RFR: 8234921: Add DirectionalLight to the selection of 3D light types [v2]

[Nir Lisker]

On Sat, 18 Dec 2021 16:34:21 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

>> Btw, you don't need the "abs" for the gLightAttenuation check (you don't have it now when checking against 0.5) so you can just change it to `gLightAttenuation[i].w < EPSILON` which seems cleaner than testing against 0.5.
>
> I see you kept it as 0.5 and documented it. That's fine, too.

I just didn't want to mess with the math and need to retest everything just for this. If I add the EPSILON checks for falloff later I will use it there too.

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PR: https://git.openjdk.java.net/jfx/pull/548