c0e9b48b5b
SAA1099 (SAASound and MAME), Lynx, MMC5, N163, PC Engine, PC Speaker, PET, QSound, WonderSwan, VERA, VIC-20, VRC6 and X1-010!
90 lines
1.8 KiB
C++
90 lines
1.8 KiB
C++
/*
|
|
License: BSD-3-Clause
|
|
see https://github.com/cam900/vgsound_emu/LICENSE for more details
|
|
|
|
Copyright holder(s): cam900
|
|
Namco 163 Sound emulation core
|
|
*/
|
|
|
|
#include <algorithm>
|
|
#include <memory>
|
|
|
|
#ifndef _VGSOUND_EMU_N163_HPP
|
|
#define _VGSOUND_EMU_N163_HPP
|
|
|
|
#pragma once
|
|
|
|
namespace n163
|
|
{
|
|
typedef unsigned char u8;
|
|
typedef unsigned short u16;
|
|
typedef unsigned int u32;
|
|
typedef signed short s16;
|
|
|
|
// get bitfield, bitfield(input, position, len)
|
|
template<typename T> T bitfield(T in, u8 pos, u8 len = 1)
|
|
{
|
|
return (in >> pos) & (len ? (T(1 << len) - 1) : 1);
|
|
}
|
|
};
|
|
|
|
using namespace n163;
|
|
class n163_core
|
|
{
|
|
public:
|
|
// accessors, getters, setters
|
|
void addr_w(u8 data);
|
|
void data_w(u8 data, bool cpu_access = false);
|
|
u8 data_r(bool cpu_access = false);
|
|
|
|
void set_disable(bool disable) { m_disable = disable; }
|
|
|
|
// internal state
|
|
void reset();
|
|
void tick();
|
|
|
|
// sound output pin
|
|
s16 out() { return m_out; }
|
|
|
|
// get channel output
|
|
s16 chan_out(u8 ch) { return m_ch_out[ch]; }
|
|
|
|
// get voice cycle
|
|
u8 voice_cycle() { return m_voice_cycle; }
|
|
|
|
// register pool
|
|
u8 reg(u8 addr) { return m_ram[addr & 0x7f]; }
|
|
void set_multiplex(bool multiplex = true) { m_multiplex = multiplex; }
|
|
|
|
private:
|
|
// Address latch
|
|
struct addr_latch_t
|
|
{
|
|
addr_latch_t()
|
|
: addr(0)
|
|
, incr(0)
|
|
{ };
|
|
|
|
void reset()
|
|
{
|
|
addr = 0;
|
|
incr = 0;
|
|
}
|
|
|
|
u8 addr : 7;
|
|
u8 incr : 1;
|
|
};
|
|
|
|
bool m_disable = false;
|
|
u8 m_ram[0x80] = {0}; // internal 128 byte RAM
|
|
u8 m_voice_cycle = 0x78; // Voice cycle for processing
|
|
addr_latch_t m_addr_latch; // address latch
|
|
s16 m_out = 0; // output
|
|
s16 m_ch_out[8] = {0}; // per channel output
|
|
// demultiplex related
|
|
bool m_multiplex = true; // multiplex flag, but less noisy = inaccurate!
|
|
s16 m_acc = 0; // accumulated output
|
|
};
|
|
|
|
#endif
|