(rend, 0, 0, 0, 0);
		SDL_RenderClear(rend);
		// UI rendering code goes here
		SDL_RenderPresent(rend);
	}
	quit:
	xsui_state_destroy(uistate);
	xsre_ctx_destroy(xrend);
	xsre_listener_list_destroy(list);
	xstd_allocator_destroy(ally);
	TTF_CloseFont(font);
	SDL_DestroyRenderer(rend);
	SDL_DestroyWindow(win);
	SDL_Quit();
}

void settings(xsui_setup_settings_t *settings, void *data) {
	// code to set some initial settings goes here
	settings->font_path = "./test_assets/LiberationSans.ttf";
	settings->font_size = 32;
}
void setup(xsui_state_t *ui, xstd_allocator_t *ally, void *data) {
	// Post-initialization setup code goes here
}
void draw(xsui_state_t *ui, xstd_allocator_t *ally, void *data) {
	// UI rendering code goes here
}

int main(void) {
	return xsui_setup(NULL, &settings, &setup, &draw);
}

static void on_button_pressed(xsui_frame_t *frame, void *data) {
	printf("I have been clicked!");
}
int main(void) {
 // ... initialization code ...
	// Note: The "vbox" string below is a unique ID for the frame. Unique IDs are 
	// something I decided to remove when moving to immediate mode.
	xsui_frame_t *vbox = xsui_box_new(ui, NULL, STRING("vbox"), 0);
	xsui_frame_set_desired_pos(vbox, 50, 50);
	xsui_frame_set_desired_size(vbox, 500, 0);
		xsui_label_new(ui, vbox, STRING("label"), STRING("Hello, World!"));
		xsui_button_new(ui, vbox, STRING("button"), STRING("Click me!"), &on_button_pressed, NULL, NULL);
		xsui_frame_t *button2 = xsui_button_new(ui, vbox, STRING("button2"), STRING("this is a long button label"), NULL, NULL, NULL);
		xsui_frame_set_color(button2, XSUI_COLOR_SECONDARY);
		xsui_frame_t *hbox = xsui_box_new(ui, NULL, STRING("hbox"), XSUI_BOX_HORIZONTAL | XSUI_BOX_NO_BORDER);
			xsui_button_new(ui, hbox, STRING("foo_button"), STRING("Foo"), NULL, NULL, NULL);
			xsui_button_new(ui, hbox, STRING("bar_button"), STRING("Bar"), NULL, NULL, NULL);
			xsui_button_new(ui, hbox, STRING("baz_button"), STRING("Baz"), NULL, NULL, NULL);
		// end
	// end
	while(true) {
		// ... event handling code ...
		xsui_state_render_root(ui);
	}
	// ... cleanup code ...
}

void draw(xsui_state_t *ui, xstd_allocator_t *ally, void *data) {
	xsui_begin_tree(ui);
		xsui_box(ui, 0);
		// note: "frames" (what xsui calls "components" or "widgets") still exist; but the 
		// UI tree itself is managed by XSUI but not the user. So to set the property of a
		// frame, we need to actually grab the frame with `xsui_last_frame()`.
		// this is different from libraries like Dear ImGUI which do not expose their UI 
		// tree at all.
		xsui_frame_set_desired_pos(xsui_last_frame(ui), 50, 50);
		xsui_frame_set_desired_size(xsui_last_frame(ui), 500, 0);
			xsui_label(ui, STRING("Hello, World!"));
			if(xsui_button(ui, STRING("Click me!")))
				printf("I have been clicked!");
			xsui_button(ui, STRING("this is a long button label"));
			xsui_frame_set_color(xsui_last_frame(ui), XSUI_COLOR_SECONDARY);
			xsui_box(ui, XSUI_BOX_HORIZONTAL | XSUI_BOX_NO_BORDER);
			xsui_box_margin(xsui_last_frame(ui), 0);
				xsui_button(ui, STRING("Foo"));
				xsui_button(ui, STRING("Bar"));
				xsui_button(ui, STRING("Baz"));
			xsui_end_container(ui);
		xsui_end_container(ui);
	xsui_end_tree(ui);
}