Rockboy - gameboy emulation for rockbox, based on gnuboy. Still a bit early, but already playable on iRiver H1xx and the simulators. The archos recorder version is currently rather slow...

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@6104 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 466 insertions, 0 deletions

diff --git a/apps/plugins/rockboy/sound.c b/apps/plugins/rockboy/sound.c
new file mode 100644
index 0000000000..edf31d81b7
--- /dev/null
+++ b/apps/plugins/rockboy/sound.c
@@ -0,0 +1,466 @@
+
+
+
+#include "rockmacros.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;
+int pcm_submit(void);
+
+#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(void)
+{
+    s1_freq_d(2048 - (((R_NR14&7)<<8) + R_NR13));
+}
+
+static void s2_freq(void)
+{
+    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(void)
+{
+    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(void)
+{
+    S4.freq = (freqtab[R_NR43&7] >> (R_NR43 >> 4)) * RATE;
+    if (S4.freq >> 18) S4.freq = 1<<18;
+}
+
+void sound_dirty(void)
+{
+    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(void)
+{
+    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_NR33 = 0xBF;
+    R_NR41 = 0xFF;
+    R_NR42 = 0x00;
+    R_NR43 = 0x00;
+    R_NR44 = 0xBF;
+    R_NR50 = 0x77;
+    R_NR51 = 0xF3;
+    R_NR52 = 0xF1;
+    sound_dirty();
+}
+
+void sound_reset(void)
+{
+    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();
+}
+
+
+void sound_mix(void)
+{
+    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(void)
+{
+    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(void)
+{
+    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(void)
+{
+    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(void)
+{
+    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;
+    }
+}
+
+
+
+