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simplified formulas for calculating envelope array resulting in about 3x performance with traditional FPU code; loops now can be vectorized by GCC 4.4

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git-svn-id: https://lmms.svn.sf.net/svnroot/lmms/branches/lmms/stable-0.4@2003 0778d3d1-df1d-0410-868b-ea421aaaa00d
This commit is contained in:
Tobias Doerffel
2009-02-05 13:17:21 +00:00
parent aa575bca83
commit 1ffe1c0733
1 changed files with 14 additions and 8 deletions
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22
src/core/envelope_and_lfo_parameters.cpp
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@@ -245,10 +245,11 @@ inline void envelopeAndLFOParameters::fillLFOLevel( float * _buf,
}
fpp_t offset = 0;
const float lafI = 1.0f / m_lfoAttackFrames;
for( ; offset < _frames && _frame < m_lfoAttackFrames; ++offset,
++_frame )
{
*_buf++ = m_lfoShapeData[offset] * _frame / m_lfoAttackFrames;
*_buf++ = m_lfoShapeData[offset] * _frame * lafI;
}
for( ; offset < _frames; ++offset )
{
@@ -411,39 +412,44 @@ void envelopeAndLFOParameters::updateSampleVars( void )
m_pahdEnv = new sample_t[m_pahdFrames];
m_rEnv = new sample_t[m_rFrames];
const float aa = m_amountAdd;
for( f_cnt_t i = 0; i < predelay_frames; ++i )
{
m_pahdEnv[i] = m_amountAdd;
m_pahdEnv[i] = aa;
}
f_cnt_t add = predelay_frames;
const float afI = ( 1.0f / attack_frames ) * m_amount;
for( f_cnt_t i = 0; i < attack_frames; ++i )
{
m_pahdEnv[add + i] = ( (float)i / attack_frames ) *
m_amount + m_amountAdd;
m_pahdEnv[add+i] = i * afI + aa;
}
add += attack_frames;
const float amsum = m_amount + m_amountAdd;
for( f_cnt_t i = 0; i < hold_frames; ++i )
{
m_pahdEnv[add + i] = m_amount + m_amountAdd;
m_pahdEnv[add + i] = amsum;
}
add += hold_frames;
const float dfI = (1.0 / decay_frames)*(m_sustainLevel-1)*m_amount;
for( f_cnt_t i = 0; i < decay_frames; ++i )
{
/*
m_pahdEnv[add + i] = ( m_sustainLevel + ( 1.0f -
(float)i / decay_frames ) *
( 1.0f - m_sustainLevel ) ) *
m_amount + m_amountAdd;
*/
m_pahdEnv[add + i] = amsum + i*dfI;
}
const float rfI = ( 1.0f / m_rFrames ) * m_amount;
for( f_cnt_t i = 0; i < m_rFrames; ++i )
{
m_rEnv[i] = ( (float)( m_rFrames - i ) / m_rFrames
// * m_sustainLevel
) * m_amount;
m_rEnv[i] = (float)( m_rFrames - i ) * rfI;
}
// save this calculation in real-time-part