[Mesa-dev] [PATCH 1/3] vbo: implement uploading of current attribs

Eric Anholt eric at anholt.net
Mon Oct 29 14:55:13 PDT 2012

Marek Olšák <maraeo at gmail.com> writes:

> The driver chooses which attrib should be uploaded by calling
> vbo_get_current_attrib_buffer.
> The reason for this is we can track which current attribs are dirty and skip
> uploading accordingly. Before, we had to upload the attribs every draw call,
> which wasn't very effective.
> Stats for a whole run of the Nexuiz demo2 benchmark:
>   Without the following st/mesa patch:
>   - 21099 zero-stride vertices uploaded in u_vbuf.
>   With the st/mesa patch:
>   - 2474 zero-stride vertices uploaded in vbo.

How about actual performance stats?  It seems like this might help, but
I'm always dubious of +LOC without stats.

I think there are updates to Current.Attrib that were missed in the
flagging, grepping for that: _mesa_update_color_material() calls.

Also it seems like there must be something else that needs flagging, but
I can't find it.  Isn't copy_to_current about the transition from
per-vertex varying attributes to a uniform per draw call attribute, and
unused if you're only updating the current attribute in between
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