323 lines
12 KiB
C
323 lines
12 KiB
C
|
// BSD 3-Clause License
|
||
|
|
//
|
||
|
|
// Copyright (c) 2021, Aaron Giles
|
||
|
|
// All rights reserved.
|
||
|
|
//
|
||
|
|
// Redistribution and use in source and binary forms, with or without
|
||
|
|
// modification, are permitted provided that the following conditions are met:
|
||
|
|
//
|
||
|
|
// 1. Redistributions of source code must retain the above copyright notice, this
|
||
|
|
// list of conditions and the following disclaimer.
|
||
|
|
//
|
||
|
|
// 2. Redistributions in binary form must reproduce the above copyright notice,
|
||
|
|
// this list of conditions and the following disclaimer in the documentation
|
||
|
|
// and/or other materials provided with the distribution.
|
||
|
|
//
|
||
|
|
// 3. Neither the name of the copyright holder nor the names of its
|
||
|
|
// contributors may be used to endorse or promote products derived from
|
||
|
|
// this software without specific prior written permission.
|
||
|
|
//
|
||
|
|
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
||
|
|
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||
|
|
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
||
|
|
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
|
||
|
|
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
||
|
|
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
||
|
|
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
|
||
|
|
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
||
|
|
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
||
|
|
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
||
|
|
|
||
|
|
#ifndef YMFM_OPM_H
|
||
|
|
#define YMFM_OPM_H
|
||
|
|
|
||
|
|
#pragma once
|
||
|
|
|
||
|
|
#include "ymfm.h"
|
||
|
|
#include "ymfm_fm.h"
|
||
|
|
|
||
|
|
namespace ymfm
|
||
|
|
{
|
||
|
|
|
||
|
|
//*********************************************************
|
||
|
|
// REGISTER CLASSES
|
||
|
|
//*********************************************************
|
||
|
|
|
||
|
|
// ======================> opm_registers
|
||
|
|
|
||
|
|
//
|
||
|
|
// OPM register map:
|
||
|
|
//
|
||
|
|
// System-wide registers:
|
||
|
|
// 01 xxxxxx-x Test register
|
||
|
|
// ------x- LFO reset
|
||
|
|
// 08 -x------ Key on/off operator 4
|
||
|
|
// --x----- Key on/off operator 3
|
||
|
|
// ---x---- Key on/off operator 2
|
||
|
|
// ----x--- Key on/off operator 1
|
||
|
|
// -----xxx Channel select
|
||
|
|
// 0F x------- Noise enable
|
||
|
|
// ---xxxxx Noise frequency
|
||
|
|
// 10 xxxxxxxx Timer A value (upper 8 bits)
|
||
|
|
// 11 ------xx Timer A value (lower 2 bits)
|
||
|
|
// 12 xxxxxxxx Timer B value
|
||
|
|
// 14 x------- CSM mode
|
||
|
|
// --x----- Reset timer B
|
||
|
|
// ---x---- Reset timer A
|
||
|
|
// ----x--- Enable timer B
|
||
|
|
// -----x-- Enable timer A
|
||
|
|
// ------x- Load timer B
|
||
|
|
// -------x Load timer A
|
||
|
|
// 18 xxxxxxxx LFO frequency
|
||
|
|
// 19 0xxxxxxx AM LFO depth
|
||
|
|
// 1xxxxxxx PM LFO depth
|
||
|
|
// 1B xx------ CT (2 output data lines)
|
||
|
|
// ------xx LFO waveform
|
||
|
|
//
|
||
|
|
// Per-channel registers (channel in address bits 0-2)
|
||
|
|
// 20-27 x------- Pan right
|
||
|
|
// -x------ Pan left
|
||
|
|
// --xxx--- Feedback level for operator 1 (0-7)
|
||
|
|
// -----xxx Operator connection algorithm (0-7)
|
||
|
|
// 28-2F -xxxxxxx Key code
|
||
|
|
// 30-37 xxxxxx-- Key fraction
|
||
|
|
// 38-3F -xxx---- LFO PM sensitivity
|
||
|
|
// ------xx LFO AM shift
|
||
|
|
//
|
||
|
|
// Per-operator registers (channel in address bits 0-2, operator in bits 3-4)
|
||
|
|
// 40-5F -xxx---- Detune value (0-7)
|
||
|
|
// ----xxxx Multiple value (0-15)
|
||
|
|
// 60-7F -xxxxxxx Total level (0-127)
|
||
|
|
// 80-9F xx------ Key scale rate (0-3)
|
||
|
|
// ---xxxxx Attack rate (0-31)
|
||
|
|
// A0-BF x------- LFO AM enable
|
||
|
|
// ---xxxxx Decay rate (0-31)
|
||
|
|
// C0-DF xx------ Detune 2 value (0-3)
|
||
|
|
// ---xxxxx Sustain rate (0-31)
|
||
|
|
// E0-FF xxxx---- Sustain level (0-15)
|
||
|
|
// ----xxxx Release rate (0-15)
|
||
|
|
//
|
||
|
|
// Internal (fake) registers:
|
||
|
|
// 1A -xxxxxxx PM depth
|
||
|
|
//
|
||
|
|
|
||
|
|
class opm_registers : public fm_registers_base
|
||
|
|
{
|
||
|
|
// LFO waveforms are 256 entries long
|
||
|
|
static constexpr uint32_t LFO_WAVEFORM_LENGTH = 256;
|
||
|
|
|
||
|
|
public:
|
||
|
|
// constants
|
||
|
|
static constexpr uint32_t OUTPUTS = 2;
|
||
|
|
static constexpr uint32_t CHANNELS = 8;
|
||
|
|
static constexpr uint32_t ALL_CHANNELS = (1 << CHANNELS) - 1;
|
||
|
|
static constexpr uint32_t OPERATORS = CHANNELS * 4;
|
||
|
|
static constexpr uint32_t WAVEFORMS = 1;
|
||
|
|
static constexpr uint32_t REGISTERS = 0x100;
|
||
|
|
static constexpr uint32_t DEFAULT_PRESCALE = 2;
|
||
|
|
static constexpr uint32_t EG_CLOCK_DIVIDER = 3;
|
||
|
|
static constexpr uint32_t CSM_TRIGGER_MASK = ALL_CHANNELS;
|
||
|
|
static constexpr uint32_t REG_MODE = 0x14;
|
||
|
|
static constexpr uint8_t STATUS_TIMERA = 0x01;
|
||
|
|
static constexpr uint8_t STATUS_TIMERB = 0x02;
|
||
|
|
static constexpr uint8_t STATUS_BUSY = 0x80;
|
||
|
|
static constexpr uint8_t STATUS_IRQ = 0;
|
||
|
|
|
||
|
|
// constructor
|
||
|
|
opm_registers();
|
||
|
|
|
||
|
|
// reset to initial state
|
||
|
|
void reset();
|
||
|
|
|
||
|
|
// save/restore
|
||
|
|
void save_restore(ymfm_saved_state &state);
|
||
|
|
|
||
|
|
// map channel number to register offset
|
||
|
|
static constexpr uint32_t channel_offset(uint32_t chnum)
|
||
|
|
{
|
||
|
|
assert(chnum < CHANNELS);
|
||
|
|
return chnum;
|
||
|
|
}
|
||
|
|
|
||
|
|
// map operator number to register offset
|
||
|
|
static constexpr uint32_t operator_offset(uint32_t opnum)
|
||
|
|
{
|
||
|
|
assert(opnum < OPERATORS);
|
||
|
|
return opnum;
|
||
|
|
}
|
||
|
|
|
||
|
|
// return an array of operator indices for each channel
|
||
|
|
struct operator_mapping { uint32_t chan[CHANNELS]; };
|
||
|
|
void operator_map(operator_mapping &dest) const;
|
||
|
|
|
||
|
|
// handle writes to the register array
|
||
|
|
bool write(uint16_t index, uint8_t data, uint32_t &chan, uint32_t &opmask);
|
||
|
|
|
||
|
|
// clock the noise and LFO, if present, returning LFO PM value
|
||
|
|
int32_t clock_noise_and_lfo();
|
||
|
|
|
||
|
|
// return the AM offset from LFO for the given channel
|
||
|
|
uint32_t lfo_am_offset(uint32_t choffs) const;
|
||
|
|
|
||
|
|
// return the current noise state, gated by the noise clock
|
||
|
|
uint32_t noise_state() const { return m_noise_state; }
|
||
|
|
|
||
|
|
// caching helpers
|
||
|
|
void cache_operator_data(uint32_t choffs, uint32_t opoffs, opdata_cache &cache);
|
||
|
|
|
||
|
|
// compute the phase step, given a PM value
|
||
|
|
uint32_t compute_phase_step(uint32_t choffs, uint32_t opoffs, opdata_cache const &cache, int32_t lfo_raw_pm);
|
||
|
|
|
||
|
|
// log a key-on event
|
||
|
|
std::string log_keyon(uint32_t choffs, uint32_t opoffs);
|
||
|
|
|
||
|
|
// system-wide registers
|
||
|
|
uint32_t test() const { return byte(0x01, 0, 8); }
|
||
|
|
uint32_t lfo_reset() const { return byte(0x01, 1, 1); }
|
||
|
|
uint32_t noise_frequency() const { return byte(0x0f, 0, 5) ^ 0x1f; }
|
||
|
|
uint32_t noise_enable() const { return byte(0x0f, 7, 1); }
|
||
|
|
uint32_t timer_a_value() const { return word(0x10, 0, 8, 0x11, 0, 2); }
|
||
|
|
uint32_t timer_b_value() const { return byte(0x12, 0, 8); }
|
||
|
|
uint32_t csm() const { return byte(0x14, 7, 1); }
|
||
|
|
uint32_t reset_timer_b() const { return byte(0x14, 5, 1); }
|
||
|
|
uint32_t reset_timer_a() const { return byte(0x14, 4, 1); }
|
||
|
|
uint32_t enable_timer_b() const { return byte(0x14, 3, 1); }
|
||
|
|
uint32_t enable_timer_a() const { return byte(0x14, 2, 1); }
|
||
|
|
uint32_t load_timer_b() const { return byte(0x14, 1, 1); }
|
||
|
|
uint32_t load_timer_a() const { return byte(0x14, 0, 1); }
|
||
|
|
uint32_t lfo_rate() const { return byte(0x18, 0, 8); }
|
||
|
|
uint32_t lfo_am_depth() const { return byte(0x19, 0, 7); }
|
||
|
|
uint32_t lfo_pm_depth() const { return byte(0x1a, 0, 7); }
|
||
|
|
uint32_t output_bits() const { return byte(0x1b, 6, 2); }
|
||
|
|
uint32_t lfo_waveform() const { return byte(0x1b, 0, 2); }
|
||
|
|
|
||
|
|
// per-channel registers
|
||
|
|
uint32_t ch_output_any(uint32_t choffs) const { return byte(0x20, 6, 2, choffs); }
|
||
|
|
uint32_t ch_output_0(uint32_t choffs) const { return byte(0x20, 6, 1, choffs); }
|
||
|
|
uint32_t ch_output_1(uint32_t choffs) const { return byte(0x20, 7, 1, choffs); }
|
||
|
|
uint32_t ch_output_2(uint32_t choffs) const { return 0; }
|
||
|
|
uint32_t ch_output_3(uint32_t choffs) const { return 0; }
|
||
|
|
uint32_t ch_feedback(uint32_t choffs) const { return byte(0x20, 3, 3, choffs); }
|
||
|
|
uint32_t ch_algorithm(uint32_t choffs) const { return byte(0x20, 0, 3, choffs); }
|
||
|
|
uint32_t ch_block_freq(uint32_t choffs) const { return word(0x28, 0, 7, 0x30, 2, 6, choffs); }
|
||
|
|
uint32_t ch_lfo_pm_sens(uint32_t choffs) const { return byte(0x38, 4, 3, choffs); }
|
||
|
|
uint32_t ch_lfo_am_sens(uint32_t choffs) const { return byte(0x38, 0, 2, choffs); }
|
||
|
|
|
||
|
|
// per-operator registers
|
||
|
|
uint32_t op_detune(uint32_t opoffs) const { return byte(0x40, 4, 3, opoffs); }
|
||
|
|
uint32_t op_multiple(uint32_t opoffs) const { return byte(0x40, 0, 4, opoffs); }
|
||
|
|
uint32_t op_total_level(uint32_t opoffs) const { return byte(0x60, 0, 7, opoffs); }
|
||
|
|
uint32_t op_ksr(uint32_t opoffs) const { return byte(0x80, 6, 2, opoffs); }
|
||
|
|
uint32_t op_attack_rate(uint32_t opoffs) const { return byte(0x80, 0, 5, opoffs); }
|
||
|
|
uint32_t op_lfo_am_enable(uint32_t opoffs) const { return byte(0xa0, 7, 1, opoffs); }
|
||
|
|
uint32_t op_decay_rate(uint32_t opoffs) const { return byte(0xa0, 0, 5, opoffs); }
|
||
|
|
uint32_t op_detune2(uint32_t opoffs) const { return byte(0xc0, 6, 2, opoffs); }
|
||
|
|
uint32_t op_sustain_rate(uint32_t opoffs) const { return byte(0xc0, 0, 5, opoffs); }
|
||
|
|
uint32_t op_sustain_level(uint32_t opoffs) const { return byte(0xe0, 4, 4, opoffs); }
|
||
|
|
uint32_t op_release_rate(uint32_t opoffs) const { return byte(0xe0, 0, 4, opoffs); }
|
||
|
|
|
||
|
|
protected:
|
||
|
|
// return a bitfield extracted from a byte
|
||
|
|
uint32_t byte(uint32_t offset, uint32_t start, uint32_t count, uint32_t extra_offset = 0) const
|
||
|
|
{
|
||
|
|
return bitfield(m_regdata[offset + extra_offset], start, count);
|
||
|
|
}
|
||
|
|
|
||
|
|
// return a bitfield extracted from a pair of bytes, MSBs listed first
|
||
|
|
uint32_t word(uint32_t offset1, uint32_t start1, uint32_t count1, uint32_t offset2, uint32_t start2, uint32_t count2, uint32_t extra_offset = 0) const
|
||
|
|
{
|
||
|
|
return (byte(offset1, start1, count1, extra_offset) << count2) | byte(offset2, start2, count2, extra_offset);
|
||
|
|
}
|
||
|
|
|
||
|
|
// internal state
|
||
|
|
uint32_t m_lfo_counter; // LFO counter
|
||
|
|
uint32_t m_noise_lfsr; // noise LFSR state
|
||
|
|
uint8_t m_noise_counter; // noise counter
|
||
|
|
uint8_t m_noise_state; // latched noise state
|
||
|
|
uint8_t m_noise_lfo; // latched LFO noise value
|
||
|
|
uint8_t m_lfo_am; // current LFO AM value
|
||
|
|
uint8_t m_regdata[REGISTERS]; // register data
|
||
|
|
int16_t m_lfo_waveform[4][LFO_WAVEFORM_LENGTH]; // LFO waveforms; AM in low 8, PM in upper 8
|
||
|
|
uint16_t m_waveform[WAVEFORMS][WAVEFORM_LENGTH]; // waveforms
|
||
|
|
};
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
//*********************************************************
|
||
|
|
// OPM IMPLEMENTATION CLASSES
|
||
|
|
//*********************************************************
|
||
|
|
|
||
|
|
// ======================> ym2151
|
||
|
|
|
||
|
|
class ym2151
|
||
|
|
{
|
||
|
|
public:
|
||
|
|
using fm_engine = fm_engine_base<opm_registers>;
|
||
|
|
using output_data = fm_engine::output_data;
|
||
|
|
static constexpr uint32_t OUTPUTS = fm_engine::OUTPUTS;
|
||
|
|
|
||
|
|
// constructor
|
||
|
|
ym2151(ymfm_interface &intf) : ym2151(intf, VARIANT_YM2151) { }
|
||
|
|
|
||
|
|
// reset
|
||
|
|
void reset();
|
||
|
|
|
||
|
|
// save/restore
|
||
|
|
void save_restore(ymfm_saved_state &state);
|
||
|
|
|
||
|
|
// pass-through helpers
|
||
|
|
uint32_t sample_rate(uint32_t input_clock) const { return m_fm.sample_rate(input_clock); }
|
||
|
|
void invalidate_caches() { m_fm.invalidate_caches(); }
|
||
|
|
|
||
|
|
// read access
|
||
|
|
uint8_t read_status();
|
||
|
|
uint8_t read(uint32_t offset);
|
||
|
|
|
||
|
|
// write access
|
||
|
|
void write_address(uint8_t data);
|
||
|
|
void write_data(uint8_t data);
|
||
|
|
void write(uint32_t offset, uint8_t data);
|
||
|
|
|
||
|
|
// generate one sample of sound
|
||
|
|
void generate(output_data *output, uint32_t numsamples = 1);
|
||
|
|
|
||
|
|
protected:
|
||
|
|
// variants
|
||
|
|
enum opm_variant
|
||
|
|
{
|
||
|
|
VARIANT_YM2151,
|
||
|
|
VARIANT_YM2164
|
||
|
|
};
|
||
|
|
|
||
|
|
// internal constructor
|
||
|
|
ym2151(ymfm_interface &intf, opm_variant variant);
|
||
|
|
|
||
|
|
// internal state
|
||
|
|
opm_variant m_variant; // chip variant
|
||
|
|
uint8_t m_address; // address register
|
||
|
|
fm_engine m_fm; // core FM engine
|
||
|
|
};
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
//*********************************************************
|
||
|
|
// OPP IMPLEMENTATION CLASSES
|
||
|
|
//*********************************************************
|
||
|
|
|
||
|
|
// ======================> ym2164
|
||
|
|
|
||
|
|
// the YM2164 is almost 100% functionally identical to the YM2151, except
|
||
|
|
// it apparently has some mystery registers in the 00-07 range, and timer
|
||
|
|
// B's frequency is half that of the 2151
|
||
|
|
class ym2164 : public ym2151
|
||
|
|
{
|
||
|
|
public:
|
||
|
|
// constructor
|
||
|
|
ym2164(ymfm_interface &intf) : ym2151(intf, VARIANT_YM2164) { }
|
||
|
|
};
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
#endif // YMFM_OPM_H
|