Re: [Public WebGL] Spec change request.

[Chris Marrin <cmarrin@apple.com>]

On Dec 4, 2010, at 7:34 PM, Steve Baker wrote:

> When I benchmark my rendering code - I find that an unreasonable
> percentage of the time is spent doing this:
> 
>    if ( someUniformLocation != null )                               
> <==== THIS!
>      gl.uniformXXX ( someUniformLocation, XXX ) ;
> 
> ...in situations where a uniform variable might not exist in the shader
> in some rendering passes but does exist in others (eg, when the shadow
> and depth rendering passes don't need to see textures and such).
> 
> Losing the 'if' test would speed things up significantly.
> 
> It would be a performance win if all of the various uniform setter
> functions would legally accept a 'null' location (and do nothing)
> without flagging an error in that circumstance.   An 'if' in C++ (which
> you're probably doing anyway in order to do error detection) is much
> faster than doing one in JavaScript - and I don't see any downsides.
> 
> Any chance of a spec change?

What happens today if you get rid of the if? Coredump? Failed rendering? Nothing bad?

-----
~Chris
cmarrin@apple.com




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