glBeginQuery, glEndQuery, glGetQueryiv, glIsQuery
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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glGetQueryObject: man2/glGetQueryObject.xml
glGetQueryObject returns in params a selected parameter of the query object specified by id. pname names a specific query object parameter. pname can be as follows:
If an error is generated, no change is made to the contents of params. glGetQueryObject implicitly flushes the GL pipeline so that any incomplete rendering delimited by the occlusion query completes in finite time. If multiple queries are issued using the same query object id before calling glGetQueryObject, the results of the most recent query will be returned. In this case, when issuing a new query, the results of the previous query are discarded. glGetQueryObject is available only if the GL version is 1.5 or greater.