glBeginQuery, glDeleteQueries, glEndQuery, glGenQueries
Copyright 2005 Addison-Wesley. This material may be distributed subject to the terms and conditions set forth in the Open Publication License, v 1.0, 8 June 1999. http://opencontent.org/openpub/.
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glIsQuery: man3/glIsQuery.xml
glIsQuery returns GL_TRUE if id is currently the name of a query object. If id is zero, or is a non-zero value that is not currently the name of a query object, or if an error occurs, glIsQuery returns GL_FALSE. A name returned by glGenQueries, but not yet associated with a query object by calling glBeginQuery, is not the name of a query object.