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st/nine: Improve buffer placement 

Signed-off-by: Axel Davy <axel.davy@ens.fr>
This commit is contained in:
Axel Davy 2016-03-11 23:03:56 +01:00
parent 7639033973
commit 6ef231c80f
1 changed files with 30 additions and 4 deletions
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34
src/gallium/state_trackers/nine/buffer9.c
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@ -69,11 +69,37 @@ NineBuffer9_ctor( struct NineBuffer9 *This,
* can still be read (but slower). */
info->bind = PIPE_BIND_VERTEX_BUFFER | PIPE_BIND_TRANSFER_WRITE | PIPE_BIND_TRANSFER_READ;
info->usage = PIPE_USAGE_DEFAULT;
if (Usage & D3DUSAGE_DYNAMIC)
info->usage = PIPE_USAGE_STREAM;
else if (Pool == D3DPOOL_SYSTEMMEM)
/* It is hard to find clear information on where to place the buffer in
* memory depending on the flag.
* MSDN: resources are static, except for those with DYNAMIC, thus why you
* can only use DISCARD on them.
* ATI doc: The driver has the liberty it wants for having things static
* or not.
* MANAGED: Ram + uploads to Vram copy at unlock (msdn and nvidia doc say
* at first draw call using the buffer)
* DEFAULT + Usage = 0 => System memory backing for easy read access
* (That doc is very unclear on the details, like whether some copies to
* vram copy are involved or not).
* DEFAULT + WRITEONLY => Vram
* DEFAULT + WRITEONLY + DYNAMIC => Either Vram buffer or GTT_WC, depending on what the driver wants.
*/
if (Pool == D3DPOOL_SYSTEMMEM)
info->usage = PIPE_USAGE_STAGING;
else if (Pool == D3DPOOL_MANAGED)
info->usage = PIPE_USAGE_DEFAULT;
else if (Usage & D3DUSAGE_DYNAMIC && Usage & D3DUSAGE_WRITEONLY)
info->usage = PIPE_USAGE_STREAM;
else if (Usage & D3DUSAGE_WRITEONLY)
info->usage = PIPE_USAGE_DEFAULT;
/* For the remaining two, PIPE_USAGE_STAGING would probably be
* a good fit according to the doc. However it seems rather a mistake
* from apps to use these (mistakes that do really happen). Try
* to put the flags that are the best compromise between the real
* behaviour and what buggy apps should get for better performance. */
else if (Usage & D3DUSAGE_DYNAMIC)
info->usage = PIPE_USAGE_STREAM;
else
info->usage = PIPE_USAGE_DYNAMIC;
/* if (pDesc->Usage & D3DUSAGE_DONOTCLIP) { } */
/* if (pDesc->Usage & D3DUSAGE_NONSECURE) { } */