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// license:BSD-3-Clause
// copyright-holders:Aaron Giles
#ifndef MAME_SOUND_CEM3394_H
#define MAME_SOUND_CEM3394_H
#pragma once
#define CEM3394_EXT_INPUT(_name) void _name(int count, short *buffer)
class cem3394_device : public device_t, public device_sound_interface
{
public:
static constexpr unsigned SAMPLE_RATE = 44100*4;
// inputs
enum
{
VCO_FREQUENCY = 0,
MODULATION_AMOUNT,
WAVE_SELECT,
PULSE_WIDTH,
MIXER_BALANCE,
FILTER_RESONANCE,
FILTER_FREQENCY,
FINAL_GAIN
};
typedef device_delegate<void (int count, short *buffer)> ext_input_delegate;
cem3394_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
template <typename... T> void set_ext_input_callback(T &&... args) { m_ext_cb = ext_input_delegate(std::forward<T>(args)...); }
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, stream_sample_t **inputs, stream_sample_t **outputs, int samples) 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);
uint32_t compute_db_volume(double voltage);
private:
ext_input_delegate m_ext_cb; /* callback to generate external samples */
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 */
uint8_t m_wave_select; /* flags which waveforms are enabled */
uint32_t m_volume; /* linear overall volume (0-256) */
uint32_t m_mixer_internal; /* linear internal volume (0-256) */
uint32_t m_mixer_external; /* linear external volume (0-256) */
uint32_t m_position; /* current VCO frequency position (0.FRACTION_BITS) */
uint32_t m_step; /* per-sample VCO step (0.FRACTION_BITS) */
uint32_t m_filter_position; /* current filter frequency position (0.FRACTION_BITS) */
uint32_t m_filter_step; /* per-sample filter step (0.FRACTION_BITS) */
uint32_t m_modulation_depth; /* fraction of total by which we modulate (0.FRACTION_BITS) */
int16_t m_last_ext; /* last external sample we read */
uint32_t m_pulse_width; /* fractional pulse width (0.FRACTION_BITS) */
double m_inv_sample_rate;
int m_sample_rate;
std::unique_ptr<int16_t[]> m_mixer_buffer;
std::unique_ptr<int16_t[]> m_external_buffer;
};
DECLARE_DEVICE_TYPE(CEM3394, cem3394_device)
#endif // MAME_SOUND_CEM3394_H
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