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A minimal portable API for embeddable GUIs

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Pugl

Pugl (PlUgin Graphics Library) is a minimal portability layer for GUIs which is suitable for use in plugins and applications. It works on X11, MacOS, and Windows, and includes optional support for drawing with Vulkan, OpenGL, and Cairo.

Pugl is vaguely similar to libraries like GLUT and GLFW, but has different goals and priorities:

  • Minimal in scope, providing only a thin interface to isolate platform-specific details from applications.

  • Zero dependencies, aside from standard system libraries.

  • Support for embedding in native windows, for example as a plugin or component within a larger application that is not based on Pugl.

  • Explicit context and no static data, so that several instances can be used within a single program at once.

  • Consistent event-based API that makes dispatching in application or toolkit code easy with minimal boilerplate.

  • Suitable for both continuously rendering applications like games, and event-driven applications that only draw when necessary.

  • Well-integrated with windowing systems, with support for tracking and manipulating special window types, states, and styles.

  • Small, liberally licensed implementation that is suitable for vendoring and/or static linking. Pugl can be installed as a library, or used by simply copying the implementation into a project.

Stability

Pugl is currently being developed towards a long-term stable API. For the time being, however, the API may break occasionally. Please report any relevant feedback, or file feature requests, so that we can ensure that the released API is stable for as long as possible.

When the API changes, backwards compatibility is maintained where possible. These compatibility shims will be removed before release, so users are encouraged to build with PUGL_DISABLE_DEPRECATED defined.

Documentation

Pugl is a C library that includes C++ bindings. The reference documentation refers to the C API:

The documentation will also be built from the source if the docs configuration option is enabled, and both Doxygen and Sphinx are available.

The C++ documentation is currently a work in progress, for now you will have to refer to the examples or headers for guidance on using the C++ bindings.

Testing

Some unit tests are included, but unfortunately manual testing is still required. The tests and example programs are built by default. You can run all the tests at once via ninja:

meson setup build
cd build
ninja test

The examples directory contains several demonstration programs that can be used for manual testing.

-- David Robillard [email protected]

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