diff options
Diffstat (limited to 'src/gallium')
| -rw-r--r-- | src/gallium/state_trackers/nine/buffer9.c | 34 |
1 files changed, 30 insertions, 4 deletions
diff --git a/src/gallium/state_trackers/nine/buffer9.c b/src/gallium/state_trackers/nine/buffer9.c index 5e8d22e9fc4..387fc29878c 100644 --- a/src/gallium/state_trackers/nine/buffer9.c +++ b/src/gallium/state_trackers/nine/buffer9.c @@ -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) { } */ |