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// license:BSD-3-Clause
// copyright-holders:Fabio Priuli,Philip Bennett
/*****************************************************************************
MB87078 6-bit,4-channel electronic volume controller emulator
*****************************************************************************/
#ifndef MAME_MACHINE_MB87078_H
#define MAME_MACHINE_MB87078_H
#pragma once
/***************************************************************************
DEVICE CONFIGURATION MACROS
***************************************************************************/
#define MCFG_MB87078_GAIN_CHANGED_CB(_devcb) \
devcb = &downcast<mb87078_device &>(*device).set_gain_changed_callback(DEVCB_##_devcb);
/***************************************************************************
TYPE DEFINITIONS
***************************************************************************/
class mb87078_device : public device_t
{
public:
mb87078_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
template <class Object> devcb_base &set_gain_changed_callback(Object &&cb) { return m_gain_changed_cb.set_callback(std::forward<Object>(cb)); }
void data_w(int data, int dsel);
void reset_comp_w(int level);
/* gain_decibel_r will return 'channel' gain on the device.
Returned value represents channel gain expressed in decibels,
Range from 0 to -32.0 (or -256.0 for -infinity) */
float gain_decibel_r(int channel);
/* gain_percent_r will return 'channel' gain on the device.
Returned value represents channel gain expressed in percents of maximum volume.
Range from 100 to 0. (100 = 0dB; 50 = -6dB; 0 = -infinity)
This function is designed for use with MAME mixer_xxx() functions. */
int gain_percent_r(int channel);
void gain_recalc();
protected:
// device-level overrides
virtual void device_start() override;
virtual void device_reset() override;
private:
// internal state
int m_gain[4]; /* gain index 0-63,64,65 */
int m_channel_latch; /* current channel */
uint8_t m_latch[2][4]; /* 6bit+3bit 4 data latches */
uint8_t m_reset_comp;
devcb_write8 m_gain_changed_cb;
};
DECLARE_DEVICE_TYPE(MB87078, mb87078_device)
#endif // MAME_MACHINE_MB87078_H
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