gistfile1.c

#include <SDL.h>

int PollEvents()
{
    SDL_Event event;
	while (SDL_PollEvent(&event))
	{
		switch (event.type)
		{
			case SDL_WINDOWEVENT:
				if (event.window.event == SDL_WINDOWEVENT_ENTER)
					printf("Mouse focus gained\n");
				else if (event.window.event == SDL_WINDOWEVENT_LEAVE)
					printf("Mouse focus lost\n");
				break;
			case SDL_MOUSEMOTION:
				printf("relative mm: %d, %d\n", event.motion.xrel, event.motion.yrel);
				break;
			case SDL_QUIT:
				return 1;
			default:
				break;
		}
	}

	return 0;
}

int main(int argc, char *argv[])
{
	SDL_Init(SDL_INIT_VIDEO | SDL_INIT_TIMER);

	SDL_Window *win = SDL_CreateWindow("Test", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 800, 600, 0);
	SDL_SetRelativeMouseMode(SDL_TRUE);

	while (1)
	{
		if (PollEvents())
			break;

		SDL_Delay(10);
	}

	SDL_DestroyWindow(win);

	SDL_Quit();
	
	return 0;
}