I literally thought of building this kind of thing recently, although I have some differing ideas on how to implement it. But the general idea of a single header C-like file that compiles to wasm and outputs primitive drawing commands is exactly what I was thinking.
What I really want is something like the old Flash/ActionScript display list. Just a 2d scene graph with the option to output draw commands, text or sprites. Things like containers (with things like border/backgrounds/etc.) and layouts can be built on top of that, so you could have two separate header files, one for the display list and another for a layout library.
What I really want is something like the old Flash/ActionScript display list. Just a 2d scene graph with the option to output draw commands, text or sprites. Things like containers (with things like border/backgrounds/etc.) and layouts can be built on top of that, so you could have two separate header files, one for the display list and another for a layout library.