TakeV/dxx-rebirth
1
0
Fork 0
Code Issues Pull requests Packages Projects Releases Wiki Activity

Skip find_plane_line_intersection numerator when den==0

Browse source
This commit is contained in:
Kp 2015-02-05 03:03:51 +00:00
parent 4108c9f3c6
commit b070c2a7b3
1 changed files with 6 additions and 10 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

16
similar/main/fvi.cpp
View file

@ -56,18 +56,14 @@ using std::min;
__attribute_warn_unused_result
static int find_plane_line_intersection(vms_vector &new_pnt,const vms_vector &plane_pnt,const vms_vector &plane_norm,const vms_vector &p0,const vms_vector &p1,fix rad)
{
fix num,den;
auto d = vm_vec_sub(p1,p0);
const auto w = vm_vec_sub(p0,plane_pnt);
num = vm_vec_dot(plane_norm,w);
den = -vm_vec_dot(plane_norm,d);
num -= rad; //move point out by rad
if (den == 0) // moving parallel to wall, so can't hit it
const fix den = -vm_vec_dot(plane_norm,d);
if (unlikely(!den)) // moving parallel to wall, so can't hit it
return 0;
const auto w = vm_vec_sub(p0,plane_pnt);
fix num = vm_vec_dot(plane_norm,w) - rad; //move point out by rad
//check for various bad values
if (den > 0 && (-num>>15) >= den) //will overflow (large negative)
num = (f1_0-f0_5)*den;