105 lines
3.4 KiB
C++
105 lines
3.4 KiB
C++
// license:BSD-3-Clause
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// copyright-holders:Aaron Giles
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/**********************************************************************************************
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*
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* Yamaha YMZ280B driver
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* by Aaron Giles
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*
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**********************************************************************************************/
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#include <memory>
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#ifndef MAME_SOUND_YMZ280B_H
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#define MAME_SOUND_YMZ280B_H
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#pragma once
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namespace ymz280b
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{
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typedef unsigned char u8;
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typedef signed char s8;
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typedef unsigned short u16;
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typedef signed short s16;
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typedef unsigned int u32;
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typedef signed int s32;
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typedef signed int offs_t;
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}
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using namespace ymz280b;
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class ymz280b_device
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{
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public:
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ymz280b_device();
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u8 read(offs_t offset);
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void write(offs_t offset, u8 data);
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void device_start(u8 *ext_mem);
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void device_reset();
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void sound_stream_update(s16 **outputs, int samples);
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private:
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/* struct describing a single playing ADPCM voice */
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struct YMZ280BVoice
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{
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u8 playing; /* 1 if we are actively playing */
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bool ended; /* indicate voice has ended in case samples_left is 0 */
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u8 keyon; /* 1 if the key is on */
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u8 looping; /* 1 if looping is enabled */
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u8 mode; /* current playback mode */
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u16 fnum; /* frequency */
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u8 level; /* output level */
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u8 pan; /* panning */
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u32 start; /* start address, in nibbles */
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u32 stop; /* stop address, in nibbles */
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u32 loop_start; /* loop start address, in nibbles */
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u32 loop_end; /* loop end address, in nibbles */
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u32 position; /* current position, in nibbles */
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s32 signal; /* current ADPCM signal */
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s32 step; /* current ADPCM step */
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s32 loop_signal; /* signal at loop start */
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s32 loop_step; /* step at loop start */
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u32 loop_count; /* number of loops so far */
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s32 output_left; /* output volume (left) */
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s32 output_right; /* output volume (right) */
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s32 output_step; /* step value for frequency conversion */
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s32 output_pos; /* current fractional position */
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s16 last_sample; /* last sample output */
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s16 curr_sample; /* current sample target */
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u8 irq_schedule; /* 1 if the IRQ state is updated by timer */
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};
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void update_step(struct YMZ280BVoice *voice);
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void update_volumes(struct YMZ280BVoice *voice);
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int generate_adpcm(struct YMZ280BVoice *voice, s16 *buffer, int samples);
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int generate_pcm8(struct YMZ280BVoice *voice, s16 *buffer, int samples);
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int generate_pcm16(struct YMZ280BVoice *voice, s16 *buffer, int samples);
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void write_to_register(int data);
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int compute_status();
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// internal state
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struct YMZ280BVoice m_voice[8]; /* the 8 voices */
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u8 m_current_register; /* currently accessible register */
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u8 m_status_register; /* current status register */
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u8 m_irq_mask; /* current IRQ mask */
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u8 m_irq_enable; /* current IRQ enable */
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u8 m_keyon_enable; /* key on enable */
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u8 m_ext_mem_enable; /* external memory enable */
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u8 m_ext_readlatch; /* external memory prefetched data */
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u32 m_ext_mem_address_hi;
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u32 m_ext_mem_address_mid;
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u32 m_ext_mem_address; /* where the CPU can read the ROM */
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u8 *m_ext_mem;
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std::unique_ptr<s16[]> m_scratch;
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};
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#endif // MAME_SOUND_YMZ280B_H
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