[Rev 03] RFR: 8217472: Add attenuation for PointLight

[Kevin Rushforth]

On Sat, 14 Mar 2020 15:29:59 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

>> I did some limited testing today with a modification to the test program you attached to create a MeshView with 200
>> large quads (400 triangles) in a single node. This will eliminate the node overhead. I can confirm that it is fill rate
>> limited, because when I send the exact same amount of data, but make the triangles small, the frame rate goes up as
>> expected.  It sill looks like it isn't shader limited, though, at least on my Windows 10 machine, which has an Intel
>> UHD Graphics 630. More testing is needed on other platforms. I'll share the mods to the test program when I have time,
>> but it's basically just creating a set of quads on top of each other by reusing the same 4 points in each pair of faces.
>
> I'll attach the above modified testcase that I ran. I ran it on a relatively new Windows 10 laptop and a rather ancient
> MacBook Pro. I had to drastically reduce the number of quads on the Mac, but the results are similar: no significant
> difference between the current code and the proposed patch for point lights (without attenuation).  I'd like to see
> results on a recent machine with a graphics accelerator (either NVIDIA or AMD/ATI) to see if the new shader hurts
> performance there, but I suspect it will be fine.

Updated test case: [attenTest2.zip](https://github.com/openjdk/jfx/files/4332937/attenTest2.zip)

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PR: https://git.openjdk.java.net/jfx/pull/43