87 lines
1.5 KiB
C
87 lines
1.5 KiB
C
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#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_NUM_REGISTERS 256
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#define SID3_MAX_VOL 255
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#define SID3_WAVETABLE_LENGTH 512
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typedef struct
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{
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int input;
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int 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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} 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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uint32_t connection_matrix;
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} sid3_filters_block;
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typedef struct
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{
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uint32_t accumulator;
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uint32_t frequency;
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sid3_filters_block filt;
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uint8_t panning;
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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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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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sid3_filters_block filt;
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uint8_t panning;
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} sid3_wavetable_chan;
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typedef struct
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{
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sid3_channel chan[SID3_NUM_CHANNELS - 1];
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sid3_wavetable_chan wave_chan;
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int output_l, output_r;
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//emulation-only helpers
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int channel_output[SID3_NUM_CHANNELS];
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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, uint8_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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