16/ID_SD_A.ASM

   1 ;\r
   2 ;       ID_SD_A.ASM\r
   3 ;       Id Sound Manager assembly stuff\r
   4 \r
   5         .8086\r
   6         IDEAL\r
   7         MODEL   MEDIUM,C\r
   8         JUMPS\r
   9 \r
  10         INCLUDE 'ID_SD.EQU'\r
  11 \r
  12 DEBUG   =       0\r
  13 \r
  14         EXTRN   SDL_DigitizedDone:FAR\r
  15         EXTRN   alOut:FAR\r
  16 \r
  17 ;============================================================================\r
  18 \r
  19 DATASEG\r
  20 \r
  21         EXTRN   sqActive:WORD\r
  22         EXTRN   ssSample:DWORD\r
  23         EXTRN   ssLengthLeft:WORD\r
  24         EXTRN   ssControl:WORD\r
  25         EXTRN   ssStatus:WORD\r
  26         EXTRN   ssData:WORD\r
  27         EXTRN   ssOn:BYTE\r
  28         EXTRN   ssOff:BYTE\r
  29 \r
  30         EXTRN   pcSound:DWORD\r
  31         EXTRN   pcLengthLeft:WORD\r
  32         EXTRN   pcLastSample:BYTE\r
  33         EXTRN   pcSoundLookup:WORD\r
  34 \r
  35         EXTRN   alSound:DWORD\r
  36         EXTRN   alBlock:WORD\r
  37         EXTRN   alLengthLeft:WORD\r
  38         EXTRN   alTimeCount:DWORD\r
  39 \r
  40         EXTRN   sqHack:DWORD\r
  41         EXTRN   sqHackPtr:DWORD\r
  42         EXTRN   sqHackLen:WORD\r
  43         EXTRN   sqHackSeqLen:WORD\r
  44         EXTRN   sqHackTime:DWORD\r
  45 \r
  46         EXTRN   HackCount:WORD\r
  47         EXTRN   TimeCount:WORD\r
  48         EXTRN   LocalTime:WORD\r
  49 \r
  50         EXTRN   TimerCount:WORD\r
  51         EXTRN   TimerDivisor:WORD\r
  52         EXTRN   t0OldService:DWORD\r
  53 \r
  54         EXTRN   SoundMode:WORD\r
  55         EXTRN   DigiMode:WORD\r
  56 \r
  57         EXTRN   SoundNumber:WORD\r
  58         EXTRN   SoundPriority:WORD\r
  59 \r
  60 count_time      dw      ?\r
  61 count_fx        dw      ?\r
  62 \r
  63 pcdtab  db      00b,00b,00b,00b,00b,00b,00b,00b,00b,00b,00b,00b,00b,00b,00b,00b\r
  64                 db      00b,00b,00b,00b,00b,00b,00b,00b,00b,00b,00b,00b,00b,00b,00b,00b\r
  65                 db      00b,00b,00b,00b,00b,00b,00b,00b,00b,00b,00b,00b,00b,00b,00b,00b\r
  66                 db      00b,00b,00b,00b,00b,00b,00b,00b,00b,00b,00b,00b,00b,00b,00b,00b\r
  67                 db      00b,00b,00b,00b,00b,00b,00b,00b,00b,00b,00b,00b,00b,00b,00b,00b\r
  68                 db      00b,00b,00b,00b,00b,00b,00b,00b,00b,00b,00b,00b,00b,00b,00b,00b\r
  69                 db      00b,00b,00b,00b,00b,00b,00b,00b,00b,00b,00b,00b,00b,00b,00b,00b\r
  70                 db      00b,00b,00b,00b,00b,00b,00b,00b,00b,00b,00b,00b,00b,00b,00b,00b\r
  71                 db      10b,10b,10b,10b,10b,10b,10b,10b,10b,10b,10b,10b,10b,10b,10b,10b\r
  72                 db      10b,10b,10b,10b,10b,10b,10b,10b,10b,10b,10b,10b,10b,10b,10b,10b\r
  73                 db      10b,10b,10b,10b,10b,10b,10b,10b,10b,10b,10b,10b,10b,10b,10b,10b\r
  74                 db      10b,10b,10b,10b,10b,10b,10b,10b,10b,10b,10b,10b,10b,10b,10b,10b\r
  75                 db      10b,10b,10b,10b,10b,10b,10b,10b,10b,10b,10b,10b,10b,10b,10b,10b\r
  76                 db      10b,10b,10b,10b,10b,10b,10b,10b,10b,10b,10b,10b,10b,10b,10b,10b\r
  77                 db      10b,10b,10b,10b,10b,10b,10b,10b,10b,10b,10b,10b,10b,10b,10b,10b\r
  78                 db      10b,10b,10b,10b,10b,10b,10b,10b,10b,10b,10b,10b,10b,10b,10b,10b\r
  79 \r
  80 \r
  81 ;============================================================================\r
  82 \r
  83 CODESEG\r
  84 \r
  85 MyDS    dw      ?\r
  86 \r
  87 pcindicate      dw      ?\r
  88 extreme         dw      ?\r
  89 \r
  90         PROC    SDL_SetDS\r
  91         PUBLIC  SDL_SetDS\r
  92 \r
  93         mov     ax,ds\r
  94         mov     [cs:MyDS],ds\r
  95         ret\r
  96 \r
  97         ENDP\r
  98 \r
  99 ;\r
 100 ;       COMMONSTART\r
 101 ;       Macro used for common prefix code\r
 102 ;\r
 103         MACRO   COMMONSTART\r
 104         IF DEBUG\r
 105         push dx\r
 106         push ax\r
 107         mov     dx,STATUS_REGISTER_1\r
 108         in      al,dx\r
 109         mov     dx,ATR_INDEX\r
 110         mov     al,ATR_OVERSCAN\r
 111         out     dx,al\r
 112         mov     al,4    ; red\r
 113         out     dx,al\r
 114         ENDIF\r
 115 \r
 116         push ds\r
 117         push ax\r
 118 \r
 119         mov     ds,[cs:MyDS]\r
 120         inc     [HackCount]\r
 121         ENDM\r
 122 \r
 123 ;\r
 124 ;       DOFX\r
 125 ;       Macro used to do the sound effects code\r
 126 ;\r
 127         MACRO   DOFX\r
 128         les     di,[pcSound]                            ; PC sound effects\r
 129         mov     ax,es\r
 130         or      ax,di\r
 131         jz      @@nopc                                          ; nil pointer - no PC sound effect going\r
 132 \r
 133         mov     bl,[es:di]                                      ; Get the byte\r
 134         inc     [WORD PTR pcSound]                      ; Increment pointer\r
 135         cmp     [pcLastSample],bl                       ; Is this sample the same as last?\r
 136         jz      @@pcsame                                        ; Yep - don't do anything\r
 137         mov     [pcLastSample],bl                       ; No, save it for next time\r
 138 \r
 139         or      bl,bl\r
 140         jz      @@pcoff                                         ; If 0, turn sounds off\r
 141         xor     bh,bh\r
 142         shl     bx,1\r
 143         mov     bx,[pcSoundLookup+bx]           ; Use byte as index into frequency table\r
 144 \r
 145         mov     al,0b6h                                         ; Write to channel 2 (speaker) timer\r
 146         out     pcTAccess,al\r
 147         mov     al,bl\r
 148         out     pcTimer,al                                      ; Low byte\r
 149         mov     al,bh\r
 150         out     pcTimer,al                                      ; High byte\r
 151 \r
 152         in      al,pcSpeaker                            ; Turn the speaker & gate on\r
 153         or      al,3\r
 154         out     pcSpeaker,al\r
 155 \r
 156         jmp @@pcsame\r
 157 \r
 158 @@pcoff:\r
 159         in      al,pcSpeaker                            ; Turn the speaker & gate off\r
 160         and     al,0fch                                         ; ~3\r
 161         out     pcSpeaker,al\r
 162 \r
 163 @@pcsame:\r
 164         dec     [pcLengthLeft]                          ; Decrement length\r
 165         jnz     @@nopc                                          ; If not 0, we're not done with the sound\r
 166 \r
 167         mov     ax,0\r
 168         mov     [WORD PTR pcSound],ax           ; Zero the pointer\r
 169         mov     [WORD PTR pcSound + 2],ax\r
 170         mov     [SoundNumber],ax                ; Indicate no sound\r
 171         mov     [SoundPriority],ax                      ;  with no priority\r
 172 \r
 173         in      al,pcSpeaker                            ; Turn the speaker off\r
 174         and     al,0fdh                                         ; ~2\r
 175         out     pcSpeaker,al\r
 176 @@nopc:\r
 177 \r
 178         les     di,[alSound]                            ; AdLib sound effects\r
 179         mov     ax,es\r
 180         or      ax,di\r
 181         jz      @@noal                                          ; nil pointer - no AdLib effect going\r
 182 \r
 183         xor     ah,ah\r
 184         mov     al,[es:di]\r
 185         or      al,al\r
 186         jz      @@aldone\r
 187 \r
 188         CALL alOut C,alFreqL,ax\r
 189         mov     ax,[alBlock]\r
 190 \r
 191 @@aldone:\r
 192         CALL alOut C,alFreqH,ax\r
 193         inc     [WORD PTR alSound]\r
 194         dec     [alLengthLeft]\r
 195         jnz     @@noal\r
 196 \r
 197         mov     ax,0\r
 198         mov     [WORD PTR alSound],ax           ; Zero the pointer\r
 199         mov     [WORD PTR alSound + 2],ax\r
 200         mov     [SoundNumber],ax                ; Indicate no sound\r
 201         mov     [SoundPriority],ax                      ;  with no priority\r
 202         CALL alOut C,alFreqH,ax                 ; Turn off the sound\r
 203 @@noal:\r
 204 \r
 205         ENDM\r
 206 \r
 207 ;\r
 208 ;\r
 209 ;\r
 210         MACRO   TIME\r
 211         cmp     [count_time],2\r
 212         jb      @@notime\r
 213         add     [LocalTime],1\r
 214         adc     [LocalTime+2],0\r
 215         add     [TimeCount],1\r
 216         adc     [TimeCount+2],0\r
 217         mov     [count_time],0\r
 218 @@notime:\r
 219         ENDM\r
 220 \r
 221 ;\r
 222 ;       COMMONEND\r
 223 ;       Macro used for common suffix code\r
 224 ;\r
 225         MACRO   COMMONEND\r
 226 @@fullexit:\r
 227         pop     es\r
 228         ;popa\r
 229         pop di\r
 230         pop si\r
 231         pop bp\r
 232         pop [oldsp]\r
 233         pop bx\r
 234         pop dx\r
 235         pop cx\r
 236         pop ax\r
 237 \r
 238 @@nosave:\r
 239         mov     ax,[TimerDivisor]\r
 240         add     [TimerCount],ax\r
 241         jnc     @@myack\r
 242 \r
 243         pushf\r
 244         call [t0OldService]\r
 245         jmp     @@out\r
 246 \r
 247 @@myack:\r
 248         mov     al,20h\r
 249         out     20h,al\r
 250 \r
 251 @@out:\r
 252         pop     ax\r
 253         pop     ds\r
 254 \r
 255         IF DEBUG\r
 256         mov     dx,STATUS_REGISTER_1\r
 257         in      al,dx\r
 258         mov     dx,ATR_INDEX\r
 259         mov     al,ATR_OVERSCAN\r
 260         out     dx,al\r
 261         mov     al,3    ; blue\r
 262         out     dx,al\r
 263         mov     al,20h  ; normal\r
 264         out     dx,al\r
 265         pop     ax\r
 266         pop     dx\r
 267         ENDIF\r
 268 \r
 269         iret\r
 270         ENDM\r
 271 \r
 272 ;\r
 273 ;       SDL_IndicatePC\r
 274 ;\r
 275         PROC    SDL_IndicatePC on:WORD\r
 276         PUBLIC  SDL_IndicatePC\r
 277 \r
 278         mov     ax,[on]\r
 279         mov     [cs:pcindicate],ax\r
 280         ret\r
 281 \r
 282         ENDP\r
 283 \r
 284 ;\r
 285 ;       SDL_t0ExtremeAsmService\r
 286 ;       Timer 0 ISR 7000Hz interrupts\r
 287 ;\r
 288         PROC    SDL_t0ExtremeAsmService\r
 289         PUBLIC  SDL_t0ExtremeAsmService\r
 290 \r
 291         push ax\r
 292         mov     al,[BYTE PTR cs:pcindicate]\r
 293         or      al,al\r
 294         jz      @@done\r
 295 \r
 296         push ds\r
 297         push es\r
 298         ;pusha\r
 299         jmp @@skipme\r
 300         oldsp dw ?\r
 301 @@skipme:\r
 302         mov [oldsp], sp\r
 303         push ax\r
 304         push cx\r
 305         push dx\r
 306         push bx\r
 307         push [oldsp]\r
 308         push bp\r
 309         push si\r
 310         push di\r
 311 \r
 312         mov     ds,[cs:MyDS]\r
 313 \r
 314         les     di,[pcSound]\r
 315         mov     ax,es\r
 316         or      ax,di\r
 317         jz      @@donereg                                       ; nil pointer\r
 318 \r
 319         mov     bl,[es:di]                                      ; Get the byte\r
 320         inc     [WORD PTR pcSound]                      ; Increment pointer\r
 321 \r
 322         and     bl,11100000b                            ; Nuke some of the precision (DEBUG - do this in the table)\r
 323 \r
 324         xor     bh,bh\r
 325         mov     ah,[pcdtab+bx]                          ; Translate the byte\r
 326 \r
 327         in      al,pcSpeaker\r
 328         and     al,11111100b\r
 329         or      al,ah\r
 330         out     pcSpeaker,al\r
 331 \r
 332         dec     [pcLengthLeft]\r
 333         jnz     @@donereg\r
 334 \r
 335         mov     [WORD PTR pcSound],0            ; We're done with this sample\r
 336         mov     [WORD PTR pcSound+2],0\r
 337 \r
 338         in      al,pcSpeaker\r
 339         and     al,11111100b\r
 340         out     pcSpeaker,al\r
 341 \r
 342         call SDL_DigitizedDone\r
 343 \r
 344 @@donereg:\r
 345         ;popa\r
 346         pop di\r
 347         pop si\r
 348         pop bp\r
 349         pop [oldsp]\r
 350         pop bx\r
 351         pop dx\r
 352         pop cx\r
 353         pop ax\r
 354         pop     es\r
 355         pop     ds\r
 356 \r
 357 @@done:\r
 358         inc     [cs:extreme]\r
 359         cmp     [cs:extreme],10\r
 360         jae     @@tofast\r
 361 \r
 362         mov     al,20h\r
 363         out     20h,al\r
 364         pop     ax\r
 365         iret\r
 366 \r
 367 @@tofast:\r
 368         mov     [cs:extreme],0\r
 369         pop     ax\r
 370 \r
 371 ;       jmp     SDL_t0FastAsmService                    ; Drops through to SDL_t0FastAsmService\r
 372 \r
 373         ENDP\r
 374 \r
 375 ;\r
 376 ;       SDL_t0FastAsmService\r
 377 ;       Timer 0 ISR for 700Hz interrupts\r
 378 ;\r
 379         PROC    SDL_t0FastAsmService\r
 380         PUBLIC  SDL_t0FastAsmService\r
 381 \r
 382         COMMONSTART\r
 383 \r
 384         inc     [count_fx]                                              ; Time to do PC/AdLib effects & time?\r
 385         cmp     [count_fx],5\r
 386         jae     @@dofull\r
 387 \r
 388         mov     ax,[sqActive]                                   ; Is the sequencer active?\r
 389         or      ax,ax\r
 390         jnz     @@dofull\r
 391 \r
 392         mov     ax,[WORD PTR ssSample]                  ; Is there a sample for the Sound Src?\r
 393         or      ax,[WORD PTR ssSample+2]\r
 394         jz      @@nosave\r
 395 \r
 396 @@dofull:\r
 397         ;pusha\r
 398         mov [oldsp], sp\r
 399         push ax\r
 400         push cx\r
 401         push dx\r
 402         push bx\r
 403         push [oldsp]\r
 404         push bp\r
 405         push si\r
 406         push di\r
 407         push es\r
 408 \r
 409         cmp     [count_fx],5\r
 410         jb      @@nofx\r
 411         mov     [count_fx],0\r
 412         DOFX\r
 413 \r
 414         inc     [count_time]\r
 415         TIME\r
 416 @@nofx:\r
 417 \r
 418         mov     ax,[sqActive]\r
 419         or      ax,ax\r
 420         jz      @@nosq\r
 421 \r
 422         mov     ax,[sqHackLen]\r
 423         or      ax,ax\r
 424         jz      @@sqdone\r
 425 \r
 426         les     di,[sqHackPtr]\r
 427 @@sqloop:\r
 428         mov     ax,[WORD PTR sqHackTime+2]\r
 429         cmp     ax,[WORD PTR alTimeCount+2]\r
 430         ja      @@sqdone\r
 431         mov     ax,[WORD PTR sqHackTime]\r
 432         cmp     ax,[WORD PTR alTimeCount]\r
 433         ja      @@sqdone\r
 434 \r
 435         mov     ax,[es:di+2]                                    ; Get time to next event\r
 436         add     ax,[WORD PTR alTimeCount]\r
 437         mov     [WORD PTR sqHackTime],ax\r
 438         mov     ax,[WORD PTR alTimeCount+2]\r
 439         adc     ax,0\r
 440         mov     [WORD PTR sqHackTime+2],ax\r
 441 \r
 442         mov     ax,[es:di]                                              ; Get register/value pair\r
 443         xor     bh,bh\r
 444         mov     bl,ah\r
 445         xor     ah,ah\r
 446         CALL alOut C,ax,bx\r
 447 \r
 448         add     di,4\r
 449         mov     [WORD PTR sqHackPtr],di\r
 450 \r
 451         sub     [sqHackLen],4\r
 452         jnz     @@sqloop\r
 453 \r
 454 @@sqdone:\r
 455         add     [WORD PTR alTimeCount],1\r
 456         adc     [WORD PTR alTimeCount+2],0\r
 457         mov     ax,[sqHackLen]\r
 458         or      ax,ax\r
 459         jnz     @@nosq\r
 460 \r
 461         mov     ax,[WORD PTR sqHack]            ; Copy pointer\r
 462         mov     [WORD PTR sqHackPtr],ax\r
 463         mov     ax,[WORD PTR sqHack+2]\r
 464         mov     [WORD PTR sqHackPtr+2],ax\r
 465 \r
 466         mov     ax,[sqHackSeqLen]                       ; Copy length\r
 467         mov     [sqHackLen],ax\r
 468 \r
 469         mov     ax,0\r
 470         mov     [WORD PTR alTimeCount],ax       ; Reset time counts\r
 471         mov     [WORD PTR alTimeCount+2],ax\r
 472         mov     [WORD PTR sqHackTime],ax\r
 473         mov     [WORD PTR sqHackTime+2],ax\r
 474 @@nosq:\r
 475 \r
 476         les     di,[ssSample]                   ; Get pointer to Sound Source sample\r
 477         mov     ax,es\r
 478         or      ax,di\r
 479         jz      @@ssdone                                ; If nil, skip this\r
 480 \r
 481 @@ssloop:\r
 482         mov     dx,[ssStatus]                   ; Check to see if FIFO has any empty slots\r
 483         in      al,dx\r
 484         test al,40h\r
 485         jnz     @@ssdone                                ; Nope - don't push any more data out\r
 486 \r
 487         mov     dx,[ssData]\r
 488         mov     al,[es:di]                              ; al = *ssSample\r
 489         out     dx,al                                   ; Pump the value out\r
 490 \r
 491         mov     dx,[ssControl]                  ; Pulse printer select\r
 492         mov     al,[ssOff]\r
 493         out     dx,al\r
 494         push ax\r
 495         pop     ax\r
 496         mov     al,[ssOn]\r
 497         out     dx,al\r
 498 \r
 499         push ax                                         ; Delay a short while\r
 500         pop     ax\r
 501 \r
 502         inc     di\r
 503         mov     [WORD PTR ssSample],di  ; ssSample++\r
 504 \r
 505         dec     [ssLengthLeft]\r
 506         jnz @@ssloop\r
 507 \r
 508         mov     [WORD PTR ssSample],0   ; We're done with this sample\r
 509         mov     [WORD PTR ssSample+2],0\r
 510 \r
 511         call SDL_DigitizedDone\r
 512 @@ssdone:\r
 513 \r
 514         COMMONEND\r
 515 \r
 516         ENDP\r
 517 \r
 518 ;\r
 519 ;       SDL_t0SlowAsmService\r
 520 ;       Timer 0 ISR for 140Hz interrupts\r
 521 ;\r
 522         PROC    SDL_t0SlowAsmService\r
 523         PUBLIC  SDL_t0SlowAsmService\r
 524 \r
 525         IF DEBUG\r
 526         push dx\r
 527         push ax\r
 528         mov     dx,STATUS_REGISTER_1\r
 529         in      al,dx\r
 530         mov     dx,ATR_INDEX\r
 531         mov     al,ATR_OVERSCAN\r
 532         out     dx,al\r
 533         mov     al,4    ; red\r
 534         out     dx,al\r
 535         ENDIF\r
 536 \r
 537         push ds\r
 538         push ax\r
 539 \r
 540         mov     ds,[cs:MyDS]\r
 541 \r
 542         inc     [count_time]\r
 543         TIME\r
 544 \r
 545         mov     ax,[WORD PTR pcSound]           ; Is there a PC sound effect going?\r
 546         or      ax,[WORD PTR pcSound+2]\r
 547         jnz     @@dofull\r
 548 \r
 549         mov     ax,[WORD PTR alSound]           ; Is there an AdLib sound effect going?\r
 550         or      ax,[WORD PTR alSound+2]\r
 551         jz      @@nosave\r
 552 \r
 553 @@dofull:\r
 554         ;pusha\r
 555         mov [oldsp], sp\r
 556         push ax\r
 557         push cx\r
 558         push dx\r
 559         push bx\r
 560         push [oldsp]\r
 561         push bp\r
 562         push si\r
 563         push di\r
 564         push es\r
 565 \r
 566         DOFX\r
 567 \r
 568         COMMONEND\r
 569 \r
 570         ENDP\r
 571 \r
 572         END\r