269 lines
6.4 KiB
C
269 lines
6.4 KiB
C
#ifndef SID3_H
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#define SID3_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdbool.h>
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#define SID3_NUM_CHANNELS 7
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#define SID3_NUM_FILTERS 4
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#define SID3_REGISTERS_PER_CHANNEL 64
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#define SID3_REGISTERS_PER_FILTER 8
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#define SID3_NUM_REGISTERS (SID3_NUM_CHANNELS * SID3_REGISTERS_PER_CHANNEL)
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#define SID3_MAX_VOL 255
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#define SID3_WAVETABLE_LENGTH 256
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#define SID3_NUM_WAVEFORM_BITS 5
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#define SID3_NUM_UNIQUE_SPECIAL_WAVES 28
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#define SID3_NUM_SPECIAL_WAVES (SID3_NUM_UNIQUE_SPECIAL_WAVES * 2 + 2) /* usual and 2x vol clipped + 2x vol clipped tri and saw... */
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#define SID3_SPECIAL_WAVE_LENGTH 16384
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#define SID3_EXPONENTIAL_LUT_LENGTH ((0xff0000 >> 8) + 1)
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#define SID3_ACC_BITS 30
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#define SID3_ACC_MASK ((1UL << SID3_ACC_BITS) - 1)
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enum Flags
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{
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SID3_CHAN_ENABLE_GATE = 1,
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SID3_CHAN_ENABLE_RING_MOD = 2,
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SID3_CHAN_ENABLE_HARD_SYNC = 4,
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SID3_CHAN_ENABLE_PHASE_MOD = 8,
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SID3_CHAN_PHASE_RESET = 16,
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SID3_CHAN_ENV_RESET = 32,
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SID3_CHAN_NOISE_PHASE_RESET = 64,
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SID3_CHAN_1_BIT_NOISE = 128,
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};
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enum Waveforms
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{
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SID3_WAVE_TRIANGLE = 1,
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SID3_WAVE_SAW = 2,
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SID3_WAVE_PULSE = 4,
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SID3_WAVE_NOISE = 8,
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SID3_WAVE_SPECIAL = 16,
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};
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enum Mixmodes
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{
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SID3_MIX_8580 = 0,
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SID3_MIX_AND = 1,
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SID3_MIX_OR = 2,
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SID3_MIX_XOR = 3,
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SID3_MIX_SUM = 4,
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};
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enum Filter_modes
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{
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SID3_FILTER_LP = 1,
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SID3_FILTER_HP = 2,
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SID3_FILTER_BP = 4,
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SID3_FILTER_MODES_MASK = 7,
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SID3_FILTER_ENABLE = 8,
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SID3_FILTER_CHANNEL_INPUT = 16, //add channel input to filter input
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SID3_FILTER_OUTPUT = 32, //output sound from this filter to channel output
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};
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enum Registers
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{
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SID3_REGISTER_FLAGS = 0,
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SID3_REGISTER_ADSR_A = 1,
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SID3_REGISTER_ADSR_D = 2,
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SID3_REGISTER_ADSR_S = 3,
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SID3_REGISTER_ADSR_SR = 4,
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SID3_REGISTER_ADSR_R = 5,
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SID3_REGISTER_WAVEFORM = 6,
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SID3_REGISTER_PW_HIGH = 7,
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SID3_REGISTER_PW_LOW = 8,
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SID3_REGISTER_SPECIAL_WAVE = 9,
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SID3_REGISTER_FREQ_HIGH = 10,
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SID3_REGISTER_FREQ_MID = 11,
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SID3_REGISTER_FREQ_LOW = 12,
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SID3_REGISTER_ADSR_VOL = 13,
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SID3_REGISTER_MIXMODE = 14,
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SID3_REGISTER_RING_MOD_SRC = 15,
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SID3_REGISTER_SYNC_SRC = 16,
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SID3_REGISTER_FILT_BASE = 17,
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SID3_REGISTER_FILT_MODE = 17,
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SID3_REGISTER_FILT_CUTOFF_HIGH = 18,
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SID3_REGISTER_FILT_CUTOFF_LOW = 19,
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SID3_REGISTER_FILT_RESONANCE = 20,
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SID3_REGISTER_FILT_DISTORTION = 21,
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SID3_REGISTER_FILT_CONNECTION = 22,
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SID3_REGISTER_FILT_OUTPUT_VOLUME = 23,
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SID3_REGISTER_AFTER_FILT_1ST_REG = SID3_REGISTER_FILT_BASE + SID3_REGISTERS_PER_FILTER * SID3_NUM_FILTERS,
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SID3_REGISTER_PHASE_MOD_SRC = SID3_REGISTER_AFTER_FILT_1ST_REG,
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SID3_REGISTER_PAN_LEFT = SID3_REGISTER_AFTER_FILT_1ST_REG + 1,
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SID3_REGISTER_PAN_RIGHT = SID3_REGISTER_AFTER_FILT_1ST_REG + 2,
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SID3_REGISTER_NOISE_FREQ_HIGH = SID3_REGISTER_AFTER_FILT_1ST_REG + 3,
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SID3_REGISTER_NOISE_FREQ_MID = SID3_REGISTER_AFTER_FILT_1ST_REG + 4,
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SID3_REGISTER_NOISE_FREQ_LOW = SID3_REGISTER_AFTER_FILT_1ST_REG + 5,
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SID3_REGISTER_NOISE_LFSR_HIGHEST = SID3_REGISTER_AFTER_FILT_1ST_REG + 6,
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SID3_REGISTER_NOISE_LFSR_HIGH = SID3_REGISTER_AFTER_FILT_1ST_REG + 7,
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SID3_REGISTER_NOISE_LFSR_MID = SID3_REGISTER_AFTER_FILT_1ST_REG + 8,
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SID3_REGISTER_NOISE_LFSR_LOW = SID3_REGISTER_AFTER_FILT_1ST_REG + 9,
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SID3_REGISTER_STREAMED_SAMPLE_HIGH = SID3_REGISTER_AFTER_FILT_1ST_REG + 10,
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SID3_REGISTER_STREAMED_SAMPLE_LOW = SID3_REGISTER_AFTER_FILT_1ST_REG + 11,
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};
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typedef struct
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{
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int32_t input;
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int32_t output;
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// State of filter.
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float Vhp; // highpass
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float Vbp; // bandpass
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float Vlp; // lowpass
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// Cutoff frequency, resonance.
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float w0, w0_ceil_1;
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float _1024_div_Q;
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double distortion_multiplier; //pre-calculated distortion multiplier for tanh() simple distortion
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double tanh_distortion_multiplier; //pre-calculated tanh(distortion multiplier)
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uint16_t cutoff;
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uint8_t resonance;
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uint8_t distortion_level;
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uint8_t mode;
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uint8_t output_volume;
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} sid3_filter;
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typedef struct
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{
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sid3_filter filt[SID3_NUM_FILTERS];
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uint8_t connection_matrix[SID3_NUM_FILTERS];
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} sid3_filters_block;
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typedef struct
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{
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uint8_t a, d, s, sr, r, vol, state;
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uint32_t envelope_counter;
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uint32_t envelope_speed;
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bool hold_zero;
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} sid3_channel_adsr;
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typedef struct
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{
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uint32_t accumulator;
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uint8_t sync_bit;
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uint32_t frequency;
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uint32_t noise_accumulator;
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uint32_t noise_frequency;
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uint32_t lfsr, lfsr_taps;
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uint8_t waveform;
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uint8_t special_wave;
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uint16_t pw;
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uint8_t mix_mode;
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sid3_channel_adsr adsr;
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uint8_t flags;
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uint8_t ring_mod_src;
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uint8_t hard_sync_src;
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uint8_t phase_mod_source;
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sid3_filters_block filt;
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uint8_t clock_filter;
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uint8_t panning_left, panning_right;
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bool invert_left, invert_right; //invert channel signal
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int32_t output_before_filter;
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} sid3_channel;
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typedef struct
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{
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uint32_t accumulator;
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uint8_t sync_bit;
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uint32_t frequency;
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uint16_t streamed_sample;
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uint8_t wavetable[SID3_WAVETABLE_LENGTH];
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uint8_t wave_address;
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sid3_channel_adsr adsr;
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uint8_t flags;
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uint8_t mode;
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uint8_t ring_mod_src;
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uint8_t hard_sync_src;
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uint8_t phase_mod_source;
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sid3_filters_block filt;
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uint8_t clock_filter;
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uint8_t panning_left, panning_right;
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bool invert_left, invert_right; //invert channel signal
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int32_t output_before_filter;
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} sid3_wavetable_chan;
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typedef struct
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{
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uint16_t special_waves[SID3_NUM_SPECIAL_WAVES][SID3_SPECIAL_WAVE_LENGTH]; //sine wave and OPL3-ish waves + OPZ and YMF825 waves!
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uint16_t env_counter_to_exponential_output[SID3_EXPONENTIAL_LUT_LENGTH];
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uint32_t exponential_output_to_envelope_counter[SID3_EXPONENTIAL_LUT_LENGTH];
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sid3_channel chan[SID3_NUM_CHANNELS - 1];
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sid3_wavetable_chan wave_chan;
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int32_t output_l, output_r;
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int32_t channel_signals_before_ADSR[SID3_NUM_CHANNELS];
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int32_t channel_output[SID3_NUM_CHANNELS];
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int32_t wave_channel_signal_before_ADSR;
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int32_t wave_channel_output;
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//emulation-only helpers
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bool muted[SID3_NUM_CHANNELS];
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} SID3;
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SID3* sid3_create();
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void sid3_reset(SID3* sid3);
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void sid3_write(SID3* sid3, uint16_t address, uint8_t data);
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void sid3_clock(SID3* sid3);
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void sid3_set_is_muted(SID3* sid3, uint8_t ch, bool mute);
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void sid3_free(SID3* sid3);
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#ifdef __cplusplus
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};
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#endif
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#endif
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