Files
bounce/include/bounce/quickhull/qh_hull.inl
2016-12-21 19:15:43 -02:00

190 lines
2.8 KiB
C++

// qhHull.h
template<class T>
inline void qhList<T>::PushFront(T* link)
{
link->prev = NULL;
link->next = head;
if (head)
{
head->prev = link;
}
head = link;
++count;
}
template<class T>
inline T* qhList<T>::Remove(T* link)
{
T* next = link->next;
if (link->prev)
{
link->prev->next = link->next;
}
if (link->next)
{
link->next->prev = link->prev;
}
if (link == head)
{
head = link->next;
}
link->prev = NULL;
link->next = NULL;
--count;
return next;
}
inline u32 qhFace::VertexCount() const
{
u32 count = 0;
qhHalfEdge* e = edge;
do
{
++count;
e = e->next;
} while (e != edge);
return count;
}
inline u32 qhFace::EdgeCount() const
{
u32 count = 0;
qhHalfEdge* e = edge;
do
{
++count;
e = e->next;
} while (e != edge);
return count;
}
inline qhHalfEdge* qhFace::FindTwin(const qhVertex* tail, const qhVertex* head) const
{
qhHalfEdge* e = edge;
do
{
qhVertex* tail2 = e->tail;
qhVertex* head2 = e->next->tail;
if (tail2 == tail && head2 == head)
{
return e;
}
e = e->next;
} while (e != edge);
return NULL;
}
inline b3Vec3 b3Newell(const b3Vec3& a, const b3Vec3& b)
{
return b3Vec3((a.y - b.y) * (a.z + b.z), (a.z - b.z) * (a.x + b.x), (a.x - b.x) * (a.y + b.y));
}
inline void qhFace::ComputeCenterAndPlane()
{
b3Vec3 c;
c.SetZero();
b3Vec3 n;
n.SetZero();
u32 count = 0;
qhHalfEdge* e = edge;
do
{
b3Vec3 v1 = e->tail->position;
b3Vec3 v2 = e->next->tail->position;
n += b3Newell(v1, v2);
c += v1;
++count;
e = e->next;
} while (e != edge);
B3_ASSERT(count > 0);
c /= float32(count);
n.Normalize();
plane.normal = n;
plane.offset = b3Dot(n, c);
center = c;
}
inline qhHalfEdge* qhHull::FindTwin(const qhVertex* tail, const qhVertex* head) const
{
qhFace* face = m_faceList.head;
while (face)
{
qhHalfEdge* e = face->FindTwin(tail, head);
if (e)
{
return e;
}
face = face->next;
}
return NULL;
}
inline u32 qhGetMemorySize(u32 V)
{
u32 E = 3 * V - 6;
u32 HE = 2 * E;
u32 F = 2 * V - 4;
// V - E + F = 2
HE *= 2;
F *= 2;
u32 size = 0;
size += V * sizeof(qhVertex);
size += HE * sizeof(qhHalfEdge);
size += F * sizeof(qhFace);
return size;
}
inline qhVertex* qhHull::AllocateVertex()
{
qhVertex* v = m_freeVertices;
m_freeVertices = v->freeNext;
return v;
}
inline void qhHull::FreeVertex(qhVertex* v)
{
v->freeNext = m_freeVertices;
m_freeVertices = v;
}
inline qhHalfEdge* qhHull::AllocateEdge()
{
qhHalfEdge* e = m_freeEdges;
m_freeEdges = e->freeNext;
return e;
}
inline void qhHull::FreeEdge(qhHalfEdge* e)
{
e->freeNext = m_freeEdges;
m_freeEdges = e;
}
inline qhFace* qhHull::AllocateFace()
{
qhFace* f = m_freeFaces;
m_freeFaces = f->freeNext;
return f;
}
inline void qhHull::FreeFace(qhFace* f)
{
f->state = qhFace::e_deleted;
f->freeNext = m_freeFaces;
m_freeFaces = f;
}