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https://github.com/libretro/Mesen.git
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399 lines
10 KiB
C++
399 lines
10 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 "Snapshotable.h"
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namespace Vrc7Opll {
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/* Size of Sintable ( 8 -- 18 can be used. 9 recommended.)*/
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const int32_t PG_BITS = 9;
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const int32_t PG_WIDTH = 1 << PG_BITS;
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/* Phase increment counter */
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const int32_t DP_BITS = 18;
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const int32_t DP_WIDTH = 1 << DP_BITS;
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const int32_t DP_BASE_BITS = DP_BITS - PG_BITS;
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/* Dynamic range (Accuracy of sin table) */
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const int32_t DB_BITS = 8;
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const double DB_STEP = (48.0 / (1 << DB_BITS));
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const int32_t DB_MUTE = 1 << DB_BITS;
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/* Dynamic range of envelope */
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const double EG_STEP = 0.375;
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const int32_t EG_BITS = 7;
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const int32_t EG_MUTE = (1 << EG_BITS);
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/* Dynamic range of total level */
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const double TL_STEP = 0.75;
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const int32_t TL_BITS = 6;
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const int32_t TL_MUTE = (1 << TL_BITS);
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/* Dynamic range of sustine level */
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const double SL_STEP = 3.0;
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const int32_t SL_BITS = 4;
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const int32_t SL_MUTE = (1 << SL_BITS);
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/* Bits for liner value */
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const int32_t DB2LIN_AMP_BITS = 11;
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const int32_t SLOT_AMP_BITS = DB2LIN_AMP_BITS;
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/* Bits for envelope phase incremental counter */
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const int32_t EG_DP_BITS = 22;
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const int32_t EG_DP_WIDTH = (1 << EG_DP_BITS);
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/* Bits for Pitch and Amp modulator */
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const int32_t PM_PG_BITS = 8;
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const int32_t PM_PG_WIDTH = (1 << PM_PG_BITS);
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const int32_t PM_DP_BITS = 16;
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const int32_t PM_DP_WIDTH = (1 << PM_DP_BITS);
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const int32_t AM_PG_BITS = 8;
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const int32_t AM_PG_WIDTH = (1 << AM_PG_BITS);
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const int32_t AM_DP_BITS = 16;
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const int32_t AM_DP_WIDTH = (1 << AM_DP_BITS);
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/* PM table is calcurated by PM_AMP * pow(2,PM_DEPTH*sin(x)/1200) */
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const int32_t PM_AMP_BITS = 8;
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const int32_t PM_AMP = (1 << PM_AMP_BITS);
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/* PM speed(Hz) and depth(cent) */
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const double PM_SPEED = 6.4;
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const double PM_DEPTH = 13.75;
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/* AM speed(Hz) and depth(dB) */
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const double AM_SPEED = 3.7;
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const double AM_DEPTH = 4.8;
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const double PI = 3.14159265358979323846;
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/* Definition of envelope mode */
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enum
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{
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SETTLE, ATTACK, DECAY, SUSHOLD, SUSTINE, RELEASE, FINISH
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};
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class OpllTables : public Snapshotable
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{
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private:
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/* Convert Amp(0 to EG_HEIGHT) to Phase(0 to 4PI). */
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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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uint32_t TL2EG(uint32_t d)
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{
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return d*(int32_t)(TL_STEP / EG_STEP);
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}
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/* Adjust envelope speed which depends on sampling rate. */
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uint32_t rate_adjust(double x)
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{
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return (uint32_t)((rate == 49716 ? x : ((double)(x)*clk / 72 / rate + 0.5))); /* added 0.5 to round the value*/
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}
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protected:
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void StreamState(bool saving) override
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{
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Stream(clk, rate);
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if(!saving) {
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maketables(clk, rate);
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}
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}
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public:
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/* Input clock */
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uint32_t clk = 844451141;
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/* Sampling rate */
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uint32_t rate = 3354932;
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/* WaveTable for each envelope amp */
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uint16_t fullsintable[PG_WIDTH];
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uint16_t halfsintable[PG_WIDTH];
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/* LFO Table */
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int32_t pmtable[PM_PG_WIDTH];
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int32_t amtable[AM_PG_WIDTH];
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/* dB to Liner table */
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int16_t DB2LIN_TABLE[(DB_MUTE + DB_MUTE) * 2];
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/* Liner to Log curve conversion table (for Attack rate). */
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uint16_t AR_ADJUST_TABLE[1 << EG_BITS];
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/* Phase incr table for Attack */
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uint32_t dphaseARTable[16][16];
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/* Phase incr table for Decay and Release */
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uint32_t dphaseDRTable[16][16];
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/* KSL + TL Table */
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uint32_t tllTable[16][8][1 << TL_BITS][4];
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int32_t rksTable[2][8][2];
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/* Phase incr table for PG */
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uint32_t dphaseTable[512][8][16];
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uint16_t *waveform[2] = { fullsintable, halfsintable };
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/* Phase delta for LFO */
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uint32_t pm_dphase;
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uint32_t am_dphase;
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/* Table for AR to LogCurve. */
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void makeAdjustTable()
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{
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int32_t i;
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AR_ADJUST_TABLE[0] = (1 << EG_BITS);
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for(i = 1; i < 128; i++)
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AR_ADJUST_TABLE[i] = (uint16_t)((double)(1 << EG_BITS) - 1 - (1 << EG_BITS) * log((double)i) / log(128.0));
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}
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/* Table for dB(0 -- (1<<DB_BITS)-1) to Liner(0 -- DB2LIN_AMP_WIDTH) */
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void makeDB2LinTable()
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{
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int32_t i;
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for(i = 0; i < DB_MUTE + DB_MUTE; i++) {
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DB2LIN_TABLE[i] = (int16_t)((double)((1 << DB2LIN_AMP_BITS) - 1) * pow(10.0, -(double)i * DB_STEP / 20));
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if(i >= DB_MUTE) DB2LIN_TABLE[i] = 0;
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DB2LIN_TABLE[i + DB_MUTE + DB_MUTE] = (int16_t)(-DB2LIN_TABLE[i]);
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}
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}
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/* Liner(+0.0 - +1.0) to dB((1<<DB_BITS) - 1 -- 0) */
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int32_t lin2db(double d)
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{
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if(d == 0)
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return (DB_MUTE - 1);
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else
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return Min(-(int32_t)(20.0 * log10(d) / DB_STEP), DB_MUTE - 1); /* 0 -- 127 */
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}
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/* Sin Table */
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void makeSinTable(void)
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{
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int32_t i;
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for(i = 0; i < PG_WIDTH / 4; i++) {
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fullsintable[i] = (uint16_t)lin2db(sin(2.0 * PI * i / PG_WIDTH));
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}
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for(i = 0; i < PG_WIDTH / 4; i++) {
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fullsintable[PG_WIDTH / 2 - 1 - i] = fullsintable[i];
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}
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for(i = 0; i < PG_WIDTH / 2; i++) {
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fullsintable[PG_WIDTH / 2 + i] = (uint16_t)(DB_MUTE + DB_MUTE + fullsintable[i]);
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}
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for(i = 0; i < PG_WIDTH / 2; i++)
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halfsintable[i] = fullsintable[i];
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for(i = PG_WIDTH / 2; i < PG_WIDTH; i++)
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halfsintable[i] = fullsintable[0];
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}
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/* Table for Pitch Modulator */
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void makePmTable(void)
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{
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int32_t i;
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for(i = 0; i < PM_PG_WIDTH; i++)
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pmtable[i] = (int32_t)((double)PM_AMP * pow(2.0, (double)PM_DEPTH * sin(2.0 * PI * i / PM_PG_WIDTH) / 1200));
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}
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/* Table for Amp Modulator */
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void makeAmTable(void)
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{
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int32_t i;
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for(i = 0; i < AM_PG_WIDTH; i++)
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amtable[i] = (int32_t)((double)AM_DEPTH / 2 / DB_STEP * (1.0 + sin(2.0 * PI * i / PM_PG_WIDTH)));
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}
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/* Phase increment counter table */
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void makeDphaseTable(void)
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{
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uint32_t fnum, block, ML;
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uint32_t mltable[16] =
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{ 1, 1 * 2, 2 * 2, 3 * 2, 4 * 2, 5 * 2, 6 * 2, 7 * 2, 8 * 2, 9 * 2, 10 * 2, 10 * 2, 12 * 2, 12 * 2, 15 * 2, 15 * 2 };
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for(fnum = 0; fnum < 512; fnum++)
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for(block = 0; block < 8; block++)
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for(ML = 0; ML < 16; ML++)
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dphaseTable[fnum][block][ML] = rate_adjust(((fnum * mltable[ML]) << block) >> (20 - DP_BITS));
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}
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void makeTllTable(void)
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{
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static double kltable[16] = {
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0.00, 18.00, 24.00, 27.75, 30.00, 32.25, 33.75, 35.25,
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36.00, 37.50, 38.25, 39.00, 39.75, 40.50, 41.25, 42.00
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};
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int32_t tmp;
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int32_t fnum, block, TL, KL;
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for(fnum = 0; fnum < 16; fnum++)
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for(block = 0; block < 8; block++)
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for(TL = 0; TL < 64; TL++)
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for(KL = 0; KL < 4; KL++) {
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if(KL == 0) {
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tllTable[fnum][block][TL][KL] = TL2EG(TL);
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} else {
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tmp = (int32_t)(kltable[fnum] - 6.000 * (7 - block));
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if(tmp <= 0)
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tllTable[fnum][block][TL][KL] = TL2EG(TL);
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else
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tllTable[fnum][block][TL][KL] = (uint32_t)((tmp >> (3 - KL)) / EG_STEP) + TL2EG(TL);
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}
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}
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}
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/* Rate Table for Attack */
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void makeDphaseARTable(void)
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{
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int32_t AR, Rks, RM, RL;
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for(AR = 0; AR < 16; AR++)
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for(Rks = 0; Rks < 16; Rks++) {
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RM = AR + (Rks >> 2);
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RL = Rks & 3;
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if(RM > 15)
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RM = 15;
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switch(AR) {
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case 0:
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dphaseARTable[AR][Rks] = 0;
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break;
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case 15:
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dphaseARTable[AR][Rks] = 0;/*EG_DP_WIDTH;*/
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break;
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default:
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dphaseARTable[AR][Rks] = rate_adjust((3 * (RL + 4) << (RM + 1)));
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break;
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}
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}
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}
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/* Rate Table for Decay and Release */
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void makeDphaseDRTable(void)
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{
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int32_t DR, Rks, RM, RL;
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for(DR = 0; DR < 16; DR++)
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for(Rks = 0; Rks < 16; Rks++) {
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RM = DR + (Rks >> 2);
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RL = Rks & 3;
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if(RM > 15)
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RM = 15;
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switch(DR) {
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case 0:
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dphaseDRTable[DR][Rks] = 0;
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break;
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default:
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dphaseDRTable[DR][Rks] = rate_adjust((RL + 4) << (RM - 1));
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break;
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}
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}
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}
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void makeRksTable(void)
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{
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int32_t fnum8, block, KR;
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for(fnum8 = 0; fnum8 < 2; fnum8++)
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for(block = 0; block < 8; block++)
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for(KR = 0; KR < 2; KR++) {
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if(KR != 0)
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rksTable[fnum8][block][KR] = (block << 1) + fnum8;
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else
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rksTable[fnum8][block][KR] = block >> 1;
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}
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}
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int32_t Min(int32_t i, int32_t j)
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{
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if(i < j)
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return i;
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else
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return j;
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}
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void internal_refresh()
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{
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makeDphaseTable();
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makeDphaseARTable();
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makeDphaseDRTable();
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pm_dphase = (uint32_t)rate_adjust(PM_SPEED * PM_DP_WIDTH / (clk / 72));
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am_dphase = (uint32_t)rate_adjust(AM_SPEED * AM_DP_WIDTH / (clk / 72));
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}
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void maketables(uint32_t c, uint32_t r)
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{
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clk = c;
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makePmTable();
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makeAmTable();
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makeDB2LinTable();
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makeAdjustTable();
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makeTllTable();
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makeRksTable();
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makeSinTable();
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//makeDefaultPatch ();
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rate = r;
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internal_refresh();
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}
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};
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} |