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Diffstat (limited to 'src/mame/audio/xavix.cpp')
-rw-r--r--src/mame/audio/xavix.cpp173
1 files changed, 116 insertions, 57 deletions
diff --git a/src/mame/audio/xavix.cpp b/src/mame/audio/xavix.cpp
index b6497d69819..03941dc9b7d 100644
--- a/src/mame/audio/xavix.cpp
+++ b/src/mame/audio/xavix.cpp
@@ -7,7 +7,7 @@
#define VERBOSE 1
#include "logmacro.h"
-// 16 stereo channels?
+// 16 stereo voices?
// xavix_sound_device
@@ -17,33 +17,120 @@ xavix_sound_device::xavix_sound_device(const machine_config &mconfig, const char
: device_t(mconfig, XAVIX_SOUND, tag, owner, clock)
, device_sound_interface(mconfig, *this)
, m_stream(nullptr)
+ , m_readregs_cb(*this)
+ , m_readsamples_cb(*this)
{
}
void xavix_sound_device::device_start()
{
+ m_readregs_cb.resolve_safe(0xff);
+ m_readsamples_cb.resolve_safe(0x80);
+
m_stream = stream_alloc(0, 1, 8000);
}
void xavix_sound_device::device_reset()
{
+ for (int v = 0; v < 16; v++)
+ {
+ m_voice[v].enabled = false;
+ m_voice[v].position = 0x00;
+ m_voice[v].bank = 0x00;
+ }
}
+
void xavix_sound_device::sound_stream_update(sound_stream &stream, stream_sample_t **inputs, stream_sample_t **outputs, int samples)
{
// reset the output stream
memset(outputs[0], 0, samples * sizeof(*outputs[0]));
+ int outpos = 0;
// loop while we still have samples to generate
while (samples-- != 0)
{
- //
+ for (int v = 0; v < 16; v++)
+ {
+ if (m_voice[v].enabled == true)
+ {
+ if (m_voice[v].type == 2 || m_voice[v].type == 3)
+ {
+ int8_t sample = m_readsamples_cb((m_voice[v].bank << 16) | m_voice[v].position);
+
+ if ((uint8_t)sample == 0x80)
+ {
+ m_voice[v].enabled = false;
+ break;
+ }
+
+ outputs[0][outpos] += sample * 0x10;
+ m_voice[v].position++;
+ }
+ }
+ }
+ outpos++;
}
}
+void xavix_sound_device::enable_voice(int voice)
+{
+ LOG("voice %d 0->1 ", voice);
+ int voicemembase = voice * 0x10;
+
+ uint16_t param1 = (m_readregs_cb(voicemembase + 0x1) << 8) | (m_readregs_cb(voicemembase + 0x0)); // sample rate maybe?
+ uint16_t param2 = (m_readregs_cb(voicemembase + 0x3) << 8) | (m_readregs_cb(voicemembase + 0x2)); // seems to be a start position
+ uint16_t param3 = (m_readregs_cb(voicemembase + 0x5) << 8) | (m_readregs_cb(voicemembase + 0x4)); // another start position? sometimes same as param6
+ uint8_t param4a = (m_readregs_cb(voicemembase + 0x7));
+ uint8_t param4b = (m_readregs_cb(voicemembase + 0x6)); // upper 8 bits of memory address? 8 bits unused?
+
+ // these don't seem to be populated as often, maybe some kind of effect / envelope filter?
+ uint8_t param5a = (m_readregs_cb(voicemembase + 0x9));
+ uint8_t param5b = (m_readregs_cb(voicemembase + 0x8));
+ uint16_t param6 = (m_readregs_cb(voicemembase + 0xb) << 8) | (m_readregs_cb(voicemembase + 0xa)); // seems to be a start position
+ uint16_t param7 = (m_readregs_cb(voicemembase + 0xd) << 8) | (m_readregs_cb(voicemembase + 0xc)); // another start position? sometimes same as param6
+ uint8_t param8a = (m_readregs_cb(voicemembase + 0xf));
+ uint8_t param8b = (m_readregs_cb(voicemembase + 0xe)); // upper 8 bits of memory address? 8 bits unused (or not unused?, get populated with increasing values sometimes?)
+ LOG(" (params %04x %04x %04x %02x %02x %02x %02x %04x %04x %02x %02x)\n", param1, param2, param3, param4a, param4b, param5a, param5b, param6, param7, param8a, param8b);
+
+ uint32_t address1 = (param2 | param4b << 16) & 0x00ffffff; // definitely addresses based on rad_snow
+ uint32_t address2 = (param3 | param4b << 16) & 0x00ffffff;
+
+ uint32_t address3 = (param6 | param8b << 16) & 0x00ffffff; // still looks like addresses, sometimes pointing at RAM
+ uint32_t address4 = (param7 | param8b << 16) & 0x00ffffff;
+
+
+ LOG(" (possible meanings mode %01x rate %04x address1 %08x address2 %08x address3 %08x address4 %08x)\n", param1 & 0x3, param1 >> 2, address1, address2, address3, address4);
+
+ m_voice[voice].enabled = true;
+
+ m_voice[voice].bank = param4b;
+ m_voice[voice].position = param2; // param3
+ m_voice[voice].type = param1 & 0x3;
+
+
+ // samples appear to be PCM, 0x80 terminated
+}
+
+
+
// xavix_state support
-/* 75f0, 75f1 - 2x8 bits (16 channels?) */
+READ8_MEMBER(xavix_state::sound_regram_read_cb)
+{
+ // 0x00 would be zero page memory, and problematic for many reasons, assume it just doesn't work like that
+ if ((m_sound_regbase & 0x3f) != 0x00)
+ {
+ uint16_t memorybase = (m_sound_regbase & 0x3f) << 8;
+
+ return m_mainram[memorybase + offset];
+ }
+
+ return 0x00;
+}
+
+
+/* 75f0, 75f1 - 2x8 bits (16 voices?) */
READ8_MEMBER(xavix_state::sound_reg16_0_r)
{
LOG("%s: sound_reg16_0_r %02x\n", machine().describe_context(), offset);
@@ -55,24 +142,24 @@ WRITE8_MEMBER(xavix_state::sound_reg16_0_w)
/* looks like the sound triggers
offset 0
- data & 0x01 - channel 0 (registers at regbase + 0x00) eg 0x3b00 - 0x3b0f in monster truck
- data & 0x02 - channel 1 (registers at regbase + 0x10) eg 0x3b10 - 0x3b1f in monster truck
- data & 0x04 - channel 2
- data & 0x08 - channel 3
- data & 0x10 - channel 4
- data & 0x20 - channel 5
- data & 0x40 - channel 6
- data & 0x80 - channel 7
+ data & 0x01 - voice 0 (registers at regbase + 0x00) eg 0x3b00 - 0x3b0f in monster truck
+ data & 0x02 - voice 1 (registers at regbase + 0x10) eg 0x3b10 - 0x3b1f in monster truck
+ data & 0x04 - voice 2
+ data & 0x08 - voice 3
+ data & 0x10 - voice 4
+ data & 0x20 - voice 5
+ data & 0x40 - voice 6
+ data & 0x80 - voice 7
offset 1
- data & 0x01 - channel 8
- data & 0x02 - channel 9
- data & 0x04 - channel 10
- data & 0x08 - channel 11
- data & 0x10 - channel 12
- data & 0x20 - channel 13
- data & 0x40 - channel 14 (registers at regbase + 0xf0) eg 0x3be0 - 0x3bef in monster truck
- data & 0x80 - channel 15 (registers at regbase + 0xf0) eg 0x3bf0 - 0x3bff in monster truck
+ data & 0x01 - voice 8
+ data & 0x02 - voice 9
+ data & 0x04 - voice 10
+ data & 0x08 - voice 11
+ data & 0x10 - voice 12
+ data & 0x20 - voice 13
+ data & 0x40 - voice 14 (registers at regbase + 0xf0) eg 0x3be0 - 0x3bef in monster truck
+ data & 0x80 - voice 15 (registers at regbase + 0xf0) eg 0x3bf0 - 0x3bff in monster truck
*/
if (offset == 0)
LOG("%s: sound_reg16_0_w %02x, %02x (%d %d %d %d %d %d %d %d - - - - - - - -)\n", machine().describe_context(), offset, data, (data & 0x01) ? 1 : 0, (data & 0x02) ? 1 : 0, (data & 0x04) ? 1 : 0, (data & 0x08) ? 1 : 0, (data & 0x10) ? 1 : 0, (data & 0x20) ? 1 : 0, (data & 0x40) ? 1 : 0, (data & 0x80) ? 1 : 0);
@@ -82,43 +169,15 @@ WRITE8_MEMBER(xavix_state::sound_reg16_0_w)
for (int i = 0; i < 8; i++)
{
- int channel_state = (data & (1 << i));
- int old_channel_state = (m_soundreg16_0[offset] & (1 << i));
- if (channel_state != old_channel_state)
+ int voice_state = (data & (1 << i));
+ int old_voice_state = (m_soundreg16_0[offset] & (1 << i));
+ if (voice_state != old_voice_state)
{
- if (channel_state)
+ if (voice_state)
{
- int channel = (offset * 8 + i);
-
- LOG("channel %d 0->1 ", channel);
-
- uint16_t memorybase = ((m_sound_regbase & 0x3f) << 8) | (channel * 0x10);
-
- uint16_t param1 = (m_mainram[memorybase + 0x1] << 8) | (m_mainram[memorybase + 0x0]); // sample rate maybe?
- uint16_t param2 = (m_mainram[memorybase + 0x3] << 8) | (m_mainram[memorybase + 0x2]); // seems to be a start position
- uint16_t param3 = (m_mainram[memorybase + 0x5] << 8) | (m_mainram[memorybase + 0x4]); // another start position? sometimes same as param6
- uint8_t param4a = (m_mainram[memorybase + 0x7]);
- uint8_t param4b = (m_mainram[memorybase + 0x6]); // upper 8 bits of memory address? 8 bits unused?
-
- // these don't seem to be populated as often, maybe some kind of effect / envelope filter?
- uint8_t param5a = (m_mainram[memorybase + 0x9]);
- uint8_t param5b = (m_mainram[memorybase + 0x8]);
- uint16_t param6 = (m_mainram[memorybase + 0xb] << 8) | (m_mainram[memorybase + 0xa]); // seems to be a start position
- uint16_t param7 = (m_mainram[memorybase + 0xd] << 8) | (m_mainram[memorybase + 0xc]); // another start position? sometimes same as param6
- uint8_t param8a = (m_mainram[memorybase + 0xf]);
- uint8_t param8b = (m_mainram[memorybase + 0xe]); // upper 8 bits of memory address? 8 bits unused (or not unused?, get populated with increasing values sometimes?)
- LOG(" (params %04x %04x %04x %02x %02x %02x %02x %04x %04x %02x %02x)\n", param1, param2, param3, param4a, param4b, param5a, param5b, param6, param7, param8a, param8b);
-
- uint32_t address1 = (param2 | param4b << 16) & 0x00ffffff; // definitely addresses based on rad_snow
- uint32_t address2 = (param3 | param4b << 16) & 0x00ffffff;
-
- uint32_t address3 = (param6 | param8b << 16) & 0x00ffffff; // still looks like addresses, sometimes pointing at RAM
- uint32_t address4 = (param7 | param8b << 16) & 0x00ffffff;
-
-
- LOG(" (possible meanings mode %01x rate %04x address1 %08x address2 %08x address3 %08x address4 %08x)\n", param1 & 0x3, param1 >> 2, address1, address2, address3, address4);
+ int voice = (offset * 8 + i);
- // samples appear to be PCM, 0x80 terminated
+ m_sound->enable_voice(voice);
}
}
}
@@ -127,7 +186,7 @@ WRITE8_MEMBER(xavix_state::sound_reg16_0_w)
}
-/* 75f0, 75f1 - 2x8 bits (16 channels?) */
+/* 75f0, 75f1 - 2x8 bits (16 voices?) */
READ8_MEMBER(xavix_state::sound_reg16_1_r)
{
LOG("%s: sound_reg16_1_r %02x\n", machine().describe_context(), offset);
@@ -145,7 +204,7 @@ WRITE8_MEMBER(xavix_state::sound_reg16_1_w)
}
-/* 75f4, 75f5 - 2x8 bits (16 channels?) status? */
+/* 75f4, 75f5 - 2x8 bits (16 voices?) status? */
READ8_MEMBER(xavix_state::sound_sta16_r)
{
// used with 75f0/75f1
@@ -170,7 +229,7 @@ WRITE8_MEMBER(xavix_state::sound_volume_w)
WRITE8_MEMBER(xavix_state::sound_regbase_w)
{
// this is the upper 6 bits of the RAM address where the actual sound register sets are
- // (16x16 regs, so complete 0x100 bytes of RAM eg 0x3b means the complete 0x3b00 - 0x3bff range with 0x3b00 - 0x3b0f being channel 1 etc)
+ // (16x16 regs, so complete 0x100 bytes of RAM eg 0x3b means the complete 0x3b00 - 0x3bff range with 0x3b00 - 0x3b0f being voice 1 etc)
m_sound_regbase = data;
LOG("%s: sound_regbase_w %02x (sound regs are at 0x%02x00 to 0x%02xff)\n", machine().describe_context(), data, m_sound_regbase & 0x3f, m_sound_regbase & 0x3f);
}
@@ -272,7 +331,7 @@ WRITE8_MEMBER(xavix_state::sound_irqstatus_w)
m_sound_irqstatus &= ~data & 0xf0;
}
- m_sound_irqstatus = data & 0x0f; // look like IRQ enable flags - 4 sources? channels? timers?
+ m_sound_irqstatus = data & 0x0f; // look like IRQ enable flags - 4 sources? voices? timers?
LOG("%s: sound_irqstatus_w %02x\n", machine().describe_context(), data);
}