Mercurial > repos > blastem
view ym2612.h @ 1925:039553703c20
Don't apply address and cd register changes to the 'live' registers until pending flag is cleared, but do preserve the upper address bits in the latch. Fixes regression in Overdrive 2 while preserving fix to Mona in 344 bytes
author | Michael Pavone <pavone@retrodev.com> |
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date | Mon, 13 Apr 2020 20:43:25 -0700 |
parents | 508522f08e4d |
children | 0d1d5dccdd28 |
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/* Copyright 2013 Michael Pavone This file is part of BlastEm. BlastEm is free software distributed under the terms of the GNU General Public License version 3 or greater. See COPYING for full license text. */ #ifndef YM2612_H_ #define YM2612_H_ #include <stdint.h> #include <stdio.h> #include "serialize.h" #include "render_audio.h" #include "vgm.h" #define NUM_PART_REGS (0xB7-0x30) #define NUM_CHANNELS 6 #define NUM_OPERATORS (4*NUM_CHANNELS) #define YM_OPT_WAVE_LOG 1 #define YM_OPT_3834 2 typedef struct { int16_t *mod_src[2]; uint32_t phase_counter; uint32_t phase_inc; uint16_t envelope; int16_t output; uint16_t total_level; uint16_t sustain_level; uint8_t rates[4]; uint8_t key_scaling; uint8_t multiple; uint8_t detune; uint8_t am; uint8_t env_phase; uint8_t ssg; uint8_t inverted; } ym_operator; typedef struct { FILE * logfile; uint16_t fnum; int16_t output; int16_t op1_old; int16_t op2_old; uint8_t block_fnum_latch; uint8_t block; uint8_t keycode; uint8_t algorithm; uint8_t feedback; uint8_t ams; uint8_t pms; uint8_t lr; uint8_t keyon; } ym_channel; typedef struct { uint16_t fnum; uint8_t block; uint8_t block_fnum_latch; uint8_t keycode; } ym_supp; #define YM_PART1_START 0x21 #define YM_PART2_START 0x30 #define YM_REG_END 0xB8 #define YM_PART1_REGS (YM_REG_END-YM_PART1_START) #define YM_PART2_REGS (YM_REG_END-YM_PART2_START) typedef struct { audio_source *audio; vgm_writer *vgm; uint32_t clock_inc; uint32_t current_cycle; uint32_t write_cycle; uint32_t busy_start; uint32_t busy_cycles; uint32_t last_status_cycle; uint32_t invalid_status_decay; uint32_t status_address_mask; int32_t volume_mult; int32_t volume_div; ym_operator operators[NUM_OPERATORS]; ym_channel channels[NUM_CHANNELS]; int16_t zero_offset; uint16_t timer_a; uint16_t timer_a_load; uint16_t env_counter; ym_supp ch3_supp[3]; uint8_t timer_b; uint8_t sub_timer_b; uint8_t timer_b_load; uint8_t ch3_mode; uint8_t current_op; uint8_t current_env_op; uint8_t timer_control; uint8_t dac_enable; uint8_t lfo_enable; uint8_t lfo_freq; uint8_t lfo_counter; uint8_t lfo_am_step; uint8_t lfo_pm_step; uint8_t csm_keyon; uint8_t status; uint8_t last_status; uint8_t selected_reg; uint8_t selected_part; uint8_t part1_regs[YM_PART1_REGS]; uint8_t part2_regs[YM_PART2_REGS]; } ym2612_context; enum { REG_LFO = 0x22, REG_TIMERA_HIGH = 0x24, REG_TIMERA_LOW, REG_TIMERB, REG_TIME_CTRL, REG_KEY_ONOFF, REG_DAC = 0x2A, REG_DAC_ENABLE, REG_DETUNE_MULT = 0x30, REG_TOTAL_LEVEL = 0x40, REG_ATTACK_KS = 0x50, REG_DECAY_AM = 0x60, REG_SUSTAIN_RATE = 0x70, REG_S_LVL_R_RATE = 0x80, REG_SSG_EG = 0x90, REG_FNUM_LOW = 0xA0, REG_BLOCK_FNUM_H = 0xA4, REG_FNUM_LOW_CH3 = 0xA8, REG_BLOCK_FN_CH3 = 0xAC, REG_ALG_FEEDBACK = 0xB0, REG_LR_AMS_PMS = 0xB4 }; void ym_init(ym2612_context * context, uint32_t master_clock, uint32_t clock_div, uint32_t options); void ym_reset(ym2612_context *context); void ym_free(ym2612_context *context); void ym_enable_zero_offset(ym2612_context *context, uint8_t enabled); void ym_adjust_master_clock(ym2612_context * context, uint32_t master_clock); void ym_adjust_cycles(ym2612_context *context, uint32_t deduction); void ym_run(ym2612_context * context, uint32_t to_cycle); void ym_address_write_part1(ym2612_context * context, uint8_t address); void ym_address_write_part2(ym2612_context * context, uint8_t address); void ym_data_write(ym2612_context * context, uint8_t value); void ym_vgm_log(ym2612_context *context, uint32_t master_clock, vgm_writer *vgm); uint8_t ym_read_status(ym2612_context * context, uint32_t cycle, uint32_t port); uint8_t ym_load_gst(ym2612_context * context, FILE * gstfile); uint8_t ym_save_gst(ym2612_context * context, FILE * gstfile); void ym_print_channel_info(ym2612_context *context, int channel); void ym_print_timer_info(ym2612_context *context); void ym_serialize(ym2612_context *context, serialize_buffer *buf); void ym_deserialize(deserialize_buffer *buf, void *vcontext); #endif //YM2612_H_