This has been completely broken since 2018 (commit a93283df), and no
one noticed, so it probably wasn't useful. Instead of fixing it, just
drop the feature and a bunch of odd nonportable code.
According to the C standard all preprocessor definitions starting
with an underscore are reserved for standard and implementation use,
so don't use those. Also, sort and unique include directives.
It's a deprecated platform that has weird OpenGL-related bugs and
is incompatible with using EGL anyway. It was clear we're going
to drop it, the only question was when. Answer: now.
The only thing we need it anymore is the package version and platform
configuration, so only include it for that. As a result, less files
are rebuilt when the git commit changes and config.h is regenerated.
Currently, icons, fonts, etc are converted to C structures at compile
time and are hardcoded to the binary. This presents several problems:
* Cross-compilation is complicated. Right now, it is necessary
to be able to run executables for the target platform; this
happens to work with wine-binfmt installed, but is rather ugly.
* Icons can only have one resolution. On OS X, modern software is
expected to take advantage of high-DPI ("Retina") screens and
use so-called @2x assets when ran in high-DPI mode.
* Localization is complicated. Win32 and OS X provide built-in
support for loading the resource appropriate for the user's
locale.
* Embedding strings can only be done as raw strings, using C++'s
R"(...)" literals. This precludes embedding sizable strings,
e.g. JavaScript libraries as used in Three.js export, and makes
git history less useful. Not embedding the libraries means we
have to rely on external CDNs, which requires an Internet
connection and adds a glaring point of failure.
* Linux distribution guidelines are violated. All architecture-
independent data, especially large data such as fonts, is
expected to be in /usr/share, not in the binary.
* Customization is impossible without recompilation. Minor
modifications like adding a few missing vector font characters
or adjusting localization require a complete development
environment, which is unreasonable to expect from users of
a mechanical CAD.
As such, this commit adds a resource system that bundles (and
sometimes builds) resources with the executable. Where they go is
platform-dependent:
* on Win32: into resources of the executable, which allows us to
keep distributing one file;
* on OS X: into the app bundle;
* on other *nix: into /usr/share/solvespace/ or ../res/ (relative
to the executable path), the latter allowing us to run freshly
built executables without installation.
It also subsides the platform-specific resources that are in src/.
The resource system is not yet used for anything; this will be added
in later commits.
config.h now includes the git hash and so, as long as it's included
in solvespace.h, any change of git HEAD will trigger a complete
recompilation, which makes bisecting especially annoying.
While we're at it, remove HAVE_STDINT_H from it, since we require
C++11 and all MSVC versions that include C++11 also include stdint.h.
In principle, GTK3 is the way forward, and GTK2 is officially
deprecated, though still maintained. In practice however, GTK3
is often unbearably buggy; e.g. on my system, combo boxes
don't ever roll up in GTK3 windows. So I have added support
for both.
This required a few minor changes to the core, namely:
* GTK wants to know beforehand whether a menu item is a check
menu item or a regular one.
* GTK doesn't give us an easy way to execute something after
any event is processed, so an explicit idle timer is added.
This is a no-op on Win32.
* A few function signatures were const'ed, since GTK expects
immutable strings when converting to Glib::ustring.
