[Bug 4935] IHP Kitchen: Unhandled page fault on read access

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=4935





--- Comment #21 from Roderick Colenbrander <thunderbird2k at gmx.net>  2007-08-20 10:18:03 ---
I have debugged the program but the results aren't positive for now. At the
time we used totally different pixelformat code, there's not much left of it,
so I can't compare that with the current situation.

When you want to use OpenGL in your program you need to select a pixelformat
which describes the number of color bits, whether you want double buffering and
more.

The traditional way to select a pixelformat is by using ChoosePixelFormat. You
pass some specifications to it and it selects something. The problem is that
this function can return pixelformats which don't meet your specifications.
(Why this is a different story)

For this reason some programs implement their 'own' ChoosePixelFormat by
walking through all available pixelformats. This is what the IKEA program is
doing using DescribePixelFormat.

First of all it wants a single buffered pixelformat with GDI support
(PFD_DOUBLEBUFFER | PFD_SUPPORT_GDI). Right now we don't offer any single
buffering formats but this is fixable though tricky.

The most problematic thing it does is:
cColorBits = GetDeviceCaps(BITSPIXEL) | GetDeviceCaps(PLANES)

In case of GLX cColorBits corresponds to GLX_BUFFER_SIZE which is 32 while
BITSPIXEL is 24.. That's the main problem.

Wine's GetDeviceCaps should get fixed.


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