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331 lines
12 KiB
331 lines
12 KiB
/*
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* Copyright 2016-2017 Pascal Gauthier.
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* Copyright 2012 Google Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <math.h>
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#include <stdlib.h>
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#include "synth.h"
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#include "freqlut.h"
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#include "exp2.h"
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#include "controllers.h"
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#include "dx7note.h"
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const int FEEDBACK_BITDEPTH = 8;
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int32_t midinote_to_logfreq(int midinote) {
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const int base = 50857777; // (1 << 24) * (log(440) / log(2) - 69/12)
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const int step = (1 << 24) / 12;
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return base + step * midinote;
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}
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const int32_t coarsemul[] = {
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-16777216, 0, 16777216, 26591258, 33554432, 38955489, 43368474, 47099600,
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50331648, 53182516, 55732705, 58039632, 60145690, 62083076, 63876816,
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65546747, 67108864, 68576247, 69959732, 71268397, 72509921, 73690858,
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74816848, 75892776, 76922906, 77910978, 78860292, 79773775, 80654032,
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81503396, 82323963, 83117622
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};
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int32_t osc_freq(int midinote, int mode, int coarse, int fine, int detune) {
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// TODO: pitch randomization
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int32_t logfreq;
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if (mode == 0) {
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logfreq = midinote_to_logfreq(midinote);
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// could use more precision, closer enough for now. those numbers comes from my DX7
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double detuneRatio = 0.0209 * exp(-0.396 * (((float)logfreq)/(1<<24))) / 7;
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logfreq += detuneRatio * logfreq * (detune - 7);
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logfreq += coarsemul[coarse & 31];
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if (fine) {
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// (1 << 24) / log(2)
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logfreq += (int32_t)floor(24204406.323123 * log(1 + 0.01 * fine) + 0.5);
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}
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// // This was measured at 7.213Hz per count at 9600Hz, but the exact
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// // value is somewhat dependent on midinote. Close enough for now.
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// //logfreq += 12606 * (detune -7);
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} else {
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// ((1 << 24) * log(10) / log(2) * .01) << 3
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logfreq = (4458616 * ((coarse & 3) * 100 + fine)) >> 3;
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logfreq += detune > 7 ? 13457 * (detune - 7) : 0;
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}
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return logfreq;
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}
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const uint8_t velocity_data[64] = {
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0, 70, 86, 97, 106, 114, 121, 126, 132, 138, 142, 148, 152, 156, 160, 163,
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166, 170, 173, 174, 178, 181, 184, 186, 189, 190, 194, 196, 198, 200, 202,
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205, 206, 209, 211, 214, 216, 218, 220, 222, 224, 225, 227, 229, 230, 232,
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233, 235, 237, 238, 240, 241, 242, 243, 244, 246, 246, 248, 249, 250, 251,
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252, 253, 254
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};
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// See "velocity" section of notes. Returns velocity delta in microsteps.
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int ScaleVelocity(int velocity, int sensitivity) {
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int clamped_vel = max(0, min(127, velocity));
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int vel_value = velocity_data[clamped_vel >> 1] - 239;
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int scaled_vel = ((sensitivity * vel_value + 7) >> 3) << 4;
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return scaled_vel;
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}
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int ScaleRate(int midinote, int sensitivity) {
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int x = min(31, max(0, midinote / 3 - 7));
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int qratedelta = (sensitivity * x) >> 3;
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#ifdef SUPER_PRECISE
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int rem = x & 7;
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if (sensitivity == 3 && rem == 3) {
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qratedelta -= 1;
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} else if (sensitivity == 7 && rem > 0 && rem < 4) {
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qratedelta += 1;
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}
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#endif
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return qratedelta;
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}
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const uint8_t exp_scale_data[] = {
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0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 14, 16, 19, 23, 27, 33, 39, 47, 56, 66,
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80, 94, 110, 126, 142, 158, 174, 190, 206, 222, 238, 250
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};
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int ScaleCurve(int group, int depth, int curve) {
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int scale;
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if (curve == 0 || curve == 3) {
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// linear
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scale = (group * depth * 329) >> 12;
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} else {
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// exponential
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int n_scale_data = sizeof(exp_scale_data);
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int raw_exp = exp_scale_data[min(group, n_scale_data - 1)];
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scale = (raw_exp * depth * 329) >> 15;
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}
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if (curve < 2) {
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scale = -scale;
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}
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return scale;
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}
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int ScaleLevel(int midinote, int break_pt, int left_depth, int right_depth,
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int left_curve, int right_curve) {
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int offset = midinote - break_pt - 17;
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if (offset >= 0) {
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return ScaleCurve((offset+1) / 3, right_depth, right_curve);
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} else {
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return ScaleCurve(-(offset-1) / 3, left_depth, left_curve);
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}
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}
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static const uint8_t pitchmodsenstab[] = {
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0, 10, 20, 33, 55, 92, 153, 255
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};
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// 0, 66, 109, 255
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static const uint32_t ampmodsenstab[] = {
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0, 4342338, 7171437, 16777216
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};
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Dx7Note::Dx7Note() {
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for(int op=0;op<6;op++) {
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params_[op].phase = 0;
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params_[op].gain_out = 0;
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}
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}
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void Dx7Note::init(const uint8_t patch[156], int midinote, int velocity) {
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int rates[4];
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int levels[4];
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for (int op = 0; op < 6; op++) {
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int off = op * 21;
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for (int i = 0; i < 4; i++) {
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rates[i] = patch[off + i];
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levels[i] = patch[off + 4 + i];
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}
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int outlevel = patch[off + 16];
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outlevel = Env::scaleoutlevel(outlevel);
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int level_scaling = ScaleLevel(midinote, patch[off + 8], patch[off + 9],
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patch[off + 10], patch[off + 11], patch[off + 12]);
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outlevel += level_scaling;
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outlevel = min(127, outlevel);
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outlevel = outlevel << 5;
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outlevel += ScaleVelocity(velocity, patch[off + 15]);
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outlevel = max(0, outlevel);
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int rate_scaling = ScaleRate(midinote, patch[off + 13]);
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env_[op].init(rates, levels, outlevel, rate_scaling);
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int mode = patch[off + 17];
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int coarse = patch[off + 18];
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int fine = patch[off + 19];
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int detune = patch[off + 20];
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int32_t freq = osc_freq(midinote, mode, coarse, fine, detune);
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opMode[op] = mode;
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basepitch_[op] = freq;
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ampmodsens_[op] = ampmodsenstab[patch[off + 14] & 3];
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}
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for (int i = 0; i < 4; i++) {
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rates[i] = patch[126 + i];
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levels[i] = patch[130 + i];
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}
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pitchenv_.set(rates, levels);
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algorithm_ = patch[134];
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int feedback = patch[135];
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fb_shift_ = feedback != 0 ? FEEDBACK_BITDEPTH - feedback : 16;
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pitchmoddepth_ = (patch[139] * 165) >> 6;
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pitchmodsens_ = pitchmodsenstab[patch[143] & 7];
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ampmoddepth_ = (patch[140] * 165) >> 6;
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}
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void Dx7Note::compute(int32_t *buf, int32_t lfo_val, int32_t lfo_delay, const Controllers *ctrls) {
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// ==== PITCH ====
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uint32_t pmd = pitchmoddepth_ * lfo_delay; // Q32
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int32_t senslfo = pitchmodsens_ * (lfo_val - (1 << 23));
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int32_t pmod_1 = (((int64_t) pmd) * (int64_t) senslfo) >> 39;
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pmod_1 = abs(pmod_1);
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int32_t pmod_2 = (int32_t)(((int64_t)ctrls->pitch_mod * (int64_t)senslfo) >> 14);
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pmod_2 = abs(pmod_2);
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int32_t pitch_mod = max(pmod_1, pmod_2);
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pitch_mod = pitchenv_.getsample() + (pitch_mod * (senslfo < 0 ? -1 : 1));
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// ---- PITCH BEND ----
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int pitchbend = ctrls->values_[kControllerPitch];
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int32_t pb = (pitchbend - 0x2000);
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if (pb != 0) {
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if (ctrls->values_[kControllerPitchStep] == 0) {
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pb = ((float) (pb << 11)) * ((float) ctrls->values_[kControllerPitchRange]) / 12.0;
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} else {
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int stp = 12 / ctrls->values_[kControllerPitchStep];
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pb = pb * stp / 8191;
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pb = (pb * (8191 / stp)) << 11;
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}
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}
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int32_t pitch_base = pb + ctrls->masterTune;
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pitch_mod += pitch_base;
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// ==== AMP MOD ====
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lfo_val = (1<<24) - lfo_val;
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uint32_t amod_1 = (uint32_t)(((int64_t) ampmoddepth_ * (int64_t) lfo_delay) >> 8); // Q24 :D
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amod_1 = (uint32_t)(((int64_t) amod_1 * (int64_t) lfo_val) >> 24);
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uint32_t amod_2 = (uint32_t)(((int64_t) ctrls->amp_mod * (int64_t) lfo_val) >> 7); // Q?? :|
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uint32_t amd_mod = max(amod_1, amod_2);
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// ==== EG AMP MOD ====
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uint32_t amod_3 = (ctrls->eg_mod+1) << 17;
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amd_mod = max((1<<24) - amod_3, amd_mod);
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// ==== OP RENDER ====
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for (int op = 0; op < 6; op++) {
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// if ( ctrls->opSwitch[op] == '0' ) {
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if (!(ctrls->opSwitch & (1<<op))) {
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env_[op].getsample(); // advance the envelop even if it is not playing
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params_[op].level_in = 0;
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} else {
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//int32_t gain = pow(2, 10 + level * (1.0 / (1 << 24)));
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if ( opMode[op] )
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params_[op].freq = Freqlut::lookup(basepitch_[op] + pitch_base);
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else
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params_[op].freq = Freqlut::lookup(basepitch_[op] + pitch_mod);
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int32_t level = env_[op].getsample();
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if (ampmodsens_[op] != 0) {
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uint32_t sensamp = (uint32_t)(((uint64_t) amd_mod) * ((uint64_t) ampmodsens_[op]) >> 24);
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// TODO: mehhh.. this needs some real tuning.
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uint32_t pt = exp(((float)sensamp)/262144 * 0.07 + 12.2);
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uint32_t ldiff = (uint32_t)(((uint64_t)level) * (((uint64_t)pt<<4)) >> 28);
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level -= ldiff;
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}
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params_[op].level_in = level;
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}
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}
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ctrls->core->render(buf, params_, algorithm_, fb_buf_, fb_shift_);
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}
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void Dx7Note::keyup() {
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for (int op = 0; op < 6; op++) {
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env_[op].keydown(false);
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}
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pitchenv_.keydown(false);
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}
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void Dx7Note::update(const uint8_t patch[156], int midinote, int velocity) {
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int rates[4];
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int levels[4];
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for (int op = 0; op < 6; op++) {
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int off = op * 21;
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int mode = patch[off + 17];
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int coarse = patch[off + 18];
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int fine = patch[off + 19];
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int detune = patch[off + 20];
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basepitch_[op] = osc_freq(midinote, mode, coarse, fine, detune);
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ampmodsens_[op] = ampmodsenstab[patch[off + 14] & 3];
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opMode[op] = mode;
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for (int i = 0; i < 4; i++) {
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rates[i] = patch[off + i];
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levels[i] = patch[off + 4 + i];
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}
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int outlevel = patch[off + 16];
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outlevel = Env::scaleoutlevel(outlevel);
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int level_scaling = ScaleLevel(midinote, patch[off + 8], patch[off + 9],
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patch[off + 10], patch[off + 11], patch[off + 12]);
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outlevel += level_scaling;
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outlevel = min(127, outlevel);
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outlevel = outlevel << 5;
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outlevel += ScaleVelocity(velocity, patch[off + 15]);
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outlevel = max(0, outlevel);
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int rate_scaling = ScaleRate(midinote, patch[off + 13]);
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env_[op].update(rates, levels, outlevel, rate_scaling);
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}
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algorithm_ = patch[134];
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int feedback = patch[135];
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fb_shift_ = feedback != 0 ? FEEDBACK_BITDEPTH - feedback : 16;
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pitchmoddepth_ = (patch[139] * 165) >> 6;
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pitchmodsens_ = pitchmodsenstab[patch[143] & 7];
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ampmoddepth_ = (patch[140] * 165) >> 6;
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}
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void Dx7Note::peekVoiceStatus(VoiceStatus &status) {
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for(int i=0;i<6;i++) {
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status.amp[i] = Exp2::lookup(params_[i].level_in - (14 * (1 << 24)));
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env_[i].getPosition(&status.ampStep[i]);
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}
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pitchenv_.getPosition(&status.pitchStep);
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}
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/**
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* Used in monophonic mode to transfert voice state from different notes
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*/
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void Dx7Note::transferState(Dx7Note &src) {
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for (int i=0;i<6;i++) {
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env_[i].transfer(src.env_[i]);
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params_[i].gain_out = src.params_[i].gain_out;
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params_[i].phase = src.params_[i].phase;
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}
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}
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void Dx7Note::transferSignal(Dx7Note &src) {
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for (int i=0;i<6;i++) {
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params_[i].gain_out = src.params_[i].gain_out;
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params_[i].phase = src.params_[i].phase;
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}
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}
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void Dx7Note::oscSync() {
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for (int i=0;i<6;i++) {
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params_[i].gain_out = 0;
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params_[i].phase = 0;
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}
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}
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