DragonFly On-Line Manual Pages

GLXMAKECURRENT()                                              GLXMAKECURRENT()

NAME
       glXMakeCurrent - attach a GLX context to a window or a GLX pixmap

C SPECIFICATION
       Bool glXMakeCurrent( Display *dpy,
                            GLXDrawable drawable,
                            GLXContext ctx )

PARAMETERS
       dpy       Specifies the connection to the X server.

       drawable  Specifies a GLX drawable.  Must be either an X window ID or a
                 GLX pixmap ID.

       ctx       Specifies a GLX rendering context that is to be attached to
                 drawable.

DESCRIPTION
       glXMakeCurrent does two things: It makes 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
       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 otherwise.  If
       False is returned, the previously current rendering context and
       drawable (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 ALSO
       glXCreateContext, glXCreateGLXPixmap

                                                              GLXMAKECURRENT()