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n/f/fbm: accumulate frequency directly on point

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avoids (minimal) extra multiplications.
This commit is contained in:
Danny Robson 2015-06-02 16:17:44 +10:00
parent 6278902e3e
commit 4f7a3d790f
1 changed files with 6 additions and 5 deletions
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11
noise/fractal/fbm.ipp
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@ -60,14 +60,15 @@ namespace util { namespace noise { namespace fractal {
fbm<T,B>::operator() (util::point<2,T> p) const fbm<T,B>::operator() (util::point<2,T> p) const
{ {
T total = 0; T total = 0;
T f = this->m_frequency; T scale = this->m_invAH;
T a = this->m_invAH;
p *= this->m_frequency;
for (size_t i = 0; i < this->m_octaves; ++i) { for (size_t i = 0; i < this->m_octaves; ++i) {
total += this->m_basis (p * f) * a; total += this->m_basis (p) * scale;
f *= this->m_lacunarity; p *= this->m_lacunarity;
a *= this->m_invGH; scale *= this->m_invGH;
} }
return total; return total;