.. _envvars:

Environment Variables
=====================

There are a number of environment variables that change the runtime behavior of the ImFusionLib.

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Name                                Default     Description
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IMFUSION_GL_BACKEND                 glx         Determines the interface that is used to create an OpenGL context. Supported values are 'glx' and 'egl'.
IMFUSION_USE_OPENGL_COMPATIBILITY   <empty>     If set, a an OpenGL context with the compatibility profile is created. Otherwise core profile is used.
IMFUSION_USE_OPENGL_DEBUG_CONTEXT   <empty>     If set, a debug OpenGL context is created (see `KHR_debug extenion <https://registry.khronos.org/OpenGL/extensions/KHR/KHR_debug.txt>`_).
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