Avoid iterating over unused samplers.

Avoid iterating over unused samplers.

Keep track of the maximum used sampler to avoid expensive iterations in applyTextures and validateSamplers.

BUG=
TEST=webgl conformance tests

Committed: http://code.google.com/p/angleproject/source/detail?r=795

[nicolas, 2011-10-17 15:13:04]

Looks generally ok but it's slightly confusing that getMaxUsedSampler actually
returns the maximum used sampler index plus one. This can be avoided by renaming
it to getUsedSamplerCount. Same thing for the actual member variables.

[nicolas, 2011-10-17 16:23:47]

Actually getUsedSamplerCount wouldn't be right either. getUsedSamplerRange
perhaps?

[John Bauman, 2011-10-17 21:32:00]

On 2011/10/17 16:23:47, nicolas wrote:
> Actually getUsedSamplerCount wouldn't be right either. getUsedSamplerRange
> perhaps?

Yeah, I tried to think of a better name, but eventually gave up.
getUsedSamplerRange might work, though.

[John Bauman, 2011-10-17 23:59:40]

On 2011/10/17 21:32:00, John Bauman wrote:
> On 2011/10/17 16:23:47, nicolas wrote:
> > Actually getUsedSamplerCount wouldn't be right either. getUsedSamplerRange
> > perhaps?
> 
> Yeah, I tried to think of a better name, but eventually gave up.
> getUsedSamplerRange might work, though.

Ok, changed the name.

[nicolas, 2011-10-18 17:19:19]

Looks good to me.