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https://github.com/QB64-Phoenix-Edition/QB64pe.git
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Use Opal changes by Wohlstand
This commit is contained in:
parent
13c1a05580
commit
e9cd6b84d3
2 changed files with 36 additions and 110 deletions
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@ -14,12 +14,6 @@
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*/
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// This is the Opal OPL3 emulator from Reality Adlib Tracker v2.0a (http://www.3eality.com/productions/reality-adlib-tracker).
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// It was released by Shayde/Reality into the public domain.
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// Minor modifications to silence some warnings and fix a bug in the envelope generator have been applied.
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// Additional fixes by JP Cimalando.
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// Soft panning support by Wohlstand.
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#include "opal.h"
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// clang-format off
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@ -68,28 +62,6 @@ const uint16_t Opal::LogSinTable[0x100] = {
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7, 7, 6, 6, 5, 5, 5, 4, 4, 4, 3, 3, 3, 2, 2, 2,
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2, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0,
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};
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//--------------------------------------------------------------------------------------------------
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const uint16_t Opal::PanLawTable[128] =
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{
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65535, 65529, 65514, 65489, 65454, 65409, 65354, 65289,
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65214, 65129, 65034, 64929, 64814, 64689, 64554, 64410,
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64255, 64091, 63917, 63733, 63540, 63336, 63123, 62901,
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62668, 62426, 62175, 61914, 61644, 61364, 61075, 60776,
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60468, 60151, 59825, 59489, 59145, 58791, 58428, 58057,
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57676, 57287, 56889, 56482, 56067, 55643, 55211, 54770,
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54320, 53863, 53397, 52923, 52441, 51951, 51453, 50947,
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50433, 49912, 49383, 48846, 48302, 47750, 47191,
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46340, // Center left
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46340, // Center right
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45472, 44885, 44291, 43690, 43083, 42469, 41848, 41221,
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40588, 39948, 39303, 38651, 37994, 37330, 36661, 35986,
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35306, 34621, 33930, 33234, 32533, 31827, 31116, 30400,
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29680, 28955, 28225, 27492, 26754, 26012, 25266, 24516,
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23762, 23005, 22244, 21480, 20713, 19942, 19169, 18392,
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17613, 16831, 16046, 15259, 14469, 13678, 12884, 12088,
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11291, 10492, 9691, 8888, 8085, 7280, 6473, 5666,
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4858, 4050, 3240, 2431, 1620, 810, 0
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};
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// clang-format on
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//==================================================================================================
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@ -99,7 +71,7 @@ const uint16_t Opal::PanLawTable[128] =
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// https://docs.google.com/document/d/18IGx18NQY_Q1PJVZ-bHywao9bhsDoAqoIn1rIm42nwo/edit
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//==================================================================================================
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#if 0
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# include <math.h>
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# include <cmath>
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void GenerateTables() {
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@ -169,7 +141,7 @@ void Opal::Init(int sample_rate) {
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// Add the operators to the channels. Note, some channels can't use all the operators
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// FIXME: put this into a separate routine
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const int chan_ops[] = {
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static const int chan_ops[] = {
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0, 1, 2, 6, 7, 8, 12, 13, 14, 18, 19, 20, 24, 25, 26, 30, 31, 32,
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};
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@ -187,13 +159,6 @@ void Opal::Init(int sample_rate) {
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for (int i = 0; i < NumOperators; i++)
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Op[i].ComputeRates();
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// Initialise channel panning at center.
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for (int i = 0; i < NumChannels; i++) {
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Chan[i].SetPan(64);
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Chan[i].SetLeftEnable(true);
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Chan[i].SetRightEnable(true);
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}
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SetSampleRate(sample_rate);
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}
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@ -216,9 +181,8 @@ void Opal::SetSampleRate(int sample_rate) {
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// Write a value to an OPL3 register.
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//==================================================================================================
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void Opal::Port(uint16_t reg_num, uint8_t val) {
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// clang-format off
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static constexpr int8_t op_lookup[] = {
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static const int op_lookup[] = {
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// 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F
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0, 1, 2, 3, 4, 5, -1, -1, 6, 7, 8, 9, 10, 11, -1, -1,
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// 10 11 12 13 14 15 16 17 18 19 1A 1B 1C 1D 1E 1F
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@ -230,8 +194,8 @@ void Opal::Port(uint16_t reg_num, uint8_t val) {
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// Is it BD, the one-off register stuck in the middle of the register array?
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if (reg_num == 0xBD) {
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TremoloDepth = (val & 0x80) != 0;
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VibratoDepth = (val & 0x40) != 0;
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TremoloDepth = (val & 0x80);
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VibratoDepth = (val & 0x40);
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return;
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}
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@ -246,12 +210,8 @@ void Opal::Port(uint16_t reg_num, uint8_t val) {
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for (int i = 0; i < 6; i++, mask <<= 1) {
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// The 4-op channels are 0, 1, 2, 9, 10, 11
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uint16_t chan = static_cast<uint16_t>(i < 3 ? i : i + 6);
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// cppcheck false-positive
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// cppcheck-suppress arrayIndexOutOfBounds
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uint16_t chan = i < 3 ? i : i + 6;
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Channel *primary = &Chan[chan];
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// cppcheck false-positive
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// cppcheck-suppress arrayIndexOutOfBounds
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Channel *secondary = &Chan[chan + 3];
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if (val & mask) {
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@ -275,7 +235,7 @@ void Opal::Port(uint16_t reg_num, uint8_t val) {
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// CSW / Note-sel
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} else if (reg_num == 0x08) {
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NoteSel = (val & 0x40) != 0;
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NoteSel = (val & 0x40);
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// Get the channels to recompute the Key Scale No. as this varies based on NoteSel
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for (int i = 0; i < NumChannels; i++)
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@ -298,16 +258,15 @@ void Opal::Port(uint16_t reg_num, uint8_t val) {
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Channel &chan = Chan[chan_num];
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// Registers Ax and Cx affect both channels
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Channel *chans[2] = {&chan, chan.GetChannelPair()};
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int numchans = chans[1] ? 2 : 1;
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unsigned numchans = chans[1] ? 2 : 1;
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// Do specific registers
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switch (reg_num & 0xF0) {
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// Frequency low
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case 0xA0: {
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for (int i = 0; i < numchans; i++) {
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for (unsigned i = 0; i < numchans; ++i) {
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chans[i]->SetFrequencyLow(val);
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}
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break;
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@ -315,7 +274,7 @@ void Opal::Port(uint16_t reg_num, uint8_t val) {
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// Key-on / Octave / Frequency High
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case 0xB0: {
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for (int i = 0; i < numchans; i++) {
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for (unsigned i = 0; i < numchans; ++i) {
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chans[i]->SetKeyOn((val & 0x20) != 0);
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chans[i]->SetOctave(val >> 2 & 7);
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chans[i]->SetFrequencyHigh(val & 3);
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@ -325,8 +284,8 @@ void Opal::Port(uint16_t reg_num, uint8_t val) {
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// Right Stereo Channel Enable / Left Stereo Channel Enable / Feedback Factor / Modulation Type
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case 0xC0: {
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chan.SetRightEnable((val & 0x20) != 0);
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chan.SetLeftEnable((val & 0x10) != 0);
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chan.SetRightEnable(val & 0x20);
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chan.SetLeftEnable(val & 0x10);
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chan.SetFeedback(val >> 1 & 7);
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chan.SetModulationType(val & 1);
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break;
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@ -354,10 +313,10 @@ void Opal::Port(uint16_t reg_num, uint8_t val) {
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// Tremolo Enable / Vibrato Enable / Sustain Mode / Envelope Scaling / Frequency Multiplier
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case 0x20: {
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op.SetTremoloEnable((val & 0x80) != 0);
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op.SetVibratoEnable((val & 0x40) != 0);
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op.SetSustainMode((val & 0x20) != 0);
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op.SetEnvelopeScaling((val & 0x10) != 0);
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op.SetTremoloEnable(val & 0x80);
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op.SetVibratoEnable(val & 0x40);
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op.SetSustainMode(val & 0x20);
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op.SetEnvelopeScaling(val & 0x10);
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op.SetFrequencyMultiplier(val & 15);
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break;
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}
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}
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}
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//==================================================================================================
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// Set panning on the channel designated by the register number.
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// This is extended functionality.
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//==================================================================================================
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void Opal::Pan(uint16_t reg_num, uint8_t pan) {
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uint8_t high = (reg_num >> 8) & 1;
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uint8_t regm = reg_num & 0xff;
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Chan[9 * high + (regm & 0x0f)].SetPan(pan);
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}
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//==================================================================================================
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// Generate sample. Every time you call this you will get two signed 16-bit samples (one for each
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// stereo channel) which will sound correct when played back at the sample rate given when the
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@ -422,8 +371,8 @@ void Opal::Sample(int16_t *left, int16_t *right) {
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// Mix with the partial accumulation
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int32_t omblend = SampleRate - SampleAccum;
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*left = static_cast<int16_t>((LastOutput[0] * omblend + CurrOutput[0] * SampleAccum) / SampleRate);
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*right = static_cast<int16_t>((LastOutput[1] * omblend + CurrOutput[1] * SampleAccum) / SampleRate);
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*left = (LastOutput[0] * omblend + CurrOutput[0] * SampleAccum) / SampleRate;
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*right = (LastOutput[1] * omblend + CurrOutput[1] * SampleAccum) / SampleRate;
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SampleAccum += OPL3SampleRate;
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}
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else if (leftmix > 0x7FFF)
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left = 0x7FFF;
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else
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left = static_cast<int16_t>(leftmix);
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left = leftmix;
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if (rightmix < -0x8000)
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right = -0x8000;
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else if (rightmix > 0x7FFF)
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right = 0x7FFF;
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else
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right = static_cast<int16_t>(rightmix);
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right = rightmix;
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Clock++;
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@ -521,13 +470,12 @@ void Opal::Channel::Output(int16_t &left, int16_t &right) {
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else {
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if (clk & 1)
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vibrato >>= 1; // Odd positions are half the magnitude
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vibrato <<= Octave;
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if (clk & 4)
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vibrato = -vibrato; // The second half positions are negative
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}
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vibrato <<= Octave;
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// Combine individual operator outputs
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int16_t out, acc;
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left = LeftEnable ? out : 0;
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right = RightEnable ? out : 0;
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left = left * LeftPan / 65536;
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right = right * RightPan / 65536;
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}
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//==================================================================================================
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//==================================================================================================
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void Opal::Channel::SetRightEnable(bool on) { RightEnable = on; }
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//==================================================================================================
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// Pan the channel to the position given.
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//==================================================================================================
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void Opal::Channel::SetPan(uint8_t pan) {
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pan &= 127;
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LeftPan = PanLawTable[pan];
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RightPan = PanLawTable[127 - pan];
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}
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//==================================================================================================
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// Set the channel feedback amount.
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//==================================================================================================
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//==================================================================================================
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// Produce output from operator.
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//==================================================================================================
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int16_t Opal::Operator::Output(uint16_t /*keyscalenum*/, uint32_t phase_step, int16_t vibrato, int16_t mod, int16_t fbshift) {
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int16_t Opal::Operator::Output(uint16_t keyscalenum, uint32_t phase_step, int16_t vibrato, int16_t mod, int16_t fbshift) {
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// Advance wave phase
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if (VibratoEnable)
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@ -771,7 +707,6 @@ int16_t Opal::Operator::Output(uint16_t /*keyscalenum*/, uint32_t phase_step, in
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break;
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// Note: fall-through!
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[[fallthrough]];
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}
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// Release stage
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if (fbshift)
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mod += (Out[0] + Out[1]) >> fbshift;
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uint16_t phase = static_cast<uint16_t>(Phase >> 10) + mod;
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uint16_t phase = (Phase >> 10) + mod;
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uint16_t offset = phase & 0xFF;
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uint16_t logsin;
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bool negate = false;
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if (phase & 0x100)
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offset ^= 0xFF;
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logsin = Master->LogSinTable[offset];
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negate = (phase & 0x200) != 0;
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negate = (phase & 0x200);
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break;
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//------------------------------------
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@ -860,7 +795,7 @@ int16_t Opal::Operator::Output(uint16_t /*keyscalenum*/, uint32_t phase_step, in
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offset ^= 0xFF;
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offset = (offset + offset) & 0xFF;
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negate = (phase & 0x100) != 0;
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negate = (phase & 0x100);
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}
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logsin = Master->LogSinTable[offset];
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//------------------------------------
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case 6:
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logsin = 0;
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negate = (phase & 0x200) != 0;
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negate = (phase & 0x200);
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break;
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//------------------------------------
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@ -913,7 +848,8 @@ int16_t Opal::Operator::Output(uint16_t /*keyscalenum*/, uint32_t phase_step, in
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// position given by the 8 LSB's of the input. The value + 1024 (the hidden bit) is then the
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// significand of the floating point output and the yet unused MSB's of the input are the
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// exponent of the floating point output."
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int16_t v = (Master->ExpTable[mix & 0xFF] + 1024u) >> (mix >> 8u);
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int16_t v = Master->ExpTable[mix & 0xFF] + 1024;
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v >>= mix >> 8;
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v += v;
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if (negate)
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v = ~v;
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// Needs to be multiplied by two (and divided by two later when we use it) because the first
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// entry is actually .5
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const uint16_t mul_times_2[] = {
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static const uint16_t mul_times_2[] = {
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1, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 20, 24, 24, 30, 30,
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};
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//==================================================================================================
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void Opal::Operator::SetKeyScale(uint16_t scale) {
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static const uint8_t KeyScaleShiftTable[4] = {8, 1, 2, 0};
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static const unsigned KeyScaleShiftTable[4] = {8, 1, 2, 0};
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KeyScaleShift = KeyScaleShiftTable[scale & 3];
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ComputeKeyScaleLevel();
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}
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@ -1071,7 +1008,7 @@ void Opal::Operator::ComputeRates() {
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int rate_high = combined_rate >> 2;
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int rate_low = combined_rate & 3;
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AttackShift = static_cast<uint16_t>(rate_high < 12 ? 12 - rate_high : 0);
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AttackShift = rate_high < 12 ? 12 - rate_high : 0;
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AttackMask = (1 << AttackShift) - 1;
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AttackAdd = (rate_high < 12) ? 1 : 1 << (rate_high - 12);
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AttackTab = Master->RateTables[rate_low];
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rate_high = combined_rate >> 2;
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rate_low = combined_rate & 3;
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DecayShift = static_cast<uint16_t>(rate_high < 12 ? 12 - rate_high : 0);
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DecayShift = rate_high < 12 ? 12 - rate_high : 0;
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DecayMask = (1 << DecayShift) - 1;
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DecayAdd = (rate_high < 12) ? 1 : 1 << (rate_high - 12);
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DecayTab = Master->RateTables[rate_low];
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@ -1093,7 +1030,7 @@ void Opal::Operator::ComputeRates() {
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rate_high = combined_rate >> 2;
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rate_low = combined_rate & 3;
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ReleaseShift = static_cast<uint16_t>(rate_high < 12 ? 12 - rate_high : 0);
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ReleaseShift = rate_high < 12 ? 12 - rate_high : 0;
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ReleaseMask = (1 << ReleaseShift) - 1;
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ReleaseAdd = (rate_high < 12) ? 1 : 1 << (rate_high - 12);
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ReleaseTab = Master->RateTables[rate_low];
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@ -1104,9 +1041,8 @@ void Opal::Operator::ComputeRates() {
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// operator key scale value.
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//==================================================================================================
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void Opal::Operator::ComputeKeyScaleLevel() {
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// clang-format off
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static constexpr uint8_t levtab[] = {
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static const uint16_t levtab[] = {
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 8, 12, 16, 20, 24, 28, 32,
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0, 0, 0, 0, 0, 12, 20, 28, 32, 40, 44, 48, 52, 56, 60, 64,
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@ -14,12 +14,6 @@
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*/
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// This is the Opal OPL3 emulator from Reality Adlib Tracker v2.0a (http://www.3eality.com/productions/reality-adlib-tracker).
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// It was released by Shayde/Reality into the public domain.
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// Minor modifications to silence some warnings and fix a bug in the envelope generator have been applied.
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||||
// Additional fixes by JP Cimalando.
|
||||
// Soft panning support by Wohlstand.
|
||||
|
||||
#pragma once
|
||||
|
||||
#include <cstdint>
|
||||
|
@ -137,7 +131,6 @@ class Opal {
|
|||
void SetOctave(uint16_t oct);
|
||||
void SetLeftEnable(bool on);
|
||||
void SetRightEnable(bool on);
|
||||
void SetPan(uint8_t pan);
|
||||
void SetFeedback(uint16_t val);
|
||||
void SetModulationType(uint16_t type);
|
||||
|
||||
|
@ -164,7 +157,6 @@ class Opal {
|
|||
Channel *ChannelPair;
|
||||
bool Enable;
|
||||
bool LeftEnable, RightEnable;
|
||||
uint16_t LeftPan, RightPan;
|
||||
};
|
||||
|
||||
public:
|
||||
|
@ -175,7 +167,6 @@ class Opal {
|
|||
|
||||
void SetSampleRate(int sample_rate);
|
||||
void Port(uint16_t reg_num, uint8_t val);
|
||||
void Pan(uint16_t reg_num, uint8_t pan);
|
||||
void Sample(int16_t *left, int16_t *right);
|
||||
|
||||
protected:
|
||||
|
@ -201,5 +192,4 @@ class Opal {
|
|||
static const uint16_t RateTables[4][8];
|
||||
static const uint16_t ExpTable[256];
|
||||
static const uint16_t LogSinTable[256];
|
||||
static const uint16_t PanLawTable[128];
|
||||
};
|
||||
|
|
Loading…
Reference in a new issue