glXMakeCurrent — attach a GLX context to a window or a GLX pixmap
Specifies the connection to the X server.
Specifies a GLX drawable. Must be either an X window ID or a GLX pixmap ID.
Specifies a GLX rendering context that is to be attached to
glXMakeCurrent does two things:
ctx the current GLX rendering context of the calling thread,
replacing the previously current context if there was one,
and it attaches
ctx to a GLX drawable,
either a window or a GLX pixmap.
As a result of these two actions,
subsequent GL rendering calls
use rendering context
ctx to modify GLX drawable
reading and writing).
glXMakeCurrent always replaces the current rendering context with
there can be only one current context per thread.
Pending commands to the previous context, if any, are flushed before it is released.
The first time
ctx is made current to any thread,
its viewport is set to the full size of
Subsequent calls by any thread to
have no effect on its viewport.
To release the current context without assigning a new one,
drawable set to
True if it is successful,
False is returned, the previously current rendering context
and drawable (if any) remain unchanged.
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
drawable was not
created with the same X screen and visual as
It is also generated if
ctx is not
BadAccess is generated if
ctx was current to another thread
at the time
glXMakeCurrent was called.
GLXBadDrawable is generated if
drawable is not a valid GLX drawable.
GLXBadContext is generated if
ctx is not a valid GLX context.
GLXBadContextState is also generated if the rendering context current
to the calling thread has GL renderer state
GLXBadCurrentWindow is generated if there are pending GL
commands for the previous context and the current drawable is
a window that is no longer valid.
BadAlloc may be generated if the server has delayed allocation
of ancillary buffers until
glXMakeCurrent is called, only to find that it has
insufficient resources to complete the allocation.
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