GLX_EXT_import_context
http://www.opengl.org/registry/specs/EXT/import_context.txt
GLX_EXT_import_context
GLX_SHARE_CONTEXT_EXT 0x800A
GLX_VISUAL_ID_EXT 0x800B
GLX_SCREEN_EXT 0x800C
void glXFreeContextEXT (Display* dpy, GLXContext context)
GLXContextID glXGetContextIDEXT (const GLXContext context)
GLXContext glXImportContextEXT (Display* dpy, GLXContextID contextID)
int glXQueryContextInfoEXT (Display* dpy, GLXContext context, int attribute,int *value)
typedef XID GLXContextID