void glXCopyContext(Display *dpy, GLXContext src, GLXContext dst, GLuint mask)
The copy can be done only if the renderers named by src and dst share an 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.
Not all values for OpenGL state can be copied. For example, pixel pack and unpack state, render mode state, and select and feedback state are not copied. The state that can be copied is exactly the state that is manipulated by OpenGL command glPushAttrib.
If src is not the current context for the thread issuing the request, then the state of the src context is undefined.
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.
BadAccess is generated if dst is current to any thread (including the calling thread) at the time glXCopyContext is called.
GLX_BAD_CURRENT_WINDOW is generated if src is the current context and the current drawable is a window that is no longer valid.
GLX_BAD_CONTEXT is generated if either src or dst is not a valid GLX context.
BadValue is generated if undefined mask bits are specified.
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© 1995 Uwe Behrens All rights reserved