GLXDrawable dra )

PARAMETERS
       dpy  Specifies the connection to the X server.

       dra  Specifies  a GLX drawable that to render into.  Must be an XID rep‐
            resenting a GLXWindow, GLXPixmap, or GLXPbuffer.

       _param3
            Specifies a GLX drawable that to read from.  Must be an XID  repre‐
            senting a GLXWindow, GLXPixmap, or GLXPbuffer.

       _param4
            Specifies the GLX context to be bound to _param3 and _param4.

DESCRIPTION
       glXMakeContextCurrent  binds _param4 to the current rendering thread and
       to the dra and _param3 GLX drawables. dra and _param3 may be the same.

       dra is used for all OpenGL operations except:

         Any pixel data that are read based on  the  value  of  GL_READ_BUFFER.
         Note that accumulation operations use the value of GL_READ_BUFFER, but
         are not allowed unless dra is identical to _param3.

         Any depth values that are retrieved by glReadPixels or glCopyPixels.

         Any stencil values that are retrieved by glReadPixels or glCopyPixels.

Frame buffer values are taken from dra.

       If the current rendering thread has a current  rendering  context,  that
       context is flushed and replaced by _param4.

       The  first  time  that _param4 is made current, the viewport and scissor
       dimensions are set to the size of the dra drawable.   The  viewport  and
       scissor are not modified when _param4 is subsequently made current.

       To  release  the  current  context  without  assigning  a  new one, call
       glXMakeContextCurrent with dra and _param3 set to None and  _param4  set
       to NULL.

       glXMakeContextCurrent 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
       glXMakeContextCurrent  is  available  only  if the GLX version is 1.3 or
       greater.

       If the GLX version is 1.1 or 1.0, the GL version must be  1.0.   If  the
       GLX version is 1.2, then the GL version must be 1.1.  If the GLX version
       able.

       GLXBadWindow  is  generated if the underlying X window for either dra or
       _param3 is no longer valid.

       GLXBadCurrentDrawable is generated if the previous context of the  call‐
       ing  thread  has  unflushed  commands,  and  the previous drawable is no
       longer valid.

       BadAlloc is generated if the X server does not have enough resources  to
       allocate the buffers.

       BadMatch is generated if:

         dra and _param3 cannot fit into frame buffer memory simultaneously.

         dra  or  _param3 is a GLXPixmap and _param4 is a direct rendering con‐
         text.

         dra or _param3 is a GLXPixmap and _param4 was previously  bound  to  a
         GLXWindow or GLXPbuffer.

         dra or _param3 is a GLXWindow or GLXPbuffer and _param4 was previously
         bound to a GLXPixmap.

SEE ALSO
       glXCreateNewContext, glXCreateWindow, glXCreatePixmap, glXCreatePbuffer,
       glXDestroyContext,      glXGetCurrentContext,      glXGetCurrentDisplay,
       glXGetCurrentDrawable, glXGetCurrentReadDrawable, glXMakeCurrent

                                                      GLXMAKECONTEXTCURRENT(3G)