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https://github.com/holub/mame
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k054539: Uncross the streams [O. Galibert]
This commit is contained in:
Olivier Galibert
parent
4e3ac4fb9d
commit
347ff9bce4
@ -69,11 +69,7 @@ void k054539_device::static_set_interface(device_t &device, const k054539_interf
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22f: enable pcm (b0), disable register ram updating (b7)
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The chip has a 0x4000 bytes reverb buffer (the ram from 0x22e).
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The reverb delay is actually an offset in this buffer. This driver
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uses some tricks (doubling the buffer size so that the longest
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reverbs don't fold over the sound to output, and adding a space at
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the end to fold back overflows in) to be able to do frame-based
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rendering instead of sample-based.
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The reverb delay is actually an offset in this buffer.
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*/
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void k054539_device::init_flags(int _flags)
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@ -115,15 +111,18 @@ void k054539_device::sound_stream_update(sound_stream &stream, stream_sample_t *
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};
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int cur_reverb_pos = reverb_pos;
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INT16 *rbase = (INT16 *)ram;
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memset(outputs[0], 0, samples*sizeof(*outputs[0]));
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memset(outputs[1], 0, samples*sizeof(*outputs[1]));
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if(!(regs[0x22f] & 1))
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return;
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if(!(regs[0x22f] & 1)) return;
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reverb_pos = (reverb_pos + samples) & 0x3fff;
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for(int sample = 0; sample != samples; sample++) {
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double lval, rval;
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if(!(flags & DISABLE_REVERB))
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lval = rval = rbase[reverb_pos];
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else
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lval = rval = 0;
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rbase[reverb_pos] = 0;
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for(int ch=0; ch<8; ch++)
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if(regs[0x22c] & (1<<ch)) {
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@ -136,34 +135,37 @@ void k054539_device::sound_stream_update(sound_stream &stream, stream_sample_t *
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int vol = base1[0x03];
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int bval = vol + base1[0x04];
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if (bval > 255) bval = 255;
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if (bval > 255)
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bval = 255;
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int pan = base1[0x05];
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// DJ Main: 81-87 right, 88 middle, 89-8f left
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if (pan >= 0x81 && pan <= 0x8f)
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pan -= 0x81;
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else if (pan >= 0x11 && pan <= 0x1f)
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pan -= 0x11;
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else
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if (pan >= 0x11 && pan <= 0x1f) pan -= 0x11; else pan = 0x18 - 0x11;
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pan = 0x18 - 0x11;
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double cur_gain = gain[ch];
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double lvol = voltab[vol] * pantab[pan] * cur_gain;
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if (lvol > VOL_CAP) lvol = VOL_CAP;
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if (lvol > VOL_CAP)
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lvol = VOL_CAP;
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double rvol = voltab[vol] * pantab[0xe - pan] * cur_gain;
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if (rvol > VOL_CAP) rvol = VOL_CAP;
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if (rvol > VOL_CAP)
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rvol = VOL_CAP;
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double rbvol= voltab[bval] * cur_gain / 2;
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if (rbvol > VOL_CAP) rbvol = VOL_CAP;
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if (rbvol > VOL_CAP)
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rbvol = VOL_CAP;
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int rdelta = (base1[6] | (base1[7] << 8)) >> 3;
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rdelta = (rdelta + cur_reverb_pos) & 0x3fff;
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rdelta = (rdelta + reverb_pos) & 0x3fff;
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int cur_pos = (base1[0x0c] | (base1[0x0d] << 8) | (base1[0x0e] << 16)) & rom_mask;
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stream_sample_t *bufl = outputs[0];
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stream_sample_t *bufr = outputs[1];
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int fdelta, pdelta;
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if(base2[0] & 0x20) {
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delta = -delta;
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@ -186,17 +188,8 @@ void k054539_device::sound_stream_update(sound_stream &stream, stream_sample_t *
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cur_pval = chan->pval;
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}
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#define UPDATE_CHANNELS \
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do { \
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*bufl++ += (INT16)(cur_val*lvol); \
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*bufr++ += (INT16)(cur_val*rvol); \
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rbase[rdelta++] += (INT16)(cur_val*rbvol); \
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rdelta &= 0x3fff; \
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} while(0)
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switch(base2[0] & 0xc) {
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case 0x0: { // 8bit pcm
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for(int i=0; i<samples; i++) {
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cur_pfrac += delta;
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while(cur_pfrac & ~0xffff) {
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cur_pfrac += fdelta;
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@ -204,27 +197,22 @@ void k054539_device::sound_stream_update(sound_stream &stream, stream_sample_t *
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cur_pval = cur_val;
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cur_val = (INT16)(rom[cur_pos] << 8);
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if(cur_val == (INT16)0x8000) {
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if(base2[1] & 1) {
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if(cur_val == (INT16)0x8000 && (base2[1] & 1)) {
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cur_pos = (base1[0x08] | (base1[0x09] << 8) | (base1[0x0a] << 16)) & rom_mask;
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cur_val = (INT16)(rom[cur_pos] << 8);
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if(cur_val != (INT16)0x8000)
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continue;
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}
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if(cur_val == (INT16)0x8000) {
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keyoff(ch);
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goto end_channel_0;
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}
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}
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UPDATE_CHANNELS;
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}
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end_channel_0:
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cur_val = 0;
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break;
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}
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}
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break;
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}
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case 0x4: { // 16bit pcm lsb first
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pdelta <<= 1;
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for(int i=0; i<samples; i++) {
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cur_pfrac += delta;
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while(cur_pfrac & ~0xffff) {
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cur_pfrac += fdelta;
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@ -232,23 +220,19 @@ void k054539_device::sound_stream_update(sound_stream &stream, stream_sample_t *
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cur_pval = cur_val;
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cur_val = (INT16)(rom[cur_pos] | rom[cur_pos+1]<<8);
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if(cur_val == (INT16)0x8000) {
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if(base2[1] & 1) {
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if(cur_val == (INT16)0x8000 && (base2[1] & 1)) {
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cur_pos = (base1[0x08] | (base1[0x09] << 8) | (base1[0x0a] << 16)) & rom_mask;
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cur_val = (INT16)(rom[cur_pos] | rom[cur_pos+1]<<8);
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if(cur_val != (INT16)0x8000)
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continue;
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}
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if(cur_val == (INT16)0x8000) {
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keyoff(ch);
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goto end_channel_4;
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}
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}
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UPDATE_CHANNELS;
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}
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end_channel_4:
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cur_val = 0;
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break;
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}
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}
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break;
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}
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case 0x8: { // 4bit dpcm
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cur_pos <<= 1;
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cur_pfrac <<= 1;
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@ -257,7 +241,6 @@ void k054539_device::sound_stream_update(sound_stream &stream, stream_sample_t *
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cur_pos |= 1;
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}
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for(int i=0; i<samples; i++) {
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cur_pfrac += delta;
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while(cur_pfrac & ~0xffff) {
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cur_pfrac += fdelta;
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@ -265,17 +248,15 @@ void k054539_device::sound_stream_update(sound_stream &stream, stream_sample_t *
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cur_pval = cur_val;
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cur_val = rom[cur_pos>>1];
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if(cur_val == 0x88) {
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if(base2[1] & 1) {
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if(cur_val == 0x88 && (base2[1] & 1)) {
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cur_pos = ((base1[0x08] | (base1[0x09] << 8) | (base1[0x0a] << 16)) & rom_mask) << 1;
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cur_val = rom[cur_pos>>1];
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if(cur_val != 0x88)
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goto next_iter;
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}
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if(cur_val == 0x88) {
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keyoff(ch);
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goto end_channel_8;
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cur_val = 0;
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break;
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}
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next_iter:
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if(cur_pos & 1)
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cur_val >>= 4;
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else
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@ -287,9 +268,6 @@ void k054539_device::sound_stream_update(sound_stream &stream, stream_sample_t *
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cur_val = 32767;
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}
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UPDATE_CHANNELS;
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}
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end_channel_8:
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cur_pfrac >>= 1;
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if(cur_pos & 1)
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cur_pfrac |= 0x8000;
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@ -300,35 +278,27 @@ void k054539_device::sound_stream_update(sound_stream &stream, stream_sample_t *
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LOG(("Unknown sample type %x for channel %d\n", base2[0] & 0xc, ch));
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break;
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}
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lval += cur_val * lvol;
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rval += cur_val * rvol;
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rbase[(rdelta + reverb_pos) & 0x1fff] += INT16(cur_val*rbvol);
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chan->pos = cur_pos;
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chan->pfrac = cur_pfrac;
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chan->pval = cur_pval;
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chan->val = cur_val;
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if(regupdate()) {
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base1[0x0c] = cur_pos & 0xff;
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base1[0x0d] = cur_pos>> 8 & 0xff;
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base1[0x0e] = cur_pos>>16 & 0xff;
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}
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}
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//* drivers should be given the option to disable reverb when things go terribly wrong
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if(!(flags & DISABLE_REVERB))
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{
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for(int i=0; i<samples; i++) {
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INT16 val = rbase[(i+reverb_pos) & 0x3fff];
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outputs[0][i] += val;
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outputs[1][i] += val;
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reverb_pos = (reverb_pos + 1) & 0x1fff;
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outputs[0][sample] = INT16(lval);
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outputs[1][sample] = INT16(rval);
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}
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}
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if(cur_reverb_pos + samples > 0x4000) {
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int i = 0x4000 - cur_reverb_pos;
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memset(rbase + cur_reverb_pos, 0, i*2);
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memset(rbase, 0, (samples-i)*2);
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} else
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memset(rbase + cur_reverb_pos, 0, samples*2);
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}
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void k054539_device::device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr)
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{
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@ -342,11 +312,10 @@ void k054539_device::init_chip()
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memset(posreg_latch, 0, sizeof(posreg_latch)); //*
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flags |= UPDATE_AT_KEYON; //* make it default until proven otherwise
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// Real size of 0x4000, the addon is to simplify the reverb buffer computations
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ram = auto_alloc_array(machine(), unsigned char, 0x4000*2+clock()/50*2);
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ram = auto_alloc_array(machine(), unsigned char, 0x4000);
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reverb_pos = 0;
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cur_ptr = 0;
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memset(ram, 0, 0x4000*2+clock()/50*2);
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memset(ram, 0, 0x4000);
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const memory_region *reg = (rgnoverride != NULL) ? machine().region(rgnoverride) : region();
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rom = *reg;
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