#define CONDERROR(a) if ((a)) {fprintf(stderr,"Error: %s\n",SDL_GetError());exit(1);}
#define NULLERROR(a) CONDERROR((a)==NULL)
#define CONDERROR(a) if ((a)) {fprintf(stderr,"Error: %s\n",SDL_GetError());exit(1);}
#define NULLERROR(a) CONDERROR((a)==NULL)