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GLXCREATENEWCONTEXT(3gl)			      GLXCREATENEWCONTEXT(3gl)

NAME
       glXCreateNewContext - create a new GLX rendering context

C SPECIFICATION
       GLXContext glXCreateNewContext( Display *dpy,
				 GLXFBConfig config,
				 int render_type,
				 GLXContext shareList,
				 Bool direct )

PARAMETERS
       dpy	  Specifies the connection to the X server.

       config	  Specifies the config that defines the frame buffer resources
		  available to the rendering context.

       render_type
		  Specifies the rendering type of the context. Allowed	values
		  are GLX_RGBA_TYPE  or GLX_COLOR_INDEX_TYPE.

       shareList  Specifies  the  context  with	 which to share display lists.
		  NULL indicates that no sharing is to take place.

       direct	  Specifies whether rendering is to be done with a direct con‐
		  nection to the graphics system if possible (True) or through
		  the X server (False).

DESCRIPTION
       glXCreateNewContext is identical to glXCreateContext  except  that  the
       resulting   GLXContext  can  be used to render to any "compatible" GLX‐
       Drawable. A GLXContext and a GLXDrawable are compatible if:

       a.     the render_type attribute for the context is  supported  by  the
	      GLXFBConfig  that	 the  drawable was created with. (e.g., if the
	      context was created with	render_type  GLX_RGBA_TYPE,  then  the
	      GLXFBConfig's    GLX_RENDER_TYPE	 attribute   must   have   the
	      GLX_RGBA_BIT bit set.)

       b.     all color buffers and ancillary buffers that exist in both GLXF‐
	      BConfigs	have  the  same depth. For example, a GLXDrawable that
	      had a front left buffer and a back left buffer with  red,	 green
	      and  blue	 sizes of 4 would not be compatible with a GLXFBConfig
	      that had	only a front left buffer  with	red,  green  and  blue
	      sizes  of	 8. However, it would be compatible with a GLXFBConfig
	      that had only a front left buffer if the	red,  green  and  blue
	      sizes were 4.

       No  error will be generated if the value of GL_DRAW_BUFFER in ctx indi‐
       cates a color buffer that is not supported by drawable. In  this	 case,
       all  rendering  will  behave as if GL_DRAW_BUFFER was  set to NONE. The
       same is true for GL_READ_BUFFER: no error will be generated if it  does
       not  correspond	to  a  valid  color buffer; subsequent glReadPixel and
       glCopyPixel operations will simply  return invalid data.

       Note that it is an error to later call glDrawBuffer and/or glReadBuffer
       (even  if  they	are  implicitly	 called via glPopAttrib) and specify a
       color buffer that is not supported by drawable.	Also subsequent	 calls
       to  glCopyPixels,  that	specify	 an unsupported ancillary buffer, will
       result in an error.

NOTES
       glXCreateNewContext is part of the GLX Version  1.3  command  set.  The
       function	 is  only  valid if the connection supports GLX Version 1.3 or
       later.

ERRORS
       GLXBadContext is generated if sharelist is neither zero nor a valid GLX
       rendering context.

       GLXBadFBConfig is generated if config is not a valid GLXFBConfig.

       BadMatch	 is generated if the context to be created would not share the
       address space or the screen of the context specified by shareList.

       BadAlloc is generated if the server does not have enough	 resources  to
       allocate the new context.

       BadValue if render_type does not refer to a valid rendering type.

       NULL is returned if execution fails on the client side.

SEE ALSO
       glXMakeCurrent,	 glXMakeContextCurrent,	  glDrawBuffer,	 glReadBuffer,
       glCopyPixels, glReadPixels, glPopAttrib,	 glXCreateContext,  glXGetCon‐
       figFromVisual, glXCreateWindow, glXCreatePixmap, glXCreatePbuffer, glX‐
       ChooseFBConfig, glXGetFBConfigAttrib

				   18 May 01	      GLXCREATENEWCONTEXT(3gl)
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