ValueBuffer * AutomatableModel::valueBuffer()
{
// if we've already calculated the valuebuffer this period, return the cached buffer
if( m_lastUpdatedPeriod == s_periodCounter )
{
return m_hasSampleExactData
? &m_valueBuffer
: NULL;
}
QMutexLocker m( &m_valueBufferMutex );
if( m_lastUpdatedPeriod == s_periodCounter )
{
return m_hasSampleExactData
? &m_valueBuffer
: NULL;
}
float val = m_value; // make sure our m_value doesn't change midway
ValueBuffer * vb;
if( m_controllerConnection && m_controllerConnection->getController()->isSampleExact() )
{
vb = m_controllerConnection->valueBuffer();
if( vb )
{
float * values = vb->values();
float * nvalues = m_valueBuffer.values();
switch( m_scaleType )
{
case Linear:
for( int i = 0; i < m_valueBuffer.length(); i++ )
{
nvalues[i] = minValue<float>() + ( range() * values[i] );
}
break;
case Logarithmic:
for( int i = 0; i < m_valueBuffer.length(); i++ )
{
nvalues[i] = logToLinearScale( values[i] );
}
break;
default:
qFatal("AutomatableModel::valueBuffer() "
"lacks implementation for a scale type");
break;
}
m_lastUpdatedPeriod = s_periodCounter;
m_hasSampleExactData = true;
return &m_valueBuffer;
}
}
AutomatableModel* lm = NULL;
if( m_hasLinkedModels )
{
lm = m_linkedModels.first();
}
if( lm && lm->controllerConnection() && lm->controllerConnection()->getController()->isSampleExact() )
{
vb = lm->valueBuffer();
float * values = vb->values();
float * nvalues = m_valueBuffer.values();
for( int i = 0; i < vb->length(); i++ )
{
nvalues[i] = fittedValue( values[i] );
}
m_lastUpdatedPeriod = s_periodCounter;
m_hasSampleExactData = true;
return &m_valueBuffer;
}
if( m_oldValue != val )
{
m_valueBuffer.interpolate( m_oldValue, val );
m_oldValue = val;
m_lastUpdatedPeriod = s_periodCounter;
m_hasSampleExactData = true;
return &m_valueBuffer;
}
// if we have no sample-exact source for a ValueBuffer, return NULL to signify that no data is available at the moment
// in which case the recipient knows to use the static value() instead
m_lastUpdatedPeriod = s_periodCounter;
m_hasSampleExactData = false;
return NULL;
}
