Software Vault: The Games Collection 1

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Assembly Source File | 1993-08-20 | 31KB | 1,589 lines

; 320x400x256 (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 = 400 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 0 ; 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 0 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 399 maxColour dw 255 ; maximum colour number xRatio dw 4 ; aspect ratio 4:5 (320:400 in yRatio dw 5 ; lowest terms) bitsPerPixel dw 8 ; 8 bits per pixel inMaxX dw 319 ; current input screen dimensions inMaxY dw 399 outMaxX dw 319 ; current output screen dimensions outMaxY dw 399 inScreenWide dw ? ; needed only for virtual screens outScreenWide dw ? ;*** Viewport information inViewportULX dw 0 inViewportULY dw 0 inViewportLRX dw 319 inViewportLRY dw 399 outViewportULX dw 0 outViewportULY dw 0 outViewportLRX dw 319 outViewportLRY dw 399 ;*** 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 400 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 MACRO CONSTANT_TO_INDEXED_REG ADDRESS, INDEX, VALUE mov dx,ADDRESS mov ax,(VALUE shl 8) + INDEX OUT_WORD ENDM ;***** ;***** initGraphics ;***** PROC C initGraphics mov ax,0013h ; set mode 13h int 10h ; change CPU addressing to linear mov dx,SC_INDEX mov al,MEMORY_MODE out dx,al inc dx in al,dx and al,NOT 08h ; turn off chain 4 or al,04h ; turn off odd/even out dx,al mov dx,GC_INDEX mov al,GRAPHICS_MODE out dx,al inc dx in al,dx and al,NOT 10h ; turn off odd/even out dx,al dec dx mov al,MISCELLANEOUS out dx,al inc dx in al,dx and al,NOT 02h ; turn off chain out dx,al ; clear all 256k of video RAM CONSTANT_TO_INDEXED_REG SC_INDEX, MAP_MASK, 0Fh ; enable writes to all planes mov ax,0A000h mov es,ax xor di,di mov ax,di mov cx,8000h ; # of words in 64k cld rep stosw ; clear all of display RAM ; Tweak the mode to 320x400 by not scanning each line twice mov dx,CRTC_INDEX mov al,MAX_SCAN_LINE out dx,al inc dx in al,dx and al,NOT 1Fh ; set max scan line to 0 out dx,al dec dx ; Change CRTC scanning from DWORD to BYTE mode, allowing the CRTC to scan ; more than 64k of video data. mov al,UNDERLINE out dx,al inc dx in al,dx and al,NOT 40h ; turn off doubleword out dx,al dec dx mov al,MODE_CONTROL out dx,al inc dx in al,dx or al,40h ; turn on byte mode bit out dx,al mov al,[inited] ; restore palette if necessary or al,al jz @@notInited mov ax,1 retf @@notInited: mov [inited],1 push si 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 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,16000 mov al,[colour] mov ah,al rep stosw leave retf ENDP ENDS END