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@@ -10,10 +10,11 @@ SYS_TIMER_FD_SETTIME equ 0x145
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section .bss
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sz RESB 4 ; 4 byte for window size
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num resb 4 ;4 byte for ascii numbers
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- srow resb 1;
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- scol resb 1;
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+ srow resb 1 ;screen rows
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+ scol resb 1 ;screen columns
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+ tof resb 1 ; 1 byte store top offstet
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- tmp resb 4
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+ tmp resb 1
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section .data
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;num to ascii variables
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@@ -23,7 +24,6 @@ section .data
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;graphics layout
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rcount db 0;
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lb db 0xa; linebrak
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- tof db 0; ; top offset
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lof db 0; ; left offset
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gh db 42; ; game height
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gw db 102; ; game width
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@@ -100,25 +100,31 @@ _start:
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;calc offset
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;top
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xor eax, eax
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- xor bl, bl
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+ xor bx, bx
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mov ax, [srow]
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- and ax, 0x0F ; bitmask so that only srow (1byte) is inside ax (2byte) else it is scol+srow
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- ;sub ax, [gh] ;screenrows - geameheight
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+ and ax, 0xFF ; bitmask so that only srow (1byte) is inside ax (2byte) else it is scol+srow
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+ mov bx, [gh]
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+ and bx, 0xFF
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+ sub ax, bx ;screenrows - geameheight
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mov bl, 2
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div bl
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- ;mov [tof], al
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- jmp exit
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+ mov al, 0x6
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+ mov [tof], al
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+ ;jmp exit
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;left
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mov ax, [scol]
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- sub ax, [gw]
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+ and ax, 0xFF
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+ mov bx, [gw]
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+ and bx, 0xFF
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+ sub ax, bx
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mov bl, 0x2
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div bl
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mov [lof], al
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;print terminal
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print:
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-
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+ jmp topoffset
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emptyterminal:
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mov eax, SYS_WRITE
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mov ebx, STDOUT
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@@ -139,12 +145,12 @@ topoffset:
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mov ebx, STDOUT
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mov ecx, lb
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mov edx, 1
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- int 0x80
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+ ;int 0x80
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inc byte [rcount]
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mov al, [rcount]
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cmp al, [tof]
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- jl topoffset
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+ jle topoffset
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toprow:
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tlcorner:
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