direction.h

   1 #ifndef DIRECTION_H
   2 #define DIRECTION_H
   3
   4 enum __attribute__ ((__packed__)) direction {
   5         DIR_N = 0,
   6         DIR_NW,
   7         DIR_W,
   8         DIR_SW,
   9         DIR_S,
  10         DIR_SO,
  11         DIR_O,
  12         DIR_NO,
  13         DIR_MAX,
  14         DIR_INVALID = DIR_MAX
  15 };
  16
  17 static inline const char* dir_name(enum direction dir) {
  18         #define DIRNAME(a) [ a ] = #a
  19         static const char* dir_names[] = {
  20                 DIRNAME(DIR_N),
  21                 DIRNAME(DIR_NW),
  22                 DIRNAME(DIR_W),
  23                 DIRNAME(DIR_SW),
  24                 DIRNAME(DIR_S),
  25                 DIRNAME(DIR_SO),
  26                 DIRNAME(DIR_O),
  27                 DIRNAME(DIR_NO),
  28         };
  29         #undef DIRNAME
  30         return dir_names[dir];
  31 }
  32
  33 enum __attribute__ ((__packed__)) direction_bits {
  34         DIRB_INVALID = 0,
  35         DIRB_N = 1 << 0,
  36         DIRB_S = 1 << 1,
  37         DIRB_O = 1 << 2,
  38         DIRB_W = 1 << 3,
  39         DIRB_NW = DIRB_N | DIRB_W,
  40         DIRB_SW = DIRB_S | DIRB_W,
  41         DIRB_SO = DIRB_S | DIRB_O,
  42         DIRB_NO = DIRB_N | DIRB_O,
  43 };
  44
  45 extern const enum direction_bits direction_directionbit_lut[];
  46 extern const enum direction directionbit_direction_lut[];
  47 #define direction_to_directionbit(dir) direction_directionbit_lut[dir]
  48 #define directionbit_to_direction(db) direction_directionbit_lut[db]
  49
  50 enum __attribute__ ((__packed__)) direction16 {
  51         DIR16_N = 0,
  52         DIR16_NNW,
  53         DIR16_NW,
  54         DIR16_WNW,
  55         DIR16_W,
  56         DIR16_WSW,
  57         DIR16_SW,
  58         DIR16_SSW,
  59         DIR16_S,
  60         DIR16_SSO,
  61         DIR16_SO,
  62         DIR16_OSO,
  63         DIR16_O,
  64         DIR16_ONO,
  65         DIR16_NO,
  66         DIR16_NNO,
  67         DIR16_MAX,
  68         DIR16_INVALID = DIR16_MAX
  69 };
  70
  71 //RcB: DEP "direction.c"
  72
  73 #endif