Using the commands property we can just paste SVG paths. This makes it
much easier to write examples/demos. A good online path designer is
for example https://codepen.io/anthonydugois/pen/mewdyZ
Making color a real property type broke the build of tests that compare
color properties. Fix this and the incorrect decoding of
strings in the cast to colors, by providing a proper public C++ color
wrapper type.
The Image's source property used to be a string. Now it is a Resource
enum, which can either be None or an absolute file path to the image on
disk. This also replaces the internal Image type.
The compiler internally resolves the img bang expression to a resource
reference, which shall remain just an absolute path. For now the target
generator passes that through, but in the future the target generator
may choose a target specific way of embedding the data and thus
generating a different Resource type in the final code (through
compile_expression in the cpp and rust generator).
The C++ binding is a bit messy as cbindgen doesn't really support
exporting enums that can be constructed on the C++ side. So instead we
use cbindgen to merely export the type internally and only use the tag
from it then. The public API is then a custom Resource type that is
meant to be binary compatible.
The objective is to automatically create a propery cmake module, with a
FindSixtyFPSConfig.cmake, corresponding targets .cmake files, etc. This
should encapsulate the build profile (debug vs. release) and also allow
making the choice of shared vs. static transparent.
Unfortunately it does not seem to be possible to easily combine different
crates into one cdylib crate that can re-export symbols from the
statically linked rust crates (cbindgen generated, as well as manual
extern "C").
That means for the dynamic case (not cared for right now), we're going
to need to create either one cdylib per crate that has public symbols or
manually re-export the symbols.
For the static case, linking just against the "last crate" in the chain
(the gl renderer backend) is sufficient to pull in all needed symbols.
In addition for the static case we need to specify the linkage of some
external libraries. This can be extracted manually via
cargo rustc -p gl -- --print=native-static-libs
for example. For now that's in the changed CMakeLists.txt, but the plan
going forward is to automate this extraction in an xtask, to paste that
into the cmake target.
Finally, both linkage scenarios require access to the headers. This is
for now solved by generating them simply in an include sub-directory of
the build folder ($root/target/${profile}/include).
