[Bug 38264] Chessmaster 10 & 11 crash on startup (regression)

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=38264

Matteo Bruni <matteo.mystral at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever confirmed|0                           |1

--- Comment #4 from Matteo Bruni <matteo.mystral at gmail.com> ---
Thanks for the trace, it was definitely helpful.

It's probably wined3d crashing in state_cb() when trying to call
glBindBufferBase. Since the regression patch we're returning NULL pointers to
GL functions which are not supported by the GL implementation, given the GL
version and the extensions advertised, as specified by the XML API registry
from Khronos. In your case GL_ARB_uniform_buffer_object is supported but the GL
version exposed is 2.1 and the XML file requires version 3.0 for
glBindBufferBase, so we return NULL and crash when going to use the function
later on.

As far as I can see GL_ARB_uniform_buffer_object specifies BindBufferBase
without any version requirements, so I think it's an issue in the XML file. I'm
not sure how one would report such an issue to Khronos.

When Khronos fixes its XML we can update our code and finally fix the issue for
you. For the time being you can either revert the regression patch you
identified or comment out the GL_ARB_uniform_buffer_object entry in the
gl_extension_map[] table in wined3d/directx.c.

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