[Bug 40569] TOCA Touring Car Championship crashes

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=40569

Michael Müller <michael at fds-team.de> changed:

           What    |Removed                     |Added
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                 CC|                            |michael at fds-team.de

--- Comment #1 from Michael Müller <michael at fds-team.de> ---
Created attachment 54476
  --> https://bugs.winehq.org/attachment.cgi?id=54476
Hack to make game start (requires staging patch)

The backtrace is a bit misleading. The application fails to create a direct3d
device and doesn't check for errors. The null pointer is then passed to
d3d_material3_GetHandle resulting in the crash.

The creation of the device fails for two reasons. The application tries to
create a render target in system memory which is only supported for the rgb
emulation device / reference renderer on windows and not at all in Wine.
Secondly the game tries to use a 8 bit surface as render target.

For the first problem (see bug 34906), Wine Staging contains a patch to work
around this problem:
https://github.com/wine-compholio/wine-staging/blob/master/patches/ddraw-Rendering_Targets/0001-ddraw-Create-rendering-targets-in-video-memory-if-po.patch
The patch is not completely sufficient in this case as the game does not
explicitly request a RGB device. I am not completely sure why this should work
on windows, but there are different possible explanations (game expects a
different ordering for ddraw devices, expects different d3d caps, ...). Anyway,
I attached a hack which alters the patch to always allow creating render
targets in system memory.

The second problem affects several older games as they expect that 8 bit
surfaces can be used as render target. If I remember correctly, this is not
possible with modern graphic cards and Wine therefore does not support it. You
can easily add the necessary flags in the format array of Wine (see attached
hack), but this will lead to some other issues as Wine does not properly handle
color palettes for render targets. I have patches to fix some of them, but as
long as Wine does not intend having support for P8 render targets at all, it
does not make much sense to continue working on them.

The staging patch plus the attached hack are enough to make the game start and
use the main menu.

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