minetest/irrlicht
1
0
Fork 0
mirror of https://github.com/minetest/irrlicht.git synced 2024-11-20 01:00:24 +01:00
Code Issues Projects Releases Wiki Activity

vector3d scalar operator/ and operator/= no longer multiply by the inverse but use the expected division.

Browse Source 
That was a bad case of premature optimization.
Multiplication is indeed faster, but when working with floats this can introduce some rather unexpected inaccuracies.
Like x/x suddenly no longer being 1.0 (something guaranteed by division).
If someone really needs this back, then please add some new function which makes it clear we don't just have a typical division here.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@6298 dfc29bdd-3216-0410-991c-e03cc46cb475
This commit is contained in:
cutealien 2022-02-03 14:47:41 +00:00 committed by sfan5
parent 8c0ee7d9ab
commit 7fb36849c7
2 changed files with 4 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
changes.txt
View File

@ -9,6 +9,8 @@ Changes in ogl-es (not yet released - will be merged with trunk at some point)
--------------------------
Changes in 1.9 (not yet released)
- vector3d scalar operator/ and operator/= no longer multiply by the inverse but use the expected division.
Costs some speed, but fixes floating point troubles caused by this optimization (like x/x no longer being 1.0).
- Add equals and set_data functions to core::array for easier working with blocks of data.
- SIrrlichtCreationParameters::IgnoreInput set to false works again on X11.
Thanks @ Victor Gaydov for report + patch + very good test cases! (bug #401)

4
include/vector3d.h
View File

@ -50,8 +50,8 @@ namespace core
vector3d<T> operator/(const vector3d<T>& other) const { return vector3d<T>(X / other.X, Y / other.Y, Z / other.Z); }
vector3d<T>& operator/=(const vector3d<T>& other) { X/=other.X; Y/=other.Y; Z/=other.Z; return *this; }
vector3d<T> operator/(const T v) const { T i=(T)1.0/v; return vector3d<T>(X * i, Y * i, Z * i); }
vector3d<T>& operator/=(const T v) { T i=(T)1.0/v; X*=i; Y*=i; Z*=i; return *this; }
vector3d<T> operator/(const T v) const { return vector3d<T>(X/v, Y/v, Z/v); }
vector3d<T>& operator/=(const T v) { X/=v; Y/=v; Z/=v; return *this; }
T& operator [](u32 index)
{