| 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 | |
| 23 | #define vrctemp mapbyte1[0] |
| 24 | #define regb000 mapbyte3[0] |
| 25 | #define regb001 mapbyte3[1] |
| 26 | #define regb002 mapbyte3[2] |
| 27 | #define exchstat mapbyte4[0] |
| 28 | #define VPSG2 mapbyte3 |
| 29 | #define VPSG mapbyte2 |
| 30 | |
| 31 | static void DoSQV1(void); |
| 32 | static void DoSQV2(void); |
| 33 | static void DoSawV(void); |
| 34 | |
| 35 | static int swaparoo; |
| 36 | static int32 inc; |
| 37 | static DECLFW(VRC6PSGW90) |
| 38 | { |
| 39 | DoSQV1();VPSG[0]=V; |
| 40 | } |
| 41 | static DECLFW(VRC6PSGW91) |
| 42 | { |
| 43 | DoSQV1();VPSG[2]=V; |
| 44 | } |
| 45 | static DECLFW(VRC6PSGW92) |
| 46 | { |
| 47 | DoSQV1();VPSG[3]=V; |
| 48 | } |
| 49 | static DECLFW(VRC6PSGWA0) |
| 50 | { |
| 51 | DoSQV2();VPSG[4]=V; |
| 52 | } |
| 53 | static DECLFW(VRC6PSGWA1) |
| 54 | { |
| 55 | DoSQV2();VPSG[6]=V; |
| 56 | } |
| 57 | static DECLFW(VRC6PSGWA2) |
| 58 | { |
| 59 | DoSQV2();VPSG[7]=V; |
| 60 | } |
| 61 | static DECLFW(VRC6PSGWB0) |
| 62 | { |
| 63 | DoSawV();VPSG2[0]=V; |
| 64 | } |
| 65 | static DECLFW(VRC6PSGWB1) |
| 66 | { |
| 67 | DoSawV();VPSG2[1]=V; |
| 68 | } |
| 69 | static DECLFW(VRC6PSGWB2) |
| 70 | { |
| 71 | DoSawV();VPSG2[2]=V; |
| 72 | } |
| 73 | |
| 74 | static int acount=0; |
| 75 | |
| 76 | static void FP_FASTAPASS(1) KonamiIRQHook(int a) |
| 77 | { |
| 78 | #define LCYCS 114 |
| 79 | if(IRQa) |
| 80 | { |
| 81 | acount+=a; |
| 82 | if(acount>=LCYCS) |
| 83 | { |
| 84 | doagainbub:acount-=LCYCS;IRQCount++; |
| 85 | if(IRQCount==0x100) {TriggerIRQ();IRQCount=IRQLatch;} |
| 86 | if(acount>=LCYCS) goto doagainbub; |
| 87 | } |
| 88 | } |
| 89 | } |
| 90 | |
| 91 | DECLFW(Mapper24_write) |
| 92 | { |
| 93 | if(swaparoo) |
| 94 | A=(A&0xFFFC)|((A>>1)&1)|((A<<1)&2); |
| 95 | |
| 96 | switch(A&0xF003) |
| 97 | { |
| 98 | case 0x8000:ROM_BANK16(0x8000,V); |
| 99 | X6502_Rebase();break; |
| 100 | case 0xB003: |
| 101 | switch(V&0xF) |
| 102 | { |
| 103 | case 0x0:MIRROR_SET2(1);break; |
| 104 | case 0x4:MIRROR_SET2(0);break; |
| 105 | case 0x8:onemir(0);break; |
| 106 | case 0xC:onemir(1);break; |
| 107 | } |
| 108 | break; |
| 109 | case 0xC000:ROM_BANK8(0xC000,V); |
| 110 | X6502_Rebase();break; |
| 111 | case 0xD000:VROM_BANK1(0x0000,V);break; |
| 112 | case 0xD001:VROM_BANK1(0x0400,V);break; |
| 113 | case 0xD002:VROM_BANK1(0x0800,V);break; |
| 114 | case 0xD003:VROM_BANK1(0x0c00,V);break; |
| 115 | case 0xE000:VROM_BANK1(0x1000,V);break; |
| 116 | case 0xE001:VROM_BANK1(0x1400,V);break; |
| 117 | case 0xE002:VROM_BANK1(0x1800,V);break; |
| 118 | case 0xE003:VROM_BANK1(0x1c00,V);break; |
| 119 | case 0xF000:IRQLatch=V;break; |
| 120 | case 0xF001:IRQa=V&2; |
| 121 | vrctemp=V&1; |
| 122 | if(V&2) {IRQCount=IRQLatch;} |
| 123 | //acount=0; |
| 124 | break; |
| 125 | case 0xf002:IRQa=vrctemp;break; |
| 126 | case 0xF003:break; |
| 127 | } |
| 128 | } |
| 129 | |
| 130 | static int CVBC[3]={0,0,0}; |
| 131 | static int32 vcount[2]; |
| 132 | |
| 133 | static void DoSQV1(void) |
| 134 | { |
| 135 | uint8 amp; |
| 136 | int32 freq; |
| 137 | int V; |
| 138 | int32 start,end; |
| 139 | |
| 140 | start=CVBC[0]; |
| 141 | end=(timestamp<<16)/soundtsinc; |
| 142 | if(end<=start) return; |
| 143 | CVBC[0]=end; |
| 144 | |
| 145 | if(VPSG[0x3]&0x80) |
| 146 | { |
| 147 | amp=(VPSG[0]&15)<<4; |
| 148 | if(VPSG[0]&0x80) |
| 149 | { |
| 150 | for(V=start;V<end;V++) |
| 151 | Wave[V>>4]+=amp; |
| 152 | } |
| 153 | else |
| 154 | { |
| 155 | unsigned long dcycs; |
| 156 | freq=(((VPSG[0x2]|((VPSG[0x3]&15)<<8))+1)); |
| 157 | inc=(long double)((unsigned long)((FSettings.SndRate OVERSAMPLE)<<12))/((long double)PSG_base/freq); |
| 158 | switch(VPSG[0]&0x70) |
| 159 | { |
| 160 | default: |
| 161 | case 0x00:dcycs=inc>>4;break; |
| 162 | case 0x10:dcycs=inc>>3;break; |
| 163 | case 0x20:dcycs=(inc*3)>>4;break; |
| 164 | case 0x30:dcycs=inc>>2;break; |
| 165 | case 0x40:dcycs=(inc*5)>>4;break; |
| 166 | case 0x50:dcycs=(inc*6)>>4;break; |
| 167 | case 0x60:dcycs=(inc*7)>>4;break; |
| 168 | case 0x70:dcycs=inc>>1;break; |
| 169 | } |
| 170 | for(V=start;V<end;V++) |
| 171 | { |
| 172 | if(vcount[0]<dcycs) |
| 173 | Wave[V>>4]+=amp; |
| 174 | vcount[0]+=0x1000; |
| 175 | if(vcount[0]>=inc) vcount[0]-=inc; |
| 176 | } |
| 177 | } |
| 178 | } |
| 179 | } |
| 180 | static void DoSQV2(void) |
| 181 | { |
| 182 | uint8 amp; |
| 183 | int32 freq; |
| 184 | int V; |
| 185 | int32 start,end; |
| 186 | |
| 187 | start=CVBC[1]; |
| 188 | end=(timestamp<<16)/soundtsinc; |
| 189 | if(end<=start) return; |
| 190 | CVBC[1]=end; |
| 191 | |
| 192 | if(VPSG[0x7]&0x80) |
| 193 | { |
| 194 | amp=(VPSG[4]&15)<<4; |
| 195 | if(VPSG[4]&0x80) |
| 196 | { |
| 197 | for(V=start;V<end;V++) |
| 198 | Wave[V>>4]+=amp; |
| 199 | } |
| 200 | else |
| 201 | { |
| 202 | unsigned long dcycs; |
| 203 | freq=(((VPSG[0x6]|((VPSG[0x7]&15)<<8))+1)); |
| 204 | inc=(long double)((unsigned long)((FSettings.SndRate OVERSAMPLE)<<12))/((long double)PSG_base/freq); |
| 205 | switch(VPSG[4]&0x70) |
| 206 | { |
| 207 | default: |
| 208 | case 0x00:dcycs=inc>>4;break; |
| 209 | case 0x10:dcycs=inc>>3;break; |
| 210 | case 0x20:dcycs=(inc*3)>>4;break; |
| 211 | case 0x30:dcycs=inc>>2;break; |
| 212 | case 0x40:dcycs=(inc*5)>>4;break; |
| 213 | case 0x50:dcycs=(inc*6)>>4;break; |
| 214 | case 0x60:dcycs=(inc*7)>>4;break; |
| 215 | case 0x70:dcycs=inc>>1;break; |
| 216 | } |
| 217 | for(V=start;V<end;V++) |
| 218 | { |
| 219 | if(vcount[1]<dcycs) |
| 220 | Wave[V>>4]+=amp; |
| 221 | vcount[1]+=0x1000; |
| 222 | if(vcount[1]>=inc) vcount[1]-=inc; |
| 223 | } |
| 224 | } |
| 225 | } |
| 226 | } |
| 227 | |
| 228 | static void DoSawV(void) |
| 229 | { |
| 230 | int V; |
| 231 | int32 start,end; |
| 232 | |
| 233 | start=CVBC[2]; |
| 234 | end=(timestamp<<16)/soundtsinc; |
| 235 | if(end<=start) return; |
| 236 | CVBC[2]=end; |
| 237 | |
| 238 | if(VPSG2[2]&0x80) |
| 239 | { |
| 240 | static int64 saw1phaseacc=0; |
| 241 | uint32 freq3; |
| 242 | static uint8 b3=0; |
| 243 | static int32 phaseacc=0; |
| 244 | static uint32 duff=0; |
| 245 | |
| 246 | freq3=(VPSG2[1]+((VPSG2[2]&15)<<8)+1); |
| 247 | |
| 248 | for(V=start;V<end;V++) |
| 249 | { |
| 250 | saw1phaseacc-=nesincsizeLL; |
| 251 | if(saw1phaseacc<=0) |
| 252 | { |
| 253 | int64 t; |
| 254 | rea: |
| 255 | t=freq3; |
| 256 | t<<=50; // 49 + 1 |
| 257 | saw1phaseacc+=t; |
| 258 | phaseacc+=VPSG2[0]&0x3f; |
| 259 | b3++; |
| 260 | if(b3==7) |
| 261 | { |
| 262 | b3=0; |
| 263 | phaseacc=0; |
| 264 | } |
| 265 | if(saw1phaseacc<=0) |
| 266 | goto rea; |
| 267 | duff=(((phaseacc>>3)&0x1f)<<4); |
| 268 | } |
| 269 | Wave[V>>4]+=duff; |
| 270 | } |
| 271 | } |
| 272 | } |
| 273 | |
| 274 | void VRC6Sound(int Count) |
| 275 | { |
| 276 | int x; |
| 277 | |
| 278 | DoSQV1(); |
| 279 | DoSQV2(); |
| 280 | DoSawV(); |
| 281 | for(x=0;x<3;x++) |
| 282 | CVBC[x]=Count; |
| 283 | } |
| 284 | |
| 285 | static int satype=0; |
| 286 | |
| 287 | void VRC6SoundC(void) |
| 288 | { |
| 289 | int x; |
| 290 | |
| 291 | if(FSettings.SndRate) |
| 292 | VRC6_ESI(satype); |
| 293 | else |
| 294 | { |
| 295 | for(x=000;x<0x1000;x+=4) |
| 296 | { |
| 297 | SetWriteHandler(0x9000+x,0x9002+x,0); |
| 298 | SetWriteHandler(0xa000+x,0xa002+x,0); |
| 299 | SetWriteHandler(0xb000+x,0xb002+x,0); |
| 300 | } |
| 301 | } |
| 302 | } |
| 303 | |
| 304 | void VRC6_ESI(int t) |
| 305 | { |
| 306 | int x; |
| 307 | |
| 308 | satype=t; |
| 309 | |
| 310 | GameExpSound.RChange=VRC6SoundC; |
| 311 | GameExpSound.Fill=VRC6Sound; |
| 312 | if(FSettings.SndRate) |
| 313 | for(x=000;x<0x1000;x+=4) |
| 314 | { |
| 315 | uint32 a; |
| 316 | |
| 317 | a=0x9000+x; |
| 318 | SetWriteHandler(a,a,VRC6PSGW90); |
| 319 | SetWriteHandler(a+(1^t),a+(1^t),VRC6PSGW91); |
| 320 | SetWriteHandler(a+(2^t),a+(2^t),VRC6PSGW92); |
| 321 | |
| 322 | a=0xa000+x; |
| 323 | SetWriteHandler(a,a,VRC6PSGWA0); |
| 324 | SetWriteHandler(a+(1^t),a+(1^t),VRC6PSGWA1); |
| 325 | SetWriteHandler(a+(2^t),a+(2^t),VRC6PSGWA2); |
| 326 | |
| 327 | a=0xb000+x; |
| 328 | SetWriteHandler(a,a,VRC6PSGWB0); |
| 329 | SetWriteHandler(a+(1^t),a+(1^t),VRC6PSGWB1); |
| 330 | SetWriteHandler(a+(2^t),a+(2^t),VRC6PSGWB2); |
| 331 | } |
| 332 | } |
| 333 | |
| 334 | void Mapper24_init(void) |
| 335 | { |
| 336 | SetWriteHandler(0x8000,0xffff,Mapper24_write); |
| 337 | if(FSettings.SndRate) |
| 338 | VRC6_ESI(0); |
| 339 | GameExpSound.RChange=VRC6SoundC; |
| 340 | MapIRQHook=KonamiIRQHook; |
| 341 | swaparoo=0; |
| 342 | } |
| 343 | |
| 344 | void Mapper26_init(void) |
| 345 | { |
| 346 | SetWriteHandler(0x8000,0xffff,Mapper24_write); |
| 347 | if(FSettings.SndRate) |
| 348 | VRC6_ESI(3); |
| 349 | GameExpSound.RChange=VRC6SoundC; |
| 350 | MapIRQHook=KonamiIRQHook; |
| 351 | swaparoo=1; |
| 352 | } |
| 353 | |