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// license:BSD-3-Clause
// copyright-holders:Aaron Giles
/**********************************************************************************************
*
* Yamaha YMZ280B driver
* by Aaron Giles
*
**********************************************************************************************/
#ifndef MAME_SOUND_YMZ280B_H
#define MAME_SOUND_YMZ280B_H
#pragma once
#define YMZ280B_MAKE_WAVS 0
#define MCFG_YMZ280B_IRQ_HANDLER(_devcb) \
devcb = &downcast<ymz280b_device &>(*device).set_irq_handler(DEVCB_##_devcb);
class ymz280b_device : public device_t, public device_sound_interface, public device_rom_interface
{
public:
ymz280b_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
// configuration helpers
template <class Object> devcb_base &set_irq_handler(Object &&cb) { return m_irq_handler.set_callback(std::forward<Object>(cb)); }
DECLARE_READ8_MEMBER( read );
DECLARE_WRITE8_MEMBER( write );
protected:
// device-level overrides
virtual void device_start() override;
virtual void device_post_load() override;
virtual void device_reset() override;
virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr) override;
virtual void device_clock_changed() override;
// sound stream update 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 describing a single playing ADPCM voice */
struct YMZ280BVoice
{
uint8_t playing; /* 1 if we are actively playing */
bool ended; /* indicate voice has ended in case samples_left is 0 */
uint8_t keyon; /* 1 if the key is on */
uint8_t looping; /* 1 if looping is enabled */
uint8_t mode; /* current playback mode */
uint16_t fnum; /* frequency */
uint8_t level; /* output level */
uint8_t pan; /* panning */
uint32_t start; /* start address, in nibbles */
uint32_t stop; /* stop address, in nibbles */
uint32_t loop_start; /* loop start address, in nibbles */
uint32_t loop_end; /* loop end address, in nibbles */
uint32_t position; /* current position, in nibbles */
int32_t signal; /* current ADPCM signal */
int32_t step; /* current ADPCM step */
int32_t loop_signal; /* signal at loop start */
int32_t loop_step; /* step at loop start */
uint32_t loop_count; /* number of loops so far */
int32_t output_left; /* output volume (left) */
int32_t output_right; /* output volume (right) */
int32_t output_step; /* step value for frequency conversion */
int32_t output_pos; /* current fractional position */
int16_t last_sample; /* last sample output */
int16_t curr_sample; /* current sample target */
uint8_t irq_schedule; /* 1 if the IRQ state is updated by timer */
emu_timer *timer;
};
void update_irq_state();
void update_step(struct YMZ280BVoice *voice);
void update_volumes(struct YMZ280BVoice *voice);
void update_irq_state_timer_common(int voicenum);
int generate_adpcm(struct YMZ280BVoice *voice, int16_t *buffer, int samples);
int generate_pcm8(struct YMZ280BVoice *voice, int16_t *buffer, int samples);
int generate_pcm16(struct YMZ280BVoice *voice, int16_t *buffer, int samples);
void write_to_register(int data);
int compute_status();
// internal state
struct YMZ280BVoice m_voice[8]; /* the 8 voices */
uint8_t m_current_register; /* currently accessible register */
uint8_t m_status_register; /* current status register */
uint8_t m_irq_state; /* current IRQ state */
uint8_t m_irq_mask; /* current IRQ mask */
uint8_t m_irq_enable; /* current IRQ enable */
uint8_t m_keyon_enable; /* key on enable */
uint8_t m_ext_mem_enable; /* external memory enable */
uint8_t m_ext_readlatch; /* external memory prefetched data */
uint32_t m_ext_mem_address_hi;
uint32_t m_ext_mem_address_mid;
uint32_t m_ext_mem_address; /* where the CPU can read the ROM */
devcb_write_line m_irq_handler; /* IRQ callback */
double m_master_clock; /* master clock frequency */
sound_stream *m_stream; /* which stream are we using */
std::unique_ptr<int16_t[]> m_scratch;
#if YMZ280B_MAKE_WAVS
void *m_wavresample; /* resampled waveform */
#endif
};
DECLARE_DEVICE_TYPE(YMZ280B, ymz280b_device)
#endif // MAME_SOUND_YMZ280B_H
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