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Use a function reference for a template parameter

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This commit is contained in:
Chris Robinson 2019-03-28 10:00:35 -07:00
parent dfb81ff42d
commit fe7918465e
1 changed files with 27 additions and 25 deletions
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52
Alc/mixer/mixer_c.cpp
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@ -40,6 +40,33 @@ static inline ALfloat do_bsinc(const InterpState &istate, const ALfloat *RESTRIC
return r;
}
using SamplerT = ALfloat(const InterpState&, const ALfloat*RESTRICT, const ALsizei);
template<SamplerT &Sampler>
static const ALfloat *DoResample(const InterpState *state, const ALfloat *RESTRICT src,
ALsizei frac, ALint increment, ALfloat *RESTRICT dst,
ALsizei numsamples)
{
ASSUME(numsamples > 0);
ASSUME(increment > 0);
ASSUME(frac >= 0);
const InterpState istate{*state};
auto proc_sample = [&src,&frac,istate,increment]() -> ALfloat
{
const ALfloat ret{Sampler(istate, src, frac)};
frac += increment;
src += frac>>FRACTIONBITS;
frac &= FRACTIONMASK;
return ret;
};
std::generate_n<ALfloat*RESTRICT>(dst, numsamples, proc_sample);
return dst;
}
template<>
const ALfloat *Resample_<CopyTag,CTag>(const InterpState* UNUSED(state),
const ALfloat *RESTRICT src, ALsizei UNUSED(frac), ALint UNUSED(increment),
@ -55,31 +82,6 @@ const ALfloat *Resample_<CopyTag,CTag>(const InterpState* UNUSED(state),
return dst;
}
template<ALfloat Sampler(const InterpState&, const ALfloat*RESTRICT, const ALsizei) noexcept>
static const ALfloat *DoResample(const InterpState *state, const ALfloat *RESTRICT src,
ALsizei frac, ALint increment, ALfloat *RESTRICT dst,
ALsizei numsamples)
{
ASSUME(numsamples > 0);
ASSUME(increment > 0);
ASSUME(frac >= 0);
const InterpState istate{*state};
std::generate_n<ALfloat*RESTRICT>(dst, numsamples,
[&src,&frac,istate,increment]() noexcept -> ALfloat
{
ALfloat ret{Sampler(istate, src, frac)};
frac += increment;
src += frac>>FRACTIONBITS;
frac &= FRACTIONMASK;
return ret;
}
);
return dst;
}
template<>
const ALfloat *Resample_<PointTag,CTag>(const InterpState *state, const ALfloat *RESTRICT src,
ALsizei frac, ALint increment, ALfloat *RESTRICT dst, ALsizei dstlen)