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{
This program is part of the FPC demoes.
Copyright (C) 1999 by Marco van de Voort
A port of a more "dirty" graphical program, to demonstrate
some Go32 features. The program displays a landscape in which
you can move with the cursorkeys
See the file COPYING.FPC, included in this distribution,
for details about the copyright.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
**********************************************************************
The sources for this game was found in SWAG, and was also posted to the
International FIDO Pascal area.
I assume that it is PD (both sources said nothing about the form of copyrights,
but it was contributed to SWAG, which is generally PD)
If there is somebody that claims authorship of these programs,
please mail marco@freepascal.org, and the sources will be removed from our
websites.
------------------------------------------------------------------------
There was no real original, I reconstructed some from several versions.
A voxel source from Swag patched for FPC.
- The original author was unknown. I saw a different version which named
"Borek" (Marcin Borkowski), 2:480/25 as author.
- Bas van Gaalen donated it to SWAG.
- I, Marco van de Voort made some small FPC adjustments.
- However one problem remained (wrapping of arrays), and Jonas Maebe mailed me
that glitch to me. This practically meant putting all those WORD()
typecasts in the array-parameters.
Still BP compatible, Gameunit contains some BP alternatives for Go32
procedures needed.}
PROGRAM voxel;
{$R-}
USES Crt,Dos {$IFDEF FPC}, Go32{$ENDIF};
type lrgarr=array[0..65534] of byte;
const
pal:array[1..384] of byte=(
0,0,0,48,48,48,1,0,43,1,3,43,2,5,44,2,7,44,3,9,45,4,11,46,5,13,47,6,15,48,
7,17,49,8,19,50,9,21,51,10,22,52,11,24,52,12,26,54,13,28,54,14,30,56,15,32,
56,16,34,58,17,34,58,17,36,58,18,38,60,19,40,60,20,42,62,21,44,62,10,31,0,
11,31,0,11,31,1,11,32,1,12,32,1,12,32,2,12,33,2,13,33,2,14,33,3,15,33,3,15,
34,3,15,34,4,15,35,4,16,35,4,16,35,5,16,36,5,17,36,5,17,36,6,18,37,6,18,38,
7,19,38,8,20,39,8,20,40,9,21,40,10,22,41,10,22,42,11,23,42,12,24,43,12,24,
44,13,25,44,14,25,45,14,26,46,15,27,46,16,27,47,17,28,47,18,28,48,19,29,49,
19,30,49,20,30,50,21,31,51,21,32,51,22,32,52,23,33,53,23,34,53,24,34,54,25,
35,55,25,36,55,26,36,56,27,37,57,27,38,57,27,39,57,27,41,57,27,42,57,27,43,
57,27,44,57,27,45,57,27,46,57,27,47,57,27,49,57,27,50,57,27,51,57,27,52,57,
27,53,57,27,55,57,27,56,57,27,57,57,27,58,57,27,58,57,26,58,57,25,58,57,24,
58,56,23,58,55,22,58,54,20,58,53,19,58,51,18,58,50,17,58,50,16,58,49,15,58,
48,14,58,47,13,58,46,12,58,45,11,58,44,11,58,44,10,58,43,10,58,42,9,57,41,
8,57,40,8,56,39,7,56,38,6,55,37,5,55,35,4,54,33,4,54,31,2,32,32,32,63,63,63,
63,63,63,63,63,63,63,63,63,48,48,48,63,63,63,63,63,63);
VAR
MP,Scr : ^lrgarr;
rng : array[0..320] of byte;
dir,i,x,y : integer;
function ncol(mc,n,dvd:integer):integer;
var loc:integer;
begin
loc:=(mc+n-random(2*n)) div dvd; ncol:=loc;
if loc>250 then ncol:=250; if loc<5 then ncol:=5
end;
procedure plasma(x1,y1,x2,y2:word);
var xn,yn,dxy,p1,p2,p3,p4:word;
begin
if (x2-x1<2) and (y2-y1<2) then
exit;
p1:=mp^[WORD(256*y1+x1)]; p2:=mp^[WORD(256*y2+x1)]; p3:=mp^[WORD(256*y1+x2)];
p4:=mp^[WORD(256*y2+x2)]; xn:=((x2+x1) shr 1) and $ffff; yn:=((y2+y1) shr 1) and $ffff;
dxy:=5*(x2-x1+y2-y1) div 3;
if mp^[WORD(256*y1+xn)]=0 then mp^[WORD(256*y1+xn)]:=ncol(p1+p3,dxy,2);
if mp^[WORD(256*yn+x1)]=0 then mp^[WORD(256*yn+x1)]:=ncol(p1+p2,dxy,2);
if mp^[WORD(256*yn+x2)]=0 then mp^[WORD(256*yn+x2)]:=ncol(p3+p4,dxy,2);
if mp^[WORD(256*y2+xn)]=0 then mp^[WORD(256*y2+xn)]:=ncol(p2+p4,dxy,2);
mp^[WORD(word(256*yn)+xn)]:=ncol(word(p1+p2+p3+p4),word(dxy),4);
plasma(x1,y1,xn,yn); plasma(xn,y1,x2,yn);
plasma(x1,yn,xn,y2); plasma(xn,yn,x2,y2);
end;
procedure draw(xp,yp,dir:integer);
var z,zobs,ix,iy,iy1,iyp,ixp,x,y,s,csf,snf,mpc,i,j:integer;
begin
fillchar(rng,sizeof(rng),200); zobs:=100+mp^[WORD(256*yp+xp)];
csf:=round(256*cos((dir)/180*pi)); snf:=round(256*sin((dir)/180*pi));
fillchar(scr^,64000,0);
for iy:=yp to yp+55 do
begin
iy1:=1+2*(iy-yp); s:=4+300 div iy1;
for ix:=xp+yp-iy to xp-yp+iy do
begin
ixp:=xp+((ix-xp)*csf+(iy-yp)*snf) shr 8;
iyp:=yp+((iy-yp)*csf-(ix-xp)*snf) shr 8;
x:=160+360*(ix-xp) div iy1;
if (x>=0) and (x+s<=318) then
begin
z:=mp^[WORD(iyp shl 8+ixp)]; mpc:=z shr 1;
if z<47 then z:=46; y:=100+(zobs-z)*30 div iy1;
if (y<=199) and (y>=0) then
for j:=x to x+s do
begin
for i:=y to rng[j] do
scr^[WORD(320*i+j)]:=mpc;
if y<rng[WORD(j)] then rng[WORD(j)]:=y
end;
end;
end;
end;
{$IFDEF FPC}
DosMemPut($A000,0,Scr^,64000);
{$ELSE}
Move(Scr^,mem[$A000:0],64000);
{$ENDIF}
end;
VAR Reg : Registers;
begin
writeln('creating landscape...');
randomize; x:=0; y:=0; dir:=0; new(mp); fillchar(mp^,65535,0);
new(scr); mp^[$0000]:=128; plasma(0,0,256,256);
Reg.ax:=$13; Intr($10,Reg);
{$IFDEF FPC}
Outportb($3C8,0);
for i:=1 to 384 do OutPortb($3c9,pal[i]);
{$ELSE}
Port[$3C8] := 0;
for i:=1 to 384 do Port[$3c9] := pal[i];
{$ENDIF}
repeat
dir:=dir mod 360;
draw(x,y,dir);
case readkey of
#0:case readkey of
#75:dec(dir,10);
#77:inc(dir,10);
#72:begin
y:=y+round(5*cos((dir)/180*pi));
x:=x+round(5*sin((dir)/180*pi));
end;
#80:begin
y:=y-round(5*cos((dir)/180*pi));
x:=x-round(5*sin((dir)/180*pi));
end;
end;
#27: begin
Reg.ax:=$3;
Intr($10,Reg);
halt
end
end
until false;
end.
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