#ifndef AUDIO_SYNTHESIS_H
#define AUDIO_SYNTHESIS_H

#include "internal.h"

#define DEFAULT_LEN_1CH 0x140
#define DEFAULT_LEN_2CH 0x280

#define MAX_UPDATES_PER_FRAME 4

struct ReverbRingBufferItem {
    s16 numSamplesAfterDownsampling;
    s16 chunkLen; // never read
    s16 *toDownsampleLeft;
    s16 *toDownsampleRight; // data pointed to by left and right are adjacent in memory
    s32 startPos; // start pos in ring buffer
    s16 lengthA; // first length in ring buffer (from startPos, at most until end)
    s16 lengthB; // second length in ring buffer (from pos 0)
}; // size = 0x14

struct SynthesisReverb {
    /*0x00, 0x00, 0x00*/ u8 resampleFlags;
    /*0x01, 0x01, 0x01*/ u8 useReverb;
    /*0x02, 0x02, 0x02*/ u8 framesLeftToIgnore;
    /*0x03, 0x03, 0x03*/ u8 curFrame;
    /*0x04, 0x08, 0x0A*/ u16 reverbGain;
    /*0x06, 0x0A, 0x0C*/ u16 resampleRate;
    /*0x08, 0x0C, 0x14*/ s32 nextRingBufferPos;
    /*0x0C, 0x10, 0x18*/ s32 unkC; // never read
    /*0x10, 0x14, 0x1C*/ s32 bufSizePerChannel;
    struct {
        s16 *left;
        s16 *right;
    } ringBuffer;
    /*0x1C, 0x20, 0x28*/ s16 *resampleStateLeft;
    /*0x20, 0x24, 0x2C*/ s16 *resampleStateRight;
    /*0x24, 0x28, 0x30*/ s16 *unk24; // never read
    /*0x28, 0x2C, 0x34*/ s16 *unk28; // never read
    /*0x2C, 0x30, 0x38*/ struct ReverbRingBufferItem items[2][MAX_UPDATES_PER_FRAME];
}; // 0xCC <= size <= 0x100
extern struct SynthesisReverb gSynthesisReverb;

u64 *synthesis_execute(u64 *cmdBuf, s32 *writtenCmds, s16 *aiBuf, s32 bufLen);
void note_init_volume(struct Note *note);
void note_set_vel_pan_reverb(struct Note *note, f32 velocity, f32 pan, u8 reverbVol);
void note_set_frequency(struct Note *note, f32 frequency);
void note_enable(struct Note *note);
void note_disable(struct Note *note);

#endif // AUDIO_SYNTHESIS_H
