The finalizer can't be used to dispose of filament resource, because
it runs on its own thread.
Added a destroy() method to all IBLPrefilter related classes that must
be called once the object is no longer needed.
note: Resources will be freed eventually anyways when the Engine itself is
destroyed.
fixes#4633
- move kernel weight computation to the gpu side as a small cost, in
order to simplify the CPU side and reduce the binary size.
- skip samples with a weight of 0, which is a completely coherent
check.
- fix a typo in move ctor
- move public headers from filament/foo to filament-foo/
to avoid confusion with libfilament's headers
- add support for equirectangular to cubemap conversion
- add support for using an .hdr file directly in all our samples
- the miplevel wasn't computed correctly
- the random rotation was incorrect
- the default HDR compression was too aggressive
- better validation of the input cubemap
we now store the kernel for each lod in a texture, this has several
advantages:
- the texture can be reused, so we can amortize that cost a bit
- we could generate the texture with a shader, so that we don't
have to do any texture uplaod (TBD).
