{$X+} {$R-}
Uses Crt;

CONST VGA = $a000;
      XSize = 16;
      YSize = 16;

TYPE
        Letter = Array[1..xsize,1..ysize] of Byte;
        Letters = Array[' '..']'] of Letter;

VAR Font : ^Letters;

{ִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִ}
Procedure SetMCGA;  { This procedure gets you into 320x200x256 mode. }
BEGIN
  asm
     mov        ax,0013h
     int        10h
  end;
END;


{ִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִ}
Procedure SetText;  { This procedure returns you to text mode.  }
BEGIN
  asm
     mov        ax,0003h
     int        10h
  end;
END;

{ִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִ}
procedure WaitRetrace; assembler;
  { This waits until you are in a Verticle Retrace }

label
  l1, l2;
asm
    mov dx,3DAh
l1:
    in al,dx
    and al,08h
    jnz l1
l2:
    in al,dx
    and al,08h
    jz  l2
end;

{ִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִ}
Procedure Pal(ColorNo : Byte; R,G,B : Byte);
  { This sets the Red, Green and Blue values of a certain color }
Begin
   Port[$3c8] := ColorNo;
   Port[$3c9] := R;
   Port[$3c9] := G;
   Port[$3c9] := B;
End;


{ִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִ}
Procedure PutPixel (X,Y : Integer; Col : Byte; Where : Word);
   { This puts a pixel at X,Y using color col, on VGA or the Virtual Screen}
BEGIN
  Mem [Where:X+(Y*320)]:=col;
END;

{ִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִ}
procedure LoadPal (FileName : string);
   { This loads the Pallette file and puts it on screen }
type DACType = array [0..255] of record
                                R, G, B : byte;
                              end;
var DAC : DACType;
    Fil : file of DACType;
    I : integer;
BEGIN
  assign (Fil, FileName);
  reset (Fil);
  read (Fil, DAC);
  close (Fil);
  for I := 0 to 255 do Pal(I,Dac[I].R,Dac[I].G,Dac[I].B);
end;

{ִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִ}
function Exist(FileName: string): Boolean;
    { Checks to see if filename exits or not }
var f: file;
begin
  {$I-}
  Assign(f, FileName);
  Reset(f);
  Close(f);
  {$I+}
  Exist := (IOResult = 0) and
   (FileName <> '');
end;


{ִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִ}
Procedure Setup;
  { This loads the font and the pallette }
VAR f:file;
    loop1:char;
    loop2,loop3:integer;
BEGIN
  getmem (font,sizeof (font^));
  If exist ('softrock.fnt') then BEGIN
    Assign (f,'softrock.fnt');
    reset (f,1);
    blockread (f,font^,sizeof (font^));
    close (f);
    Writeln ('SoftRock.FNT from TEXTER5 found in current directory. Using.');
  END
  ELSE BEGIN
    Writeln ('SoftRock.FNT from TEXTER5 not found in current directory.');
    For loop1:=' ' to ']' do
      For loop2:=1 to 16 do
        for loop3:=1 to 16 do
          font^[loop1,loop2,loop3]:=loop2;
  END;
  If exist ('pallette.col') then
    Writeln ('Pallette.COL from TEXTER5 found in current directory. Using.')
  ELSE
    Writeln ('Pallette.COL from TEXTER5 not found in current directory.');
  Writeln;
  Writeln;
  Write ('Hit any key to continue ...');
  readkey;
  setmcga;
  If exist ('pallette.col') then loadpal ('pallette.col');
END;


{ִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִִ}
Procedure ScrollMsg (Msg : String);
  { This scrolls the string in MSG across the screen }
Var Loop1,loop2,loop3 : Integer;
Begin
  For loop1:=1 to length (msg) do BEGIN
    For loop2:=1 to xsize do BEGIN

      { This bit scrolls the screen by one then puts in the new row of
        letters }

      waitretrace;
      For Loop3 := 100 to 99+ysize do
        move (mem[vga:1+(loop3*320)],mem[vga:(loop3*320)],319);
      for loop3:=100 to 99+ysize do
        putpixel (319,loop3,font^[msg[loop1],loop2,loop3-99],vga);
           { Change the -99 above to the minimum of loop3-1, which you
             will change in order to move the position of the scrolly }
    END;

    {This next bit scrolls by one pixel after each letter so that there
      are gaps between the letters }

    waitretrace;
    For Loop3 := 100 to 99+ysize do
      move (mem[vga:1+(loop3*320)],mem[vga:(loop3*320)],319);
      for loop3:=100 to 99+ysize do
        putpixel (319,loop3,0,vga);
  END;
End;


BEGIN
  ClrScr;
  Writeln ('This program will give you an example of a scrolly. If the file');
  Writeln ('SOFTROCK.FNT is in the current directory, this program will scroll');
  Writeln ('letters, otherwise it will only scroll bars. It also searches for');
  Writeln ('PALLETTE.COL, which it uses for it''s pallette. Both SOFTROCK.FNT');
  Writeln ('and PALLETTE.COL come with TEXTER5.ZIP, at a BBS near you.');
  Writeln;
  Writeln ('You will note that you can change what the scrolly says merely by');
  Writeln ('changing the string in the program.');
  Writeln;
  Setup;
  repeat
    ScrollMsg ('ASPHYXIA RULZ!!!   ');
  until keypressed;
  Settext;
  freemem (font, sizeof (font^));
  Writeln ('All done. This concludes the fifth sample program in the ASPHYXIA');
  Writeln ('Training series. You may reach DENTHOR under the name of GRANT');
  Writeln ('SMITH on the MailBox BBS, or leave a message to ASPHYXIA on the');
  Writeln ('ASPHYXIA BBS. Get the numbers from Roblist, or write to :');
  Writeln ('             Grant Smith');
  Writeln ('             P.O. Box 270');
  Writeln ('             Kloof');
  Writeln ('             3640');
  Writeln ('I hope to hear from you soon!');
  Writeln; Writeln;
  Write   ('Hit any key to exit ...');
  Readkey;
END.