Re: [Algorithms] Texture mip streaming prioritization

[Krzysztof N. <k.n...@gm...>]

Hi,

A good solution would be just to precompute some data. For example camera
is at point X - what should I load. Alternatively - object X is Y meters
from camera - what should I load. Without precomputation it's hard to know
what will be needed in nearest time. Current frame usually doesn't contain
enough information.

BTW isn't loading single mip-maps too fine grained, at least from seek time
perspective? Most popular solutions are based on two states - ~64x64 thumb
/ full texture.

-- 
Krzysztof Narkowicz


On Mon, Jul 22, 2013 at 9:16 AM, Josh Green <in...@gm...> wrote:

> Hi There,
>
> I'm currently working on a texture streaming system and looking into ways
> to prioritize which mips on which textures should be loaded.
> I was hoping that people on this list may have experience with these
> algorithms that they could share?
>
> Currently I know which mips need to be loaded in order to render a scene
> without degradation in image quality.
> I would now like to apply a memory budget to textures, and make decisions
> about which mips of which textures should be loaded over others.
>
> My current line of thinking involves comparing cost / benefit of loading
> each individual mip.
> i.e.
>
> How many pixels would be affected by a particular mip level being loaded
> versus how much memory would that mip level use?
>
> This becomes Priority = Benefit / Cost
>
> I'd then sort for highest priority and assign memory budget to those mips
> at the top of the list.
>
> Any thoughts? comments? Alternatives that work better? Alternatives that
> have worked enough?
>
> Problems that arise with the above algorithm are quite broad, and in
> particular, optimising the tipping point between cost and benifit would be
> necessary. Also, calculating the number of pixels affected would involve
> crude calculations that aren't really going to affect real world values....
>
> Thanks all for your thoughts!
>
> Josh
>
>
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