Software Vault: The Games Collection 1

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Assembly Source File | 1993-08-20 | 31KB | 1,582 lines

; 320x240x256 (requires register-compatible VGA+) ; Loadable driver for The Graphics Engine ; Copyright (c) 1993 by Matthew Hildebrand ; Turbo Assembler syntax IDEAL P486N ; 386 code, but we want 486 alignment MODEL LARGE SCREEN_WIDE = 320 SCREEN_DEEP = 240 NUM_COLOURS = 256 CODESEG ORG 0 ;*** Signature db 'TGE3' ;*** Non-I/O functions _initGraphics dw initGraphics ; initGraphics dw ? _deInitGraphics dw 0 ; deInitGraphics dw ? _setPaletteReg dw setPaletteReg ; setPaletteReg dw ? _getPaletteReg dw getPaletteReg ; getPaletteReg dw ? _setBlockPalette dw setBlockPalette ; setBlockPalette dw ? _getBlockPalette dw getBlockPalette ; getBlockPalette dw ? _colourCloseTo dw 0 ; colourCloseTo dw ? _colourCloseToX dw 0 ; colourCloseToX dw ? _imageSize dw 0 ; imageSize dw ? _imageSizeDim dw 0 ; imageSizeDim dw ? _setPage dw 0 ; setPage (not implemented yet) dw ? ;*** Currently active I/O functions (filled in by loadGraphDriver()) dd 20 DUP(?) ;*** Input functions _getImage_scr dw 0 ; getImage dw ? _getImage_mem dw 0 dw ? _getLine_scr dw getLine_scr ; getLine dw ? _getLine_mem dw getLine_mem dw ? _getPixel_scr dw getPixel_scr ; getPixel dw ? _getPixel_mem dw getPixel_mem dw ? ;*** Output functions _putImage_scr_copy dw 0 ; putImage dw ? _putImage_scr_and dw 0 dw ? _putImage_scr_not dw 0 dw ? _putImage_scr_or dw 0 dw ? _putImage_scr_xor dw 0 dw ? _putImage_mem_copy dw 0 dw ? _putImage_mem_and dw 0 dw ? _putImage_mem_not dw 0 dw ? _putImage_mem_or dw 0 dw ? _putImage_mem_xor dw 0 dw ? _putImageInv_scr_copy dw 0 ; putImageInv dw ? _putImageInv_scr_and dw 0 dw ? _putImageInv_scr_not dw 0 dw ? _putImageInv_scr_or dw 0 dw ? _putImageInv_scr_xor dw 0 dw ? _putImageInv_mem_copy dw 0 dw ? _putImageInv_mem_and dw 0 dw ? _putImageInv_mem_not dw 0 dw ? _putImageInv_mem_or dw 0 dw ? _putImageInv_mem_xor dw 0 dw ? _putLine_scr_copy dw putLine_scr_copy ; putLine dw ? _putLine_scr_and dw 0 dw ? _putLine_scr_not dw 0 dw ? _putLine_scr_or dw 0 dw ? _putLine_scr_xor dw 0 dw ? _putLine_mem_copy dw putLine_mem_copy dw ? _putLine_mem_and dw 0 dw ? _putLine_mem_not dw 0 dw ? _putLine_mem_or dw 0 dw ? _putLine_mem_xor dw 0 dw ? _putLineInv_scr_copy dw 0 ; putLineInv dw ? _putLineInv_scr_and dw 0 dw ? _putLineInv_scr_not dw 0 dw ? _putLineInv_scr_or dw 0 dw ? _putLineInv_scr_xor dw 0 dw ? _putLineInv_mem_copy dw 0 dw ? _putLineInv_mem_and dw 0 dw ? _putLineInv_mem_not dw 0 dw ? _putLineInv_mem_or dw 0 dw ? _putLineInv_mem_xor dw 0 dw ? _putPixel_scr_copy dw putPixel_scr_copy ; putPixel dw ? _putPixel_scr_and dw 0 dw ? _putPixel_scr_not dw 0 dw ? _putPixel_scr_or dw 0 dw ? _putPixel_scr_xor dw 0 dw ? _putPixel_mem_copy dw putPixel_mem_copy dw ? _putPixel_mem_and dw putPixel_mem_and dw ? _putPixel_mem_not dw putPixel_mem_not dw ? _putPixel_mem_or dw putPixel_mem_or dw ? _putPixel_mem_xor dw putPixel_mem_xor dw ? _line_scr_copy dw 0 ; line dw ? _line_scr_and dw 0 dw ? _line_scr_not dw 0 dw ? _line_scr_or dw 0 dw ? _line_scr_xor dw 0 dw ? _line_mem_copy dw 0 dw ? _line_mem_and dw 0 dw ? _line_mem_not dw 0 dw ? _line_mem_or dw 0 dw ? _line_mem_xor dw 0 dw ? _horizLine_scr_copy dw horizLine_scr_copy ; horizLine dw ? _horizLine_scr_and dw 0 dw ? _horizLine_scr_not dw 0 dw ? _horizLine_scr_or dw 0 dw ? _horizLine_scr_xor dw 0 dw ? _horizLine_mem_copy dw horizLine_mem_copy dw ? _horizLine_mem_and dw 0 dw ? _horizLine_mem_not dw 0 dw ? _horizLine_mem_or dw 0 dw ? _horizLine_mem_xor dw 0 dw ? _vertLine_scr_copy dw 0 ; vertLine dw ? _vertLine_scr_and dw 0 dw ? _vertLine_scr_not dw 0 dw ? _vertLine_scr_or dw 0 dw ? _vertLine_scr_xor dw 0 dw ? _vertLine_mem_copy dw 0 dw ? _vertLine_mem_and dw 0 dw ? _vertLine_mem_not dw 0 dw ? _vertLine_mem_or dw 0 dw ? _vertLine_mem_xor dw 0 dw ? _drawRect_scr_copy dw 0 ; drawRect dw ? _drawRect_scr_and dw 0 dw ? _drawRect_scr_not dw 0 dw ? _drawRect_scr_or dw 0 dw ? _drawRect_scr_xor dw 0 dw ? _drawRect_mem_copy dw 0 dw ? _drawRect_mem_and dw 0 dw ? _drawRect_mem_not dw 0 dw ? _drawRect_mem_or dw 0 dw ? _drawRect_mem_xor dw 0 dw ? _filledRect_scr_copy dw 0 ; filledRect dw ? _filledRect_scr_and dw 0 dw ? _filledRect_scr_not dw 0 dw ? _filledRect_scr_or dw 0 dw ? _filledRect_scr_xor dw 0 dw ? _filledRect_mem_copy dw 0 dw ? _filledRect_mem_and dw 0 dw ? _filledRect_mem_not dw 0 dw ? _filledRect_mem_or dw 0 dw ? _filledRect_mem_xor dw 0 dw ? _clearGraphics_scr_copy dw clearGraphics_scr_copy ; clearGraphics dw ? _clearGraphics_scr_and dw 0 dw ? _clearGraphics_scr_not dw 0 dw ? _clearGraphics_scr_or dw 0 dw ? _clearGraphics_scr_xor dw 0 dw ? _clearGraphics_mem_copy dw 0 dw ? _clearGraphics_mem_and dw 0 dw ? _clearGraphics_mem_not dw 0 dw ? _clearGraphics_mem_or dw 0 dw ? _clearGraphics_mem_xor dw 0 dw ? _ellipse_scr_copy dw 0 ; ellipse dw ? _ellipse_scr_and dw 0 dw ? _ellipse_scr_not dw 0 dw ? _ellipse_scr_or dw 0 dw ? _ellipse_scr_xor dw 0 dw ? _ellipse_mem_copy dw 0 dw ? _ellipse_mem_and dw 0 dw ? _ellipse_mem_not dw 0 dw ? _ellipse_mem_or dw 0 dw ? _ellipse_mem_xor dw 0 dw ? _filledEllipse_scr_copy dw 0 ; filledEllipse dw ? _filledEllipse_scr_and dw 0 dw ? _filledEllipse_scr_not dw 0 dw ? _filledEllipse_scr_or dw 0 dw ? _filledEllipse_scr_xor dw 0 dw ? _filledEllipse_mem_copy dw 0 dw ? _filledEllipse_mem_and dw 0 dw ? _filledEllipse_mem_not dw 0 dw ? _filledEllipse_mem_or dw 0 dw ? _filledEllipse_mem_xor dw 0 dw ? _circle_scr_copy dw 0 ; circle dw ? _circle_scr_and dw 0 dw ? _circle_scr_not dw 0 dw ? _circle_scr_or dw 0 dw ? _circle_scr_xor dw 0 dw ? _circle_mem_copy dw 0 dw ? _circle_mem_and dw 0 dw ? _circle_mem_not dw 0 dw ? _circle_mem_or dw 0 dw ? _circle_mem_xor dw 0 dw ? _filledCircle_scr_copy dw 0 ; filledCircle dw ? _filledCircle_scr_and dw 0 dw ? _filledCircle_scr_not dw 0 dw ? _filledCircle_scr_or dw 0 dw ? _filledCircle_scr_xor dw 0 dw ? _filledCircle_mem_copy dw 0 dw ? _filledCircle_mem_and dw 0 dw ? _filledCircle_mem_not dw 0 dw ? _filledCircle_mem_or dw 0 dw ? _filledCircle_mem_xor dw 0 dw ? _fillRegion_scr_copy dw 0 ; fillRegion dw ? _fillRegion_scr_and dw 0 dw ? _fillRegion_scr_not dw 0 dw ? _fillRegion_scr_or dw 0 dw ? _fillRegion_scr_xor dw 0 dw ? _fillRegion_mem_copy dw 0 dw ? _fillRegion_mem_and dw 0 dw ? _fillRegion_mem_not dw 0 dw ? _fillRegion_mem_or dw 0 dw ? _fillRegion_mem_xor dw 0 dw ? _fillLine_scr_copy dw horizLine_scr_copy ; fillLine dw ? _fillLine_scr_and dw 0 dw ? _fillLine_scr_not dw 0 dw ? _fillLine_scr_or dw 0 dw ? _fillLine_scr_xor dw 0 dw ? _fillLine_mem_copy dw horizLine_mem_copy dw ? _fillLine_mem_and dw 0 dw ? _fillLine_mem_not dw 0 dw ? _fillLine_mem_or dw 0 dw ? _fillLine_mem_xor dw 0 dw ? ;*** Mode information scrnMaxX dw 319 ; physical dimensions scrnMaxY dw 239 maxColour dw 255 ; maximum colour number xRatio dw 4 ; aspect ratio 4:3 (320:240 in yRatio dw 3 ; lowest terms) bitsPerPixel dw 8 ; 8 bits per pixel inMaxX dw 319 ; current input screen dimensions inMaxY dw 239 outMaxX dw 319 ; current output screen dimensions outMaxY dw 239 inScreenWide dw ? ; needed only for virtual screens outScreenWide dw ? ;*** Viewport information inViewportULX dw 0 inViewportULY dw 0 inViewportLRX dw 319 inViewportLRY dw 239 outViewportULX dw 0 outViewportULY dw 0 outViewportLRX dw 319 outViewportLRY dw 239 ;*** Paging information pagingSupported dw ? ; not implemented yet curPage dw ? ; not implemented yet maxPage dw ? ; not implemented yet ;*** Force (image width MOD imageWideAdjust) = 0. imageWideAdjust dw ? ; not implemented yet ;*** Current and screen addresses LABEL inAddr DWORD ; current input address inOff dw 0 inSeg dw 0A000h LABEL outAddr DWORD ; current output address outOff dw 0 outSeg dw 0A000h LABEL scrAddr DWORD ; screen address scrOff dw 0 scrSeg dw 0A000h ;*** Copyright string db 'The Graphics Engine -- Copyright (c) 1993 by Matthew Hildebrand' inited db 0 colourPalette db 768 DUP(?) lineOffs dw 240 DUP(?) ; Plane masks for horizLine leftEdgeMask db 1111b, 1110b, 1100b, 1000b rightEdgeMask db 0001b, 0011b, 0111b, 1111b SC_INDEX EQU 3C4h ; Sequence Controller Index GC_INDEX EQU 3CEh ; Graphics Controller Index register CRTC_INDEX EQU 3D4h ; CRT Controller Index MISC_OUTPUT EQU 3C2h ; Miscellaneous Output register MAP_MASK EQU 02h ; index in SC of Map Mask register READ_MAP EQU 4 ; Read Map register index in GC MEMORY_MODE EQU 4 ; Memory mode register in SC GRAPHICS_MODE EQU 5 ; Graphics Mode register index in GC MISCELLANEOUS EQU 6 ; Miscellaneous register index in GC MAX_SCAN_LINE EQU 9 ; Maximum Scan Line reg index in CRTC START_ADDR_HIGH EQU 0Ch ; Start Address High reg index in CRTC UNDERLINE EQU 14h ; Underline Location reg index in CRTC MODE_CONTROL EQU 17h ; Mode Control register index in CRTC INPUT_STATUS_1 EQU 03DAh ; Input Status 1 register START_ADDR_HIGH EQU 0Ch ; start address high byte START_ADDR_LOW EQU 0Dh ; start address low byte WORD_OUTS_OK EQU 1 ; Set to 0 for VGAs that can't handle ; word OUTs to indexed VGA registers MACRO OUT_WORD if WORD_OUTS_OK out dx,ax else out dx,al inc dx xchg ah,al out dx,al dec dx xchg ah,al endif ENDM ;***** ;***** initGraphics ;***** PROC C initGraphics push si di mov ax,0013h ; set mode 13h int 10h mov dx,SC_INDEX mov ax,0604h out dx,ax ; disable chain4 mode mov ax,0100h out dx,ax ; synchronous reset while setting ; Misc Output for safety, even ; though clock unchanged mov dx,MISC_OUTPUT mov al,0E3h out dx,al ; select 25 MHz dot clock & 60 Hz ; scanning rate mov dx,SC_INDEX mov ax,0300h out dx,ax ; undo reset (restart sequencer) mov dx,CRTC_INDEX ; reprogram the CRT Controller mov al,11h ; VSync End reg contains register out dx,al ; write protect bit inc dx ; CRT Controller Data register in al,dx ; get current VSync End register setting and al,7Fh ; remove write protect on various out dx,al ; CRTC registers dec dx ; CRT Controller Index mov ax,00D06h ; set CRT parameters out dx,ax mov ax,03E07h out dx,ax mov ax,04109h out dx,ax mov ax,0EA10h out dx,ax mov ax,0AC11h out dx,ax mov ax,0DF12h out dx,ax mov ax,00014h out dx,ax mov ax,0E715h out dx,ax mov ax,00616h out dx,ax mov ax,0E317h out dx,ax mov dx,SC_INDEX mov ax,0F02h out dx,ax ; enable writes to all four planes mov ax,0A000h ; now clear all display memory, 8 mov es,ax ; pixels at a time xor di,di ; point ES:DI to display memory xor ax,ax ; clear to zero-value pixels mov cx,8000h ; # of words in display memory rep stosw ; clear all of display memory cmp [inited],0 ; restore palette if necessary je @@notInited pop di si mov ax,1 retf @@notInited: mov [inited],1 mov si,OFFSET lineOffs mov cx,SCREEN_DEEP xor bx,bx @@LLoop: mov ax,SCREEN_WIDE/4 mul bx mov [cs:si],ax add si,2 inc bx loop @@LLoop pop di si mov ax,1 retf ENDP ;***** ;***** putLine ;***** PROC C putLine_scr_copy ARG lineNum:WORD, xOff:WORD, lineLen:WORD, buf:DATAPTR LOCAL x2:WORD push ds si di mov bx,[lineNum] ; start address in ES:DI shl bx,1 mov di,[lineOffs+bx] mov dx,[xOff] shr dx,2 add di,dx mov ax,0A000h mov es,ax lds si,[buf] ; source in DS:SI cld mov bx,[xOff] add bx,[lineLen] ; calculate x2 dec bx mov [x2],bx mov cx,[lineLen] ; line is short cmp cx,4 JUMPS jle @@ShortLine NOJUMPS mov cx,[xOff] ; calculate starting plane mov bx,cx mov ax,0102h and cl,3 shl ah,cl mov dx,SC_INDEX OUT_WORD push si mov bx,[x2] mov cx,[xOff] @@Loop1: cmp cx,bx jg @@Loop1Done lodsb stosb add cx,4 add si,3 jmp short @@Loop1 @@Loop1Done: pop si inc si push si mov bx,[xOff] inc bx mov cx,bx mov ax,0102h and cl,3 shl ah,cl mov dx,SC_INDEX OUT_WORD mov cx,bx mov bx,[lineNum] ; start address in ES:DI shl bx,1 mov di,[lineOffs+bx] shr cx,2 add di,cx mov bx,[x2] mov cx,[xOff] inc cx @@Loop2: cmp cx,bx jg @@Loop2Done lodsb stosb add cx,4 add si,3 jmp short @@Loop2 @@Loop2Done: pop si inc si push si mov bx,[xOff] add bx,2 mov cx,bx mov ax,0102h and cl,3 shl ah,cl mov dx,SC_INDEX OUT_WORD mov cx,bx mov bx,[lineNum] shl bx,1 mov di,[lineOffs+bx] shr cx,2 add di,cx mov bx,[x2] mov cx,[xOff] add cx,2 @@Loop3: cmp cx,bx jg @@Loop3Done lodsb stosb add cx,4 add si,3 jmp short @@Loop3 @@Loop3Done: pop si inc si mov bx,[xOff] add bx,3 mov cx,bx mov ax,0102h and cl,3 shl ah,cl mov dx,SC_INDEX OUT_WORD mov cx,bx mov bx,[lineNum] shl bx,1 mov di,[lineOffs+bx] shr cx,2 add di,cx mov bx,[x2] mov cx,[xOff] add cx,3 @@Loop4: cmp cx,bx jg @@Exit lodsb stosb add cx,4 add si,3 jmp short @@Loop4 @@ShortLine: mov cx,[xOff] mov bx,cx and cl,3 mov ax,0102h shl ah,cl mov dx,SC_INDEX OUT_WORD mov cx,bx shr bx,2 mov di,bx mov bx,[lineNum] shl bx,1 add di,[lineOffs+bx] movsb cmp cx,[x2] jge @@Exit inc [xOff] jmp short @@ShortLine @@Exit: pop di si ds leave retf ENDP PROC C putLine_mem_copy ARG y:WORD, xOff:WORD, lineLen:WORD, buf:DATAPTR push ds si di ; save these registers xor eax,eax ; clear EAX xor edx,edx ; clear EDX xor edi,edi ; clear EDI les di,[outAddr] ; load output address mov ax,[y] mov dx,[outScreenWide] mul edx ; EDX:EAX = offset - EDI - x add edi,eax ; EDI = offset - x mov dx,[xOff] add edi,edx ; EDI = offset mov edx,edi ; EDX = offset shr edx,4 ; EDX = # of paragraphs (segments) add dx,[outSeg] ; DX = new segment mov es,dx ; ES = new segment and di,0000000000001111b ; DI = offset within new segment lds si,[buf] ; load input address mov dx,si ; DX = offset shr dx,4 ; DX = # of paragraphs (segments) mov ax,ds ; AX = DS add ax,dx ; AX = new DS mov ds,ax ; DS = new DS and si,0000000000001111b ; SI = offset within new segment cld mov cx,[lineLen] ; CX = line length mov dx,cx ; DX = line length shr cx,2 ; CX = line length in dwords rep movsd ; move the dwords if necessary mov cx,dx ; CX = line length in bytes and cx,0000000000000011b ; CX = any residual bytes rep movsb ; move the bytes if necessary pop di si ds ; restore registers leave ; clean up retf ; return ENDP ;***** ;***** getLine ;***** PROC C getLine_scr ARG lineNum:WORD, xOff:WORD, lineLen:WORD, buf:DATAPTR LOCAL x2:WORD push ds si di mov bx,[lineNum] ; start address in ES:DI shl bx,1 mov si,[lineOffs+bx] mov dx,[xOff] shr dx,2 add si,dx mov ax,0A000h mov ds,ax les di,[buf] ; buffer addr in DS:SI cld mov bx,[xOff] add bx,[lineLen] ; calculate x2 dec bx mov [x2],bx mov cx,[lineLen] ; line is short cmp cx,4 JUMPS jle @@ShortLine NOJUMPS mov ax,[xOff] ; calculate starting plane mov bx,ax and al,3 mov ah,al mov al,READ_MAP mov dx,GC_INDEX OUT_WORD push di mov bx,[x2] mov cx,[xOff] @@Loop1: cmp cx,bx jg @@Loop1Done lodsb stosb add cx,4 add di,3 jmp short @@Loop1 @@Loop1Done: pop di inc di push di mov bx,[xOff] inc bx mov ax,bx and al,3 mov ah,al mov al,READ_MAP mov dx,GC_INDEX OUT_WORD mov cx,bx mov bx,[lineNum] ; start address in ES:DI shl bx,1 mov si,[lineOffs+bx] shr cx,2 add si,cx mov bx,[x2] mov cx,[xOff] inc cx @@Loop2: cmp cx,bx jg @@Loop2Done lodsb stosb add cx,4 add di,3 jmp short @@Loop2 @@Loop2Done: pop di inc di push di mov bx,[xOff] add bx,2 mov ax,bx and al,3 mov ah,al mov al,READ_MAP mov dx,GC_INDEX OUT_WORD mov cx,bx mov bx,[lineNum] shl bx,1 mov si,[lineOffs+bx] shr cx,2 add si,cx mov bx,[x2] mov cx,[xOff] add cx,2 @@Loop3: cmp cx,bx jg @@Loop3Done lodsb stosb add cx,4 add di,3 jmp short @@Loop3 @@Loop3Done: pop di inc di mov bx,[xOff] add bx,3 mov ax,bx and al,3 mov ah,al mov al,READ_MAP mov dx,GC_INDEX OUT_WORD mov cx,bx mov bx,[lineNum] shl bx,1 mov si,[lineOffs+bx] shr cx,2 add si,cx mov bx,[x2] mov cx,[xOff] add cx,3 @@Loop4: cmp cx,bx jg @@Exit lodsb stosb add cx,4 add di,3 jmp short @@Loop4 @@ShortLine: mov ax,[xOff] mov bx,ax and al,3 mov ah,al mov al,READ_MAP mov dx,GC_INDEX OUT_WORD mov cx,bx shr bx,2 mov si,bx mov bx,[lineNum] shl bx,1 add si,[lineOffs+bx] movsb cmp cx,[x2] jge @@Exit inc [xOff] jmp short @@ShortLine @@Exit: pop di si ds leave retf ENDP PROC C getLine_mem ARG y:WORD, xOff:WORD, lineLen:WORD, buf:DATAPTR push ds si di ; save these registers xor eax,eax ; clear EAX xor edx,edx ; clear EDX xor esi,esi ; clear ESI les si,[inAddr] ; load input address mov ax,[y] mov dx,[inScreenWide] mul edx ; EDX:EAX = offset - ESI - x add esi,eax ; ESI = offset - x mov dx,[xOff] add esi,edx ; ESI = offset mov edx,esi ; EDX = offset shr edx,4 ; EDX = # of paragraphs (segments) add dx,[inSeg] ; DX = new segment mov ds,dx ; ES = new segment and si,0000000000001111b ; SI = offset within new segment les di,[buf] ; load output address mov dx,di ; DX = offset shr dx,4 ; DX = # of paragraphs (segments) mov ax,es ; AX = ES add ax,dx ; AX = new ES mov es,ax ; ES = new ES and di,0000000000001111b ; DI = offset within new segment cld mov cx,[lineLen] ; CX = line length mov dx,cx ; DX = line length shr cx,2 ; CX = line length in dwords rep movsd ; move the dwords if necessary mov cx,dx ; CX = line length in bytes and cx,0000000000000011b ; CX = any residual bytes rep movsb ; move the bytes if necessary pop di si ds ; restore registers leave ; clean up retf ; return ENDP ;***** ;***** putPixel ;***** ; Copy a pixel to the screen PROC C putPixel_scr_copy ARG x:WORD, y:WORD, colour:BYTE push di mov ax,0A000h mov es,ax mov bx,[y] ; point to start of desired row shl bx,1 mov bx,[lineOffs+bx] mov dx,[x] mov cx,dx ; store x coord shr dx,2 add bx,dx mov di,bx ; ES:DI points to pixel and cl,3 ; get the plane # of the pixel mov ax,102h shl ah,cl ; set the bit corresponding to plane mov dx,SC_INDEX OUT_WORD mov bl,[colour] mov [es:di],bl pop di leave retf ENDP ; Copy a pixel to memory PROC C putPixel_mem_copy ARG x:WORD,y:WORD,colour:BYTE xor eax,eax ; clear EAX xor ebx,ebx ; clear EBX xor edx,edx ; clear EDX les bx,[outAddr] ; load output address mov ax,[y] mov dx,[outScreenWide] mul edx ; EDX:EAX = offset - EBX - x add ebx,eax ; EBX = offset - x mov dx,[x] add ebx,edx ; EBX = offset mov edx,ebx ; EDX = offset shr edx,4 ; EDX = # of paragraphs (segments) add dx,[outSeg] ; DX = new segment mov es,dx ; ES = new segment and bx,0000000000001111b ; BX = offset within new segment mov al,[colour] ; colour in AL mov [es:bx],al ; store pixel leave ; clean up retf ; return ENDP ; AND a pixel to memory PROC C putPixel_mem_and ARG x:WORD,y:WORD,colour:BYTE xor eax,eax ; clear EAX xor ebx,ebx ; clear EBX xor edx,edx ; clear EDX les bx,[outAddr] ; load output address mov ax,[y] mov dx,[outScreenWide] mul edx ; EDX:EAX = offset - EBX - x add ebx,eax ; EBX = offset - x mov dx,[x] add ebx,edx ; EBX = offset mov edx,ebx ; EDX = offset shr edx,4 ; EDX = # of paragraphs (segments) add dx,[outSeg] ; DX = new segment mov es,dx ; ES = new segment and bx,0000000000001111b ; BX = offset within new segment mov al,[colour] ; colour in AL and [es:bx],al ; AND pixel leave ; clean up retf ; return ENDP ; NOT a pixel to memory PROC C putPixel_mem_not ARG x:WORD,y:WORD,colour:BYTE xor eax,eax ; clear EAX xor ebx,ebx ; clear EBX xor edx,edx ; clear EDX les bx,[outAddr] ; load output address mov ax,[y] mov dx,[outScreenWide] mul edx ; EDX:EAX = offset - EBX - x add ebx,eax ; EBX = offset - x mov dx,[x] add ebx,edx ; EBX = offset mov edx,ebx ; EDX = offset shr edx,4 ; EDX = # of paragraphs (segments) add dx,[outSeg] ; DX = new segment mov es,dx ; ES = new segment and bx,0000000000001111b ; BX = offset within new segment mov al,[colour] ; colour in AL not al ; NOT it mov [es:bx],al ; store NOTed pixel leave ; clean up retf ; return ENDP ; OR a pixel to memory PROC C putPixel_mem_or ARG x:WORD,y:WORD,colour:BYTE xor eax,eax ; clear EAX xor ebx,ebx ; clear EBX xor edx,edx ; clear EDX les bx,[outAddr] ; load output address mov ax,[y] mov dx,[outScreenWide] mul edx ; EDX:EAX = offset - EBX - x add ebx,eax ; EBX = offset - x mov dx,[x] add ebx,edx ; EBX = offset mov edx,ebx ; EDX = offset shr edx,4 ; EDX = # of paragraphs (segments) add dx,[outSeg] ; DX = new segment mov es,dx ; ES = new segment and bx,0000000000001111b ; BX = offset within new segment mov al,[colour] ; colour in AL or [es:bx],al ; OR pixel leave ; clean up retf ; return ENDP ; XOR a pixel to memory PROC C putPixel_mem_xor ARG x:WORD,y:WORD,colour:BYTE xor eax,eax ; clear EAX xor ebx,ebx ; clear EBX xor edx,edx ; clear EDX les bx,[outAddr] ; load output address mov ax,[y] mov dx,[outScreenWide] mul edx ; EDX:EAX = offset - EBX - x add ebx,eax ; EBX = offset - x mov dx,[x] add ebx,edx ; EBX = offset mov edx,ebx ; EDX = offset shr edx,4 ; EDX = # of paragraphs (segments) add dx,[outSeg] ; DX = new segment mov es,dx ; ES = new segment and bx,0000000000001111b ; BX = offset within new segment mov al,[colour] ; colour in AL xor [es:bx],al ; XOR pixel leave ; clean up retf ; return ENDP ;***** ;***** getPixel ;***** ; Get a pixel from the screen PROC C getPixel_scr ARG x:WORD, y:WORD push di mov ax,0A000h mov es,ax mov bx,[y] ; point to start of desired row shl bx,1 mov bx,[lineOffs+bx] mov dx,[x] mov cx,dx ; store x coord shr dx,2 add bx,dx mov di,bx ; ES:DI points to pixel and cl,3 ; get the plane # of the pixel mov al,READ_MAP mov ah,cl mov dx,GC_INDEX ; set the bit corresponding to plane OUT_WORD xor ax,ax mov al,[es:di] pop di leave retf ENDP ; Get a pixel from memory PROC C getPixel_mem ARG x:WORD,y:WORD xor eax,eax ; clear EAX xor ebx,ebx ; clear EBX xor edx,edx ; clear EDX les bx,[inAddr] ; load input address mov ax,[y] mov dx,[inScreenWide] mul edx ; EDX:EAX = offset - EBX - x add ebx,eax ; EBX = offset - x mov dx,[x] add ebx,edx ; EBX = offset mov edx,ebx ; EDX = offset shr edx,4 ; EDX = # of paragraphs (segments) add dx,[inSeg] ; DX = new segment mov es,dx ; ES = new segment and bx,0000000000001111b ; BX = offset within new segment xor ax,ax ; clear AX mov al,[es:bx] ; store pixel in AX for return leave ; clean up retf ; return ENDP ;***** ;***** horizLine ;***** PROC C horizLine_scr_copy ARG y:WORD, x1:WORD, x2:WORD, colour:BYTE LOCAL adj1:WORD, adj2:WORD push si di cld mov ax,[x1] ; set up adj1 and ax,3 jz @@adj1A mov bx,4 sub bx,ax mov ax,[x1] add ax,bx mov [adj1],ax jmp short @@adj1B @@adj1A: mov ax,[x1] mov [adj1],ax @@adj1B: mov ax,[x2] ; set up adj2 mov [adj2],ax and ax,3 sub [adj2],ax mov ax,[x1] ; ensure x1 <= x2 cmp ax,[x2] jbe @@setup mov bx,[x2] mov [x1],bx mov [x2],ax @@setup: mov ax,0A000h ; set ES:DI to line start address mov es,ax mov bx,[y] shl bx,1 mov di,[lineOffs+bx] mov bx,[x1] ; current x counter shr bx,2 add di,bx mov cx,[adj2] ; CX = # of 4-pixel sets starting shr cx,2 ; on plane 0 mov bx,[adj1] shr bx,2 sub cx,bx cmp cx,1 jl @@shortLine ; Draw the left edge mov ax,[x1] ; get plane number of pixel #1 and ax,3 jz @@planeZeroStart ; starts at plane zero mov si,ax ; set for pixels mov ah,[leftEdgeMask+si] mov al,MAP_MASK mov dx,SC_INDEX OUT_WORD mov al,[colour] stosb ; Draw the interior stretch @@planeZeroStart: mov ax,0F02h ; enable writes to all planes mov dx,SC_INDEX OUT_WORD mov al,[colour] mov ah,al shr cx,1 jc @@Odd rep stosw ; even number of pixels jmp short @@rightEdge @@Odd: rep stosw ; odd number of pixels stosb ; Draw the right edge @@rightEdge: mov ax,[x2] ; get plane number of last pixel and ax,3 mov si,ax ; set for pixels mov ah,[rightEdgeMask+si] mov al,MAP_MASK mov dx,SC_INDEX OUT_WORD mov al,[colour] stosb @@Exit: pop di si ; clean up and go home leave retf @@shortLine: ; for very small lines mov al,[colour] mov cx,[x1] mov dx,[y] @@Loop: push ax cx dx ; slow loop until done call putPixel_scr_copy C, cx, dx, ax pop dx cx ax inc cx cmp cx,[x2] jle @@Loop pop di si leave retf ENDP PROC C horizLine_mem_copy ARG y:WORD, x1:WORD, x2:WORD, colour:BYTE push edi ; store EDI xor eax,eax ; clear EAX xor edi,edi ; clear EDI xor edx,edx ; clear EDX les di,[outAddr] ; load output address mov ax,[y] mov dx,[outScreenWide] mul edx ; EDX:EAX = offset - EDI - x add edi,eax ; EDI = offset - x mov dx,[x1] add edi,edx ; EDI = offset mov edx,edi ; EDX = offset shr edx,4 ; EDX = # of paragraphs (segments) add dx,[outSeg] ; DX = new segment mov es,dx ; ES = new segment and di,0000000000001111b ; DI = offset within new segment mov al,[colour] ; colour in AL mov ah,al ; colour in AH mov bx,ax shl eax,16 mov ax,bx ; colour in each byte of EAX mov cx,[x2] sub cx,[x1] inc cx ; CX = line length in pixels mov dx,cx ; DX = line length in bytes shr cx,2 ; CX = line length in dwords rep stosd ; store four bytes at a time mov cx,dx ; CX = line length in pixels and cx,0000000000000011b ; CX = any remaining bytes rep stosb ; store the remaining bytes pop edi ; restore EDI leave ; clean up retf ; return ENDP ;***** ;***** setPaletteReg ;***** PROC C setPaletteReg ARG palNum:WORD,red:BYTE,green:BYTE,blue:BYTE mov bx,[palNum] mov dx,3C8h ; set for the right palette register mov ax,[palNum] out dx,al inc dx mov al,[red] ; red shr al,2 jnc @@L1 cmp al,63 je @@L1 inc al @@L1: out dx,al mov al,[green] ; green shr al,2 jnc @@L2 cmp al,63 je @@L2 inc al @@L2: out dx,al mov al,[blue] ; blue shr al,2 jnc @@L3 cmp al,63 je @@L3 inc al @@L3: out dx,al leave retf ENDP ;***** ;***** getPaletteReg ;***** PROC C getPaletteReg ARG palNum:WORD,red:DATAPTR,green:DATAPTR,blue:DATAPTR push ds si mov dx,3C7h ; set for right palette register mov ax,[palNum] out dx,al mov dx,3C9h in al,dx ; red lds si,[red] shl al,2 mov [ds:si],al in al,dx ; green lds si,[green] shl al,2 mov [ds:si],al in al,dx ; blue lds si,[blue] shl al,2 mov [ds:si],al pop si ds leave retf ENDP ;***** ;***** setBlockPalette ;***** PROC C setBlockPalette ARG firstReg:WORD,lastReg:WORD,paletteData:DATAPTR push ds si lds si,[paletteData] ; set up mov dx,3C8h mov ax,[firstReg] out dx,al inc dx mov cx,[lastReg] ; CX = number of registers sub cx,ax inc cx cld @@LLoop: lodsb ; red shr al,2 jnc @@L1 cmp al,63 je @@L1 inc al @@L1: out dx,al lodsb ; green shr al,2 jnc @@L2 cmp al,63 je @@L2 inc al @@L2: out dx,al lodsb ; blue shr al,2 jnc @@L3 cmp al,63 je @@L3 inc al @@L3: out dx,al loop @@LLoop @@LExit: pop si ds leave retf ENDP ;***** ;***** getBlockPalette ;***** PROC C getBlockPalette ARG firstReg:WORD,lastReg:WORD,paletteData:DATAPTR push di les di,[paletteData] ; set up mov dx,3C7h mov ax,[firstReg] out dx,al mov dx,3C9h mov cx,[lastReg] ; CX = number of registers sub cx,ax inc cx cld @@L1: in al,dx shl al,2 stosb ; red in al,dx shl al,2 stosb ; green in al,dx shl al,2 stosb ; blue loop @@L1 @@LExit: pop di leave retf ENDP ;***** ;***** clearGraphics ;***** PROC C clearGraphics_scr_copy ARG colour:BYTE mov dx,SC_INDEX mov ax,0F02h out dx,ax ; enable writes to all four planes mov ax,0A000h mov es,ax xor di,di cld mov cx,9600 mov al,[colour] mov ah,al rep stosw leave retf ENDP ENDS END