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add stride

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This commit is contained in:
Glenn Maynard
2006-12-09 22:43:44 +00:00
parent 4e73095fce
commit fa5a6102f4
2 changed files with 11 additions and 7 deletions
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stepmania/src/RageSoundMixBuffer.cpp
+10 -6
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@@ -53,23 +53,27 @@ void RageSoundMixBuffer::Extend( unsigned iSamples )
}
}
void RageSoundMixBuffer::write( const int16_t *pBuf, unsigned iSize )
void RageSoundMixBuffer::write( const int16_t *pBuf, unsigned iSize, int iSourceStride, int iDestStride )
{
Extend( iSize );
/* iSize = 3, iDestStride = 2 uses 4 frames. Don't allocate the stride of the
* last sample. */
Extend( iSize * iDestStride - (iDestStride-1) );
/* Scale volume and add. */
int32_t *pDestBuf = m_pMixbuf+m_iOffset;
#ifdef USE_VEC
if( g_bVector )
if( g_bVector && iSourceStride == 1 && iDestStride == 1 )
{
Vector::FastSoundWrite( pDestBuf, pBuf, iSize, m_iVolumeFactor );
return;
}
#endif
for( unsigned pos = 0; pos < iSize; ++pos )
while( iSize )
{
*pDestBuf += pBuf[pos] * m_iVolumeFactor;
++pDestBuf;
*pDestBuf += *pBuf * m_iVolumeFactor;
pBuf += iSourceStride;
pDestBuf += iDestStride;
--iSize;
}
}