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Added a width snippet that uses the pan LUT

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This commit is contained in:
Paul Fd 2020-02-09 23:38:50 +01:00
parent 992d20782f
commit 9783e393da
1 changed files with 31 additions and 9 deletions
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40
src/sfizz/SIMDHelpers.h
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@ -742,21 +742,30 @@ namespace _internals {
return pan;
}();
template <class T>
inline T panLookup(T pan)
{
// reduce range, round to nearest
int index = static_cast<int>(T{0.5} + pan * (panSize - 1));
return panData[index];
}
template <class T>
inline void snippetPan(const T*& pan, T*& left, T*& right)
{
T p = ((*pan++) + T{1.0}) * T{0.5};
p = clamp<T>(p, 0, 1);
*left++ *= panLookup(p);
*right++ *= panLookup(1 - p);
}
auto lookUp = [](T pan) -> T
{
// reduce range, round to nearest
int index = static_cast<int>(T{0.5} + pan * (panSize - 1));
return panData[index];
};
*left++ *= lookUp(p);
*right++ *= lookUp(1 - p);
template <class T>
inline void snippetWidth(const T*& pan, T*& mid, T*& side)
{
T p = std::abs(*pan);
p = clamp<T>(p, 0, 1);
*mid++ *= panLookup(p);
*side++ *= *pan++ > 0 ? panLookup(1 - p) : -panLookup(1 - p);
}
}
@ -787,6 +796,19 @@ void pan(absl::Span<const T> panEnvelope, absl::Span<T> leftBuffer, absl::Span<T
template <>
void pan<float, true>(absl::Span<const float> panEnvelope, absl::Span<float> leftBuffer, absl::Span<float> rightBuffer) noexcept;
template <class T, bool SIMD = SIMDConfig::pan>
void width(absl::Span<const T> widthEnvelope, absl::Span<T> midBuffer, absl::Span<T> sideBuffer) noexcept
{
ASSERT(midBuffer.size() >= widthEnvelope.size());
ASSERT(sideBuffer.size() >= widthEnvelope.size());
auto* width = widthEnvelope.begin();
auto* mid = midBuffer.begin();
auto* side = sideBuffer.begin();
auto* sentinel = width + min(widthEnvelope.size(), midBuffer.size(), sideBuffer.size());
while (width < sentinel)
_internals::snippetWidth(width, mid, side);
}
/**
* @brief Computes the mean of a span
*