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fix poppy interpolation audio quality bug

This commit is contained in:
zeromus 2011-08-23 22:27:49 +00:00
parent f2dc074b40
commit 35b32046e9
1 changed files with 4 additions and 5 deletions
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9
desmume/src/SPU.cpp
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@ -793,22 +793,21 @@ void SPU_WriteLong(u32 addr, u32 val)
//////////////////////////////////////////////////////////////////////////////
template<SPUInterpolationMode INTERPOLATE_MODE> static FORCEINLINE s32 Interpolate(s32 a, s32 b, double _ratio)
template<SPUInterpolationMode INTERPOLATE_MODE> static FORCEINLINE s32 Interpolate(s32 a, s32 b, double ratio)
{
float ratio = (float)_ratio;
if(INTERPOLATE_MODE == SPUInterpolation_Cosine)
{
//why did we change it away from the lookup table? somebody should research that
ratio = ratio - (int)ratio;
ratio = ratio - sputrunc(ratio);
double ratio2 = ((1.0 - cos(ratio * M_PI)) * 0.5);
//double ratio2 = (1.0f - cos_lut[((int)(ratio*256.0))&0xFF]) / 2.0f;
return (s32)(((1-ratio2)*a) + (ratio2*b));
return s32floor((float)(((1-ratio2)*a) + (ratio2*b)));
}
else
{
//linear interpolation
ratio = ratio - sputrunc(ratio);
return s32floor((1-ratio)*a + ratio*b);
return s32floor((float)((1-ratio)*a + ratio*b));
}
}