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WIP: WaveSabreCore: simplify cos-table computation #35

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WIP: WaveSabreCore: simplify cos-table computation #35

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27 changes: 7 additions & 20 deletions WaveSabreCore/src/Helpers.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -100,24 +100,6 @@ static __declspec(naked) float __vectorcall fpuPowF(float x, float y)
}
}

static __declspec(naked) double __vectorcall fpuCos(double x)
{
__asm
{
sub esp, 8

movsd mmword ptr [esp], xmm0
fld qword ptr [esp]
fcos
fstp qword ptr [esp]
movsd xmm0, mmword ptr [esp]

add esp, 8

ret
}
}

namespace WaveSabreCore
{
double Helpers::CurrentSampleRate = 44100.0;
Expand All @@ -132,10 +114,15 @@ namespace WaveSabreCore
{
RandomSeed = 1;

const double delta = (M_PI * 2) / fastCosTabSize;
const double sd = sin(delta), cd = cos(delta);
double x = 0, y = 1;
for (int i = 0; i < fastCosTabSize + 1; i++)
{
double phase = double(i) * ((M_PI * 2) / fastCosTabSize);
fastCosTab[i] = fpuCos(phase);
fastCosTab[i] = y;
double tx = x * cd - y * sd;
y = x * sd + y * cd;
x = tx;
}
}

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