GLXMAKECURRENT() UNIX Programmer's Manual GLXMAKECURRENT()
glXMakeCurrent - attach a GLX context to a window or a GLX
pixmap
Bool glXMakeCurrent( Display *dpy,
GLXDrawable drawable,
GLXContext ctx )
dpy Specifies the connection to the X server.
drawable Specifies a GLX drawable. Must be either an X win-
dow ID or a GLX pixmap ID.
ctx Specifies a GLX rendering context that is to be
attached to drawable.
glXMakeCurrent does two things: It makes ctx the current GLX
rendering context of the calling thread, replacing the pre-
viously 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 rendering
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 glXMakeCurrent with ctx have no
effect on its viewport.
To release the current context without assigning a new one,
call glXMakeCurrent with drawable set None and ctx set to
NULL
glXMakeCurrent returns True if it is successful, False oth-
erwise. If False is returned, the previously current render-
ing 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.
MirOS BSD #10-current Printed 20.2.2012 1
GLXMAKECURRENT() UNIX Programmer's Manual GLXMAKECURRENT()
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 pro-
cess.
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 con-
text.
GLXBadContextState is generated if glXMakeCurrent is exe-
cuted between the execution of glBegin and the corresponding
execution of glEnd.
GLXBadContextState is also generated if the rendering con-
text 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 alloca-
tion of ancillary buffers until glXMakeCurrent is called,
only to find that it has insufficient resources to complete
the allocation.
glXCreateContext, glXCreateGLXPixmap
MirOS BSD #10-current Printed 20.2.2012 2
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