sdl_mouse_test.c

#include <stdio.h>
#include <SDL2/SDL.h>
#include <assert.h>
#ifdef __EMSCRIPTEN__
#include <emscripten.h>
#endif

int result = 1;
int done = 0;

void one() {
  SDL_Event event;
  while (SDL_PollEvent(&event)) {
    switch(event.type) {
      case SDL_MOUSEMOTION: {
        SDL_MouseMotionEvent *m = (SDL_MouseMotionEvent*)&event;
        assert(m->state == 0);
        int x, y;
        SDL_GetMouseState(&x, &y);
        printf("motion: %d = %d, %d = %d, %d,%d\n", m->x, x, m->y, y, m->xrel, m->yrel);
        //assert(x == m->x && y == m->y);
        if(x != m->x && y != m->y) {printf("fail\n");}
        result += 2 * (m->x + m->y + m->xrel + m->yrel);
        break;
      }
      case SDL_MOUSEBUTTONDOWN: {
        SDL_MouseButtonEvent *m = (SDL_MouseButtonEvent*)&event;
        printf("button down: %d,%d  %d,%d\n", m->button, m->state, m->x, m->y);
        result += 3 * (m->button + m->state + m->x + m->y);
        break;
      }
      case SDL_MOUSEBUTTONUP: {
        SDL_MouseButtonEvent *m = (SDL_MouseButtonEvent*)&event;
        printf("button up: %d,%d  %d,%d\n", m->button, m->state, m->x, m->y);
        result += 5 * (m->button + m->state + m->x + m->y);
        // Remove another click we want to ignore
        assert(SDL_PeepEvents(&event, 1, SDL_GETEVENT, SDL_MOUSEBUTTONDOWN, SDL_MOUSEBUTTONDOWN) == 1);
        assert(SDL_PeepEvents(&event, 1, SDL_GETEVENT, SDL_MOUSEBUTTONUP, SDL_MOUSEBUTTONUP) == 1);
        break;
      case SDL_QUIT:
        done = 1;
        break;
      }
    }
  }
}

int main() {
  SDL_Init(SDL_INIT_VIDEO);
  SDL_Window *window;
  SDL_Renderer *renderer;

  SDL_CreateWindowAndRenderer(600, 450, 0, &window, &renderer);

  SDL_SetRenderDrawColor(renderer, 0xFF, 0x00, 0x00, 0xFF );
  SDL_Rect rect = { 0, 0, 600, 450 };
  SDL_RenderFillRect(renderer, &rect);

#ifdef __EMSCRIPTEN__
  emscripten_set_main_loop(one, 1000, 1);
#else
  while(!done){
    one();
  }
#endif
  return 0;
}