[Bug 39421] Majesty Gold HD runs very slowly

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=39421

--- Comment #7 from Jonas Maebe <jonas.bugzilla at gmail.com> ---
(In reply to Stefan Dösinger from comment #6)
> I don't see how we can do partial flushes. glFlush doesn't take any
> arguments.

I guess it would boil down to implementing double buffering ourselves: always
keep a copy of the previous image in VRAM, and then composite that one (on the
card) with textures created from the the new partial blits (which come from
system memory and which only cover part of the screen).

There should be no need for transfers from VRAM back to system memory in this
scenario, nor for any dirty rects testing by Wine, as the blits tell you
exactly where the dirty rects are. Unless, of course, you have to take into
account that the frontbuffer may also be modified by other means than ddraw
blits. However, since forcing the game to always use ddraw blits resolves the
speed issue on Windows, I guess this can somehow be detected/known.

> One idea that has been floating around since a long time is to have a thread
> in wined3d that draws the front buffer to the screen every 1/60th second,
> and otherwise we don't do anything special about front buffer modifications.
> I guess this would fix this game here, but it isn't really trivial to
> implement.

I can imagine.

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