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> DOS > What do you see here? |
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windwakr 06 Jul 2008, 19:09
What do you see when you run this program?
I see a cyclops laying on its side throwing up..  ...but thats just me...(btw, most of the code minus a bit was "borrowed" out of comrades 1kb sinus cirlces thingy here.)
I stumbled upon this while playing around with the source to that program and generated this odd thing. Each pixel basically is : ((sin(x)+sin(distance to center) / 2) + x) / 2 Code:
org 100h
; switch to graphics mode
mov al, 013h
int 10h
push cs
pop es
mov di, dist
mov bx, 200
@@dsty: mov cx, 320
@@dstx: mov [x], cx
mov [y], bx
sub [x], 160
sub [y], 100
fild [x]
fild [x]
fmulp st1,st0
fild [y]
fild [y]
fmulp st1,st0
faddp st1,st0
fsqrt
fistp [x]
mov ax, [x]
stosb
loop @@dstx
dec bx
jnz short @@dsty
; initialize the palette
mov cx, 256
xor ax, ax
@@spal: mov dx, 3C8h
out dx, al
inc dx
out dx, al
out dx, al
out dx, al
inc al
loop @@spal
; main loop
@@main: ; wait for vertical sync
mov dx, 3DAh
@@vs0: in al, dx
test al, 8
jz @@vs0
@@vs1: in al, dx
test al, 8
jnz @@vs1
; draw
push 0A000h
pop es
mov bx, 200
mov si, dist
xor di, di
xor ax, ax
mov [x],0
mov [y],0
@@y: mov cx, 320
mov [x1],0
@@x:
lodsb
mov [y], ax
fild [y]
fdiv [freq]
;fild [counter]
;fsubp st1,st0
fsin
fmul [amp]
fadd [amp]
fistp [y]
fild [x1]
;fiadd [y1]
fdiv [freq]
;fild [counter]
;fsubp st1,st0
fsin
fmul [amp]
fadd [amp]
fistp [x]
mov ax, [x]
add ax,[y]
shr ax,1
add ax,[x1]
shr ax,1
stosb
inc [x1]
loop @@x
inc [y1]
dec bx
jnz @@y
;inc [counter]
; delay
push cs
push 040h
pop ds
mov ax, [ds:6Ch]
@@wait: mov cx, [ds:6Ch]
sub cx, ax
cmp cx, 2
jl @@wait
pop ds
key:
in al,60h
dec al
jnz key
;jnz @@main
; restore text mode
mov ax, 003h
int 10h
ret
;#########################################################################
freq dd 10.0
amp dd 31.0
x dw 0
y dw 0
x1 dw 0
y1 dw 0
counter dw 0
dist:
;#########################################################################
also, try changing: Code: @@x: lodsb mov [y], ax fild [y] fdiv [freq] ;fild [counter] ;fsubp st1,st0 fsin fmul [amp] fadd [amp] fistp [y] fild [x1] ;fiadd [y1] fdiv [freq] ;fild [counter] ;fsubp st1,st0 fsin fmul [amp] fadd [amp] fistp [x] mov ax, [x] add ax,[y] shr ax,1 add ax,[x1] shr ax,1 stosb inc [x1] loop @@x to: Code: @@x: lodsb mov [y], ax fild [y] fdiv [freq] ;fild [counter] ;fsubp st1,st0 fsin fmul [amp] fadd [amp] fistp [y] fild [y1] ;fiadd [y1] fdiv [freq] ;fild [counter] ;fsubp st1,st0 fsin fmul [amp] fadd [amp] fistp [x] mov ax, [x] add ax,[y] shr ax,1 add ax,[y1] shr ax,1 stosb inc [x1] loop @@x Are these boards dying? I've been gone since mid june(no internet  ) and doesn't look like much has gone on since then.
Wooooo......4 years as a registered user and only 50 some posts lol |
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06 Jul 2008, 19:09 |
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comrade 07 Jul 2008, 01:55
windwakr wrote:
What you invented there is a class of graphics demos called "plasmas" 
Those used to be real popular in late 80s/early 90s in the demo-scene world. Its a rather easy effect: add a bunch of sine-waves of different periods, index into a gradient palette table. Do a phase-shift on the sine-waves for animation. Check Hornet (these days accessible at http://www.scene.org/dir.php?dir=%2Fmirrors%2Fhornet%2Fcode%2Feffects%2Fplasma/) for more demos of this sort. You will probably need a MS-DOS VM with something like Turbo C and TASM installed to play with the sources Though I think most stuff still runs fine under NTVDM. |
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07 Jul 2008, 01:55 |
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comrade 07 Jul 2008, 01:56
If really get interested in that kinda stuff, also check http://www.pouet.net/ or ask around in #coders on IRCnet.
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07 Jul 2008, 01:56 |
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bitRAKE 07 Jul 2008, 02:07
ZOMG - one of the aliens have revealed itself:
Code: @@x: lodsb mov [y], ax fild [y] fdiv [freq] ;fild [counter] ;fsubp st1,st0 fsin fmul [amp] fadd [amp] fistp [y] fild [y1] ;fiadd [y1] fdiv [freq] ;fild [counter] ;fsubp st1,st0 fsin fmul [amp] fadd [amp] fistp [x] add ax,[y] add ax,[x] shr ax,1 jpe .0 add ax,[y1] jmp .1 .0: xadd ax,dx .1: shr ax,1 stosb inc [x1] loop @@x  _________________ ¯\(°_o)/¯ “languages are not safe - uses can be” Bjarne Stroustrup |
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07 Jul 2008, 02:07 |
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windwakr 07 Jul 2008, 02:20
Wow, the forums were hacked? Good thing everythings back to normal(or at least looks normal, I couldn't tell anything had happened)
comrade: Thanks for the links. I'll check them out. bitRAKE: .....WOW..... |
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07 Jul 2008, 02:20 |
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LocoDelAssembly 07 Jul 2008, 02:46
Since I can't provide any better image then I'll contribute a modification on the code
Code: @@dstx: mov [x], cx mov [y], bx sub [x], 160 sub [y], 100 fild [x] ; fild [x] fmul st0, st0 fild [y] ; fild [y] fmul st0, st0 faddp BTW, also try this: Code: @@dstx: mov [x], cx mov [y], bx sub [x], 160 sub [y], 100 fild [x] fabs fild [y] fabs faddp fistp [x] mov ax, [x] stosb loop short @@dstx |
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07 Jul 2008, 02:46 |
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windwakr 07 Jul 2008, 02:54
Ya, that diamond pattern makes it look good.
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07 Jul 2008, 02:54 |
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