assembly/dino.asm

SYS_EXIT equ 1
SYS_READ equ 3
SYS_WRITE equ 4
STDIN equ 0
STDOUT equ 1
SYS_IOCTL equ 54

section .bss
	sz RESB 4 ; 4 byte for window size
	num resb 4 ;4 byte for ascii numbers
	srow resb 1;
	scol resb 1;
section .data
	ha db 0 ;hundreds
	ta db 0 ;tens
	rcount db 0;
	lb db 0xa; linebrak
	tof db 0;	; top offset
	lof db 0;	; left offset
	gh db 42;	; game height
	gw db 102;	; game width
	scrst db 'Score: 000'	; score string
	scrstln equ $ - scrst	; sore string length
	scrlof equ 5		;score lfet offset
	scrfll equ 85		;score lfet offset
	pls db 0x2b		;plus for corner
	hl db 0x2d		;horizontal line |
	vl db 0x7c		;vertical line -
	
	
section .text
	global _start
		
_start:
	; get windwo size	
	mov eax, SYS_IOCTL	; syscall ioctl
	mov ebx, STDOUT		; stdout for something?
	mov ecx, 0x5413		; get windowsize command TIOCGWINSZ
	mov edx, sz		; target struct
	int 0x80		; call kernel

	;print fullscreen

	;save window size
	mov al, [sz]
	mov [srow], al
	mov al, [sz+2]
	mov [scol], al
	call print
	jmp exit

	;calc offset
	;top	
	mov ax, [srow]
	sub ax, [gh]
	mov cl, [0x2]
	div cl
	mov [tof], al

	;left
	mov ax, [scol]
	sub ax, [gw]
	mov bl, 0x2
	div bl
	mov [lof], al

	;print terminal
print:

topoffset:
	mov eax, SYS_WRITE
	mov ebx, STDOUT
	mov ecx, lb
	mov edx, 1
	int 0x80

	inc byte [rcount]
	mov al, [rcount]
	cmp al, [tof]
	jl topoffset

toprow:	 
tlcorner:
	mov eax, SYS_WRITE
	mov ebx, STDOUT
	mov ecx, pls
	mov edx, 1
	int 0x80

tr_start:
	mov eax, SYS_WRITE
	mov ebx, STDOUT
	mov ecx, hl
	mov edx, 1
	int 0x80

	inc byte [rcount]
	mov al, [rcount]
	cmp al, scrlof
	jl tr_start
	mov al, 0
	mov [rcount], al
	
tr_score:
	mov eax, SYS_WRITE
	mov ebx, STDOUT
	mov ecx, scrst
	mov edx, scrstln
	int 0x80

tr_fill:
	mov eax, SYS_WRITE
	mov ebx, STDOUT
	mov ecx, hl
	mov edx, 1
	int 0x80

	inc byte [rcount]
	mov al, [rcount]
	cmp al, scrfll
	jl tr_fill

trcorner:
	mov eax, SYS_WRITE
	mov ebx, STDOUT
	mov ecx, pls 
	mov edx, 1
	int 0x80

linebreak:
	mov eax, SYS_WRITE
	mov ebx, STDOUT
	mov ecx, lb 
	mov edx, 1
	int 0x80

exit:
	;exit
	mov eax, 1
	mov ebx, 0
	int 0x80

	; print rows
	
	mov ecx, 0
	mov cl, [sz]		;rows in ecx

hundreds:
	mov ebx, 100
	cmp ecx, ebx		;check if above 100
	js bla
	jae inchundred		;jump to increment hundreds if needed
	

bla:
	mov eax,[ha]		;hundred count to eax
	add eax, '0'		;convert to ascii
	mov [num+0], eax	;move to first byte of num string

tens:
	cmp ecx, 0xa		;check if above 10
	jge inctens		;jump to increment tens if needed
	
	mov eax,[ta]
	add eax, '0'
	mov [num+1], eax

	mov eax, ecx
	add eax, '0'
	mov [num+2], eax	
	mov [num+3], byte 0xa 	;linebreak

	mov eax, SYS_WRITE
	mov ebx, STDOUT
	mov ecx, num
	mov edx, 4
	int 0x80


	;print hundreds
	;mov eax, [ha]
	;add eax, '0'
	;mov[ha], eax
	
	;mov eax, SYS_WRITE
	;mov ebx, STDOUT
	;mov ecx, ha
	;mov edx, 1
	;int 0x80	

	; print cols

	;mov eax, SYS_WRITE
	;mov ebx, STDOUT
	;mov ecx, sz+2
	;mov edx, 3
	;int 0x80

inchundred:
	inc byte [ha]		;increment hundreds
	sub ecx, 0x64
	jmp hundreds

inctens:
	inc byte [ta]		;increment tens
	sub ecx, 0xa
	jmp tens