* slice: fix memory semantics
* slice: prefer passing slice by value
This lets us do nice things like coercing Slice<T> to Slice<const T>, etc.
* slice: fix unit tests
* slice: fix copy/assignment, hash function
Don't attempt to define a copy constructor/assignment operator which would
convert a constant type to a mutable type.
Additionally, fix the hash function such that we're hashing U instead of const
U.
libmath itself doesn't expose any stream operators anymore. However,
libutils is able to automatically print libmath types into its
io::ostream -- however matrices are not formatted nicely.
Added a new optional library, libmathio, that provides std::ostream
operators for all libmath types. libmathio does a better job at
formating matrices.
Also removed apply() and map() from libmath because there were not used
anywhere and they forced us to depend on <functional> in public headers.
When processing very high dynamic range environments, the importance
sampling code falls appart, it becomes a user choice to decide if
prefilter importance sampling is better or worse than just regular
importance sampling -- both are usually bad.
--ibl-no-prefilter gives the user this choice.
Clamping is now disabled by default in cmgen, there is a new option
to enable it "--clamp".
Automatic SH windowing is also enabled by default and can be controled
with the "--sh-window" option. Accepted parameters are "no" to disable
windowing, "auto" for automatic windowing or a number to specify the
cutoff band.
auto windowing only works for 1, 2, and 3 bands.
--sh-window=band, -w band : this low-pass-filters the environment
such that bands above 'band' are zero. This can be used to reduce ringing
when the source environment has high frequencies
--noclamp : turns off clamping before processing the cube map
This is still work in progress.
The conversion factors from radiance to irradiance where wrong.
The bug above was found while refactoring the code to be clearer. Now
the method that computes the coefficients for the shader calls the
regular SH code and applies all the appropriate factors on that.
With this change the options "--sh-shader" and "-sh=3 -i" won't
produce the same result because --sh-shader includes the lambertian
diffuse. "--sh" now always produces actual SH coefficients.
We now never process mirroring or mipmaping with multithreading
it's just not worth it given the overhead of the jobsystem.
We also require 64 lines per job, below that, we only multithread per
face (6 threads). This should probably depends on the sample count,
but we don't have this facility yet.
Special case downsampling for mipmaping.
This alone improves performance by 2x for small cubemaps (e.g. 16x16).
This adds a utility function on IndirectLight populate the reflection
map from an environment at runtime. This performs some processing
similar to cmgen, albeit at a reduced quality.
