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0090_RE: PLASMA (revisited).pas
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Pascal/Delphi Source File
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1994-05-25
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4KB
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169 lines
{
{TITLE: Plasma FROM: Kaare Boeegh DATE: Sun Apr 17 1994 08:25 pm}
{$A+,B-,D-,E-,F+,G+,I-,L-,N-,O-,R-,S-,V-,X-}
PROGRAM plasma;
CONST ys : BYTE = 0;
yt : BYTE = 255;
VAR ft : ARRAY [0..512] OF BYTE;
sint : ARRAY [0..256] OF BYTE;
i1,a,b,d,c,od,color,e,y : BYTE;
x,k,i : WORD;
PROCEDURE do_tables;
VAR i : WORD;
BEGIN
FOR i := 0 TO 512 DO FT [i] := ROUND(64+63*SIN(i/40.74));
FOR i := 0 TO 256 DO SINT [i] := ROUND(128+127*SIN(i/40.74))-1;
END;
PROCEDURE do_palette;
VAR i : WORD;
BEGIN
PORT[$3C8] := 0;
FOR i := 0 TO 255 DO
BEGIN
PORT[$3C9] := i DIV 4;
PORT[$3C9] := i DIV 6;
PORT[$3C9] := i DIV 8;
END;
END;
BEGIN
ASM
mov al,ys
mov y,al
mov ax,0013h;
int 10h; {Set Mode $13}
mov dx,3d4h {Go into Double Height Pixel Mode}
mov al,9
out dx,al
inc dx
in al,dx
and al,0e0h
add al,3
out dx,al
call do_palette;
call do_tables;
@3: inc i1 {Main Loop} {Grid Counter}
sub c,2
inc od
mov al,od
mov d,al
mov al,ys {Alternate Starting Position every pass}
mov ah,yt
xchg al,ah
mov ys,al
mov ah,yt
mov y,al
@2: mov al,y {Calculate Offset and add one every second line}
mov bx,320
mul bx
mov bx,ax
mov al,y
mov ah,0
and al,1
add ax,bx
mov k,ax
mov al,i1 {move grid one pixel down every second frame}
mov ah,0
and al,1
mov ah,0
mov bx,320
mul bx
mov bx,k
sub bx,ax
mov k,bx
mov al,d
add al,2
mov d,al
mov al,c {[(c}
add al,y {+y)}
and ax,255 {and 255]}
mov di,offset sint {get sint mem location}
add di,ax {[c+y] and 255}
mov al,ds:[di] {sint[(c+y) and 255]}
mov a,al
mov di,offset sint
mov al,d
and al,255
add di,ax
mov al,ds:[di]
mov b,al
mov ax,0
mov bx,0
mov cx,0
@1: mov di,offset ft {get ft mem location}
mov al,a {a}
add al,b {+b}
add di,ax {[a+b]}
mov al,ds:[di] {ft[a+b]}
mov bx,ax {Store}
inc bx {+1}
mov di,offset ft {get ft mem location}
mov al,y {y}
add al,b {+b}
add di,ax {[y+b]}
mov ax,ds:[di] {ft[y+b]}
add ax,bx {+}
mov color,al {color:=}
mov bx,0a000h {screen memory location}
mov es,bx {mov it to es}
mov di,k {k is screen offset}
mov es:[di+80],al {plot color to screen}
{ ^^ center}
mov al,b
add al,2
mov b,al
mov ax,k {Ofs of Plasma Pixel, Increased by 2 to Create the Grid}
add ax,2
mov k,ax
mov ah,0 {INC(a,1+color SHR 7);}
mov al,color
shr al,7
add al,1
mov ah,0
mov bl,al
mov al,a
add al,bl
mov a,al
inc cx
cmp cx,80 {160}
jnz @1 {inner loop}
inc y
cmp y,101
jnz @2 {outer loop, number of lines}
mov ah,01h
int 16h
jz @3 {get keypress}
mov ax,03h {mode 3}
int 10h
END;
END.
-----------------------------------------------------------------------------
Shipley
--- Synchronet
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