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author | Ben Skeggs <skeggsb@gmail.com> | 2008-03-13 13:39:05 +1100 |
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committer | Ben Skeggs <skeggsb@gmail.com> | 2008-03-13 13:39:05 +1100 |
commit | 03ec66375889f049b09f39ba98515aa35ac48164 (patch) | |
tree | e149d8defb52b1252af982b459902ee0800b17cd /src/gallium/include/pipe/p_winsys.h | |
parent | bd4fe0e87c1b979973d9a76aa48de5fbbb8d52b7 (diff) | |
parent | 2366bb1baf2e9ae5b6ecf19f66ae9e0a4b0d2f36 (diff) |
Merge remote branch 'upstream/gallium-0.1' into nouveau-gallium-0.1
Diffstat (limited to 'src/gallium/include/pipe/p_winsys.h')
-rw-r--r-- | src/gallium/include/pipe/p_winsys.h | 31 |
1 files changed, 27 insertions, 4 deletions
diff --git a/src/gallium/include/pipe/p_winsys.h b/src/gallium/include/pipe/p_winsys.h index e784c92491..1383bd0544 100644 --- a/src/gallium/include/pipe/p_winsys.h +++ b/src/gallium/include/pipe/p_winsys.h @@ -104,13 +104,36 @@ struct pipe_winsys * usage is a bitmask of PIPE_BUFFER_USAGE_PIXEL/VERTEX/INDEX/CONSTANT. This * usage argument is only an optimization hint, not a guarantee, therefore * proper behavior must be observed in all circumstances. + * + * alignment indicates the client's alignment requirements, eg for + * SSE instructions. */ struct pipe_buffer *(*buffer_create)( struct pipe_winsys *sws, - unsigned alignment, - unsigned usage, - unsigned size ); + unsigned alignment, + unsigned usage, + unsigned size ); - /** Create a buffer that wraps user-space data */ + /** + * Create a buffer that wraps user-space data. + * + * Effectively this schedules a delayed call to buffer_create + * followed by an upload of the data at *some point in the future*, + * or perhaps never. Basically the allocate/upload is delayed + * until the buffer is actually passed to hardware. + * + * The intention is to provide a quick way to turn regular data + * into a buffer, and secondly to avoid a copy operation if that + * data subsequently turns out to be only accessed by the CPU. + * + * Common example is OpenGL vertex buffers that are subsequently + * processed either by software TNL in the driver or by passing to + * hardware. + * + * XXX: What happens if the delayed call to buffer_create() fails? + * + * Note that ptr may be accessed at any time upto the time when the + * buffer is destroyed, so the data must not be freed before then. + */ struct pipe_buffer *(*user_buffer_create)(struct pipe_winsys *sws, void *ptr, unsigned bytes); |