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Wavetable.cpp
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Wavetable.cpp
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/*
* Surge XT - a free and open source hybrid synthesizer,
* built by Surge Synth Team
*
* Learn more at https://surge-synthesizer.github.io/
*
* Copyright 2018-2024, various authors, as described in the GitHub
* transaction log.
*
* Surge XT is released under the GNU General Public Licence v3
* or later (GPL-3.0-or-later). The license is found in the "LICENSE"
* file in the root of this repository, or at
* https://www.gnu.org/licenses/gpl-3.0.en.html
*
* Surge was a commercial product from 2004-2018, copyright and ownership
* held by Claes Johanson at Vember Audio during that period.
* Claes made Surge open source in September 2018.
*
* All source for Surge XT is available at
* https://github.com/surge-synthesizer/surge
*/
#include "Wavetable.h"
#include <assert.h>
#include "DSPUtils.h"
#include <vembertech/basic_dsp.h>
#include "SurgeStorage.h"
#include "sst/basic-blocks/mechanics/endian-ops.h"
namespace mech = sst::basic_blocks::mechanics;
#if WINDOWS
#include <intrin.h>
#endif
using namespace std;
const float hrfilter[63] = {
-9.637663112e-008f, -2.216513622e-006f, -1.200509132e-006f, 1.79627641e-005f,
1.773084477e-005f, -5.898886593e-005f, -8.980041457e-005f, 0.0001233910152f,
0.0002964516752f, -0.0001573183545f, -0.0007465034723f, 1.204636671e-018f,
0.001525280299f, 0.0006605535164f, -0.002588451374f, -0.002282966627f,
0.003618633142f, 0.005384810269f, -0.003885820275f, -0.01036664937f,
0.002154163085f, 0.0172905419f, 0.003383208299f, -0.02569983155f,
-0.01536878385f, 0.03457865119f, 0.0387589559f, -0.04251147807f,
-0.0895993337f, 0.04802387953f, 0.3125254214f, 0.4499996006f,
0.3125254214f, 0.04802387953f, -0.0895993337f, -0.04251147807f,
0.0387589559f, 0.03457865119f, -0.01536878385f, -0.02569983155f,
0.003383208299f, 0.0172905419f, 0.002154163085f, -0.01036664937f,
-0.003885820275f, 0.005384810269f, 0.003618633142f, -0.002282966627f,
-0.002588451374f, 0.0006605535164f, 0.001525280299f, 1.204636671e-018f,
-0.0007465034723f, -0.0001573183545f, 0.0002964516752f, 0.0001233910152f,
-8.980041457e-005f, -5.898886593e-005f, 1.773084477e-005f, 1.79627641e-005f,
-1.200509132e-006f, -2.216513622e-006f, -9.637663112e-008};
const int HRFilterI16[64] = {
1, 33, -8, -48, 31, 72, -74, -92, 143, 95, -240, -66, 364,
-14, -505, 168, 642, -416, -748, 779, 782, -1279, -687, 1951, 375, -2874,
331, 4293, -1957, -7315, 7773, 31275, 31275, 7773, -7315, -1957, 4293, 331, -2874,
375, 1951, -687, -1279, 782, 779, -748, -416, 642, 168, -505, -14, 364,
-66, -240, 95, 143, -92, -74, 72, 31, -48, -8, 33, 1};
int min_F32_tables = 3;
#if MAC || LINUX
bool _BitScanReverse(unsigned int *result, unsigned int bits)
{
*result = __builtin_ctz(bits);
return true;
}
#endif
//! Calculate the worst-case scenario of the needed samples for a specific wavetable and see if it
//! fits
size_t RequiredWTSize(int TableSize, int TableCount)
{
int Size = 0;
TableCount += 3; // for sample padding. Should match the "3" in the AppendSilence block below.
while (TableSize > 0)
{
Size += TableCount * (TableSize + FIRoffsetI16 + FIRipolI16_N);
TableSize = TableSize >> 1;
}
return Size;
}
int GetWTIndex(int WaveIdx, int WaveSize, int NumWaves, int MipMap, int Padding = 0)
{
int Index = WaveIdx * ((WaveSize >> MipMap) + Padding);
int Offset = NumWaves * WaveSize;
for (int i = 0; i < MipMap; i++)
{
Index += Offset >> i;
Index += Padding * NumWaves;
}
return Index;
}
Wavetable::Wavetable()
{
dataSizes = 35000;
TableF32Data = (float *)malloc(dataSizes * sizeof(float));
TableI16Data = (short *)malloc(dataSizes * sizeof(short));
memset(TableF32Data, 0, dataSizes * sizeof(float));
memset(TableI16Data, 0, dataSizes * sizeof(short));
memset(TableF32WeakPointers, 0, sizeof(TableF32WeakPointers));
memset(TableI16WeakPointers, 0, sizeof(TableI16WeakPointers));
current_id = -1;
queue_id = -1;
everBuilt = false;
refresh_display = true; // I have never been drawn so assume I need refresh if asked
}
Wavetable::~Wavetable()
{
free(TableF32Data);
free(TableI16Data);
}
void Wavetable::allocPointers(size_t newSize)
{
free(TableF32Data);
free(TableI16Data);
dataSizes = newSize;
TableF32Data = (float *)malloc(dataSizes * sizeof(float));
TableI16Data = (short *)malloc(dataSizes * sizeof(short));
memset(TableF32Data, 0, dataSizes * sizeof(float));
memset(TableI16Data, 0, dataSizes * sizeof(short));
}
void Wavetable::Copy(Wavetable *wt)
{
size = wt->size;
size_po2 = wt->size_po2;
flags = wt->flags;
dt = wt->dt;
n_tables = wt->n_tables;
current_id = -1;
queue_id = -1;
everBuilt = wt->everBuilt;
if (dataSizes < wt->dataSizes)
{
allocPointers(wt->dataSizes);
}
memcpy(TableF32Data, wt->TableF32Data, dataSizes * sizeof(float));
memcpy(TableI16Data, wt->TableI16Data, dataSizes * sizeof(short));
for (int i = 0; i < max_mipmap_levels; i++)
{
for (int j = 0; j < max_subtables; j++)
{
if (wt->TableF32WeakPointers[i][j])
{
size_t Offset = wt->TableF32WeakPointers[i][j] - wt->TableF32Data;
TableF32WeakPointers[i][j] = TableF32Data + Offset;
}
else
TableF32WeakPointers[i][j] = NULL;
if (wt->TableI16WeakPointers[i][j])
{
size_t Offset = wt->TableI16WeakPointers[i][j] - wt->TableI16Data;
TableI16WeakPointers[i][j] = TableI16Data + Offset;
}
else
TableI16WeakPointers[i][j] = NULL;
}
}
current_id = wt->current_id;
}
bool Wavetable::BuildWT(void *wdata, wt_header &wh, bool AppendSilence)
{
assert(wdata);
flags = mech::endian_read_int16LE(wh.flags);
n_tables = mech::endian_read_int16LE(wh.n_tables);
size = mech::endian_read_int32LE(wh.n_samples);
size_t req_size = RequiredWTSize(size, n_tables);
if (req_size > dataSizes)
{
allocPointers(req_size);
}
int wdata_tables = n_tables;
if (AppendSilence)
{
n_tables += 3; // this "3" should match the "3" in RequiredWTSize
}
#if WINDOWS
unsigned long MSBpos;
_BitScanReverse(&MSBpos, size);
#else
unsigned int MSBpos;
_BitScanReverse(&MSBpos, size);
#endif
size_po2 = MSBpos;
dt = 1.0f / size;
for (int i = 0; i < max_mipmap_levels; i++)
{
for (int j = 0; j < max_subtables; j++)
{
// TODO WARNING: Crashes here with patchbyte!
/*free(wt->TableF32WeakPointers[i][j]);
free(wt->TableI16WeakPointers[i][j]);
wt->TableF32WeakPointers[i][j] = 0;
wt->TableI16WeakPointers[i][j] = 0;*/
}
}
for (int j = 0; j < this->n_tables; j++)
{
TableF32WeakPointers[0][j] = TableF32Data + GetWTIndex(j, size, n_tables, 0);
// + padding for a non-wrapping interpolator
TableI16WeakPointers[0][j] = TableI16Data + GetWTIndex(j, size, n_tables, 0, FIRipolI16_N);
}
for (int j = this->n_tables; j < min_F32_tables; j++)
{
unsigned int s = this->size;
int l = 0;
while (s && (l < max_mipmap_levels))
{
TableF32WeakPointers[l][j] = TableF32Data + GetWTIndex(j, size, n_tables, l);
memset(TableF32WeakPointers[l][j], 0, s * sizeof(float));
s = s >> 1;
l++;
}
}
if (this->flags & wtf_int16)
{
for (int j = 0; j < wdata_tables; j++)
{
mech::endian_copyblock16LE(&this->TableI16WeakPointers[0][j][FIRoffsetI16],
&((short *)wdata)[this->size * j], this->size);
if (this->flags & wtf_int16_is_16)
{
i16toi15_block(&this->TableI16WeakPointers[0][j][FIRoffsetI16],
&this->TableI16WeakPointers[0][j][FIRoffsetI16], this->size);
}
i152float_block(&this->TableI16WeakPointers[0][j][FIRoffsetI16],
this->TableF32WeakPointers[0][j], this->size);
}
}
else
{
for (int j = 0; j < wdata_tables; j++)
{
mech::endian_copyblock32LE((int32_t *)this->TableF32WeakPointers[0][j],
&((int32_t *)wdata)[this->size * j], this->size);
float2i15_block(this->TableF32WeakPointers[0][j],
&this->TableI16WeakPointers[0][j][FIRoffsetI16], this->size);
}
}
// clear any appended tables (not read, but included in table for post-silence)
for (int j = wdata_tables; j < this->n_tables; j++)
{
memset(this->TableF32WeakPointers[0][j], 0, this->size * sizeof(float));
memset(this->TableI16WeakPointers[0][j], 0, (this->size + FIRoffsetI16) * sizeof(short));
}
for (int j = 0; j < wdata_tables; j++)
{
memcpy(&this->TableI16WeakPointers[0][j][this->size + FIRoffsetI16],
&this->TableI16WeakPointers[0][j][FIRoffsetI16], FIRoffsetI16 * sizeof(short));
memcpy(&this->TableI16WeakPointers[0][j][0], &this->TableI16WeakPointers[0][j][this->size],
FIRoffsetI16 * sizeof(short));
}
MipMapWT();
everBuilt = true;
return true;
}
void Wavetable::MipMapWT()
{
int levels = 1;
while (((1 << levels) < size) & (levels < max_mipmap_levels))
levels++;
int ns = this->n_tables;
const int filter_size = 63;
const int filter_id_of = (filter_size - 1) >> 1;
for (int l = 1; l < levels; l++)
{
int psize = size >> (l - 1);
int lsize = size >> l;
for (int s = 0; s < ns; s++)
{
this->TableF32WeakPointers[l][s] = TableF32Data + GetWTIndex(s, size, n_tables, l);
this->TableI16WeakPointers[l][s] =
TableI16Data + GetWTIndex(s, size, n_tables, l, FIRipolI16_N);
if (this->flags & wtf_is_sample)
{
for (int i = 0; i < lsize; i++)
{
this->TableF32WeakPointers[l][s][i] = 0;
for (int a = 0; a < filter_size; a++)
{
int srcindex = (i << 1) + a - filter_id_of;
int srctable = max(0, s + (srcindex / psize));
srcindex = srcindex & (psize - 1);
if (srctable < ns)
this->TableF32WeakPointers[l][s][i] +=
hrfilter[a] * this->TableF32WeakPointers[l - 1][srctable][srcindex];
}
this->TableI16WeakPointers[l][s][i + FIRoffsetI16] =
0; // not supported in int16 atm
}
}
else
{
for (int i = 0; i < lsize; i++)
{
this->TableF32WeakPointers[l][s][i] = 0;
for (int a = 0; a < filter_size; a++)
{
this->TableF32WeakPointers[l][s][i] +=
hrfilter[a] * this->TableF32WeakPointers[l - 1][s][(
((i << 1) + a - filter_id_of) & (psize - 1))];
}
int ival = 0;
for (int a = 0; a < filter_size; a++)
{
ival += HRFilterI16[a] *
this->TableI16WeakPointers[l - 1][s]
[(((i << 1) + a - 31) & (psize - 1)) +
FIRoffsetI16];
}
this->TableI16WeakPointers[l][s][i + FIRoffsetI16] = ival >> 16;
}
}
// float2i16_block(this->TableF32WeakPointers[l][s],this->TableI16WeakPointers[l][s],lsize);
auto toCopy = std::min(FIRoffsetI16, lsize);
memcpy(&this->TableI16WeakPointers[l][s][lsize + FIRoffsetI16],
&this->TableI16WeakPointers[l][s][FIRoffsetI16], toCopy * sizeof(short));
memcpy(&this->TableI16WeakPointers[l][s][0], &this->TableI16WeakPointers[l][s][lsize],
toCopy * sizeof(short));
}
// fwrite(this->TableI16WeakPointers[l][0],lsize*sizeof(short),1,F);
}
// fclose(F);
// TODO I16 mipmaps end up out of phase
// The click/knot/bug probably results from the fact that there is no padding in the beginning,
// so it becomes out of phase at mipmap switch - makes sense because as they were off by a whole
// sample at the mipmap switch, which cannot be explained by the half rate filter
}