ymz770.cpp: 2nd volume control, notes (nw)
MetalliC
parent
a2be3de956
commit
bb96e249ca
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@ -2,20 +2,22 @@
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// copyright-holders:Olivier Galibert, R. Belmont, MetalliC
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/***************************************************************************
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ymz770.c
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Yamaha YMZ770C and YMZ774
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Emulation by R. Belmont and MetalliC
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AMM decode by Olivier Galibert
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-----
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TODO:
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- A lot of unimplemented features, even simple ones like panning,
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these should be added once we find out any software that uses it.
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- Sequencer is very preliminary
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- verify if pan 100% correct
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- What does channel ATBL mean?
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- Is YMZ774(and other variants) the same family as this chip?
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What are the differences?
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770:
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- verify if pan 100% correct
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- sequencer timers and triggers not implemented (seems used in Deathsmiles ending tune)
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774:
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- find out how volume/pan delayed transition works (used few times in orleg2 attract mode)
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- 4 channel output
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- Equalizer
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- Sequencer (not used)
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***************************************************************************/
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@ -45,6 +47,7 @@ ymz770_device::ymz770_device(const machine_config &mconfig, device_type type, co
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, m_mute(0)
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, m_doen(0)
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, m_vlma(0)
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, m_vlma1(0)
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, m_bsl(0)
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, m_cpl(0)
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, m_rom(*this, DEVICE_SELF)
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@ -74,6 +77,7 @@ void ymz770_device::device_start()
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save_item(NAME(m_mute));
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save_item(NAME(m_doen));
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save_item(NAME(m_vlma));
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save_item(NAME(m_vlma1));
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save_item(NAME(m_bsl));
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save_item(NAME(m_cpl));
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@ -82,6 +86,8 @@ void ymz770_device::device_start()
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save_item(NAME(m_channels[ch].phrase), ch);
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save_item(NAME(m_channels[ch].pan), ch);
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save_item(NAME(m_channels[ch].pan_delay), ch);
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save_item(NAME(m_channels[ch].pan1), ch);
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save_item(NAME(m_channels[ch].pan1_delay), ch);
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save_item(NAME(m_channels[ch].volume), ch);
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save_item(NAME(m_channels[ch].volume_delay), ch);
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save_item(NAME(m_channels[ch].volume2), ch);
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@ -115,6 +121,8 @@ void ymz770_device::device_reset()
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channel.phrase = 0;
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channel.pan = 64;
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channel.pan_delay = 0;
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channel.pan1 = 64;
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channel.pan1_delay = 0;
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channel.volume = 0;
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channel.volume_delay = 0;
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channel.volume2 = 0;
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@ -158,9 +166,10 @@ void ymz770_device::sound_stream_update(sound_stream &stream, stream_sample_t **
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if (channel.output_remaining > 0)
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{
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// force finish current block
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int32_t smpl = channel.output_data[channel.output_ptr++] * channel.volume; // volume is linear, 0 - 128 (100%)
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mixr += (smpl * channel.pan) >> 14; // pan seems linear, 0 - 128, where 0 = 100% left, 128 = 100% right, 64 = 50% left 50% right
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mixl += (smpl * (128 - channel.pan)) >> 14;
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int32_t smpl = (channel.output_data[channel.output_ptr++] * channel.volume) >> 7; // volume is linear, 0 - 128 (100%)
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smpl = (smpl * channel.volume2) >> 7;
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mixr += (smpl * channel.pan) >> 7; // pan seems linear, 0 - 128, where 0 = 100% left, 128 = 100% right, 64 = 50% left 50% right
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mixl += (smpl * (128 - channel.pan)) >> 7;
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channel.output_remaining--;
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if (channel.output_remaining == 0 && !channel.is_playing)
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@ -205,9 +214,10 @@ retry:
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channel.output_remaining--;
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channel.output_ptr = 1;
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int32_t smpl = channel.output_data[0] * channel.volume;
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mixr += (smpl * channel.pan) >> 14;
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mixl += (smpl * (128 - channel.pan)) >> 14;
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int32_t smpl = (channel.output_data[0] * channel.volume) >> 7;
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smpl = (smpl * channel.volume2) >> 7;
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mixr += (smpl * channel.pan) >> 7;
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mixl += (smpl * (128 - channel.pan)) >> 7;
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}
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}
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}
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@ -340,6 +350,7 @@ void ymz770_device::internal_reg_write(uint8_t reg, uint8_t data)
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case 1:
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m_channels[ch].volume = data;
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m_channels[ch].volume2 = 128;
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break;
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case 2:
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@ -460,6 +471,13 @@ void ymz774_device::internal_reg_write(uint8_t reg, uint8_t data)
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if (data) logerror("unimplemented write %02X %02X\n", reg, data);
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m_channels[ch].pan_delay = data;
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break;
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case 0x38: // Pan T/B
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m_channels[ch].pan1 = data;
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break;
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case 0x40: // Pan T/B delayed transition
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if (data) logerror("unimplemented write %02X %02X\n", reg, data);
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m_channels[ch].pan1_delay = data;
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break;
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case 0x48: // Loop
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m_channels[ch].loop = data;
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break;
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@ -485,7 +503,7 @@ void ymz774_device::internal_reg_write(uint8_t reg, uint8_t data)
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}
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else if (reg < 0xd0)
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{
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if (m_bank == 0) // Sequencer, is it used in PGM2 ?
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if (m_bank == 0) // Sequencer, in PGM2 games not used at all
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{
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if (data) logerror("sequencer unimplemented %02X %02X\n", reg, data);
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}
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@ -498,6 +516,9 @@ void ymz774_device::internal_reg_write(uint8_t reg, uint8_t data)
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case 0xd0:
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m_vlma = data;
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break;
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case 0xd1:
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m_vlma1 = data;
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break;
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case 0xd2:
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m_cpl = data;
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break;
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@ -65,7 +65,8 @@ protected:
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uint8_t m_cur_reg;
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uint8_t m_mute; // mute chip
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uint8_t m_doen; // digital output enable
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uint8_t m_vlma; // overall AAM volume
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uint8_t m_vlma; // overall volume L0/R0
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uint8_t m_vlma1; // overall volume L1/R1
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uint8_t m_bsl; // boost level
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uint8_t m_cpl; // clip limiter
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required_region_ptr<uint8_t> m_rom;
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@ -75,6 +76,8 @@ protected:
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uint16_t phrase;
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uint8_t pan;
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uint8_t pan_delay;
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uint8_t pan1;
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uint8_t pan1_delay;
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uint8_t volume;
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uint8_t volume_delay;
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uint8_t volume2;
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