Arena::Arena(ArrayPtr<byte> scratch)
: nextChunkSize(kj::max(sizeof(ChunkHeader), scratch.size())) {
if (scratch.size() > sizeof(ChunkHeader)) {
ChunkHeader* chunk = reinterpret_cast<ChunkHeader*>(scratch.begin());
chunk->end = scratch.end();
chunk->pos = reinterpret_cast<byte*>(chunk + 1);
chunk->next = nullptr; // Never actually observed.
// Don't place the chunk in the chunk list because it's not ours to delete. Just make it the
// current chunk so that we'll allocate from it until it is empty.
currentChunk = chunk;
}
}
/* ------------------------------------------------------- */
void SphereVolume::computeFromData(const Ptr<VertexData>& vdata)
{
m_radius = 0.0f;
m_center = Vector3(0.0f, 0.0f, 0.0f);
float curDistance = 0.0f;
ArrayPtr<GeometryVertex> vertices = vdata->getGeometryData();
for (int i = 0; i < vertices.size(); i++)
{
m_center += vertices[i].position;
}
m_center /= vertices.size();
for (int i = 0; i < vertices.size(); i++)
{
curDistance = (vertices[i].position-m_center).squaredLength();
if (curDistance > m_radius)
{
m_radius = curDistance;
}
}
m_radius = Math<float>::Sqrt(m_radius);
}
