47 lines
1.1 KiB
C
47 lines
1.1 KiB
C
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/*
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Copyright (c) 2021 Devine Lu Linvega
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Copyright (c) 2021 Andrew Alderwick
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Permission to use, copy, modify, and distribute this software for any
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purpose with or without fee is hereby granted, provided that the above
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copyright notice and this permission notice appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE.
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*/
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typedef unsigned char Uint8;
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typedef signed char Sint8;
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typedef unsigned short Uint16;
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typedef signed short Sint16;
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typedef unsigned int Uint32;
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typedef signed int Sint32;
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#define SAMPLE_FREQUENCY 48000
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typedef struct {
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Uint16 *dat;
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Uint8 i, n, sz, finishes;
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} Queue;
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typedef struct {
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Uint32 count, advance, period;
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Uint16 vector;
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Sint16 start_value, end_value;
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Queue queue;
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} WaveformGenerator;
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typedef struct {
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WaveformGenerator wv[2];
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Sint8 volume[2], playing;
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} Note;
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typedef struct {
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Queue *queue;
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Note *notes;
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int n_notes;
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} Apu;
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void apu_render(Apu *apu, Uxn *u, Sint16 *samples, int n_samples);
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void apu_play_note(Note *note, Uint16 wave_vector, Uint16 envelope_vector, Uint8 volume, Uint8 pitch);
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