2005 Sams Publishing glIsQuery 3G glIsQuery determine if a name corresponds to a query object GLboolean glIsQuery GLuint id id Specifies a value that may be the name of a query object. 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. glIsQuery is available only if the GL version is 1.5 or greater. GL_INVALID_OPERATION is generated if glIsQuery is executed between the execution of glBegin and the corresponding execution of glEnd. 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/.