glGetQueryObject, glIsQuery
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glGetQueryiv: man4/glGetQueryiv.xml
glGetQueryiv returns in params a selected parameter of the query object target specified by target. pname names a specific query object target parameter. When pname is GL_CURRENT_QUERY, the name of the currently active query for target, or zero if no query is active, will be placed in params. If pname is GL_QUERY_COUNTER_BITS, the implementation-dependent number of bits used to hold the result of queries for target is returned in params.
The target GL_ANY_SAMPLES_PASSED_CONSERVATIVE is available only if the GL version is 4.3 or greater. If an error is generated, no change is made to the contents of params.