Im not sure why its giving me this error, as its pointing right at the plus signs

G3DPrimatives.pas(34,43) Error: Incompatible types: got "Extended"
expected "SmallInt"
G3DPrimatives.pas(36,43) Error: Incompatible types: got "Extended"
expected "SmallInt"
      2 : Index := Y * Surface^.pitch / 2 + X;
                                                       ^
23  procedure DrawPixel(var Surface : PSDL_Surface; X, Y, R, G, B : integer);
24  var
25    Color : longword;
26    Pixel : ^longword;
27    Index : integer;
28  begin
29    New(Pixel);
30    case Surface^.format^.BytesPerPixel of
31      {8bpp}
32      1 : Index := Y * Surface^.pitch + X;
33      {16bpp}
34      2 : Index := Y * Surface^.pitch / 2 + X;
35      {32bpp}
36      4 : Index := Y * Surface^.pitch / 4 + X;
37    else
38      WriteLn('Unsupported byte per pixel');
39    end;
40    Pixel := Surface^.pixels + Index;
41    Color := SDL_MapRGB(Surface^.format, R, G, B);
42    Pixel^:= Color;
43  end;

because the '/' operator does not return an integer. Use div if you want an integer result.

Cheers,
David.

integer);