(svn r2595) -Codechange: Introduced "IsSteepTileh" to find whether a tile is steep
(i.e. spans two height levels) and use it throughout the code.
-Codechange: Add CanBuildDepotByTileh to find if a tile is suitable to
build a depot on it. Wraps some bitmagic which seems quite unreadable at
first glance
#ifndef DEBUG_H
#define DEBUG_H
#ifdef NO_DEBUG_MESSAGES
#define DEBUG(name, level)
#else
#define DEBUG(name, level) if (level == 0 || _debug_ ## name ## _level >= level) debug
extern int _debug_ai_level;
extern int _debug_grf_level;
extern int _debug_map_level;
extern int _debug_misc_level;
extern int _debug_ms_level;
extern int _debug_net_level;
extern int _debug_spritecache_level;
extern int _debug_oldloader_level;
extern int _debug_pbs_level;
#ifdef GPMI
extern int _debug_gpmi_level;
#endif /* GPMI */
extern int _debug_npf_level;
#endif
void CDECL debug(const char *s, ...);
void SetDebugString(const char *s);
const char *GetDebugString(void);
#ifdef GPMI
void gpmi_debug_openttd(int level, char *s);
#endif /* GPMI */
#endif