| 1 |
cebix |
1.1 |
/* |
| 2 |
|
|
* SID.h - 6581 emulation |
| 3 |
|
|
* |
| 4 |
cebix |
1.2 |
* Frodo (C) 1994-1997,2002-2003 Christian Bauer |
| 5 |
cebix |
1.1 |
* |
| 6 |
|
|
* This program is free software; you can redistribute it and/or modify |
| 7 |
|
|
* it under the terms of the GNU General Public License as published by |
| 8 |
|
|
* the Free Software Foundation; either version 2 of the License, or |
| 9 |
|
|
* (at your option) any later version. |
| 10 |
|
|
* |
| 11 |
|
|
* This program is distributed in the hope that it will be useful, |
| 12 |
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 |
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 |
|
|
* GNU General Public License for more details. |
| 15 |
|
|
* |
| 16 |
|
|
* You should have received a copy of the GNU General Public License |
| 17 |
|
|
* along with this program; if not, write to the Free Software |
| 18 |
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 19 |
|
|
*/ |
| 20 |
|
|
|
| 21 |
|
|
#ifndef _SID_H |
| 22 |
|
|
#define _SID_H |
| 23 |
|
|
|
| 24 |
|
|
#include <stdlib.h> |
| 25 |
|
|
|
| 26 |
|
|
|
| 27 |
|
|
// Define this if you want an emulation of an 8580 |
| 28 |
|
|
// (affects combined waveforms) |
| 29 |
|
|
#undef EMUL_MOS8580 |
| 30 |
|
|
|
| 31 |
|
|
|
| 32 |
|
|
class Prefs; |
| 33 |
|
|
class C64; |
| 34 |
|
|
class SIDRenderer; |
| 35 |
|
|
struct MOS6581State; |
| 36 |
|
|
|
| 37 |
|
|
// Class for administrative functions |
| 38 |
|
|
class MOS6581 { |
| 39 |
|
|
public: |
| 40 |
|
|
MOS6581(C64 *c64); |
| 41 |
|
|
~MOS6581(); |
| 42 |
|
|
|
| 43 |
|
|
void Reset(void); |
| 44 |
|
|
uint8 ReadRegister(uint16 adr); |
| 45 |
|
|
void WriteRegister(uint16 adr, uint8 byte); |
| 46 |
|
|
void NewPrefs(Prefs *prefs); |
| 47 |
|
|
void PauseSound(void); |
| 48 |
|
|
void ResumeSound(void); |
| 49 |
|
|
void GetState(MOS6581State *ss); |
| 50 |
|
|
void SetState(MOS6581State *ss); |
| 51 |
|
|
void EmulateLine(void); |
| 52 |
|
|
|
| 53 |
|
|
private: |
| 54 |
|
|
void open_close_renderer(int old_type, int new_type); |
| 55 |
|
|
|
| 56 |
|
|
C64 *the_c64; // Pointer to C64 object |
| 57 |
|
|
SIDRenderer *the_renderer; // Pointer to current renderer |
| 58 |
|
|
uint8 regs[32]; // Copies of the 25 write-only SID registers |
| 59 |
|
|
uint8 last_sid_byte; // Last value written to SID |
| 60 |
|
|
}; |
| 61 |
|
|
|
| 62 |
|
|
|
| 63 |
|
|
// Renderers do the actual audio data processing |
| 64 |
|
|
class SIDRenderer { |
| 65 |
|
|
public: |
| 66 |
|
|
virtual ~SIDRenderer() {} |
| 67 |
|
|
virtual void Reset(void)=0; |
| 68 |
|
|
virtual void EmulateLine(void)=0; |
| 69 |
|
|
virtual void WriteRegister(uint16 adr, uint8 byte)=0; |
| 70 |
|
|
virtual void NewPrefs(Prefs *prefs)=0; |
| 71 |
|
|
virtual void Pause(void)=0; |
| 72 |
|
|
virtual void Resume(void)=0; |
| 73 |
|
|
}; |
| 74 |
|
|
|
| 75 |
|
|
|
| 76 |
|
|
// SID state |
| 77 |
|
|
struct MOS6581State { |
| 78 |
|
|
uint8 freq_lo_1; |
| 79 |
|
|
uint8 freq_hi_1; |
| 80 |
|
|
uint8 pw_lo_1; |
| 81 |
|
|
uint8 pw_hi_1; |
| 82 |
|
|
uint8 ctrl_1; |
| 83 |
|
|
uint8 AD_1; |
| 84 |
|
|
uint8 SR_1; |
| 85 |
|
|
|
| 86 |
|
|
uint8 freq_lo_2; |
| 87 |
|
|
uint8 freq_hi_2; |
| 88 |
|
|
uint8 pw_lo_2; |
| 89 |
|
|
uint8 pw_hi_2; |
| 90 |
|
|
uint8 ctrl_2; |
| 91 |
|
|
uint8 AD_2; |
| 92 |
|
|
uint8 SR_2; |
| 93 |
|
|
|
| 94 |
|
|
uint8 freq_lo_3; |
| 95 |
|
|
uint8 freq_hi_3; |
| 96 |
|
|
uint8 pw_lo_3; |
| 97 |
|
|
uint8 pw_hi_3; |
| 98 |
|
|
uint8 ctrl_3; |
| 99 |
|
|
uint8 AD_3; |
| 100 |
|
|
uint8 SR_3; |
| 101 |
|
|
|
| 102 |
|
|
uint8 fc_lo; |
| 103 |
|
|
uint8 fc_hi; |
| 104 |
|
|
uint8 res_filt; |
| 105 |
|
|
uint8 mode_vol; |
| 106 |
|
|
|
| 107 |
|
|
uint8 pot_x; |
| 108 |
|
|
uint8 pot_y; |
| 109 |
|
|
uint8 osc_3; |
| 110 |
|
|
uint8 env_3; |
| 111 |
|
|
}; |
| 112 |
|
|
|
| 113 |
|
|
|
| 114 |
|
|
/* |
| 115 |
|
|
* Fill buffer (for Unix sound routines), sample volume (for sampled voice) |
| 116 |
|
|
*/ |
| 117 |
|
|
|
| 118 |
|
|
inline void MOS6581::EmulateLine(void) |
| 119 |
|
|
{ |
| 120 |
|
|
if (the_renderer != NULL) |
| 121 |
|
|
the_renderer->EmulateLine(); |
| 122 |
|
|
} |
| 123 |
|
|
|
| 124 |
|
|
|
| 125 |
|
|
/* |
| 126 |
|
|
* Read from register |
| 127 |
|
|
*/ |
| 128 |
|
|
|
| 129 |
|
|
inline uint8 MOS6581::ReadRegister(uint16 adr) |
| 130 |
|
|
{ |
| 131 |
|
|
// A/D converters |
| 132 |
|
|
if (adr == 0x19 || adr == 0x1a) { |
| 133 |
|
|
last_sid_byte = 0; |
| 134 |
|
|
return 0xff; |
| 135 |
|
|
} |
| 136 |
|
|
|
| 137 |
|
|
// Voice 3 oscillator/EG readout |
| 138 |
|
|
if (adr == 0x1b || adr == 0x1c) { |
| 139 |
|
|
last_sid_byte = 0; |
| 140 |
|
|
return rand(); |
| 141 |
|
|
} |
| 142 |
|
|
|
| 143 |
|
|
// Write-only register: Return last value written to SID |
| 144 |
|
|
return last_sid_byte; |
| 145 |
|
|
} |
| 146 |
|
|
|
| 147 |
|
|
|
| 148 |
|
|
/* |
| 149 |
|
|
* Write to register |
| 150 |
|
|
*/ |
| 151 |
|
|
|
| 152 |
|
|
inline void MOS6581::WriteRegister(uint16 adr, uint8 byte) |
| 153 |
|
|
{ |
| 154 |
|
|
// Keep a local copy of the register values |
| 155 |
|
|
last_sid_byte = regs[adr] = byte; |
| 156 |
|
|
|
| 157 |
|
|
if (the_renderer != NULL) |
| 158 |
|
|
the_renderer->WriteRegister(adr, byte); |
| 159 |
|
|
} |
| 160 |
|
|
|
| 161 |
|
|
#endif |
