117 lines
3.1 KiB
C++
117 lines
3.1 KiB
C++
#include <stdio.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <malloc.h>
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#include <Windows.h>
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#include <MMSystem.h>
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int notes[25] = { 134, 142, 150, 159, 169, 179, 189, 201, 213, 225, 239, 253, 268, 284, 301, 319, 338, 358, 379, 401, 425, 451, 477, 506, 536 };
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int arpeggio[][4] = {
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{ 0, 3, 7, 12 },
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{ 2, 5, 7, 10 },
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{ 1, 5, 7, 10 },
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{ 1, 3, 5, 8 },
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{ 1, 3, 5, 10 },
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};
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int arpseq[16] = { 0, 0, 1, 1, 2, 2, 4, 3, 0, 0, 1, 1, 2, 3, 4, 4 };
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int bassbeat[8] = { 0, 0, 1, 0, 0, 1, 0, 1 };
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int bassline[16] = { 12, 12, 15, 10, 12, 12, 17, 10, 12, 12, 15, 7, 8, 8, 3, 7 };
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#define LEADSIZE 28
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int leadmelody[LEADSIZE] = { 12, 7, 0, 12, 0, 14, 15, 0, 14, 0, 12, 0, 14, 15, 0, 14, 0, 12, 0, 14, 10, 0, 7, 5, 7, 3, 1, 0 };
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int leadtiming[LEADSIZE] = { 2, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 2, 1, 2, 2, 1, 2, 3, 28};
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static inline unsigned char voice_lead(unsigned long i)
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{
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static uint8_t leadptr = 0xFF;
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static uint16_t lead_osc = 0;
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static uint16_t lead_flange = 0;
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static uint8_t leadtimer = 1;
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if (0 == (i & 0x3FF))
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leadtimer--;
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if (0 == leadtimer)
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{
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leadptr++;
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if (leadptr == LEADSIZE)
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leadptr = 0;
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leadtimer = leadtiming[leadptr];
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}
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uint8_t melody = leadmelody[leadptr];
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int note = notes[melody == 1 ? 0 : melody]; // TODO remove this hack by using note table
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lead_osc += note;
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lead_flange += note + 1;//(i & 1);
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return (!melody) ? 0 : (((lead_osc >> 6) & 0x7F) + ((lead_flange >> 6) & 0x3F)); // xor also sounds cool
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}
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static inline unsigned char voice_arp(unsigned long i)
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{
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static uint16_t arp_osc = 0;
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int note = notes[12 + arpeggio[arpseq[(i >> 13) & 15]][(i >> 7) & 3]];
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arp_osc += note;
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return ((arp_osc >> 5) & 128) - 1;
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}
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static inline unsigned char voice_bass(unsigned long i)
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{
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static uint16_t bassosc = 0, flangeosc = 0;
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int note = notes[bassline[(i >> 13) & 15]];
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if (bassbeat[(i >> 10) & 7])
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note <<= 1;
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bassosc += note;
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flangeosc += note + 1;
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unsigned char ret = ((bassosc >> 8) & 0x7F) + ((flangeosc >> 8) & 0x7F);
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return ((i >> 6) & 0xF) == 0xF ? 0 : ret;
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}
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void fill(char *data)
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{
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static unsigned long i = 0;
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for (int j = 0; j < 4096; j++)
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{
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unsigned char sample = (voice_lead(i) >> 1) + (voice_bass(i) >> 1);// + (voice_arp(i) >> 1);
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data[j] = sample;
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i++;
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}
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}
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static const WAVEFORMATEX fmt = {
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WAVE_FORMAT_PCM, 1, 8000, 8000, 1, 8, 0
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};
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int main(int argc, char *argv[])
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{
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HWAVEOUT out;
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HRESULT rc = waveOutOpen(&out, WAVE_MAPPER, &fmt, NULL, NULL, CALLBACK_NULL);
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if (rc != MMSYSERR_NOERROR)
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{
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printf("error %d on open\n");
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exit(1);
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}
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WAVEHDR bufs[2] = {
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{ (char *)malloc(4096), 4096 },
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{ (char *)malloc(4096), 4096 },
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};
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int i = 0;
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fill(bufs[i].lpData);
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bufs[i].dwFlags = WHDR_PREPARED;
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waveOutPrepareHeader(out, bufs + i, sizeof(WAVEHDR));
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waveOutWrite(out, bufs + i, sizeof(WAVEHDR));
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i ^= 1;
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while (!(GetAsyncKeyState(VK_ESCAPE) & 1))
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{
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fill(bufs[i].lpData);
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bufs[i].dwFlags = WHDR_PREPARED;
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waveOutPrepareHeader(out, bufs + i, sizeof(WAVEHDR));
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waveOutWrite(out, bufs + i, sizeof(WAVEHDR));
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i ^= 1;
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while (waveOutUnprepareHeader(out, bufs + i, sizeof(WAVEHDR)) == WAVERR_STILLPLAYING);
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}
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} |