// 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 //************************************************************************** // 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, u32 clock); void control_w(u8 data); void data_w(u8 data); void write(offs_t offset, u8 data); protected: // device-level overrides virtual void device_start() override; virtual void device_clock_changed() override; // sound stream update overrides virtual void sound_stream_update(sound_stream &stream, std::vector const &inputs, std::vector &outputs) override; private: struct saa1099_channel { saa1099_channel() : amplitude{ 0, 0 }, envelope{ 0, 0 } { } u8 frequency = 0; // frequency (0x00..0xff) bool freq_enable = false; // frequency enable bool noise_enable = false; // noise enable u8 octave = 0; // octave (0x00..0x07) u16 amplitude[2]; // amplitude u8 envelope[2]; // envelope (0x00..0x0f or 0x10 == off) /* vars to simulate the square wave */ inline u32 freq() const { return (511 - frequency) << (8 - octave); } // clock / ((511 - frequency) * 2^(8 - octave)) int counter = 0; u8 level = 0; }; struct saa1099_noise { saa1099_noise() { } /* vars to simulate the noise generator output */ int counter = 0; int freq = 0; u32 level = 0xffffffffU; // noise polynomial shifter }; void envelope_w(int ch); sound_stream *m_stream; // our stream u8 m_noise_params[2]; // noise generators parameters bool m_env_enable[2]; // envelope generators enable bool m_env_reverse_right[2]; // envelope reversed for right channel u8 m_env_mode[2]; // envelope generators mode bool m_env_bits[2]; // true = 3 bits resolution bool m_env_clock[2]; // envelope clock mode (true external) u8 m_env_step[2]; // current envelope step bool m_all_ch_enable; // all channels enable bool m_sync_state; // sync all channels u8 m_selected_reg; // selected register saa1099_channel m_channels[6]; // channels saa1099_noise m_noise[2]; // noise generators }; DECLARE_DEVICE_TYPE(SAA1099, saa1099_device) #endif // MAME_SOUND_SAA1099_H