[PATCH] wined3d: Add a switch to preserve vertex buffer copy in system memory.

[Vincas Miliūnas]

CryENGINEs 2 and 3 have a feature of accessing system memory copy of
vertex buffer after it's been unlocked, this leads to crashes when
running under WINE [1]. This will also affect upcoming games like
MechWarrior Online, which are based on the same engine.

As suggested [2], it would be good to have a switch to force
preservation of vertex buffer copy in system memory [3].

The new registry key is named PreserveVertexBufferSysMemCopy and is
located in the Direct3D section.

[1] http://bugs.winehq.org/show_bug.cgi?id=18799
[2] http://bugs.winehq.org/show_bug.cgi?id=18799#c37
[3] http://bugs.winehq.org/show_bug.cgi?id=18040#c21

---
 dlls/wined3d/buffer.c          |    5 +++++
 dlls/wined3d/wined3d_main.c    |    7 +++++++
 dlls/wined3d/wined3d_private.h |    1 +
 3 files changed, 13 insertions(+), 0 deletions(-)


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