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bugle-contextattribs — override attributes during context creation


filterset contextattribs
    major 3
    minor 3
    flag "debug"
    flag "robust"
    profile "core"
    profile "!compatibility"


The GLX_ARB_context_create and GLX_ARB_context_create_profile extensions allow applications extra control over how contexts are created. Applications can specify a GL version, select flags that modify the operation of the context, or specify which GL profiles they wish to use.

The contextattribs filter-set allows these attributes to be overridden on an existing application. There are a number of reasons this might be desirable:

  • If the application is using a framework that does not allow these attributes to be specified, this may be the easiest way to do so.

  • Forcing the core profile can be used to identify areas of the application that rely on the compatibility profile.

  • Forcing a debug context will allow the bugle-logdebug(7) filter-set to record debugging information from the driver.

The interface provided is fairly low-level. The major version, the minor version, and each bit in the flags and the profile mask can be either left alone or set to a specific value. There are no checks that the requested combination makes sense e.g., versions of GL before 3.2 did not have profiles.



Specifies a value for GLX_CONTEXT_MAJOR_VERSION_ARB.


Specifies a value for GLX_CONTEXT_MINOR_VERSION_ARB.


Specifies a flag to be added or removed from GLX_CONTEXT_FLAGS_ARB. The available flags are debug, forward and robust. By default a flag is added to the flag mask, but if preceeded by a ! it is removed.

This option may be given multiple times to override multiple flags. Specifying that a flag should be both added and removed has undefined results.


This option works similarly to flag except that it affects GLX_CONTEXT_PROFILE_MASK_ARB. The available profiles are core, compatibility and es2.

Note that because this is a mask, the correct way to force core profile is to specify both core and !compatibility.


This filter-set is currently only implemented for GLX.


bugle is written and maintained by Bruce Merry.

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