filament cannot use fp16, so we make the necessary changes for the
float version. Note that we are using mediump float, which ends up
using 16 bits floats anyways.
This provides 78% reduction in execution time (i.e. 4.6x performance
improvement). We see the EASU go from 4.2ms to 0.9ms.
The quality is slightly impacted.
Non sampleable buffers (Renderbuffers) are always rounded to 32 pixels
currently and on the backend side this buffer can end up being cached
as a sidecar buffer for MSAA. When it is created, it needs to be created
with the size of the texture it represents, not the size of the FBO,
which might be smaller.
In low-light conditions, peak luminance sensitivity of the eye shifts
toward the blue end of the visible spectrum. This effect called the
Purkinje effect occurs during the transition from photopic (cone-based)
vision to scotopic (rod-based) vision. Because the rods and cones use the
same neural pathways, a color shift is introduced as the rods take over to
improve low-light perception.
This function aims to (somewhat) replicate this color shift and peak
luminance sensitivity increase to more faithfully reproduce scenes in
low-light conditions as they would be perceived by a human observer
(as opposed to an artificial observer such as a camera sensor).
The night adaptation can be controlled using a 0..1 factor for artistic
reasons: `ColorGrading::Builder::nightAdaptation()`.
* Use wide gamut color grading and gamut mapping
This change introduces a new API on ColorGrading to enable or disable gamut mapping at will. This feature is currently off by default and while useful and recommended, it isn't cheap and we need to figure out what we want our defaults to be especially on mobile targets.
Gamut mapping can be combined with luminance scaling to properly control hue skews.
* Small cleanup
* More precise Rec.2020 conversion
- don't use a separate array for "reversedWindingOrder"
it's just one bit of data and we had 7 bits left in the Visibility structure.
- use Culler::result_type instead of hardcoded value everywhere
- other minor cleanups
The main changes are:
- shadowmap command generation is now done in the framegraph pass
itself, which allows it to be culled should the pass be culled.
- CameraInfo is created only once instead of twice / shadowmap.
It's not super heavy but also not cheap, as several matrices are
computed.
- simplified code.
src/details now only has the private headers of public types/classes.
Private/implementation classes have their header next to them under src.
This makes things more consistant.
