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GLXMAKECONTEXTCURREN(3G)	 OpenGL Manual	      GLXMAKECONTEXTCURREN(3G)

NAME
       glXMakeContextCurrent - attach a GLX context to a GLX drawable

C SPECIFICATION
       Bool glXMakeContextCurrent(Display * display, GLXDrawable draw,
				  GLXDrawable read, GLXContext ctx);

PARAMETERS
       display
	   Specifies the connection to the X server.

       draw
	   Specifies a GLX drawable to render into. Must be an XID
	   representing a GLXWindow, GLXPixmap, or GLXPbuffer.

       read
	   Specifies a GLX drawable to read from. Must be an XID representing
	   a GLXWindow, GLXPixmap, or GLXPbuffer.

       ctx
	   Specifies the GLX context to be bound to read and ctx.

DESCRIPTION
       glXMakeContextCurrent binds ctx to the current rendering thread and to
       the draw and read GLX drawables.	 draw and read may be the same.

       draw is used for all OpenGL operations except:

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

       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 draw.

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

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

       To release the current context without assigning a new one, call
       glXMakeContextCurrent with draw and read set to None and ctx set to
       NULL.

       glXMakeContextCurrent returns True if it is successful, False
       otherwise. If False is returned, the previously current rendering
       context and drawable (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
       is 1.3, then the GL version must be 1.2.

ERRORS
       BadMatch is generated if draw and read are not compatible.

       BadAccess is generated if ctx is current to some other thread.

       GLXContextState is generated if there is a current rendering context
       and its render mode is either GLX_FEEDBACK or GLX_SELECT.

       GLXBadContext is generated if ctx is not a valid GLX rendering context.

       GLXBadDrawable is generated if draw or read is not a valid GLX
       drawable.

       GLXBadWindow is generated if the underlying X window for either draw or
       read is no longer valid.

       GLXBadCurrentDrawable is generated if the previous context of the
       calling 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:

       draw and read cannot fit into frame buffer memory simultaneously.

       draw or read is a GLXPixmap and ctx is a direct-rendering context.

       draw or read is a GLXPixmap and ctx was previously bound to a GLXWindow
       or GLXPbuffer.

       draw or read is a GLXWindow or GLXPbuffer and ctx was previously bound
       to a GLXPixmap.

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

COPYRIGHT
       Copyright © 1991-2006 Silicon Graphics, Inc. This document is licensed
       under the SGI Free Software B License. For details, see
       http://oss.sgi.com/projects/FreeB/.

AUTHORS
       opengl.org

opengl.org			  03/16/2013	      GLXMAKECONTEXTCURREN(3G)

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