Original post by Coder, taken from DBF ezboard forum.
Assembly Language - 2D
Is there any way to do 2D directly in asm without using an external dll?
I haven't been able to find much on this kind of stuff. Obviously, I just want
some way to plot a coloured pixel. Nothing more really, actually
But thanks to rbraz with all his help on OpenGL 3D stuff in Assembly
Language.
I pulled together a little test after studying his tutorial for a
while
Its a little thing thats like Face from Nickelodeon.
(A picture of
face can be found here:
www.danelle.blogspot.com/images.jpg - just
a random google search for a pic, I don't know the site XD)
Yeah, I've been looking for this kind of thing for a while, wanting to put out
a mini 256b or some kind less than 1k just for fun
Its seems like a nice little
challenge.
By the way, I'm using t0a as an assembler. (Actually, the funny thing is that
I'm developing on Linux, and using WINE to run the assembler and my
binaries
)
Thanks
Edited by: coder at: 18/3/06 2:26
rbraz
CBM 128
Posts: 143
(18/3/06 18:37)
Reply
Re: Assembly Language - 2D No problems dude
For doing 256 byte in assembly, the best way is using DOS VGA Mode X (try to find more info about it using Mr. Google)
I've coded a simple sample for you and other people that start learning asm language, compile with "t0a sample.asm +com"
Good luck!
.CPU 386
.BITS 16
.ENTRYPOINT
;---------------------------------------------------
mov al,13h ; VGA mode X
int 10h ; 320x200x256
push 0a000h ; Vga memory
pop es ;
xor di,di ; di = offset
;-------------- Palette
mov dx,3c8h
mov al,32 ;[col]
out dx,al
inc dx
mov al,63 ; [ r ]
out dx,al
mov al,40 ; [ g ]
out dx,al
mov al,0 ; [ b ]
out dx,al
;--------------
mov cx,319 ; loop 319 times
lp1:
mov ax,100 ; y = 100
mov bx,cx ; bx = cx
;-----------------------------------------------------
;WritePixelFast :)
;vgamemory[x + (y*320)] = color ; bx=x, ax=y, cl=color
imul ax,320
add ax,bx
mov di,ax
mov byte [es:di],32 ; color = 32 or cl
mov ax,0 ; clear ax
mov bx,0 ; clear bx
;----------------------------------------------------
loop lp1
sub ah,ah ; Wait any key...
int 16h ;
;-----------Exit to DOS
mov ax,4c00h
int 21h
Edited by: rbraz at: 18/3/06 18:40
coder
ATARI 2600
Posts: 19
(18/3/06 18:40)
Reply RE Thanks a lot rbraz!
Had been sitting here patiently seeing your name at the bottom
crossing my fingers hoping you would post here
I'll try that out.
Is there any cheat-sheet or something you know
of where it explains what all the registers hold and stuff like that?
I think I'm getting the hang of asm with t0a, which is a nice assembler
Thanks in advance.
EDIT:
Maybe by getting some prods out in the showcase and some code in the
code arcs, this place can be revived to its former glory, at least as a demo
coding community for anyone any level
Edited by: coder at: 18/3/06 18:42
coder
ATARI 2600
Posts: 20
(18/3/06 18:47)
Reply Re: RE Ohhh! I can use t0a in Linux now but for Windows! Yay!
What I do:
- Code in vi in Linux (My favorite)
- Use WINE to "emulate" t0a compiling
- Use DosBOX to emulate the final product
Yay!!!!
EDIT: Sorry for double post! I was excited
Edited by: coder at: 18/3/06 18:48
rbraz
CBM 128
Posts: 146
(18/3/06 19:08)
Reply
Re: RE No probs !
It's too difficult to tell you a best place to learn Asm, try to find some good tutorials using Google.
I'm not good teaching people, but if you have some troubles ask here, and maybe other people start learning too and share all their knowledge
rbraz
CBM 128
Posts: 148
(19/3/06 16:37)
Reply
Re: RE I found a webpage with useful information about asm:
www.dd.chalmers.se/~f99la...nload.htmlTake a look at "General graphics tutorials..." section.
The tutorial by Adam's is very good, one of the best.
www.dd.chalmers.se/~f99la...smtuts.zipEdited by: rbraz at: 19/3/06 16:42
coder
ATARI 2600
Posts: 22
(19/3/06 20:08)
Reply Re: RE Wow! Thanks!
Some nice stuff there!
Thygrion
DBF: Coder
Posts: 354
(10/4/06 3:00)
Reply
Re: RE As far as I know, I prefer using VGA Mode 13h (X as RBraz calls it), but it is only 256 colors and requires a palette generator (unless you like ugly effects
), but if I were you I'd research tinyptc or openptc - yes, openptc is a dll, but tinyptc is very easy to use and doesn't require one. I use tinyptc for 64 and 32 k intros in freebasic and it's blazing as far as speed.
But I'm very surprised you jumped straight from blitz to assembly - you should try C++, as it's basicly just a high-level assembly language first.
Finally 14!!
Thygrion
DBF: Coder
Posts: 355
(10/4/06 3:05)
Reply
Re: Assembly Language - 2D I wrote an overhead voxel routine in assembly for use in a tinyintro awhile back, but I'll need a better texture to fill in the rest of the 256 bytes.
Anyway I thought you may want to have a look - hope it helps you.
NASM (netwide assembler [32-bit DOS binaries]) compiles.
; Overhead Voxels
[org 100h]
[section .text]
mov al,13h
int 10h
push 0a000h
pop es
mov ax,cs
add ah,10h
mov fs,ax
mov dx,3c8h
xor ax,ax
out dx,al
inc dx
PAL push ax
shr al,3
add al,31
out dx,al
out dx,al
mov al,63
out dx,al
pop ax
inc al
jnz PAL
mov cl,192
xor bx,bx
TEX mov al,bl
and al,bh
shr al,4
and al,1
mul cl
add al,60
mov [fs:bx],al
inc bx
jnz TEX
MAIN push bx
xor di,di
mov dx,-100
YLOOP mov bp,-160
XLOOP fninit
mov [si],word 160
fild word [si]
mov [si],dx
fild word [si]
fdiv st0,st1
mov [si],bp
fild word [si]
fdiv st0,st2
pop bx
push bx
mov [si],bx
fild word [si]
fild word [si]
mov [si],word 128
fidiv word [si]
fldpi
fmulp st1
fsin
mov [si],word 64
fimul word [si]
mov al,255
RAYC fld st3
faddp st2,st0
fadd st0,st2
fld st1
fistp word [si]
mov bx,[si]
mov bh,bl
fist word [si]
mov cx,[si]
mov bl,cl
mov cl,[fs:bx]
cmp al,cl
jbe RAYH
dec al
jnz RAYC
RAYH mov ah,255
sub ah,al
mov [es:di],ah
inc di
inc bp
cmp bp,160
jnz XLOOP
inc dx
cmp dx,100
jnz YLOOP
pop bx
dec bl
mov ah,01
int 16h
jz MAIN
mov ax,4c00h
int 21h
contact me if you need any explanations [PM] .
Finally 14!!
Edited by: Thygrion at: 10/4/06 3:11
rbraz
CBM 128
Posts: 161
(10/4/06 19:39)
Reply
Re: Assembly Language - 2D Run extremely slow here, dunno why, but nice visual anyway.
Thygrion
DBF: Coder
Posts: 356
(11/4/06 1:13)
Reply
Re: Assembly Language - 2D it is a very slow routine, since it's per-pixel raycasting. with a better texture that can be improved, but not much.
Finally 14!!
relsoft
VIC 20
Posts: 6
(27/4/06 12:00)
Reply Re: Assembly Language - 2D Try FASM
Flatassembler.net
Here are 3 asm 256 demos I made one afternoon and night.
board.flatassembler.net/topic.php?t=5121
5H0CKW4VE
*Administrator*
Posts: 8054
(27/4/06 15:44)
Reply
ezSupporter
Re: Assembly Language - 2D Nice stuff
¤´¨)
¸.·´¸.·*´¨) ¸.·*¨)
(¸.·´ (¸.·`¤... SHOCKWAVE / DBF...¤
VISIT DARK BIT FACTORY INTERACTIVE! (please!)
rbraz
ATARI ST
Posts: 209
(27/4/06 15:45)
Reply
Re: Assembly Language - 2D Yeah, very good !
