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- optimized TVector3::XY() to return a writable reference.

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This commit is contained in:
Christoph Oelckers 2022-08-18 19:14:50 +02:00
parent 48cbdeb697
commit be2f61bce2
1 changed files with 9 additions and 2 deletions
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11
source/common/utility/vectors.h
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@ -308,6 +308,8 @@ template<class vec_t>
struct TVector3 struct TVector3
{ {
typedef TVector2<vec_t> Vector2; typedef TVector2<vec_t> Vector2;
// this does not compile - should be true on all relevant hardware.
//static_assert(myoffsetof(TVector3, X) == myoffsetof(Vector2, X) && myoffsetof(TVector3, Y) == myoffsetof(Vector2, Y), "TVector2 and TVector3 are not aligned");
vec_t X, Y, Z; vec_t X, Y, Z;
@ -492,9 +494,14 @@ struct TVector3
} }
// returns the XY fields as a 2D-vector. // returns the XY fields as a 2D-vector.
Vector2 XY() const const Vector2& XY() const
{ {
return{ X, Y }; return *reinterpret_cast<const Vector2*>(this);
}
Vector2& XY()
{
return *reinterpret_cast<Vector2*>(this);
} }
// Add a 3D vector and a 2D vector. // Add a 3D vector and a 2D vector.