[PATCH 1/4] ddraw: Make D3DVBCAPS_WRITEONLY vertex buffers dynamic

[Stefan Dösinger]

Am Dienstag, 28. Februar 2012, 13:05:16 schrieb Henri Verbeet:
> I don't see why WRITEONLY should imply DYNAMIC.
For one, the documents from nvidia tell you to set D3DVBCAPS_WRITEONLY when 
you want to stream data[1]. Microsoft doesn't really document how dynamic 
buffers work in d3d7.

The other consideration is that DYNAMIC buffers that are not WRITEONLY are a 
bad idea in d3d8/9. Yes, we don't handle WINED3DUSAGE_WRITEONLY at the moment, 
but the consideration makes sense for d3d7 too.

> Setting it for all
> ddraw buffers may make sense, but even then I'd like to hear a
> somewhat more convincing argument that now is the right time to change
> this.
To fix bug 30019. That's the one argument I have. I'm happy to defer this 
change until after Wine 1.4.

It's fairly obvious that we have to set DYNAMIC somewhere if we want 
DDLOCK_DISCARDCONTENTS and DDLOCK_NOOVERWRITE to work, but I think that's not 
your point of concern.

1: http://developer.download.nvidia.com/assets/gamedev/docs/top5perfkill.pdf
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