Re: [AD] Shutting down Allegro due to signal #8

[Guillermo Martínez Jiménez <gmjimen@xxxxxxxxxx>]

Hello.  I have new clues and I think I've found the where's the
problem, but I don't know why it's happening and how fix it.

Testing the fixed-point trigonometry function (fixcos, fixsin, etc.) I
get a similar error message ("Shutting down Allegro due to signal
#11") so I think there's a problem with the trigonometry tables.  If I
create my own tables it works. But the tables I can create can't be
used by Allegro's functions to rotate bitmaps and sprites.

But all trigonometry tables are static (I mean, they're created at
compile-time not at run-time) and they aren't changed at run-time, are
they?

Here you have the Pascal code:
______________

PROGRAM test;
{$MODE FPC}

TYPE
  TBLptr = ^LONGINT;
VAR
{ This links with the _cos_tbl. Change the "liballeg-4..." by the DLL
on Winindows. }
  _cos_tbl: TBLptr; EXTERNAL 'liballeg-4.3.10.so';

{ My fixcos function. }

  function tabla(Base: TBLptr; Offset: Integer): LONGINT;
  begin
    inc(Base,Offset);
    tabla := Base^;
  end;

  FUNCTION al_fixcos (x: LONGINT): LONGINT;
  BEGIN
    al_fixcos := tabla (_cos_tbl, ((x + $4000) SHR 15) AND $1FF);
  END;

{ And here we go. }
VAR
  Num: LONGINT;
BEGIN
  Num := al_fixcos (0);
END.
________________________

It compiles and links but fails when it runs. Using Allegro 4.2 on
Windows that code worked (you can see it downloading Allegro.pas).

Anybody has an idea?