mirror of
https://github.com/retro100/dosbox-wii.git
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121 lines
3.4 KiB
C++
121 lines
3.4 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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#pragma once
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//**************************************************************************
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// INTERFACE CONFIGURATION MACROS
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//**************************************************************************
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#define MCFG_SAA1099_ADD(_tag, _clock) \
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MCFG_DEVICE_ADD(_tag, SAA1099, _clock)
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#define MCFG_SAA1099_REPLACE(_tag, _clock) \
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MCFG_DEVICE_REPLACE(_tag, SAA1099, _clock)
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//**************************************************************************
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// TYPE DEFINITIONS
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//**************************************************************************
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//Container class for int that just initalizes to 0
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class NullInt {
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int value;
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public:
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operator int& () {
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return value;
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}
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int& operator= ( int set ) {
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value = set;
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return value;
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}
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NullInt( int set = 0 ) : value( set ) {
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}
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};
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// ======================> saa1099_device
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class saa1099_device : public device_t,
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public device_sound_interface
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{
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public:
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saa1099_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
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DECLARE_WRITE8_MEMBER( control_w );
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DECLARE_WRITE8_MEMBER( data_w );
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DECLARE_WRITE8_MEMBER( write );
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//protected:
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// device-level overrides
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virtual void device_start();
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// sound stream update overrides
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virtual void sound_stream_update(sound_stream &stream, stream_sample_t **inputs, stream_sample_t **outputs, int samples);
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private:
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struct saa1099_channel
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{
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saa1099_channel() {
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//Quite hacky, but let's see how it goes
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memset( this, 0, sizeof( *this ) );
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}
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int frequency ; /* frequency (0x00..0xff) */
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int freq_enable ; /* frequency enable */
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int noise_enable ; /* noise enable */
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int octave ; /* octave (0x00..0x07) */
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int amplitude[2]; /* amplitude (0x00..0x0f) */
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int envelope[2]; /* envelope (0x00..0x0f or 0x10 == off) */
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/* vars to simulate the square wave */
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double counter ;
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double freq ;
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int level ;
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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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counter = 0;
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freq = 0;
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level = 0xFFFFFFFF;
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}
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/* vars to simulate the noise generator output */
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double counter;
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double freq;
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uint32_t level; /* noise polynomial shifter */
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};
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void envelope_w(int ch);
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sound_stream *m_stream; /* our stream */
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int m_noise_params[2]; /* noise generators parameters */
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int m_env_enable[2]; /* envelope generators enable */
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int m_env_reverse_right[2]; /* envelope reversed for right channel */
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int m_env_mode[2]; /* envelope generators mode */
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int m_env_bits[2]; /* non zero = 3 bits resolution */
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int m_env_clock[2]; /* envelope clock mode (non-zero external) */
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int m_env_step[2]; /* current envelope step */
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int m_all_ch_enable; /* all channels enable */
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int m_sync_state; /* sync all channels */
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int 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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double m_sample_rate;
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int m_master_clock;
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};
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DECLARE_DEVICE_TYPE(SAA1099, saa1099_device)
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#endif // MAME_SOUND_SAA1099_H
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