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// license:BSD-3-Clause
// copyright-holders:Aaron Giles
/*********************************************************

    Konami 054539 PCM Sound Chip

*********************************************************/

#ifndef MAME_SOUND_K054539_H
#define MAME_SOUND_K054539_H

#pragma once

#define K054539_CB_MEMBER(_name)   void _name(double left, double right)

#define MCFG_K054539_APAN_CB(_class, _method) \
	downcast<k054539_device &>(*device).set_analog_callback(k054539_device::cb_delegate(&_class::_method, #_class "::" #_method, this));

#define MCFG_K054539_REGION_OVERRRIDE(_region) \
	downcast<k054539_device &>(*device).set_override("^" _region);

#define MCFG_K054539_TIMER_HANDLER(_devcb) \
	downcast<k054539_device &>(*device).set_timer_handler(DEVCB_##_devcb);


class k054539_device : public device_t,
						public device_sound_interface,
						public device_rom_interface
{
public:
	// control flags, may be set at DRIVER_INIT().
	enum {
		RESET_FLAGS     = 0,
		REVERSE_STEREO  = 1,
		DISABLE_REVERB  = 2,
		UPDATE_AT_KEYON = 4
	};

	typedef device_delegate<void (double left, double right)> cb_delegate;

	// construction/destruction
	k054539_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);

	// configuration helpers
	template <typename Object> void set_analog_callback(Object &&cb) { m_apan_cb = std::forward<Object>(cb); }
	template <class Object> devcb_base &set_timer_handler(Object &&cb) { return m_timer_handler.set_callback(std::forward<Object>(cb)); }


	DECLARE_WRITE8_MEMBER(write);
	DECLARE_READ8_MEMBER(read);

	void init_flags(int flags);

	/*
	  Note that the eight PCM channels of a K054539 do not have separate
	  volume controls. Considering the global attenuation equation may not
	  be entirely accurate, k054539_set_gain() provides means to control
	  channel gain. It can be called anywhere but preferably from
	  DRIVER_INIT().

	  Parameters:
	      channel : 0 - 7
	      gain    : 0.0=silent, 1.0=no gain, 2.0=twice as loud, etc.
	*/
	void set_gain(int channel, double gain);

protected:
	// device-level overrides
	virtual void device_start() override;
	virtual void device_reset() override;
	virtual void device_post_load() override;
	virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr) override;

	// device_sound_interface overrides
	virtual void sound_stream_update(sound_stream &stream, stream_sample_t **inputs, stream_sample_t **outputs, int samples) override;

	// device_rom_interface overrides
	virtual void rom_bank_updated() override;

private:
	struct channel {
		uint32_t pos;
		uint32_t pfrac;
		int32_t val;
		int32_t pval;
	};

	double voltab[256];
	double pantab[0xf];

	double gain[8];
	uint8_t posreg_latch[8][3];
	int flags;

	unsigned char regs[0x230];
	std::unique_ptr<uint8_t[]> ram;
	int reverb_pos;

	int32_t cur_ptr;
	int cur_limit;
	uint32_t rom_addr;

	channel channels[8];
	sound_stream *stream;

	emu_timer          *m_timer;
	uint32_t             m_timer_state;
	devcb_write_line   m_timer_handler;
	cb_delegate m_apan_cb;

	bool regupdate();
	void keyon(int channel);
	void keyoff(int channel);
	void init_chip();
};

DECLARE_DEVICE_TYPE(K054539, k054539_device)

#endif // MAME_SOUND_K054539_H