[Bf-committers] Layer system

[David Bryant]

I use bitfields in my patch but making bitfield arraysI'im unsure.Give a 
code example.I need to understand.
----- Original Message ----- 
From: "Martin Poirier" <theeth at yahoo.com>
To: "bf-blender developers" <bf-committers at blender.org>
Sent: Friday, December 21, 2007 5:23 PM
Subject: Re: [Bf-committers] Layer system


>
> --- David Bryant <aceone at bellsouth.net> wrote:
>
>> I need to know what time the meetings are held in
>> U.S. eastern time.
>
> 10 AM EST
>
>
>> To add my two cents right now, bit fields are not
>> the way to go.The old
>> system needs to be rebuilt.And even though it may
>> seem like an insignificant
>> recode, it's the future whether we acknowledge it or
>> not.Those that do 3D
>> for a living need more than 20 layers and named
>> layers at that.
>
> Named layers are not incompatible with using bitfields
> as layer status indicators.
>
> The advantages of bitfields (or an array of them) are
> quick visibility tests, quick insertion/removal,
> constant localized memory usage.
>
> Using linked list is definitely not a good option for
> the reasons that Brecht alluded to. Memory locality
> penalties, linear check time (assuming sorted lists),
> bigger memory footprint, ...
>
> Again, additional layer features (names and all that)
> don't have much to do with the actual back end used to
> indicate layers status. So those two discussions can
> run in parallel.
>
> Martin
>
>
> 
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