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sound.c
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sound.c
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#include <string.h>
#include "gnuboy.h"
#include "defs.h"
#include "pcm.h"
#include "sound.h"
#include "cpu.h"
#include "hw.h"
#include "regs.h"
#include "rc.h"
#include "noise.h"
static const byte dmgwave[16] =
{
0xac, 0xdd, 0xda, 0x48,
0x36, 0x02, 0xcf, 0x16,
0x2c, 0x04, 0xe5, 0x2c,
0xac, 0xdd, 0xda, 0x48
};
static const byte cgbwave[16] =
{
0x00, 0xff, 0x00, 0xff,
0x00, 0xff, 0x00, 0xff,
0x00, 0xff, 0x00, 0xff,
0x00, 0xff, 0x00, 0xff,
};
static const byte sqwave[4][8] =
{
{ 0, 0,-1, 0, 0, 0, 0, 0 },
{ 0,-1,-1, 0, 0, 0, 0, 0 },
{ -1,-1,-1,-1, 0, 0, 0, 0 },
{ -1, 0, 0,-1,-1,-1,-1,-1 }
};
static const int freqtab[8] =
{
(1<<14)*2,
(1<<14),
(1<<14)/2,
(1<<14)/3,
(1<<14)/4,
(1<<14)/5,
(1<<14)/6,
(1<<14)/7
};
struct snd snd;
#define RATE (snd.rate)
#define WAVE (snd.wave) /* ram.hi+0x30 */
#define S1 (snd.ch[0])
#define S2 (snd.ch[1])
#define S3 (snd.ch[2])
#define S4 (snd.ch[3])
rcvar_t sound_exports[] =
{
RCV_END
};
static void s1_freq_d(int d)
{
if (RATE > (d<<4)) S1.freq = 0;
else S1.freq = (RATE << 17)/d;
}
static void s1_freq()
{
s1_freq_d(2048 - (((R_NR14&7)<<8) + R_NR13));
}
static void s2_freq()
{
int d = 2048 - (((R_NR24&7)<<8) + R_NR23);
if (RATE > (d<<4)) S2.freq = 0;
else S2.freq = (RATE << 17)/d;
}
static void s3_freq()
{
int d = 2048 - (((R_NR34&7)<<8) + R_NR33);
if (RATE > (d<<3)) S3.freq = 0;
else S3.freq = (RATE << 21)/d;
}
static void s4_freq()
{
S4.freq = (freqtab[R_NR43&7] >> (R_NR43 >> 4)) * RATE;
if (S4.freq >> 18) S4.freq = 1<<18;
}
void sound_dirty()
{
S1.swlen = ((R_NR10>>4) & 7) << 14;
S1.len = (64-(R_NR11&63)) << 13;
S1.envol = R_NR12 >> 4;
S1.endir = (R_NR12>>3) & 1;
S1.endir |= S1.endir - 1;
S1.enlen = (R_NR12 & 7) << 15;
s1_freq();
S2.len = (64-(R_NR21&63)) << 13;
S2.envol = R_NR22 >> 4;
S2.endir = (R_NR22>>3) & 1;
S2.endir |= S2.endir - 1;
S2.enlen = (R_NR22 & 7) << 15;
s2_freq();
S3.len = (256-R_NR31) << 20;
s3_freq();
S4.len = (64-(R_NR41&63)) << 13;
S4.envol = R_NR42 >> 4;
S4.endir = (R_NR42>>3) & 1;
S4.endir |= S4.endir - 1;
S4.enlen = (R_NR42 & 7) << 15;
s4_freq();
}
void sound_off()
{
memset(&S1, 0, sizeof S1);
memset(&S2, 0, sizeof S2);
memset(&S3, 0, sizeof S3);
memset(&S4, 0, sizeof S4);
R_NR10 = 0x80;
R_NR11 = 0xBF;
R_NR12 = 0xF3;
R_NR14 = 0xBF;
R_NR21 = 0x3F;
R_NR22 = 0x00;
R_NR24 = 0xBF;
R_NR30 = 0x7F;
R_NR31 = 0xFF;
R_NR32 = 0x9F;
R_NR34 = 0xBF;
R_NR41 = 0xFF;
R_NR42 = 0x00;
R_NR43 = 0x00;
R_NR44 = 0xBF;
R_NR50 = 0x77;
R_NR51 = 0xF3;
R_NR52 = 0x70;
sound_dirty();
}
void sound_reset()
{
memset(&snd, 0, sizeof snd);
if (pcm.hz) snd.rate = (1<<21) / pcm.hz;
else snd.rate = 0;
memcpy(WAVE, hw.cgb ? cgbwave : dmgwave, 16);
memcpy(ram.hi+0x30, WAVE, 16);
sound_off();
R_NR52 = 0xF1;
}
void sound_mix()
{
int s, l, r, f, n;
if (!RATE || cpu.snd < RATE) return;
for (; cpu.snd >= RATE; cpu.snd -= RATE)
{
l = r = 0;
if (S1.on)
{
s = sqwave[R_NR11>>6][(S1.pos>>18)&7] & S1.envol;
S1.pos += S1.freq;
if ((R_NR14 & 64) && ((S1.cnt += RATE) >= S1.len))
S1.on = 0;
if (S1.enlen && (S1.encnt += RATE) >= S1.enlen)
{
S1.encnt -= S1.enlen;
S1.envol += S1.endir;
if (S1.envol < 0) S1.envol = 0;
if (S1.envol > 15) S1.envol = 15;
}
if (S1.swlen && (S1.swcnt += RATE) >= S1.swlen)
{
S1.swcnt -= S1.swlen;
f = S1.swfreq;
n = (R_NR10 & 7);
if (R_NR10 & 8) f -= (f >> n);
else f += (f >> n);
if (f > 2047)
S1.on = 0;
else
{
S1.swfreq = f;
R_NR13 = f;
R_NR14 = (R_NR14 & 0xF8) | (f>>8);
s1_freq_d(2048 - f);
}
}
s <<= 2;
if (R_NR51 & 1) r += s;
if (R_NR51 & 16) l += s;
}
if (S2.on)
{
s = sqwave[R_NR21>>6][(S2.pos>>18)&7] & S2.envol;
S2.pos += S2.freq;
if ((R_NR24 & 64) && ((S2.cnt += RATE) >= S2.len))
S2.on = 0;
if (S2.enlen && (S2.encnt += RATE) >= S2.enlen)
{
S2.encnt -= S2.enlen;
S2.envol += S2.endir;
if (S2.envol < 0) S2.envol = 0;
if (S2.envol > 15) S2.envol = 15;
}
s <<= 2;
if (R_NR51 & 2) r += s;
if (R_NR51 & 32) l += s;
}
if (S3.on)
{
s = WAVE[(S3.pos>>22) & 15];
if (S3.pos & (1<<21)) s &= 15;
else s >>= 4;
s -= 8;
S3.pos += S3.freq;
if ((R_NR34 & 64) && ((S3.cnt += RATE) >= S3.len))
S3.on = 0;
if (R_NR32 & 96) s <<= (3 - ((R_NR32>>5)&3));
else s = 0;
if (R_NR51 & 4) r += s;
if (R_NR51 & 64) l += s;
}
if (S4.on)
{
if (R_NR43 & 8) s = 1 & (noise7[
(S4.pos>>20)&15] >> (7-((S4.pos>>17)&7)));
else s = 1 & (noise15[
(S4.pos>>20)&4095] >> (7-((S4.pos>>17)&7)));
s = (-s) & S4.envol;
S4.pos += S4.freq;
if ((R_NR44 & 64) && ((S4.cnt += RATE) >= S4.len))
S4.on = 0;
if (S4.enlen && (S4.encnt += RATE) >= S4.enlen)
{
S4.encnt -= S4.enlen;
S4.envol += S4.endir;
if (S4.envol < 0) S4.envol = 0;
if (S4.envol > 15) S4.envol = 15;
}
s += s << 1;
if (R_NR51 & 8) r += s;
if (R_NR51 & 128) l += s;
}
l *= (R_NR50 & 0x07);
r *= ((R_NR50 & 0x70)>>4);
l >>= 4;
r >>= 4;
if (l > 127) l = 127;
else if (l < -128) l = -128;
if (r > 127) r = 127;
else if (r < -128) r = -128;
if (pcm.buf)
{
if (pcm.pos >= pcm.len)
pcm_submit();
if (pcm.stereo)
{
pcm.buf[pcm.pos++] = l+128;
pcm.buf[pcm.pos++] = r+128;
}
else pcm.buf[pcm.pos++] = ((l+r)>>1)+128;
}
}
R_NR52 = (R_NR52&0xf0) | S1.on | (S2.on<<1) | (S3.on<<2) | (S4.on<<3);
}
byte sound_read(byte r)
{
sound_mix();
/* printf("read %02X: %02X\n", r, REG(r)); */
return REG(r);
}
void s1_init()
{
S1.swcnt = 0;
S1.swfreq = ((R_NR14&7)<<8) + R_NR13;
S1.envol = R_NR12 >> 4;
S1.endir = (R_NR12>>3) & 1;
S1.endir |= S1.endir - 1;
S1.enlen = (R_NR12 & 7) << 15;
if (!S1.on) S1.pos = 0;
S1.on = 1;
S1.cnt = 0;
S1.encnt = 0;
}
void s2_init()
{
S2.envol = R_NR22 >> 4;
S2.endir = (R_NR22>>3) & 1;
S2.endir |= S2.endir - 1;
S2.enlen = (R_NR22 & 7) << 15;
if (!S2.on) S2.pos = 0;
S2.on = 1;
S2.cnt = 0;
S2.encnt = 0;
}
void s3_init()
{
int i;
if (!S3.on) S3.pos = 0;
S3.cnt = 0;
S3.on = R_NR30 >> 7;
if (S3.on) for (i = 0; i < 16; i++)
ram.hi[i+0x30] = 0x13 ^ ram.hi[i+0x31];
}
void s4_init()
{
S4.envol = R_NR42 >> 4;
S4.endir = (R_NR42>>3) & 1;
S4.endir |= S4.endir - 1;
S4.enlen = (R_NR42 & 7) << 15;
S4.on = 1;
S4.pos = 0;
S4.cnt = 0;
S4.encnt = 0;
}
void sound_write(byte r, byte b)
{
#if 0
static void *timer;
if (!timer) timer = sys_timer();
printf("write %02X: %02X @ %d\n", r, b, sys_elapsed(timer));
#endif
if (!(R_NR52 & 128) && r != RI_NR52) return;
if ((r & 0xF0) == 0x30)
{
if (S3.on) sound_mix();
if (!S3.on)
WAVE[r-0x30] = ram.hi[r] = b;
return;
}
sound_mix();
switch (r)
{
case RI_NR10:
R_NR10 = b;
S1.swlen = ((R_NR10>>4) & 7) << 14;
S1.swfreq = ((R_NR14&7)<<8) + R_NR13;
break;
case RI_NR11:
R_NR11 = b;
S1.len = (64-(R_NR11&63)) << 13;
break;
case RI_NR12:
R_NR12 = b;
S1.envol = R_NR12 >> 4;
S1.endir = (R_NR12>>3) & 1;
S1.endir |= S1.endir - 1;
S1.enlen = (R_NR12 & 7) << 15;
break;
case RI_NR13:
R_NR13 = b;
s1_freq();
break;
case RI_NR14:
R_NR14 = b;
s1_freq();
if (b & 128) s1_init();
break;
case RI_NR21:
R_NR21 = b;
S2.len = (64-(R_NR21&63)) << 13;
break;
case RI_NR22:
R_NR22 = b;
S2.envol = R_NR22 >> 4;
S2.endir = (R_NR22>>3) & 1;
S2.endir |= S2.endir - 1;
S2.enlen = (R_NR22 & 7) << 15;
break;
case RI_NR23:
R_NR23 = b;
s2_freq();
break;
case RI_NR24:
R_NR24 = b;
s2_freq();
if (b & 128) s2_init();
break;
case RI_NR30:
R_NR30 = b;
if (!(b & 128)) S3.on = 0;
break;
case RI_NR31:
R_NR31 = b;
S3.len = (256-R_NR31) << 13;
break;
case RI_NR32:
R_NR32 = b;
break;
case RI_NR33:
R_NR33 = b;
s3_freq();
break;
case RI_NR34:
R_NR34 = b;
s3_freq();
if (b & 128) s3_init();
break;
case RI_NR41:
R_NR41 = b;
S4.len = (64-(R_NR41&63)) << 13;
break;
case RI_NR42:
R_NR42 = b;
S4.envol = R_NR42 >> 4;
S4.endir = (R_NR42>>3) & 1;
S4.endir |= S4.endir - 1;
S4.enlen = (R_NR42 & 7) << 15;
break;
case RI_NR43:
R_NR43 = b;
s4_freq();
break;
case RI_NR44:
R_NR44 = b;
if (b & 128) s4_init();
break;
case RI_NR50:
R_NR50 = b;
break;
case RI_NR51:
R_NR51 = b;
break;
case RI_NR52:
R_NR52 = b;
if (!(R_NR52 & 128))
sound_off();
break;
default:
return;
}
}