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