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The main interface is render_samples function, which renders several samples in one call, to limit the number of calls from Go to C. This is compiled into a library, which is then linked and called from bridge.go.
120 lines
3.4 KiB
C
120 lines
3.4 KiB
C
#ifndef _SOINTU_H
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#define _SOINTU_H
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#pragma pack(push,4) // this should be fine for both Go and assembly
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typedef struct Unit {
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float State[8];
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float Ports[8];
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} Unit;
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typedef struct Voice {
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int Note;
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int Release;
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float Inputs[8];
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float Reserved[6];
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struct Unit Units[63];
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} Voice;
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typedef struct Synth {
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unsigned char Curvoices[32];
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float Left;
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float Right;
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float Aux[6];
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struct Voice Voices[32];
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} Synth;
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typedef struct DelayWorkspace {
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float Buffer[65536];
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float Dcin;
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float Dcout;
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float Filtstate;
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} DelayWorkspace;
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typedef struct SynthState {
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struct Synth Synth;
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struct DelayWorkspace Delaywrks[64]; // let's keep this as 64 for now, so the delays take 16 meg. If that's too little or too much, we can change this in future.
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unsigned char Commands[32 * 64];
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unsigned char Values[32 * 64 * 8];
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unsigned int Polyphony;
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unsigned int NumVoices;
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unsigned int RandSeed;
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unsigned int Globaltime;
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unsigned int RowTick;
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unsigned int RowLen;
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} SynthState;
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#pragma pack(pop)
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#if UINTPTR_MAX == 0xffffffff // are we 32-bit?
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#if defined(__clang__) || defined(__GNUC__)
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#define CALLCONV __attribute__ ((stdcall))
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#elif defined(_WIN32)
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#define CALLCONV __stdcall // on 32-bit platforms, we just use stdcall, as all know it
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#endif
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#else // 64-bit
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#define CALLCONV // the asm will use honor honor correct x64 ABI on all 64-bit platforms
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#endif
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#ifdef INCLUDE_GMDLS
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extern void CALLCONV su_load_gmdls(void);
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#endif
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// Returns the number of samples remaining in the buffer i.e. 0 if the buffer was
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// filled completely.
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//
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// NOTE: The buffer should have a length of 2 * maxsamples, as the audio
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// is stereo.
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//
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// You should always check if rowtick >= rowlen after calling this. If so, most
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// likely you didn't get full buffer filled but the end of row was hit before
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// filling the buffer. In that case, trigger/release new voices, set rowtick to 0.
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//
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// Beware of infinite loops: with a rowlen of 0; or without resetting rowtick
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// between rows; or with a problematic synth patch e.g. if the speed is
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// modulated to be become infinite, this function might return maxsamples i.e. not
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// render any samples. If you try to call this with your buffer until the whole
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// buffer is filled, you will be stuck in an infinite loop.
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extern int CALLCONV su_render_samples(SynthState* synthState, int maxsamples, float* buffer);
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// Arithmetic opcode ids
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extern const int su_add_id;
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extern const int su_addp_id;
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extern const int su_pop_id;
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extern const int su_loadnote_id;
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extern const int su_mul_id;
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extern const int su_mulp_id;
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extern const int su_push_id;
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extern const int su_xch_id;
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// Effect opcode ids
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extern const int su_distort_id;
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extern const int su_hold_id;
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extern const int su_crush_id;
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extern const int su_gain_id;
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extern const int su_invgain_id;
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extern const int su_filter_id;
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extern const int su_clip_id;
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extern const int su_pan_id;
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extern const int su_delay_id;
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extern const int su_compres_id;
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// Flowcontrol opcode ids
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extern const int su_advance_id;
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extern const int su_speed_id;
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// Sink opcode ids
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extern const int su_out_id;
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extern const int su_outaux_id;
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extern const int su_aux_id;
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extern const int su_send_id;
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// Source opcode ids
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extern const int su_envelope_id;
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extern const int su_noise_id;
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extern const int su_aux_id;
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extern const int su_oscillat_id;
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extern const int su_loadval_id;
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extern const int su_receive_id;
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extern const int su_in_id;
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#endif // _SOINTU_H
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