While the reason for doing this is to allow draws referencing mapped buffer
resources to succeed, the behaviour of the application in the referenced bug
report (FlatOut) appears to be slightly different; it does end up drawing
while buffer objects are mapped due to reordering of map operations inside the
command stream, but as far as I can tell those buffer objects are not
referenced by the draw. The driver in question (fglrx/Catalyst) appears to
simply be a bit overzealous with throwing errors, and unfortunately doesn't
provide much more information than "glDrawElementsBaseVertex has generated an
error (GL_INVALID_OPERATION)". The issue is not reproducible with Mesa
radeonsi.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=46118Signed-off-by: Henri Verbeet <hverbeet@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>