glXMakeCurrent()glXMakeCurrent()NAMEglXMakeCurrent - attach a GLX context to a window or a GLX pixmap
SYNOPSIS
Bool glXMakeCurrent(
Display *dpy,
GLXDrawable drawable,
GLXContext ctx );
PARAMETERS
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 ren‐
dering context that is to be attached to drawable.
DESCRIPTIONglXMakeCurrent() does two things: It makes ctx the current GLX render‐
ing 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
drawable. Because glXMakeCurrent() always replaces the current render‐
ing context with ctx, 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 drawable. Subsequent calls by any thread to glX‐
MakeCurrent() with ctx have no effect on its viewport.
To release the current context without assigning a new one, call glX‐
MakeCurrent() with drawable set None and ctx set to NULL
glXMakeCurrent() returns True if it is successful, False otherwise. If
False is returned, the previously current rendering context and draw‐
able (if any) remain unchanged.
NOTES
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.
ERRORS
BadMatch is generated if drawable was not created with the same X
screen and visual as ctx. It is also generated if drawable is None and
ctx is not NULL.
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 generated if glXMakeCurrent() is executed between
the execution of glBegin() and the corresponding execution of glEnd().
GLXBadContextState is also generated if the rendering context current
to the calling thread has GL renderer state GL_FEEDBACK or GL_SELECT.
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.
SEE ALSOglXCreateContext(), glXCreateGLXPixmap()glXMakeCurrent()
