text: // license:BSD-3-Clause
  // copyright-holders:Juergen Buchmueller, Manuel Abadia
  /**********************************************
      Philips SAA1099 Sound driver
  **********************************************/
  
  #ifndef MAME_SOUND_SAA1099_H
  #define MAME_SOUND_SAA1099_H
  
  #pragma once
  
  //**************************************************************************
  //  INTERFACE CONFIGURATION MACROS
  //**************************************************************************
  
  #define MCFG_SAA1099_ADD(_tag, _clock) \
  	MCFG_DEVICE_ADD(_tag, SAA1099, _clock)
  #define MCFG_SAA1099_REPLACE(_tag, _clock) \
  	MCFG_DEVICE_REPLACE(_tag, SAA1099, _clock)
  
  
  //**************************************************************************
  //  TYPE DEFINITIONS
  //**************************************************************************
  
  
  // ======================> saa1099_device
  
  class saa1099_device : public device_t,
  						public device_sound_interface
  {
  public:
  	saa1099_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
  
  	DECLARE_WRITE8_MEMBER( control_w );
  	DECLARE_WRITE8_MEMBER( data_w );
  
  	DECLARE_WRITE8_MEMBER( write );
  
  protected:
  	// device-level overrides
  	virtual void device_start() override;
  
  	// sound stream update overrides
  	virtual void sound_stream_update(sound_stream &stream, stream_sample_t **inputs, stream_sample_t **outputs, int samples) override;
  
  private:
  	struct saa1099_channel
  	{
  		saa1099_channel() : amplitude{ 0, 0 }, envelope{ 0, 0 } { }
  
  		int frequency    = 0;   /* frequency (0x00..0xff) */
  		int freq_enable  = 0;   /* frequency enable */
  		int noise_enable = 0;   /* noise enable */
  		int octave       = 0;   /* octave (0x00..0x07) */
  		int amplitude[2];       /* amplitude (0x00..0x0f) */
  		int envelope[2];        /* envelope (0x00..0x0f or 0x10 == off) */
  
  		/* vars to simulate the square wave */
  		double counter = 0.0;
  		double freq = 0.0;
  		int level = 0;
  	};
  
  	struct saa1099_noise
  	{
  		saa1099_noise() { }
  
  		/* vars to simulate the noise generator output */
  		double counter = 0.0;
  		double freq = 0.0;
  		uint32_t level = 0xFFFFFFFF;         /* noise polynomial shifter */
  	};
  
  	void envelope_w(int ch);
  
  	sound_stream *m_stream;          /* our stream */
  	int m_noise_params[2];            /* noise generators parameters */
  	int m_env_enable[2];              /* envelope generators enable */
  	int m_env_reverse_right[2];       /* envelope reversed for right channel */
  	int m_env_mode[2];                /* envelope generators mode */
  	int m_env_bits[2];                /* non zero = 3 bits resolution */
  	int m_env_clock[2];               /* envelope clock mode (non-zero external) */
  	int m_env_step[2];                /* current envelope step */
  	int m_all_ch_enable;              /* all channels enable */
  	int m_sync_state;                 /* sync all channels */
  	int m_selected_reg;               /* selected register */
  	saa1099_channel m_channels[6];    /* channels */
  	saa1099_noise m_noise[2];         /* noise generators */
  	double m_sample_rate;
  	int m_master_clock;
  };
  
  DECLARE_DEVICE_TYPE(SAA1099, saa1099_device)
  
  #endif // MAME_SOUND_SAA1099_H
  