Re: [Public WebGL] webgl texture format conversions: doable in 17k of executable code (x86-64) !

[Kenneth Russell <kbr@google.com>]

Nice work! Thanks for contributing this to the community. I'm looking
at integrating your new code back into WebKit now.

-Ken


On Tue, May 8, 2012 at 7:05 AM, Benoit Jacob <bjacob@mozilla.com> wrote:
>
> Hi,
>
> This email is 50% bragging rights and 50% sharing hopefully useful info with other browser vendors.
>
> You know that a WebGL implementation has to handle a large number of cases of texture format conversions: there are many source formats, many destination formats, and the possibility of premultiplication or unpremultiplication.
>
> Here is a changeset (currently only on mozilla-inbound) that brings this code size down to 17k on x86-64 (as measured with nm -S on linux). Our previous version, which was already quite careful, was 44k. This is using the 'fully templatized' approach i.e. a separate conversion loop is compiled for each case, traversing the bitmaps only once, with all the texel conversion functions inlined into it.
>
> Changeset:
> https://hg.mozilla.org/integration/mozilla-inbound/rev/9f87dbd4d39c
>
> The key was to avoid compiling paths that are never called, the code for this is there:
> https://hg.mozilla.org/integration/mozilla-inbound/rev/9f87dbd4d39c#l4.82
>
> Cheers,
> Benoit
>
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