154 lines
4.2 KiB
C++
154 lines
4.2 KiB
C++
// license:BSD-3-Clause
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// copyright-holders:Nicola Salmoria
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// additional modifications by tildearrow, cam900 for furnace
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#ifndef MAME_SOUND_SN76496_H
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#define MAME_SOUND_SN76496_H
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#include <stdlib.h>
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#include <stdint.h>
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typedef unsigned char u8;
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class sn76496_base_device {
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public:
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void stereo_w(u8 data);
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void write(u8 data);
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void device_start();
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void sound_stream_update(short** outputs, int outLen);
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inline int32_t get_channel_output(int ch) {
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return ((m_output[ch]!=0)?m_volume[ch]:0);
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}
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//DECLARE_READ_LINE_MEMBER( ready_r ) { return m_ready_state ? 1 : 0; }
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sn76496_base_device(
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int feedbackmask,
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int noise_start,
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int noisetap1,
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int noisetap2,
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bool negate,
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bool stereo,
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int clockdivider,
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bool ncr,
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bool sega);
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sn76496_base_device(
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int feedbackmask,
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int noisetap1,
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int noisetap2,
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bool negate,
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bool stereo,
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int clockdivider,
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bool ncr,
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bool sega)
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: sn76496_base_device(
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feedbackmask,
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feedbackmask,
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noisetap1,
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noisetap2,
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negate,
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stereo,
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clockdivider,
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ncr,
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sega)
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{}
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private:
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inline bool in_noise_mode();
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bool m_ready_state;
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const int32_t m_feedback_mask; // mask for feedback
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const int32_t m_noise_start; // noise start value
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const int32_t m_whitenoise_tap1; // mask for white noise tap 1 (higher one, usually bit 14)
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const int32_t m_whitenoise_tap2; // mask for white noise tap 2 (lower one, usually bit 13)
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bool m_negate; // output negate flag
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const bool m_stereo; // whether we're dealing with stereo or not
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const int32_t m_clock_divider; // clock divider
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const bool m_ncr_style_psg; // flag to ignore writes to regs 1,3,5,6,7 with bit 7 low
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const bool m_sega_style_psg; // flag to make frequency zero acts as if it is one more than max (0x3ff+1) or if it acts like 0; the initial register is pointing to 0x3 instead of 0x0; the volume reg is preloaded with 0xF instead of 0x0
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int32_t m_vol_table[16]; // volume table (for 4-bit to db conversion)
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int32_t m_register[8]; // registers
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int32_t m_last_register; // last register written
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int32_t m_volume[4]; // db volume of voice 0-2 and noise
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uint32_t m_RNG; // noise generator LFSR
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int32_t m_current_clock;
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int32_t m_stereo_mask; // the stereo output mask
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int32_t m_period[4]; // Length of 1/2 of waveform
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int32_t m_count[4]; // Position within the waveform
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int32_t m_output[4]; // 1-bit output of each channel, pre-volume
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};
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// SN76496: Whitenoise verified, phase verified, periodic verified (by Michael Zapf)
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class sn76496_device : public sn76496_base_device
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{
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public:
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sn76496_device();
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};
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// Y2404 not verified yet. todo: verify; (don't be fooled by the Y, it's a TI chip, not Yamaha)
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class y2404_device : public sn76496_base_device
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{
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public:
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y2404_device();
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};
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// SN76489 not verified yet. todo: verify;
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class sn76489_device : public sn76496_base_device
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{
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public:
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sn76489_device();
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};
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// SN76489A: whitenoise verified, phase verified, periodic verified (by plgdavid)
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class sn76489a_device : public sn76496_base_device
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{
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public:
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sn76489a_device();
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};
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// SN76494 not verified, (according to datasheet: same as sn76489a but without the /8 divider)
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class sn76494_device : public sn76496_base_device
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{
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public:
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sn76494_device();
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};
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// SN94624 whitenoise verified, phase verified, period verified; verified by PlgDavid
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class sn94624_device : public sn76496_base_device
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{
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public:
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sn94624_device();
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};
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// NCR8496 whitenoise verified, phase verified; verified by ValleyBell & NewRisingSun
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class ncr8496_device : public sn76496_base_device
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{
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public:
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ncr8496_device();
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};
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// PSSJ-3 whitenoise verified, phase verified; verified by ValleyBell & NewRisingSun
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class pssj3_device : public sn76496_base_device
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{
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public:
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pssj3_device();
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};
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// Verified by Justin Kerk
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class gamegear_device : public sn76496_base_device
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{
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public:
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gamegear_device();
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};
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// todo: verify; from smspower wiki, assumed to have same invert as gamegear
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class segapsg_device : public sn76496_base_device
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{
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public:
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segapsg_device();
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};
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#endif // MAME_SOUND_SN76496_H
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