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These only do anything for OpenGL, and it seems unlikely that they will ever be
used for anything else. So, move them to the GL headers to remove clutter from
the core API, and ensure that they are only used in GL applications that
include the appropriate headers and link with a GL backend.
Also add missing C++ bindings.
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This was missing from the C++ bindings and barely used anyway, so just remove
it for now in the interests of simplicity and finalizing a stable API.
The information previously logged in the X11 GL backend is now available
programatically, so applications can print the same information portably if
they like.
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This allows the application to control how recursive loops are handled rather
than have Pugl impose behavior which can get in the way. For example, an
application may not want to continuously animate while being resized, or set up
its rendering differently in this situation. For example, with Vulkan, setting
up a different swapchain can be necessary for smooth performance while live
resizing on Windows, and Pugl has no ability to do this.
I think it was a mistake to add this timer to Pugl itself, because it was
always a bit of a leaky abstraction, and not very appropriate for a library
that is supposed to be a thin abstraction layer. Though it almost seemed like
things ran as usual while resizing on Windows and MacOS, the main event loop
being stalled can be confusing, and there was no way to detect this. This way,
applications must explicitly handle this situation and can implement the
behavior they want without Pugl getting in the way.
This also simplifies the Pugl implementation a bit, which is always nice.
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Even though loading is now better handled with create events, there are still
situations with OpenGL where it's difficult to avoid explicitly entering and
leaving the context. So, resurrect these functions, but remove the drawing
parameter to make it clear that they must never be used for drawing.
This breaks the deprecated API since the drawing parameter would be
inappropriate for the stable API, and a decent alternative name isn't
available.
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This is more conventional and directories named "include" are specially
understood by some tooling like clang-tidy.
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