| 1 | /* FCE Ultra - NES/Famicom Emulator |
| 2 | * |
| 3 | * Copyright notice for this file: |
| 4 | * Copyright (C) 2002 Ben Parnell |
| 5 | * |
| 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 | #include "mapinc.h" |
| 22 | static void AYSound(int Count); |
| 23 | static void DoAYSQ(int x); |
| 24 | static void DoAYNoise(void); |
| 25 | |
| 26 | #define sunselect mapbyte1[0] |
| 27 | #define sungah mapbyte1[1] |
| 28 | #define sunindex mapbyte1[2] |
| 29 | |
| 30 | static uint16 znreg; |
| 31 | static int32 inc; |
| 32 | |
| 33 | DECLFW(SUN5BWRAM) |
| 34 | { |
| 35 | if((sungah&0xC0)==0xC0) |
| 36 | (WRAM-0x6000)[A]=V; |
| 37 | } |
| 38 | |
| 39 | DECLFR(SUN5AWRAM) |
| 40 | { |
| 41 | if((sungah&0xC0)==0x40) |
| 42 | return X.DB; |
| 43 | return CartBR(A); |
| 44 | } |
| 45 | |
| 46 | DECLFW(Mapper69_SWL) |
| 47 | { |
| 48 | sunindex=V%14; |
| 49 | } |
| 50 | DECLFW(Mapper69_SWH) |
| 51 | { |
| 52 | GameExpSound.Fill=AYSound; |
| 53 | switch(sunindex) |
| 54 | { |
| 55 | case 0: |
| 56 | case 1: |
| 57 | case 8:DoAYSQ(0);break; |
| 58 | case 2: |
| 59 | case 3: |
| 60 | case 9:DoAYSQ(1);break; |
| 61 | case 4: |
| 62 | case 5: |
| 63 | case 10:DoAYSQ(2);break; |
| 64 | case 6:DoAYNoise();znreg=0xFFFF;break; |
| 65 | case 7:DoAYNoise(); |
| 66 | DoAYSQ(0); |
| 67 | DoAYSQ(1); |
| 68 | DoAYSQ(2);break; |
| 69 | } |
| 70 | MapperExRAM[sunindex]=V; |
| 71 | } |
| 72 | |
| 73 | DECLFW(Mapper69_write) |
| 74 | { |
| 75 | switch(A&0xE000) |
| 76 | { |
| 77 | case 0x8000:sunselect=V;break; |
| 78 | case 0xa000: |
| 79 | sunselect&=0xF; |
| 80 | if(sunselect<=7) |
| 81 | VROM_BANK1(sunselect<<10,V); |
| 82 | else |
| 83 | switch(sunselect&0x0f) |
| 84 | { |
| 85 | case 8: |
| 86 | sungah=V; |
| 87 | if(V&0x40) |
| 88 | { |
| 89 | if(V&0x80) // Select WRAM |
| 90 | setprg8r(0x10,0x6000,0); |
| 91 | } |
| 92 | else |
| 93 | setprg8(0x6000,V); |
| 94 | break; |
| 95 | case 9:ROM_BANK8(0x8000,V);break; |
| 96 | case 0xa:ROM_BANK8(0xa000,V);break; |
| 97 | case 0xb:ROM_BANK8(0xc000,V);break; |
| 98 | case 0xc: |
| 99 | switch(V&3) |
| 100 | { |
| 101 | case 0:MIRROR_SET2(1);break; |
| 102 | case 1:MIRROR_SET2(0);break; |
| 103 | case 2:onemir(0);break; |
| 104 | case 3:onemir(1);break; |
| 105 | } |
| 106 | break; |
| 107 | case 0xd:IRQa=V;break; |
| 108 | case 0xe:IRQCount&=0xFF00;IRQCount|=V;break; |
| 109 | case 0xf:IRQCount&=0x00FF;IRQCount|=V<<8;break; |
| 110 | } |
| 111 | break; |
| 112 | } |
| 113 | } |
| 114 | |
| 115 | static int32 vcount[4]; |
| 116 | static int CAYBC[4]={0,0,0,0}; |
| 117 | static void DoAYSQ(int x) |
| 118 | { |
| 119 | int V; |
| 120 | uint32 freq; |
| 121 | unsigned char amp; |
| 122 | int32 start,end; |
| 123 | |
| 124 | start=CAYBC[x]; |
| 125 | end=(timestamp<<16)/soundtsinc; |
| 126 | if(end<=start) return; |
| 127 | CAYBC[x]=end; |
| 128 | |
| 129 | if(!(MapperExRAM[0x7]&(1<<x))) |
| 130 | { |
| 131 | long vcoo; |
| 132 | freq=(MapperExRAM[x<<1]|((MapperExRAM[(x<<1)+1]&15)<<8))+1; |
| 133 | inc=(long double)((unsigned long)((FSettings.SndRate OVERSAMPLE)<<12))/ |
| 134 | ((long double)PSG_base/freq); |
| 135 | amp=MapperExRAM[0x8+x]&15; |
| 136 | amp<<=3; |
| 137 | vcoo=vcount[x]; |
| 138 | if(amp) |
| 139 | for(V=start;V<end;V++) |
| 140 | { |
| 141 | if(vcoo<(inc>>1)) |
| 142 | Wave[V>>4]+=amp; |
| 143 | vcoo+=0x1000; |
| 144 | if(vcoo>=inc) vcoo-=inc; |
| 145 | } |
| 146 | vcount[x]=vcoo; |
| 147 | } |
| 148 | } |
| 149 | static void DoAYNoise(void) |
| 150 | { |
| 151 | int V; |
| 152 | uint32 freq; |
| 153 | unsigned char amp; |
| 154 | int32 start,end; |
| 155 | |
| 156 | start=CAYBC[3]; |
| 157 | end=(timestamp<<16)/soundtsinc; |
| 158 | if(end<=start) return; |
| 159 | CAYBC[3]=end; |
| 160 | |
| 161 | amp=0; |
| 162 | for(V=0;V<3;V++) |
| 163 | { |
| 164 | if(!(MapperExRAM[0x7]&(8<<V))) |
| 165 | { |
| 166 | //if(MapperExRAM[0x8+V]&0x10) amp+=MapperExRAM[0x20]&15; |
| 167 | //else |
| 168 | amp+=MapperExRAM[0x8+V]&15; |
| 169 | } |
| 170 | } |
| 171 | amp<<=3; |
| 172 | |
| 173 | if(amp) |
| 174 | { |
| 175 | freq=PSG_base/(MapperExRAM[0x6]+1); |
| 176 | if(freq>44100) |
| 177 | inc=((freq<<11)/(FSettings.SndRate OVERSAMPLE))<<4; |
| 178 | else |
| 179 | inc=(freq<<15)/(FSettings.SndRate OVERSAMPLE); |
| 180 | |
| 181 | for(V=start;V<end;V++) |
| 182 | { |
| 183 | static uint32 mixer; |
| 184 | |
| 185 | if(vcount[3]>=32768) |
| 186 | { |
| 187 | unsigned char feedback; |
| 188 | mixer=0; |
| 189 | if(znreg&1) mixer+=amp; |
| 190 | feedback=((znreg>>13)&1)^((znreg>>14)&1); |
| 191 | znreg=(znreg<<1)+(feedback); |
| 192 | vcount[3]-=32768; |
| 193 | } |
| 194 | Wave[V>>4]+=mixer; |
| 195 | vcount[3]+=inc; |
| 196 | } |
| 197 | } |
| 198 | |
| 199 | |
| 200 | } |
| 201 | static void AYSound(int Count) |
| 202 | { |
| 203 | int x; |
| 204 | DoAYSQ(0); |
| 205 | DoAYSQ(1); |
| 206 | DoAYSQ(2); |
| 207 | DoAYNoise(); |
| 208 | for(x=0;x<4;x++) |
| 209 | CAYBC[x]=Count; |
| 210 | } |
| 211 | |
| 212 | static void FP_FASTAPASS(1) SunIRQHook(int a) |
| 213 | { |
| 214 | if(IRQa) |
| 215 | { |
| 216 | IRQCount-=a; |
| 217 | if(IRQCount<=0) |
| 218 | {TriggerIRQ();IRQa=0;IRQCount=0xFFFF;} |
| 219 | } |
| 220 | } |
| 221 | |
| 222 | void Mapper69_StateRestore(int version) |
| 223 | { |
| 224 | if(version>=19) |
| 225 | { |
| 226 | if(mapbyte1[1]&0x40) |
| 227 | { |
| 228 | if(mapbyte1[1]&0x80) // Select WRAM |
| 229 | setprg8r(0x10,0x6000,0); |
| 230 | } |
| 231 | else |
| 232 | setprg8(0x6000,mapbyte1[1]); |
| 233 | } |
| 234 | else |
| 235 | mapbyte1[1]=0xC0; |
| 236 | } |
| 237 | |
| 238 | static void M69SC(void) |
| 239 | { |
| 240 | if(FSettings.SndRate) |
| 241 | Mapper69_ESI(); |
| 242 | else |
| 243 | SetWriteHandler(0xc000,0xffff,(writefunc)0); |
| 244 | } |
| 245 | |
| 246 | void Mapper69_ESI(void) |
| 247 | { |
| 248 | GameExpSound.RChange=M69SC; |
| 249 | if(FSettings.SndRate) |
| 250 | { |
| 251 | SetWriteHandler(0xc000,0xdfff,Mapper69_SWL); |
| 252 | SetWriteHandler(0xe000,0xffff,Mapper69_SWH); |
| 253 | } |
| 254 | } |
| 255 | |
| 256 | void Mapper69_init(void) |
| 257 | { |
| 258 | SetupCartPRGMapping(0x10,WRAM,8192,1); |
| 259 | |
| 260 | SetWriteHandler(0x8000,0xbfff,Mapper69_write); |
| 261 | SetWriteHandler(0x6000,0x7fff,SUN5BWRAM); |
| 262 | SetReadHandler(0x6000,0x7fff,SUN5AWRAM); |
| 263 | Mapper69_ESI(); |
| 264 | MapIRQHook=SunIRQHook; |
| 265 | MapStateRestore=Mapper69_StateRestore; |
| 266 | znreg=0; |
| 267 | } |
| 268 | |