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rel Mon Apr 3 2006 at 6:50 pm
Just added a center displacement...
;*************************************** **************************
; tunnel by rel
; Assemble with fasm
; Http://Rel.Betterwebber. com
;*********************************** ******************************
diameter equ 64
diamxscale equ 64 * diameter
scale equ 256
org 100h
frame dw 0
ishort dw 0
short_var dw 0
scx dw 0
scy dw 0
;************************************* ****************************
;************************************* ****************************
;************************************* ****************************
push word 0a000h
pop es
mov ax, 0013h ; mode 13h
int 10h ; we are now in 320x200x256
fninit
;====set palette
mov dx, 03c8h ;palette write register
out dx, al ;send value
inc dx ;0x3c9(write RGB values)
mov cx, 256 ;whole 256 colors
fldpi ;st0 = pi
mov [ishort], 180 ;st0 = 180, st1 = pi
fild [ishort]
palloop:
mov bx, 256
sub bx, cx
shl bx,1
mov [ishort], bx
fild [ishort] ;st0 = deg, st1 = 180, st2 = pi
fmul st0, st2
fdiv st0, st1
fsin ;st0 = sin(rad)
mov [ishort], 64
fimul [ishort]
fistp [ishort]
mov ax, [ishort]
out dx, al ;red
shl al,1 ;blue
out dx, al
shr al, 2
out dx, al ;than green
loop palloop ;go back if not 0
fstp st0
fstp st0
MainLoop:
mov [scx],160
mov [scy],100
inc [frame]
;displacement
fild [frame]
mov [ishort], 50
fidiv [ishort]
fsin
mov [ishort], 120
fimul [ishort]
fistp [ishort]
mov ax, [ishort]
add [scx], ax
fild [frame]
mov [ishort], 60
fidiv [ishort]
fsin
mov [ishort], 80
fimul [ishort]
fistp [ishort]
mov ax, [ishort]
add [scy], ax
;===========tunnel
mov dx,200
mov di, 0
tunnel_yloop:
mov cx,320
tunnel_xloop:
;atan2
fldpi ;st0 = pi
mov ax, [scy]
mov [short_var], ax
sub [short_var], dx
fild [short_var] ;st0 = dy, st1 = pi
mov ax, [scx]
mov [short_var], ax
sub [short_var], cx
fild [short_var] ;st0 = dx, st1 = dy, st2 = pi
fpatan ;st0 = atan(dy/dx) = atan(st1/st0)
mov [short_var], scale
fimul [short_var] ;atan(st0))*256/pi
fdiv st0, st1
fistp [short_var] ;short_var = scaledpi
mov ax, [scx]
sub ax, cx ;cmx
mov [ishort], ax
fild [ishort] ;st0 = cmx
fmul st0, st0 ;cmx * cmx
mov ax, [scy]
sub ax, dx
mov [ishort], ax
fild [ishort] ;st0 = cmy st1 = cmx*cmx
fmul st0, st0 ;cmy * cmy
fadd st0, st1 ;st0 cmx^2 + cmy^2
fsqrt ;sqrt st0
mov [ishort], diamxscale ;st0 = diamxscale st1 = sqrt(dist)
fild [ishort]
fdiv st0, st1
fistp [ishort]
fstp st0
fstp st0
fstp st0
mov ax, [ishort]
mov bx, [short_var]
add ax, [frame]
add bx, [frame]
xor ax, bx
mov [es:di], al
inc di
loop tunnel_xloop
dec dx
jnz tunnel_yloop
mov ah, 01h ; check for keypress
int 16h ; is a key waiting in the buffer?
Jz MainLoop
;textmode
mov ax, 0003h
int 10h
mov ax, 004ch
int 21h
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