[Mesa-dev] Path to optimize (moving from create/bind/delete paradgim to set only ?)

[Jerome Glisse]

On Tue, Nov 16, 2010 at 3:51 PM, Jakob Bornecrantz <wallbraker at gmail.com> wrote:
> On Tue, Nov 16, 2010 at 7:21 PM, Jerome Glisse <j.glisse at gmail.com> wrote:
>> Hi,
>>
>> So i looked a bit more at what path we should try to optimize in the
>> mesa/gallium/pipe infrastructure. Here are some number gathers from
>> games :
>> drawcall /     ps constant   vs constant     ps sampler    vs sampler
>> doom3            1.45             1.39               9.24              9.86
>> nexuiz             6.27             5.98               6.84              7.30
>> openarena  2805.64             1.38               1.51              1.54
>>
>> (value of 1 mean there is a call of this function for every draw call,
>> while value of 10 means there is a call to this function every 10 draw
>> call, average)
>>
>> Note that openarena ps constant number is understable as it's fixed GL
>> pipeline which is in use here and the pixel shader constant doesn't
>> need much change in those case.
>>
>> So i think clear trend is that there is a lot of constant upload and
>> sampler changing (allmost at each draw call for some games)
>
> Can you look into what actually changes between the sampler states?
> Also that vs sampler state change number for OpenArena looks a bit
> fishy to me.
>
> Cheers Jakob.
>

I haven't looked at what change yet, i assume something small, i think
bugle trace of the engine is maybe easier to use than looking at
quake3 source code. For the vs sampler i was surprised too but it's
just the fact that q3 changes the vertex buffer a lot and this trigger
the vs sampler.

Cheers,
Jerome