glXCreateNewContext(3G) OpenGL Reference - GLX glXCreateNewContext(3G)NAME
glXCreateNewContext - create a new GLX rendering context
C SPECIFICATION
GLXContext glXCreateNewContext( Display *dpy,
GLXFBConfig config,
int render_type,
GLXContext share_list,
Bool direct )
PARAMETERS
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).
DESCRIPTION
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
Page 1
glXCreateNewContext(3G) OpenGL Reference - GLX glXCreateNewContext(3G)
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.
NOTES
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.
ERRORS
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).
SEE ALSO
glXChooseFBConfig, glXCreateContext, glXDestroyContext, glXGetFBConfigs,
glXGetFBConfigAttrib, glXIsDirect, glXMakeContextCurrent
Page 2
