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/*
SuperCollider real time audio synthesis system
Copyright (c) 2002 James McCartney. All rights reserved.
http://www.audiosynth.com
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "Samp.h"
#include "SC_Constants.h"
#include <stdlib.h>
#include <stdexcept>
float32 gSine[kSineSize+1];
float32 gPMSine[kSineSize+1];
float32 gInvSine[kSineSize+1];
float32 gSineWavetable[2*kSineSize];
void SignalAsWavetable(float32* signal, float32* wavetable, long inSize)
{
float32 val1, val2;
float32* in = signal;
float32* out = wavetable - 1;
for (int i=0; i<inSize - 1; ++i) {
val1 = in[i];
val2 = in[i+1];
*++out = 2.f * val1 - val2;
*++out = val2 - val1;
}
val1 = in[inSize-1];
val2 = in[0];
*++out = 2.f * val1 - val2;
*++out = val2 - val1;
}
void WavetableAsSignal(float32* wavetable, float32* signal, long inSize)
{
float32* in = wavetable - 1;
float32* out = signal - 1;
for (int i=0; i<inSize; ++i) {
float32 a = *++in;
float32 b = *++in;
*++out = a + b;
}
}
class SynthLibInit
{
public:
SynthLibInit();
void FillTables();
};
SynthLibInit gSynthLibInit;
SynthLibInit::SynthLibInit()
{
FillTables();
}
void SynthLibInit::FillTables()
{
double sineIndexToPhase = twopi / kSineSize;
double pmf = (1L << 29) / twopi;
for (int i=0; i <= kSineSize; ++i) {
double phase = i * sineIndexToPhase;
float32 d = sin(phase);
gSine[i] = d;
gInvSine[i] = 1. / d;
gPMSine[i] = d * pmf;
}
SignalAsWavetable(gSine, gSineWavetable, kSineSize);
gInvSine[0] = gInvSine[kSineSize/2] = gInvSine[kSineSize] = kBadValue;
int sz = kSineSize;
int sz2 = sz>>1;
for (int i=1; i<=8; ++i) {
gInvSine[i] = gInvSine[sz-i] = kBadValue;
gInvSine[sz2-i] = gInvSine[sz2+i] = kBadValue;
}
//SignalAsWavetable(gInvSine, gInvSineWavetable, kSineSize);
}
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