mirror of
https://github.com/Oibaf66/frodo-wii.git
synced 2024-11-10 21:55:11 +01:00
159 lines
3.2 KiB
C++
159 lines
3.2 KiB
C++
/*
|
|
* SID.h - 6581 emulation
|
|
*
|
|
* Frodo (C) 1994-1997,2002-2005 Christian Bauer
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
|
|
#ifndef _SID_H
|
|
#define _SID_H
|
|
|
|
#include <stdlib.h>
|
|
|
|
|
|
// Define this if you want an emulation of an 8580
|
|
// (affects combined waveforms)
|
|
#undef EMUL_MOS8580
|
|
|
|
|
|
class Prefs;
|
|
class C64;
|
|
class SIDRenderer;
|
|
struct MOS6581State;
|
|
|
|
// Class for administrative functions
|
|
class MOS6581 {
|
|
public:
|
|
MOS6581(C64 *c64);
|
|
~MOS6581();
|
|
|
|
void Reset(void);
|
|
uint8 ReadRegister(uint16 adr);
|
|
void WriteRegister(uint16 adr, uint8 byte);
|
|
void NewPrefs(Prefs *prefs);
|
|
void PauseSound(void);
|
|
void ResumeSound(void);
|
|
void GetState(MOS6581State *ss);
|
|
void SetState(MOS6581State *ss);
|
|
void EmulateLine(void);
|
|
void PushVolume(uint8); /* For the network */
|
|
|
|
private:
|
|
void open_close_renderer(int old_type, int new_type);
|
|
|
|
C64 *the_c64; // Pointer to C64 object
|
|
SIDRenderer *the_renderer; // Pointer to current renderer
|
|
uint8 regs[32]; // Copies of the 25 write-only SID registers
|
|
uint8 last_sid_byte; // Last value written to SID
|
|
};
|
|
|
|
|
|
// Renderers do the actual audio data processing
|
|
class SIDRenderer {
|
|
public:
|
|
virtual ~SIDRenderer() {}
|
|
virtual void Reset(void)=0;
|
|
virtual void EmulateLine(void)=0;
|
|
virtual void PushVolume(uint8)=0;
|
|
virtual void WriteRegister(uint16 adr, uint8 byte)=0;
|
|
virtual void NewPrefs(Prefs *prefs)=0;
|
|
virtual void Pause(void)=0;
|
|
virtual void Resume(void)=0;
|
|
};
|
|
|
|
|
|
// SID state
|
|
struct MOS6581State {
|
|
uint8 freq_lo_1;
|
|
uint8 freq_hi_1;
|
|
uint8 pw_lo_1;
|
|
uint8 pw_hi_1;
|
|
uint8 ctrl_1;
|
|
uint8 AD_1;
|
|
uint8 SR_1;
|
|
|
|
uint8 freq_lo_2;
|
|
uint8 freq_hi_2;
|
|
uint8 pw_lo_2;
|
|
uint8 pw_hi_2;
|
|
uint8 ctrl_2;
|
|
uint8 AD_2;
|
|
uint8 SR_2;
|
|
|
|
uint8 freq_lo_3;
|
|
uint8 freq_hi_3;
|
|
uint8 pw_lo_3;
|
|
uint8 pw_hi_3;
|
|
uint8 ctrl_3;
|
|
uint8 AD_3;
|
|
uint8 SR_3;
|
|
|
|
uint8 fc_lo;
|
|
uint8 fc_hi;
|
|
uint8 res_filt;
|
|
uint8 mode_vol;
|
|
|
|
uint8 pot_x;
|
|
uint8 pot_y;
|
|
uint8 osc_3;
|
|
uint8 env_3;
|
|
};
|
|
|
|
|
|
inline void MOS6581::PushVolume(uint8 vol)
|
|
{
|
|
if (the_renderer != NULL)
|
|
the_renderer->PushVolume(vol);
|
|
}
|
|
|
|
/*
|
|
* Read from register
|
|
*/
|
|
|
|
inline uint8 MOS6581::ReadRegister(uint16 adr)
|
|
{
|
|
// A/D converters
|
|
if (adr == 0x19 || adr == 0x1a) {
|
|
last_sid_byte = 0;
|
|
return 0xff;
|
|
}
|
|
|
|
// Voice 3 oscillator/EG readout
|
|
if (adr == 0x1b || adr == 0x1c) {
|
|
last_sid_byte = 0;
|
|
return rand();
|
|
}
|
|
|
|
// Write-only register: Return last value written to SID
|
|
return last_sid_byte;
|
|
}
|
|
|
|
|
|
/*
|
|
* Write to register
|
|
*/
|
|
|
|
inline void MOS6581::WriteRegister(uint16 adr, uint8 byte)
|
|
{
|
|
// Keep a local copy of the register values
|
|
last_sid_byte = regs[adr] = byte;
|
|
|
|
if (the_renderer != NULL)
|
|
the_renderer->WriteRegister(adr, byte);
|
|
}
|
|
|
|
#endif
|