GLXContext glXCreateContext(Display *dpy, XVisualInfo *vis, GLXContext shareList, Bool direct)
If direct is True, then a direct rendering context is created if the implementation supports direct rendering and the connection is to an X server that is local. If direct is False, then a rendering context that renders through the X server is always created. Direct rendering provides a performance advantage in some implementations. However, direct rendering contexts cannot be shared outside a single process, and they cannot be used to render to GLX pixmaps.
If shareList is not NULL, then all display-list indexes and definitions are shared by context shareList and by the newly created context. An arbitrary number of contexts can share a single display-list space. However, all rendering contexts that share a single display-list space must themselves exist in the same address space. Two rendering contexts share an address space if both are nondirect using the same server, or if both are direct and owned by a single process. Note that in the nondirect case, it is not necessary for the calling threads to share an address space, only for their related rendering contexts to share an address space.
A process is a single execution environment, implemented in a single address space, consisting of one or more threads.
A thread is one of a set of subprocesses that share a single address space, but maintain separate program counters, stack spaces, and other related global data. A thread that is the only member of its subprocess group is equivalent to a process.
BadMatch is generated if the context to be created would not share the address space of the context specified by shareList or if the specified visual is not available.
BadValue is generated if vis specifies an invalid screen number.
GLX_BAD_CONTEXT is generated if shareList is not a GLX context and is not NULL.
BadAlloc is generated if the server does not have enough resources to allocate the new context.
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© 1995 Uwe Behrens All rights reserved