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BandLimitedWave: provide wavetables as pre-generated "bin" files, these will be installed under datadir/wavetables

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The runtime-generation is still there as a fallback, and the file generation code is left in as commented-out, because
it might be needed in the future
This commit is contained in:
Vesa
2014-04-25 19:17:41 +03:00
parent f4a8df7c67
commit 9b9e175925
8 changed files with 228 additions and 99 deletions
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259
src/core/BandLimitedWave.cpp
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@@ -28,6 +28,7 @@
WaveMipMap BandLimitedWave::s_waveforms[4] = { };
bool BandLimitedWave::s_wavesGenerated = false;
QString BandLimitedWave::s_wavetableDir = "";
void BandLimitedWave::generateWaves()
{
@@ -36,117 +37,207 @@ void BandLimitedWave::generateWaves()
int i;
// set wavetable directory
s_wavetableDir = configManager::inst()->dataDir() + "wavetables/";
// set wavetable files
QFile saw_file( s_wavetableDir + "saw.bin" );
QFile sqr_file( s_wavetableDir + "sqr.bin" );
QFile tri_file( s_wavetableDir + "tri.bin" );
QFile moog_file( s_wavetableDir + "moog.bin" );
// saw wave - BLSaw
for( i = 0; i <= MAXTBL; i++ )
// check for file and use it if exists
if( saw_file.exists() )
{
const int len = TLENS[i];
//const double om = 1.0 / len;
double max = 0.0;
for( int ph = 0; ph < len; ph++ )
saw_file.open( QIODevice::ReadOnly );
QDataStream in( &saw_file );
in >> s_waveforms[ BandLimitedWave::BLSaw ];
saw_file.close();
}
else
{
for( i = 0; i <= MAXTBL; i++ )
{
int harm = 1;
double s = 0.0f;
double hlen;
do
const int len = TLENS[i];
//const double om = 1.0 / len;
double max = 0.0;
for( int ph = 0; ph < len; ph++ )
{
hlen = static_cast<double>( len ) / static_cast<double>( harm );
const double amp = -1.0 / static_cast<double>( harm );
//const double a2 = cos( om * harm * F_2PI );
s += amp * /*a2 **/sin( static_cast<double>( ph * harm ) / static_cast<double>( len ) * F_2PI );
harm++;
} while( hlen > 2.0 );
s_waveforms[ BandLimitedWave::BLSaw ].setSampleAt( i, ph, s );
max = qMax( max, qAbs( s ) );
}
// normalize
for( int ph = 0; ph < len; ph++ )
{
sample_t s = s_waveforms[ BandLimitedWave::BLSaw ].sampleAt( i, ph ) / max;
s_waveforms[ BandLimitedWave::BLSaw ].setSampleAt( i, ph, s );
int harm = 1;
double s = 0.0f;
double hlen;
do
{
hlen = static_cast<double>( len ) / static_cast<double>( harm );
const double amp = -1.0 / static_cast<double>( harm );
//const double a2 = cos( om * harm * F_2PI );
s += amp * /*a2 **/sin( static_cast<double>( ph * harm ) / static_cast<double>( len ) * F_2PI );
harm++;
} while( hlen > 2.0 );
s_waveforms[ BandLimitedWave::BLSaw ].setSampleAt( i, ph, s );
max = qMax( max, qAbs( s ) );
}
// normalize
for( int ph = 0; ph < len; ph++ )
{
sample_t s = s_waveforms[ BandLimitedWave::BLSaw ].sampleAt( i, ph ) / max;
s_waveforms[ BandLimitedWave::BLSaw ].setSampleAt( i, ph, s );
}
}
}
// square wave - BLSquare
for( i = 0; i <= MAXTBL; i++ )
// check for file and use it if exists
if( sqr_file.exists() )
{
const int len = TLENS[i];
//const double om = 1.0 / len;
double max = 0.0;
for( int ph = 0; ph < len; ph++ )
sqr_file.open( QIODevice::ReadOnly );
QDataStream in( &sqr_file );
in >> s_waveforms[ BandLimitedWave::BLSquare ];
sqr_file.close();
}
else
{
for( i = 0; i <= MAXTBL; i++ )
{
int harm = 1;
double s = 0.0f;
double hlen;
do
const int len = TLENS[i];
//const double om = 1.0 / len;
double max = 0.0;
for( int ph = 0; ph < len; ph++ )
{
hlen = static_cast<double>( len ) / static_cast<double>( harm );
const double amp = 1.0 / static_cast<double>( harm );
//const double a2 = cos( om * harm * F_2PI );
s += amp * /*a2 **/ sin( static_cast<double>( ph * harm ) / static_cast<double>( len ) * F_2PI );
harm += 2;
} while( hlen > 2.0 );
s_waveforms[ BandLimitedWave::BLSquare ].setSampleAt( i, ph, s );
max = qMax( max, qAbs( s ) );
}
// normalize
for( int ph = 0; ph < len; ph++ )
{
sample_t s = s_waveforms[ BandLimitedWave::BLSquare ].sampleAt( i, ph ) / max;
s_waveforms[ BandLimitedWave::BLSquare ].setSampleAt( i, ph, s );
int harm = 1;
double s = 0.0f;
double hlen;
do
{
hlen = static_cast<double>( len ) / static_cast<double>( harm );
const double amp = 1.0 / static_cast<double>( harm );
//const double a2 = cos( om * harm * F_2PI );
s += amp * /*a2 **/ sin( static_cast<double>( ph * harm ) / static_cast<double>( len ) * F_2PI );
harm += 2;
} while( hlen > 2.0 );
s_waveforms[ BandLimitedWave::BLSquare ].setSampleAt( i, ph, s );
max = qMax( max, qAbs( s ) );
}
// normalize
for( int ph = 0; ph < len; ph++ )
{
sample_t s = s_waveforms[ BandLimitedWave::BLSquare ].sampleAt( i, ph ) / max;
s_waveforms[ BandLimitedWave::BLSquare ].setSampleAt( i, ph, s );
}
}
}
// triangle wave - BLTriangle
for( i = 0; i <= MAXTBL; i++ )
if( tri_file.exists() )
{
const int len = TLENS[i];
//const double om = 1.0 / len;
double max = 0.0;
for( int ph = 0; ph < len; ph++ )
tri_file.open( QIODevice::ReadOnly );
QDataStream in( &tri_file );
in >> s_waveforms[ BandLimitedWave::BLTriangle ];
tri_file.close();
}
else
{
for( i = 0; i <= MAXTBL; i++ )
{
int harm = 1;
double s = 0.0f;
double hlen;
do
const int len = TLENS[i];
//const double om = 1.0 / len;
double max = 0.0;
for( int ph = 0; ph < len; ph++ )
{
hlen = static_cast<double>( len ) / static_cast<double>( harm );
const double amp = 1.0 / static_cast<double>( harm * harm );
//const double a2 = cos( om * harm * F_2PI );
s += amp * /*a2 **/ sin( ( static_cast<double>( ph * harm ) / static_cast<double>( len ) +
( ( harm + 1 ) % 4 == 0 ? 0.5 : 0.0 ) ) * F_2PI );
harm += 2;
} while( hlen > 2.0 );
s_waveforms[ BandLimitedWave::BLTriangle ].setSampleAt( i, ph, s );
max = qMax( max, qAbs( s ) );
}
// normalize
for( int ph = 0; ph < len; ph++ )
{
sample_t s = s_waveforms[ BandLimitedWave::BLTriangle ].sampleAt( i, ph ) / max;
s_waveforms[ BandLimitedWave::BLTriangle ].setSampleAt( i, ph, s );
int harm = 1;
double s = 0.0f;
double hlen;
do
{
hlen = static_cast<double>( len ) / static_cast<double>( harm );
const double amp = 1.0 / static_cast<double>( harm * harm );
//const double a2 = cos( om * harm * F_2PI );
s += amp * /*a2 **/ sin( ( static_cast<double>( ph * harm ) / static_cast<double>( len ) +
( ( harm + 1 ) % 4 == 0 ? 0.5 : 0.0 ) ) * F_2PI );
harm += 2;
} while( hlen > 2.0 );
s_waveforms[ BandLimitedWave::BLTriangle ].setSampleAt( i, ph, s );
max = qMax( max, qAbs( s ) );
}
// normalize
for( int ph = 0; ph < len; ph++ )
{
sample_t s = s_waveforms[ BandLimitedWave::BLTriangle ].sampleAt( i, ph ) / max;
s_waveforms[ BandLimitedWave::BLTriangle ].setSampleAt( i, ph, s );
}
}
}
// moog saw wave - BLMoog
// basically, just add in triangle + 270-phase saw
for( i = 0; i <= MAXTBL; i++ )
if( moog_file.exists() )
{
const int len = TLENS[i];
for( int ph = 0; ph < len; ph++ )
moog_file.open( QIODevice::ReadOnly );
QDataStream in( &moog_file );
in >> s_waveforms[ BandLimitedWave::BLMoog ];
moog_file.close();
}
else
{
for( i = 0; i <= MAXTBL; i++ )
{
const int sawph = ( ph + static_cast<int>( len * 0.75 ) ) % len;
const sample_t saw = s_waveforms[ BandLimitedWave::BLSaw ].sampleAt( i, sawph );
const sample_t tri = s_waveforms[ BandLimitedWave::BLTriangle ].sampleAt( i, ph );
s_waveforms[ BandLimitedWave::BLMoog ].setSampleAt( i, ph, ( saw + tri ) * 0.5f );
const int len = TLENS[i];
for( int ph = 0; ph < len; ph++ )
{
const int sawph = ( ph + static_cast<int>( len * 0.75 ) ) % len;
const sample_t saw = s_waveforms[ BandLimitedWave::BLSaw ].sampleAt( i, sawph );
const sample_t tri = s_waveforms[ BandLimitedWave::BLTriangle ].sampleAt( i, ph );
s_waveforms[ BandLimitedWave::BLMoog ].setSampleAt( i, ph, ( saw + tri ) * 0.5f );
}
}
}
// set the generated flag so we don't load/generate them again needlessly
s_wavesGenerated = true;
// generate files, serialize mipmaps as QDataStreams and save them on disk
//
// normally these are now provided with LMMS as pre-generated so we don't have to do this,
// but I'm leaving the code here in case it's needed in the future
// (maybe we add more waveforms or change the generation code or mipmap format, etc.)
/*
// if you want to generate the files, you need to set the filenames and paths here -
// can't use the usual wavetable directory here as it can require permissions on
// some systems...
QFile sawfile( "path-to-wavetables/saw.bin" );
QFile sqrfile( "path-to-wavetables/sqr.bin" );
QFile trifile( "path-to-wavetables/tri.bin" );
QFile moogfile( "path-to-wavetables/moog.bin" );
sawfile.open( QIODevice::WriteOnly );
QDataStream sawout( &sawfile );
sawout << s_waveforms[ BandLimitedWave::BLSaw ];
sawfile.close();
sqrfile.open( QIODevice::WriteOnly );
QDataStream sqrout( &sqrfile );
sqrout << s_waveforms[ BandLimitedWave::BLSquare ];
sqrfile.close();
trifile.open( QIODevice::WriteOnly );
QDataStream triout( &trifile );
triout << s_waveforms[ BandLimitedWave::BLTriangle ];
trifile.close();
moogfile.open( QIODevice::WriteOnly );
QDataStream moogout( &moogfile );
moogout << s_waveforms[ BandLimitedWave::BLMoog ];
moogfile.close();
*/
}