TexTorus by Gunnars Farvebio [web]
;A texturemapped torus, doughnut, badering or whatever....
;in 255 bytes
;Programmed, assembled and so on by
;
;MZ1453/GFBx86
;
;Gunnars Farvebio 80x86 department 16/10 2003
;
;Finally GFB(tm) has something to release on our 3rd platform!
;GFB(tm) has been active on Amiga since 1991
;..... inactive since 2001.....
;(re)active on C64 1997-1999... inactive since....
;Now finally on IBM (hopefully not in-)compatible PC.
;
;
;Send constructive critisism and/or your newest production to:
;
; gunslevbrugs@mail.tele.dk
; http://home13.inet.tele.dk/gfbtm
;
;
;Gunnars Farvebio - fordi bunden ikke var nået
;
;
;
;Don't waste time with a disassembler.... the source is here...
.386p
code segment use16
org 0100h
assume cs:code, ds:code;, es:code, ss:code
d equ dword ptr
w equ word ptr
b equ byte ptr
hx=320
hy=200
n=128
start: mov ax,13h
int 10h
push 0a000h
pop es
push 09000h
pop fs
push 08000h
pop gs
;palette
xor al,al
mov dx,03c8h
out dx,al
inc dx
mov cx,256
ipl: mov al,cl
out dx,al
out dx,al
shr al,2
out dx,al
loop ipl
igen:
; mov dx,3dah
;r1: in al,dx
; test al,8
; jz r1
;cls 2bytes....
;slower than 32bit, but smaller...!
xor bx,bx
mov ax,7f7fh
mov cx,hx*hy/2
cls: mov dx,fs:[bx]
mov es:[bx],dx
mov fs:[bx],ax
mov gs:[bx],ax
add bx,2
loop cls
mov di,offset m
mov si,offset temp
; finit
fld d [si+24]
fadd d [di+2]
fst d [si+24]
fstp d [si+20]
mov dx,n*2
dloy:
fldz
fstp d [si]
mov cx,n
dlox:
fld d [si]
fadd d [di+2]
fst d [si]
fsincos ;x0 y0
fiadd w [di+10]
fldz ;z0
fxch st(1) ;x0 z0 y0
fld d [si+20] ;v x z y
call roter ;x z y
mov al,2
rotl: fxch st(2) ;y z x
fxch st(1) ;z y x
fld d [si+24] ;v z y x
call roter ;z y x
dec al
jnz rotl
fimul w [di] ;ym
fistp d [si+4]
fimul w [di] ;xm
fistp d [si+16]
fimul w [di] ;zm
fistp d [si+8] ;z
mov bx,w [si+4]
imul bx,hx
add bx,w [si+16]
add bx,hx/2+hy/2*hx
mov al,cl
or al,dl
mov ah,b [si+8] ;z
call plot
inc bx
call plot
add bx,hx
call plot
dec bx
call plot
faddp st(1) ;si+16
loop dlox
fld d [si+20]
fadd d [di+6]
fstp d [si+20]
dec dx
jnz dloy
mov ah,01H ;get keyboard buffer status
int 16H
jz igen
; ret
roter:
fsincos ;c s x y z
fld st(2) ;x c s x y z
fmul st(0),st(1) ;xc c s x y z
fld st(4) ;y xc c s x y z
fmul st(0),st(3) ;ys xc..
fsubp st(1) ;ys-xc c s..
fxch st(4) ;y c s x ys-xc z
fmulp st(1) ;yc s x ys..
fxch st(2) ;x s yc ys..
fmulp st(1) ;xs yc ys..
faddp st(1) ;xs+ys ys-xc z
ret
plot: cmp ah,gs:[bx]
jge zb0
mov gs:[bx],ah
mov fs:[bx],al
zb0: ret
m dw 24
dc dd 0.05
vy0d dd 0.025
xk dw 2
;c dd ?
;vy0 dd ?
temp equ 640
code ends
end start
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