mirror of
https://github.com/SourMesen/Mesen.git
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425 lines
9.1 KiB
C++
425 lines
9.1 KiB
C++
//////////////////////////////////////////////////////////////////////////////////////////
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// Adapted from Nintendulator's code, which itself is based on Mitsutaka Okazaki's code //
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// https://www.qmtpro.com/~nes/nintendulator/
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//////////////////////////////////////////////////////////////////////////////////////////
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/* Modified for usage in VRC7 sound emulation
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Copyright (C) Mitsutaka Okazaki 2004
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This software is provided 'as-is', without any express or implied warranty.
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In no event will the authors be held liable for any damages arising from
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the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not
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be misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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/***********************************************************************************
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emu2413.c -- YM2413 emulator written by Mitsutaka Okazaki 2001
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2003 01-24 : Modified by xodnizel to remove code not needed for the VRC7, among other things.
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References:
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fmopl.c -- 1999,2000 written by Tatsuyuki Satoh (MAME development).
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fmopl.c(fixed) -- (C) 2002 Jarek Burczynski.
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s_opl.c -- 2001 written by Mamiya (NEZplug development).
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fmgen.cpp -- 1999,2000 written by cisc.
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fmpac.ill -- 2000 created by NARUTO.
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MSX-Datapack
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YMU757 data sheet
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YM2143 data sheet
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**************************************************************************************/
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#pragma once
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#include "stdafx.h"
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#include "OpllTables.h"
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namespace Vrc7Opll
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{
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/* voice data */
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struct OpllPatch
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{
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uint32_t TL, FB, EG, ML, AR, DR, SL, RR, KR, KL, AM, PM, WF;
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};
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class OpllChannel : public Snapshotable
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{
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private:
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/* Expand x which is s bits to d bits. */
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uint32_t ExpandBits(uint32_t x, uint32_t s, uint32_t d)
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{
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return x << (d-s);
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}
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/* Cut the lower b bit(s) off. */
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uint32_t GetHighBits(uint32_t c, uint32_t b)
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{
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return c >> b;
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}
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int32_t wave2_4pi(int32_t e)
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{
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return (e) >> (SLOT_AMP_BITS - PG_BITS - 1);
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}
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/* Convert Amp(0 to EG_HEIGHT) to Phase(0 to 8PI). */
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int32_t wave2_8pi(int32_t e)
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{
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return e >> (SLOT_AMP_BITS - PG_BITS - 2);
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}
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int32_t EG2DB(int32_t d)
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{
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return d*(int32_t)(EG_STEP / DB_STEP);
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}
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uint32_t SL2EG(int32_t d)
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{
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return d*(int32_t)(SL_STEP / EG_STEP);
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}
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uint32_t S2E(double x)
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{
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return (SL2EG((int32_t)(x / SL_STEP)) << (EG_DP_BITS - EG_BITS));
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}
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shared_ptr<OpllTables> _tables;
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OpllPatch patch;
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int32_t type; /* 0 : modulator 1 : carrier */
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/* OUTPUT */
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int32_t feedback;
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int32_t output[2]; /* Output value of slot */
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/* for Phase Generator (PG) */
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uint16_t *sintbl; /* Wavetable */
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uint32_t phase; /* Phase */
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uint32_t dphase; /* Phase increment amount */
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uint32_t pgout; /* output */
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/* for Envelope Generator (EG) */
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int32_t fnum; /* F-Number */
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int32_t block; /* Block */
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int32_t volume; /* Current volume */
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int32_t sustine; /* Sustine 1 = ON, 0 = OFF */
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uint32_t tll; /* Total Level + Key scale level*/
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uint32_t rks; /* Key scale offset (Rks) */
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int32_t eg_mode; /* Current state */
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uint32_t eg_phase; /* Phase */
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uint32_t eg_dphase; /* Phase increment amount */
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uint32_t egout; /* output */
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protected:
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void StreamState(bool saving) override
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{
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Stream(type, feedback, output[0], output[1], phase, dphase, pgout, fnum, block, volume, sustine, tll, rks, eg_mode, eg_phase, eg_dphase, egout,
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patch.TL, patch.FB, patch.EG, patch.ML, patch.AR, patch.DR, patch.SL, patch.RR, patch.KR, patch.KL, patch.AM, patch.PM, patch.WF);
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if(!saving) {
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UpdateAll();
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}
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}
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public:
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OpllPatch* GetPatch()
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{
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return &patch;
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}
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int32_t GetType()
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{
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return type;
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}
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int32_t GetEgMode()
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{
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return eg_mode;
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}
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void SetTables(shared_ptr<OpllTables> tables)
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{
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_tables = tables;
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}
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void setSustine(int32_t sustine)
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{
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this->sustine = sustine;
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}
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void setVolume(int32_t volume)
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{
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this->volume = volume;
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}
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void setFnumber(int32_t fnum)
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{
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this->fnum = fnum;
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}
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void setBlock(int32_t block)
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{
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this->block = block;
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}
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void reset(int type)
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{
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this->type = type;
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sintbl = _tables->waveform[0];
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phase = 0;
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dphase = 0;
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output[0] = 0;
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output[1] = 0;
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feedback = 0;
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eg_mode = SETTLE;
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eg_phase = EG_DP_WIDTH;
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eg_dphase = 0;
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rks = 0;
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tll = 0;
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sustine = 0;
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fnum = 0;
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block = 0;
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volume = 0;
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pgout = 0;
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egout = 0;
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}
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/* Slot key on */
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void slotOn()
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{
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eg_mode = ATTACK;
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eg_phase = 0;
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phase = 0;
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}
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/* Slot key on without reseting the phase */
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void slotOn2()
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{
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eg_mode = ATTACK;
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eg_phase = 0;
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}
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/* Slot key off */
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void slotOff()
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{
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if(eg_mode == ATTACK) {
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eg_phase = ExpandBits(_tables->AR_ADJUST_TABLE[GetHighBits(eg_phase, EG_DP_BITS - EG_BITS)], EG_BITS, EG_DP_BITS);
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}
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eg_mode = RELEASE;
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}
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void setSlotVolume(int32_t volume)
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{
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this->volume = volume;
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}
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void calc_phase(int32_t lfo)
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{
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if(patch.PM) {
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phase += (dphase * lfo) >> PM_AMP_BITS;
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} else {
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phase += dphase;
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}
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phase &= (DP_WIDTH - 1);
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pgout = GetHighBits(phase, DP_BASE_BITS);
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}
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int32_t calc_slot_car(int32_t fm)
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{
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output[1] = output[0];
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if(egout >= (DB_MUTE - 1)) {
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output[0] = 0;
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} else {
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output[0] = _tables->DB2LIN_TABLE[sintbl[(pgout + wave2_8pi(fm))&(PG_WIDTH - 1)] + egout];
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}
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return (output[1] + output[0]) >> 1;
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}
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int32_t calc_slot_mod()
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{
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int32_t fm;
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output[1] = output[0];
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if(egout >= (DB_MUTE - 1)) {
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output[0] = 0;
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} else if(patch.FB != 0) {
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fm = wave2_4pi(feedback) >> (7 - patch.FB);
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output[0] = _tables->DB2LIN_TABLE[sintbl[(pgout + fm)&(PG_WIDTH - 1)] + egout];
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} else {
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output[0] = _tables->DB2LIN_TABLE[sintbl[pgout] + egout];
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}
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feedback = (output[1] + output[0]) >> 1;
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return feedback;
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}
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void UpdatePg()
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{
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dphase = _tables->dphaseTable[fnum][block][patch.ML];
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}
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void UpdateTll()
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{
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if(type == 0) {
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tll = _tables->tllTable[(fnum) >> 5][block][patch.TL][patch.KL];
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} else {
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tll = _tables->tllTable[(fnum) >> 5][block][volume][patch.KL];
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}
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}
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void UpdateRks()
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{
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rks = _tables->rksTable[(fnum) >> 8][block][patch.KR];
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}
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void UpdateWf()
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{
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sintbl = _tables->waveform[patch.WF];
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}
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void UpdateEg()
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{
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eg_dphase = calc_eg_dphase();
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}
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void UpdateAll()
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{
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UpdatePg();
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UpdateTll();
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UpdateRks();
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UpdateWf();
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UpdateEg(); /* EG should be updated last. */
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}
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uint32_t calc_eg_dphase()
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{
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switch(eg_mode) {
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case ATTACK:
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return _tables->dphaseARTable[patch.AR][rks];
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case DECAY:
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return _tables->dphaseDRTable[patch.DR][rks];
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case SUSHOLD:
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return 0;
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case SUSTINE:
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return _tables->dphaseDRTable[patch.RR][rks];
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case RELEASE:
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if(sustine) {
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return _tables->dphaseDRTable[5][rks];
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} else if(patch.EG) {
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return _tables->dphaseDRTable[patch.RR][rks];
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} else {
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return _tables->dphaseDRTable[7][rks];
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}
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case FINISH:
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return 0;
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default:
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return 0;
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}
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}
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void calc_envelope(int32_t lfo)
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{
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static uint32_t SL[16] = {
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S2E(0.0), S2E(3.0), S2E(6.0), S2E(9.0), S2E(12.0), S2E(15.0), S2E(18.0), S2E(21.0),
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S2E(24.0), S2E(27.0), S2E(30.0), S2E(33.0), S2E(36.0), S2E(39.0), S2E(42.0), S2E(48.0)
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};
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uint32_t egout;
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switch(eg_mode) {
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case ATTACK:
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egout = _tables->AR_ADJUST_TABLE[GetHighBits(eg_phase, EG_DP_BITS - EG_BITS)];
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eg_phase += eg_dphase;
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if((EG_DP_WIDTH & eg_phase) || (patch.AR == 15)) {
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egout = 0;
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eg_phase = 0;
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eg_mode = DECAY;
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UpdateEg();
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}
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break;
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case DECAY:
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egout = GetHighBits(eg_phase, EG_DP_BITS - EG_BITS);
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eg_phase += eg_dphase;
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if(eg_phase >= SL[patch.SL]) {
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if(patch.EG) {
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eg_phase = SL[patch.SL];
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eg_mode = SUSHOLD;
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UpdateEg();
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} else {
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eg_phase = SL[patch.SL];
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eg_mode = SUSTINE;
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UpdateEg();
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}
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}
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break;
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case SUSHOLD:
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egout = GetHighBits(eg_phase, EG_DP_BITS - EG_BITS);
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if(patch.EG == 0) {
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eg_mode = SUSTINE;
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UpdateEg();
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}
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break;
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case SUSTINE:
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case RELEASE:
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egout = GetHighBits(eg_phase, EG_DP_BITS - EG_BITS);
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eg_phase += eg_dphase;
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if(egout >= (1 << EG_BITS)) {
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eg_mode = FINISH;
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egout = (1 << EG_BITS) - 1;
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}
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break;
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case FINISH:
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egout = (1 << EG_BITS) - 1;
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break;
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default:
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egout = (1 << EG_BITS) - 1;
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break;
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}
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if(patch.AM) {
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egout = EG2DB(egout + tll) + lfo;
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} else {
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egout = EG2DB(egout + tll);
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}
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if(egout >= DB_MUTE) {
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egout = DB_MUTE - 1;
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}
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this->egout = egout;
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}
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};
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}
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