Enhancements

Engine

Introduced RenderTarget API that allows View to reference an offscreen render target.
Added lucy_bloom sample to demonstrate the new RenderTarget API.
Added Screen Space Ambient Occlusion support (SAO)
New blending modes: multiply and screen
Fixed an issue when sorting blended objects with different blending modes
The material property curvatureToRoughness has been replaced with specularAntiAliasing.
This new specular anti-aliasing solution offers more control via two new properties:
specularAntiAliasingVariance and specularAntiAliasingThreshold. They can also be set on
material instances if needed
Added specular ambient occlusion to compute a new AO term applied to specular reflections
(see specularAmbientOcclusion property in materials)
Added multi-bounce ambient occlusion to brighten AO and preserve local color
(see multiBounceAmbientOcclusion property in materials)
Micro-shadowing is now applied to material ambient occlusion
Use a smaller 64x64 DFG LUT on mobile to reduce binary size
JavaScript MaterialInstance now supports vec4 colors.
Implemented hard fences for the Metal backend, enabling dynamic resolution support.
Created a RELEASE_NOTES.md file, to be updated with significant PRs.

Improved robustness in the tangents utility for meshes that have tangents and normals.
Added a distance field generator to libimage.
Further reduced filamat binary size by removing reliance on stdlib.
Added a new, smaller, version of the filamat library, filamat_lite. Material optimization and
compiling for non-OpenGL backends have been removed in favor of a smaller binary size.
Improved SurfaceOrientation robustness when using UVs to generate tangents.