Calling functions directly on Object will result in non-virtual calls,
calling functions on AbstractObject will result in virtual calls. Also
removed now unneeded "hacks" like `sceneObject()` and properly hiding
unsafe functions taking `AbstractObject*` with safe functions taking
`Object*`. Also hide `isScene()` from public documentation, as it is
sort-of hack too.
It prevents unwanted implicit conversions from e.g. nullptr to Camera,
Vector2 to Physics::Point etc. By making all the constructors explicit
it is easier to routinely add the keyword to all new classes instead of
thinking about cases when to add and when not to.
Currently the documentation looked like "who would ever want something
else than 2D/3D objects", now it hints that the objects can be also on
steroids, err.., doubles instead of floats.
Using header with forward declarations, containing declarations for all
classes with default parameters. The classes themselves don't have the
defaults.
This also allows users to more conveniently forward-declare instead of
digging in sources and writing the declarations on their own.
The downside of this is that the functions are now virtual, which makes
them slower than before. Maybe final qualifier would help?
AbstractObject::sceneObject() is marked as private in Object to avoid
confusion.
Functionality present in Object is now split into three main components:
* Object itself, handling parent/children relationships
* Transformation implementation and interfaces for common functionality
* Object features, providing transformation caching and base for
cameras, collision shapes, rigid bodies etc.
Some functionality depending on former implementation is temporarily
disabled and will be reworked later.
Extern template probably causes even inline functions to be
instantiated, because MinGW's GCC 4.7.0 then complains about conflicting
symbols, removing them fixes the issue.
Extern template is not necessary here, as the needed functions are
explicitly instantiated in source file only anyway and we don't care
about instantiation count of inline functions.
Magnum.h now doesn't include anything except OpenGL headers, thus
changes in Math library don't trigger recompilation of everything, but
only of things really depending on it.
Math constants moved to separate file for similar reasons, de-inlined
some functions to remove the need for some #includes.
Resulting (debug) executables are ~100 kB smaller, all operations
which were previously logarithmic are now done in constant time and
the whole implementation is a lot simpler.
Previously the scene was its own parent, which was good sometimes back
then, but it became so ugly and complicated hack ("my friend has access
to my privates"-style) that it needed to be replaced with something less
ugly.
Now there is an function isScene() which is overloaded in Scene. Yes,
it's possible to overload it anywhere else, but you better shouldn't
even think about it.