c0e9b48b5b
SAA1099 (SAASound and MAME), Lynx, MMC5, N163, PC Engine, PC Speaker, PET, QSound, WonderSwan, VERA, VIC-20, VRC6 and X1-010!
80 lines
2.5 KiB
C++
80 lines
2.5 KiB
C++
// license:BSD-3-Clause
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// copyright-holders:Juergen Buchmueller, Manuel Abadia
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/**********************************************
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Philips SAA1099 Sound driver
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**********************************************/
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#ifndef MAME_SOUND_SAA1099_H
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#define MAME_SOUND_SAA1099_H
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#include "../../dispatch.h"
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//**************************************************************************
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// TYPE DEFINITIONS
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//**************************************************************************
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// ======================> saa1099_device
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class saa1099_device
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{
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public:
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saa1099_device();
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void control_w(unsigned char data);
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void data_w(unsigned char data);
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void write(int offset, unsigned char data);
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// device-level overrides
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void device_start();
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void device_clock_changed();
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// sound stream update overrides
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void sound_stream_update(short** outputs, int len, DivDispatchOscBuffer** oscBuf=NULL);
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private:
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struct saa1099_channel
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{
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saa1099_channel() : amplitude{ 0, 0 }, envelope{ 0, 0 } { }
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unsigned char frequency = 0; // frequency (0x00..0xff)
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bool freq_enable = false; // frequency enable
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bool noise_enable = false; // noise enable
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unsigned char octave = 0; // octave (0x00..0x07)
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unsigned short amplitude[2]; // amplitude
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unsigned char envelope[2]; // envelope (0x00..0x0f or 0x10 == off)
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/* vars to simulate the square wave */
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inline unsigned int freq() const { return (511 - frequency) << (8 - octave); } // clock / ((511 - frequency) * 2^(8 - octave))
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int counter = 0;
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unsigned char level = 0;
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};
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struct saa1099_noise
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{
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saa1099_noise() { }
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/* vars to simulate the noise generator output */
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int counter = 0;
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int freq = 0;
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unsigned int level = 0xffffffffU; // noise polynomial shifter
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};
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void envelope_w(int ch);
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unsigned char m_noise_params[2]; // noise generators parameters
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bool m_env_enable[2]; // envelope generators enable
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bool m_env_reverse_right[2]; // envelope reversed for right channel
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unsigned char m_env_mode[2]; // envelope generators mode
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bool m_env_bits[2]; // true = 3 bits resolution
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bool m_env_clock[2]; // envelope clock mode (true external)
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unsigned char m_env_step[2]; // current envelope step
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bool m_all_ch_enable; // all channels enable
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bool m_sync_state; // sync all channels
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unsigned char m_selected_reg; // selected register
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saa1099_channel m_channels[6]; // channels
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saa1099_noise m_noise[2]; // noise generators
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};
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#endif // MAME_SOUND_SAA1099_H
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