c0e9b48b5b
SAA1099 (SAASound and MAME), Lynx, MMC5, N163, PC Engine, PC Speaker, PET, QSound, WonderSwan, VERA, VIC-20, VRC6 and X1-010!
134 lines
2.4 KiB
C++
134 lines
2.4 KiB
C++
/*
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License: BSD-3-Clause
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see https://github.com/cam900/vgsound_emu/LICENSE for more details
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Copyright holders: cam900
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Seta/Allumer X1-010 Emulation core
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See x1_010.cpp for more info.
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*/
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#include <algorithm>
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#include <memory>
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#ifndef _VGSOUND_EMU_X1_010_HPP
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#define _VGSOUND_EMU_X1_010_HPP
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#pragma once
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namespace x1_010
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{
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typedef unsigned char u8;
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typedef unsigned short u16;
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typedef unsigned int u32;
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typedef signed char s8;
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typedef signed int s32;
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template<typename T> T bitfield(T in, u8 pos, u8 len = 1)
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{
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return (in >> pos) & (len ? (T(1 << len) - 1) : 1);
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}
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}
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using namespace x1_010;
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class x1_010_mem_intf
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{
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public:
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virtual u8 read_byte(u32 address) { return 0; }
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};
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using namespace x1_010;
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class x1_010_core
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{
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friend class x1_010_mem_intf;
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public:
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// constructor
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x1_010_core(x1_010_mem_intf &intf)
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: m_voice{*this,*this,*this,*this,
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*this,*this,*this,*this,
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*this,*this,*this,*this,
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*this,*this,*this,*this}
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, m_intf(intf)
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{
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m_envelope = std::make_unique<u8[]>(0x1000);
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m_wave = std::make_unique<u8[]>(0x1000);
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std::fill_n(&m_envelope[0], 0x1000, 0);
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std::fill_n(&m_wave[0], 0x1000, 0);
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}
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// register accessor
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u8 ram_r(u16 offset);
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void ram_w(u16 offset, u8 data);
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// getters
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s32 output(u8 channel) { return m_out[channel & 1]; }
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s32 chan_out(u8 channel) { return (m_voice[channel].data * (m_voice[channel].vol_out[0]+m_voice[channel].vol_out[1]))<<2; }
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// internal state
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void reset();
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void tick();
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private:
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// 16 voices in chip
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struct voice_t
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{
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// constructor
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voice_t(x1_010_core &host) : m_host(host) {}
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// internal state
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void reset();
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void tick();
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// register accessor
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u8 reg_r(u8 offset);
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void reg_w(u8 offset, u8 data);
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// registers
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x1_010_core &m_host;
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struct flag_t
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{
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u8 div : 1;
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u8 env_oneshot : 1;
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u8 wavetable : 1;
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u8 keyon : 1;
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void reset()
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{
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div = 0;
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env_oneshot = 0;
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wavetable = 0;
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keyon = 0;
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}
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flag_t()
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: div(0)
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, env_oneshot(0)
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, wavetable(0)
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, keyon(0)
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{ }
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};
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flag_t flag;
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u8 vol_wave = 0;
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u16 freq = 0;
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u8 start_envfreq = 0;
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u8 end_envshape = 0;
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// internal registers
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u32 acc = 0;
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u32 env_acc = 0;
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s8 data = 0;
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u8 vol_out[2] = {0};
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};
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voice_t m_voice[16];
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// RAM
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std::unique_ptr<u8[]> m_envelope = nullptr;
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std::unique_ptr<u8[]> m_wave = nullptr;
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// output data
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s32 m_out[2] = {0};
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x1_010_mem_intf &m_intf;
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};
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#endif
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