Added mine generation and adjustments to the field drawing
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0889c59d68
commit
f520739529
1 changed files with 30 additions and 37 deletions
67
mine.asm
67
mine.asm
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@ -10,8 +10,8 @@ stack $3000
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COLUMNS = 8
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LINES = 8
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FIELDX = 02h
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FIELDY = 02h
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FIELDX = 16
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FIELDY = 4
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;Code
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@ -36,37 +36,34 @@ start:
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drawfield:
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mov cx, 00h
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mov ax, 00h
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call getbmp
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; mov bx, covercell
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drawfieldloop:
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push cx
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push ax
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call getbmp
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add cx, FIELDY ; Make sure we get the field displaced correctly
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add ax, FIELDX
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call drawbox
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pop ax
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pop cx
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inc cx
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call getbmp
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cmp cx, 0Ah
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cmp cx, COLUMNS
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jne drawfieldloop
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mov cx, 0'h
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mov cx, 0h
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inc ax
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call getbmp
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cmp ax, 0Ah
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cmp ax, LINES
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jne drawfieldloop
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ret
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getbmp:
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mov bx, map ; Store the base of the map in BX
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push ax ; Don't mangle AX
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mov ax, COLUMNS ; How many columns an AX
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mul cx ; So we now multiply CX (Y coord) by COLUMNS
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add bx, cx ; Add it to the pointer
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pop ax ; Recover AX (X coord)
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add bx, ax ; Add the X coord to BX, now we can read
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cmp bx, 0009h ; There's a mine
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mov bx, map ; Store the base of the map in BX
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push ax ; Don't mangle AX
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mov ax, COLUMNS ; How many columns in AX
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mul cx ; So we now multiply CX (Y coord) by COLUMNS
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add bx, ax ; Add it to the pointer
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pop ax ; Recover AX (X coord)
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add bx, ax ; Add the X coord to BX, now we can read
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cmp word [ds:bx], 0009h ; There's a mine
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jne nomine
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mov bx, minebmp ; Point to the mine bitmap
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mov bx, minebmp ; Point to the mine bitmap
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ret
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nomine:
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mov bx, covercell ; Point to the covered cell
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@ -81,10 +78,10 @@ initseed:
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ret
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random:
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mov ax, 25173 ;LCG multiplier
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mul word [seed] ;DX:AX = LCG multiplier * seed
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add ax, 13849 ;Add LCG increment value
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mov word [seed], ax ;Update seed, AX has the random number now
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mov ax, 25173 ;LCG multiplier
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mul word [seed] ;DX:AX = LCG multiplier * seed
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add ax, 13849 ;Add LCG increment value
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mov word [seed], ax ;Update seed, AX has the random number now
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ret
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;This is thought to pick up from the registers the address of what we need to draw
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@ -106,7 +103,6 @@ drawbox:
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mov cx, 00
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mov ax, 00
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mov dx, 00
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drawloop:
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mov al, byte [ds:bx] ;Current address in BX
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mov byte [es:si], al ;Put the pixel into RAM
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@ -116,12 +112,10 @@ drawloop:
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cmp dx, 08h ;Sort of modulo
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je jumplinedraw ;Time to increment SI in a more complex way
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inc si
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continuecomp:
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cmp cx, 040h ;Compare CX to hex 64 (8x8)
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jne drawloop ;Continue
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ret ;Return
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jumplinedraw:
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mov dx, 00h
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add si, 313 ;Jump a whole line
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@ -131,32 +125,31 @@ jumplinedraw:
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createminefield:
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call initseed ;Make sure we have a good seed
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mov dx, 00h ;DX will be our pointer
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mov bx, [map] ;BX our base pointer
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mov bx, map ;BX our base pointer
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cmfloop:
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push dx ;Save our counters before generating random number
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push bx
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call random ;This leaves a random num in AX
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pop bx
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pop bx ;Recover our counters
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pop dx
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cmp al, 0F0h ;Compare if it's greater than 240
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jg putmine
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cmp al, 0FEh ;Compare if it's greater than 240
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jg putmine ;Put a mine here
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continuecreateminefield:
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inc bx
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add bx, 02h
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inc dx
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cmp dx, COLUMNS * LINES ; Check we have done the whole map
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jne cmfloop
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jl cmfloop
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cmp byte [minecount], 10 ; Check we've put all mines!
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jne createminefield
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jl createminefield
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finishcreateminefield:
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ret ; All is ok
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putmine:
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cmp byte [minecount], 10
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je finishcreateminefield
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cmp word [bx], 00009h ;Check memory for placed mine
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jge finishcreateminefield
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cmp word [ds:bx], 00009h ;Check memory for placed mine
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je continuecreateminefield
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mov word [bx], 00009h
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inc byte [minecount]
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mov word [ds:bx], 00009h ;Place mine
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jmp continuecreateminefield
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;This routine checks the map and puts numbers down given the
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@ -266,7 +259,7 @@ minecount: db 0
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;
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;Cell status: 0 covered, 1 uncovered, 2 flagged
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;Cell content: 0 empty, 1-8 number, 9 mine
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map: dw COLUMNS * LINES dup ?
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map: dw COLUMNS * LINES dup 00h
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covercell: db 0fh, 0fh, 0fh, 0fh, 0fh, 0fh, 0fh, 0fh
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db 0fh, 17h, 17h, 17h, 17h, 17h, 17h, 14h
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