[Bug 38875] DirectDraw: blitting from Offscreen Plain surface to Primary Surface displays black instead

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=38875

--- Comment #8 from Lauri Kenttä <lauri.kentta at gmail.com> ---
Created attachment 56452
  --> https://bugs.winehq.org/attachment.cgi?id=56452
Sample program

Here's a stripped-down version of the test program. In this one, you press
numbers 1-6 to select different rendering functions. Look at the source and
stdout for more information. There are a lot of asserts to catch any failures.

This program shows that blitting from DDSCAPS_OFFSCREENPLAIN to the primary
surface works fine. This bug report is either fixed, incomplete or invalid.

There are other problems, not related to the title of this bug report:

If a ddraw test is run first, SetPixelFormat in InitOpenGL fails, so it's not a
surprise that it won't render anything. Setting depth buffer and stencil buffer
to 0 bits (as they are not needed) fixes this problem, though. I suppose this
is a known problem of the current ddraw implementation.

If OpenGL is initialized first, ddraw doesn't draw anything, but I don't see
any of the functions actually failing in that case.

Switching ddraw->OpenGL->ddraw crashes Wine with this error:
err:d3d:context_check_fbo_status FBO 0 is incomplete, driver bug?
wine: Unhandled page fault on read access to 0x00000000 ...

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