58 lines
2.2 KiB
C++
58 lines
2.2 KiB
C++
/*
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Peacock-8 VA polysynth
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Copyright 2025 Gordon JC Pearce <gordonjcp@gjcp.net>
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Permission to use, copy, modify, and/or distribute this software for any
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purpose with or without fee is hereby granted, provided that the above
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copyright notice and this permission notice appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
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OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include "module.hpp"
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#include "tables.hpp"
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Module::Module() {
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}
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void Module::run(Voice* voice) {
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// run updates for module board
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// FIXME break these out to the patch setter
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a = attackTable[patchRam.env_a]; // attack time coeff looked up in table
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d = decayTable[patchRam.env_d]; // decay time coeff looked up in table
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r = decayTable[patchRam.env_r]; // release time coeff looked up in table
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s = patchRam.env_s << 7; // scale 0x00-0x7f to 0x0000-0x3f80
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// work out the "master" cutoff
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vcfCutoff = patchRam.vcfFreq / 127.0f;
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vcfCutoff += lfo * (patchRam.vcfLfo/127.0f);
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// also needs pitch bend amount for the base level
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for (uint32_t i = 0; i < NUM_VOICES; i++) {
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switch (voice[i].envPhase) {
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case 0: // release phase FIXME use an enum I guess
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voice[i].env = (voice[i].env * d) >> 16; // "RC" decay to zero
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break;
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case 1: // attack phase
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voice[i].env += a; // linear attack to 0x3fff
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break;
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case 2:
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voice[i].env = (((voice[i].env - s) * d) >>16 ) + s;
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break;
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}
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if (voice[i].env > 0x3fff) {
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voice[i].env = 0x3fff;
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voice[i].envPhase = 2; // flip to decay
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}
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// per voice we need to calculate the key follow amount and envelope amount
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}
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}
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