#ifdef, #ifndef, #else, #endif

#ifdef name

#ifndef name

#else

#endif

Defined names can be used to to skip certain script lines dependent on previous #defines. All script lines between #ifdef and #endif are skipped if name was not defined. Likewise, all lines between #ifndef and #endif are skipped if name was #defined. The #else statement reverses the line skipping or non-skipping.

Remarks

#defines and #ifdef lines are ignored within engine objects definitions, such as PANEL*, MATERIAL* etc. If you want to have different engine object parameters dependent on #define statements, define several separate objects and select them through #ifdef.

Example:

#define LOW_RES
... 
#ifndef LOW_RES
  video_mode = 8; // 1024x768
#else
  video_mode = 6; // 640x480 
#endif

See also:

#define ► latest version online