diff options
Diffstat (limited to 'src/tables.c')
| -rw-r--r-- | src/tables.c | 42 |
1 files changed, 23 insertions, 19 deletions
diff --git a/src/tables.c b/src/tables.c index ffafeb7e..543fda8c 100644 --- a/src/tables.c +++ b/src/tables.c @@ -38,33 +38,37 @@ // //----------------------------------------------------------------------------- - - - - #include "tables.h" +// to get a global angle from cartesian coordinates, the coordinates are +// flipped until they are in the first octant of the coordinate system, then +// the y (<=x) is scaled and divided by x to get a tangent (slope) value +// which is looked up in the tantoangle[] table. The +1 size is to handle +// the case when x==y without additional checking. - - -int -SlopeDiv -( unsigned num, - unsigned den) +int SlopeDiv(unsigned int num, unsigned int den) { - unsigned ans; + unsigned ans; if (den < 512) - return SLOPERANGE; + { + return SLOPERANGE; + } + else + { + ans = (num << 3) / (den >> 8); - ans = (num<<3)/(den>>8); - - return ans <= SLOPERANGE ? ans : SLOPERANGE; + if (ans <= SLOPERANGE) + { + return ans; + } + else + { + return SLOPERANGE; + } + } } - - - const int finetangent[4096] = { -170910304,-56965752,-34178904,-24413316,-18988036,-15535599,-13145455,-11392683, @@ -1866,7 +1870,7 @@ const int finesine[10240] = 65534,65535,65535,65535,65535,65535,65535,65535 }; - +const fixed_t *finecosine = &finesine[FINEANGLES/4]; const angle_t tantoangle[2049] = { |