glXCreateNewContext — create a new GLX rendering context
GLXContext glXCreateNewContext( | Display * | dpy, |
GLXFBConfig | config, | |
int | render_type, | |
GLXContext | share_list, | |
Bool | direct) ; |
dpy
Specifies the connection to the X server.
config
Specifies the GLXFBConfig structure with the desired attributes for the context.
render_type
Specifies the type of the context to be created. Must be one of
GLX_RGBA_TYPE
or GLX_COLOR_INDEX_TYPE
.
share_list
Specifies the context with which to share display lists.
NULL
indicates that no sharing is to take place.
share_list
Specifies whether rendering is to be done with a direct connection
to the graphics system if possible (True
)
or through the X server (False
).
glXCreateNewContext
creates a GLX rendering context and returns its handle.
This context can be used to render into GLX windows, pixmaps, or pixel
buffers.
If glXCreateNewContext
fails to create a rendering context,
NULL
is returned.
If render_type
is GLX_RGBA_TYPE
, then a context that supports RGBA
rendering is created. If config
is GLX_COLOR_INDEX_TYPE
, then
context supporting color-index rendering is created.
If render_type
is not NULL
,
then all display-list indexes and definitions are shared by
context render_type
and by the newly created context.
An arbitrary number of contexts can share a single display-list space.
However,
all rendering contexts that share a single display-list space must
themselves exist in the same address space.
Two rendering contexts share an address space if both are nondirect
using the same server,
or if both are direct and owned by a single process.
Note that in the nondirect case, it is not necessary for the calling
threads to share an address space,
only for their related rendering contexts to share an address space.
If share_list
is True
,
then a direct-rendering context is created if the
implementation supports direct rendering, if the connection is to an X
server that is local, and if a direct-rendering context is available. (An implementation may return an indirect context when share_list
is True
.)
If share_list
is False
,
then a rendering context that renders through the X server is always created.
Direct rendering provides a performance advantage in some implementations.
However, direct-rendering contexts cannot be shared outside a single process,
and they may be unable to render to GLX pixmaps.
glXCreateNewContext
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.
NULL
is returned if execution fails on the client side.
GLXBadContext
is generated if render_type
is not a GLX context
and is not NULL
.
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 render_type
.
BadAlloc
is generated if the server does not have enough
resources to allocate the new context.
BadValue
is generated if config
is not a valid visual (for
example, if a particular GLX implementation does not support it).
glXChooseFBConfig, glXCreateContext, glXDestroyContext, glXGetFBConfigs, glXGetFBConfigAttrib, glXIsDirect, glXMakeContextCurrent
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/.