// license:BSD-3-Clause // copyright-holders:Aaron Giles #ifndef MAME_SOUND_CEM3394_H #define MAME_SOUND_CEM3394_H #pragma once class cem3394_device : public device_t, public device_sound_interface { public: // inputs enum { VCO_FREQUENCY = 0, MODULATION_AMOUNT, WAVE_SELECT, PULSE_WIDTH, MIXER_BALANCE, FILTER_RESONANCE, FILTER_FREQENCY, FINAL_GAIN }; cem3394_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock); void set_vco_zero_freq(double freq) { m_vco_zero_freq = freq; } void set_filter_zero_freq(double freq) { m_filter_zero_freq = freq; } protected: // device-level overrides virtual void device_start() override; // sound stream update overrides virtual void sound_stream_update(sound_stream &stream, std::vector const &inputs, std::vector &outputs) override; public: // Set the voltage going to a particular parameter void set_voltage(int input, double voltage); // Get the translated parameter associated with the given input as follows: // VCO_FREQUENCY: frequency in Hz // MODULATION_AMOUNT: scale factor, 0.0 to 2.0 // WAVE_SELECT: voltage from this line // PULSE_WIDTH: width fraction, from 0.0 to 1.0 // MIXER_BALANCE: balance, from -1.0 to 1.0 // FILTER_RESONANCE: resonance, from 0.0 to 1.0 // FILTER_FREQENCY: frequency, in Hz // FINAL_GAIN: gain, in dB double get_parameter(int input); private: double compute_db(double voltage); stream_buffer::sample_t compute_db_volume(double voltage); private: double filter(double input, double cutoff); sound_stream *m_stream; // our stream double m_vco_zero_freq; // frequency of VCO at 0.0V double m_filter_zero_freq; // frequency of filter at 0.0V double m_values[8]; // raw values of registers u8 m_wave_select; // flags which waveforms are enabled double m_volume; // linear overall volume (0-1) double m_mixer_internal; // linear internal volume (0-1) double m_mixer_external; // linear external volume (0-1) double m_vco_position; // current VCO frequency position (always < 1.0) double m_vco_step; // per-sample VCO step double m_filter_frequency; // baseline filter frequency double m_filter_modulation; // depth of modulation (up to 1.0) double m_filter_resonance; // depth of modulation (up to 1.0) double m_filter_in[4]; // filter input history double m_filter_out[4]; // filter output history double m_pulse_width; // fractional pulse width double m_inv_sample_rate; // 1/current sample rate }; DECLARE_DEVICE_TYPE(CEM3394, cem3394_device) #endif // MAME_SOUND_CEM3394_H