116 lines
4 KiB
C++
116 lines
4 KiB
C++
/* Copyright (c) 2003-2005 Various contributors
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#ifndef MT32EMU_TABLES_H
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#define MT32EMU_TABLES_H
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namespace MT32Emu {
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// Mathematical constants
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const double DOUBLE_PI = 3.1415926535897932384626433832795;
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const double DOUBLE_LN = 2.3025850929940456840179914546844;
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const float FLOAT_PI = 3.1415926535897932384626433832795f;
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const float FLOAT_LN = 2.3025850929940456840179914546844f;
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// Filter settings
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const int FILTERGRAN = 512;
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// Amplitude of waveform generator
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// FIXME: This value is the amplitude possible whilst avoiding
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// overdriven values immediately after filtering when playing
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// back SQ3MT.MID. Needs to be checked.
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const int WGAMP = 12382;
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const int MIDDLEC = 60;
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const int MIDDLEA = 69; // By this I mean "A above middle C"
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// FIXME:KG: may only need to do 12 to 108
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// 12..108 is the range allowed by note on commands, but the key can be modified by pitch keyfollow
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// and adjustment for timbre pitch, so the results can be outside that range.
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// Should we move it (by octave) into the 12..108 range, or keep it in 0..127 range,
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// or something else altogether?
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const int LOWEST_NOTE = 12;
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const int HIGHEST_NOTE = 127;
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const int NUM_NOTES = HIGHEST_NOTE - LOWEST_NOTE + 1; // Number of slots for note LUT
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class Synth;
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struct NoteLookup {
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Bit32u div2;
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Bit32u *wavTable;
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Bit32s sawTable[101];
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int filtTable[2][201];
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int nfiltTable[101][101];
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Bit16s *waveforms[3];
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Bit32u waveformSize[3];
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};
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struct KeyLookup {
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Bit32s envTimeMult[5]; // For envelope time adjustment for key pressed
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Bit32s envDepthMult[5];
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};
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class Tables {
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float initializedSampleRate;
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float initializedMasterTune;
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void initMT32ConstantTables(Synth *synth);
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static Bit16s clampWF(Synth *synth, const char *n, float ampVal, double input);
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static File *initWave(Synth *synth, NoteLookup *noteLookup, float ampsize, float div2, File *file);
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bool initNotes(Synth *synth, PCMWaveEntry *pcmWaves, float rate, float tuning);
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void initEnvelopes(float sampleRate);
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void initFiltCoeff(float samplerate);
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public:
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// Constant LUTs
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Bit32s tvfKeyfollowMult[217];
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Bit32s tvfVelfollowMult[128][101];
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Bit32s tvfBiasMult[15][128];
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Bit32u tvaVelfollowMult[128][101];
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Bit32s tvaBiasMult[13][128];
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Bit16s noiseBuf[MAX_SAMPLE_OUTPUT];
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Bit16s sintable[65536];
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Bit32s pitchEnvVal[16][101];
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Bit32s envTimeVelfollowMult[5][128];
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Bit32s pwVelfollowAdd[15][128];
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float resonanceFactor[31];
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Bit32u lfoShift[101][101];
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Bit32s pwFactor[101];
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Bit32s volumeMult[101];
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// LUTs varying with sample rate
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Bit32u envTime[101];
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Bit32u envDeltaMaxTime[101];
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Bit32u envDecayTime[101];
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Bit32u lfoPeriod[101];
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float filtCoeff[FILTERGRAN][31][8];
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// Various LUTs for each note and key
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NoteLookup noteLookups[NUM_NOTES];
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KeyLookup keyLookups[97];
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Tables();
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bool init(Synth *synth, PCMWaveEntry *pcmWaves, float sampleRate, float masterTune);
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File *initNote(Synth *synth, NoteLookup *noteLookup, float note, float rate, float tuning, PCMWaveEntry *pcmWaves, File *file);
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void freeNotes();
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};
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}
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#endif
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