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https://github.com/vsariola/sointu.git
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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.
46 lines
1.7 KiB
C
46 lines
1.7 KiB
C
#include <stdint.h>
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#include <stdlib.h>
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#include "../include/sointu.h"
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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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#define BPM 100
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#define SAMPLE_RATE 44100
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#define TOTAL_ROWS 16
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#define SAMPLES_PER_ROW SAMPLE_RATE * 4 * 60 / (BPM * 16)
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const int su_max_samples = SAMPLES_PER_ROW * TOTAL_ROWS;
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void CALLCONV su_render(float* buffer) {
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SynthState* synthState;
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const unsigned char commands[] = { su_envelope_id, // MONO
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su_envelope_id, // MONO
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su_out_id + 1, // STEREO
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su_advance_id };// MONO
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const unsigned char values[] = { 64, 64, 64, 80, 128, // envelope 1
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95, 64, 64, 80, 128, // envelope 2
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128};
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int retval;
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synthState = malloc(sizeof(SynthState));
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memset(synthState, 0, sizeof(SynthState));
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memcpy(synthState->Commands, commands, sizeof(commands));
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memcpy(synthState->Values, values, sizeof(values));
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synthState->RandSeed = 1;
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synthState->RowLen = INT32_MAX;
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synthState->NumVoices = 1;
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synthState->Synth.Voices[0].Note = 64;
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retval = su_render_samples(synthState, su_max_samples / 2, buffer);
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synthState->Synth.Voices[0].Release++;
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buffer = buffer + su_max_samples;
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retval = su_render_samples(synthState, su_max_samples / 2, buffer);
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free(synthState);
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return;
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}
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