Am Freitag, den 27.06.2008, 11:26 +0200 schrieb slawek:
I have one game, that needs DX6, but lowest clone version of DX is 7.
That statement is wrong. dlls/ddraw implements DirectDraw 1 to 7. Core functionality for surfaces and DX7 special functions are in surface.c, whereas DX1-5 surfaces are implemented in surface_thunks.c.
The problem you identified is nevertheless real. DirectDraw6 comes with IDirectDrawSurface4, which is currently (as the vtable layout is compatible) implemented via IDirectDrawSurface7 (there is no IDirectDrawSurface{5,6}), so the DX6 version of surface directly uses the DX7 code, and does not use the relaxed thunk from IDirectDrawSurface3 (which is also used for IDirectDrawSurface and IDirectDrawSurface2).
If I get it right, the correct fix is to add a thunk vtable for IDirectDraw4 that uses relaxed parameter checks on AddAttachedSurface.
Regards, Michael Karcher