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tables.h

/* Copyright (c) 2003-2004 Various contributors
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 */

#ifndef MT32EMU_TABLES_H
#define MT32EMU_TABLES_H

namespace MT32Emu {

// Mathematical constants
const double DOUBLE_PI = 3.1415926535897932384626433832795;
const double DOUBLE_LN = 2.3025850929940456840179914546844;
const float FLOAT_PI = 3.1415926535897932384626433832795f;
const float FLOAT_LN = 2.3025850929940456840179914546844f;

// Filter settings
const int FILTERGRAN = 512;

const int MIDDLEC = 60;
const int MIDDLEA = 69; // By this I mean "A above middle C"

//FIXME:KG: may only need to do 12 to 108
//12..108 is the range allowed by note on commands, but the key can be modified by pitch keyfollow
//and adjustment for timbre pitch, so the results can be outside that range. Do move it (by octave) into
// the 12..108 range, or keep it in 0..127 range, or something else altogether?
const int LOWEST_NOTE = 12;
const int HIGHEST_NOTE = 127;
const int NUM_NOTES = HIGHEST_NOTE - LOWEST_NOTE + 1; // Number of slots for note LUT

// Amplitude of waveform generator
const int WGAMP = 7168; // 8192?

class Synth;

extern Bit16s smallnoise[MAX_SAMPLE_OUTPUT];

// Some optimization stuff
extern Bit32s keytable[217];
extern Bit16s sintable[65536];
extern Bit32u lfotable[101];
extern Bit32s penvtable[16][101];
extern Bit32s filveltable[128][101];
extern Bit32s veltkeytable[5][128];
extern Bit32s pulsetable[101];
extern Bit32s ampbiastable[13][128];
extern Bit32s fbiastable[15][128];
extern float filtcoeff[FILTERGRAN][31][8];
extern Bit32s finetable[201];
extern Bit32u lfoptable[101][101];
extern Bit32s ampveltable[128][64];
extern Bit32s pwveltable[15][128];
extern Bit32s envtimetable[101];
extern Bit32s decaytimetable[101];
extern Bit32s lasttimetable[101];
extern Bit32s voltable[128];
extern float ResonInv[31];

struct NoteLookup {
      Bit32u div;
      Bit32u wavTable[128];
      Bit32s sawTable[101];
      Bit32s fildepTable[5];
      Bit32s timekeyTable[5];
      int filtTable[2][201];
      int nfiltTable[101][101];
      Bit16s *waveforms[3];
      Bit32u waveformSize[3];
};

extern NoteLookup noteLookups[NUM_NOTES];

class TableInitialiser {
      static void initMT32ConstantTables(Synth *synth);
      static File *initWave(Synth *synth, NoteLookup *noteLookup, float ampsize, float div, File *file);
      static bool initNotes(Synth *synth, PCMWaveEntry pcmWaves[128], float rate, float tuning);
public:
      static bool initMT32Tables(Synth *synth, PCMWaveEntry pcmWaves[128], float sampleRate, float masterTune);
      static File *initNote(Synth *synth, NoteLookup *noteLookup, float note, float rate, float tuning, PCMWaveEntry pcmWaves[128], File *file);
      static void freeNotes();
};

}

#endif

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