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Index > DOS > Basic graphical output in fasm -help needed-

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sylwek32



Joined: 27 Apr 2006
Posts: 339
sylwek32
Hello
i wanted to ask you some questions about dos graphics programming.

1st question:
How to initialize to Screen 12 ?

2nd question:
How to put a pixel on the screen ?

3nd question:
How to make a blurry effect?

4th question:
How to make a starfield simulation?
Post 24 Oct 2006, 18:33
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Dex4u



Joined: 08 Feb 2005
Posts: 1601
Location: web
Dex4u
One ? why do you want to use mode 12h ?, this mode is a lot of work, you would be better off using mode 13h or vesa modes.
Post 24 Oct 2006, 22:00
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vid
Verbosity in development


Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia
vid
or learn VGA programming Smile
Post 24 Oct 2006, 22:36
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sylwek32



Joined: 27 Apr 2006
Posts: 339
sylwek32
and can you tell me how to do this in mode 13h or a vesa mode?
Post 24 Oct 2006, 23:26
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rhyno_dagreat



Joined: 31 Jul 2006
Posts: 487
Location: Maryland, Unol Daleithiau
rhyno_dagreat
Here's what I can provide:

Code:
org 100h

mov ah, 00 ;Function for changing graphics modes
mov al, 13h ;screen 13
int 10h ;use int 10h with that function

mov bx, 0A000h ;move video memory location
mov es, bx ;into extra segment 

mov bx, 0 ; make offset 0
mov al, 1 

mov cx,64000

startloop:
mov [es:bx], al ;move al, which is the color the pixel is, into place in vidmem
inc bx ; increment place in video memory
loop startloop

mov bx, 0
add bx, 36000
mov al, 3
;mov dx, 64000

mov cx, 28000
taskbarloop:
mov [es:bx], al
inc bx
loop taskbarloop

done:
ret

mov ax, 0100h
int 21h
int 20h


    


Hope it helps!
Post 25 Oct 2006, 00:26
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Dex4u



Joined: 08 Feb 2005
Posts: 1601
Location: web
Dex4u
Or you do it like this
Code:
;31 byte fasm starfield        org 100h        use16 start:         mov     al,13h ;mode 13h         int     10h          mov     bx,0xa000 hidden_ret:         mov     es,bx genstar:         in      al,40h                   aaa scroll:         sbb     di,ax         stosb         loop    genstar         mov     ah,1                     int     16h         jnz     hidden_ret + 1         xor     ax,ax                     xchg    al,[es:di]         inc     cx         jmp     scroll              
Post 25 Oct 2006, 00:44
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sylwek32



Joined: 27 Apr 2006
Posts: 339
sylwek32
thanks..
i programmed a 32 byte tv-simulator.. (noize)
Post 25 Oct 2006, 00:59
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JapanLover



Joined: 17 Oct 2006
Posts: 8
JapanLover
here is a 20byte star field i found on some website thinger...

Code:
org 256
start:
mov al,13h
int 10h
pop sp
pop cx
pop ds
lp1:
pop ax
aaa
lp2:
xchg [di],al
add di,ax
loop lp1
inc di
cbw
inc cx
jmp lp2    


a little busy looking, but still a starfield...

(Dex, your's is prettier =) )
Post 25 Oct 2006, 01:13
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sylwek32



Joined: 27 Apr 2006
Posts: 339
sylwek32
try changing mov al,13h to mov al,12h Very Happy
Post 25 Oct 2006, 01:21
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JapanLover



Joined: 17 Oct 2006
Posts: 8
JapanLover
sylwek32 wrote:
try changing mov al,13h to mov al,12h Very Happy


ah, much more star like, heh...

i like =)

edit:

got that originally from http://www.df.lth.se/~john_e/fr_gems.html they have a lot of nice stuff that i haven't even looked at...

enjoy =)
Post 25 Oct 2006, 02:39
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