glGetQueryObject â return parameters of a query object
void glGetQueryObjectiv( | GLuint  | id, |
|  | GLenum  | pname, |
| Â | GLint * Â | params); |
void glGetQueryObjectuiv( | GLuint  | id, |
|  | GLenum  | pname, |
| Â | GLuint * Â | params); |
void glGetQueryObjecti64v( | GLuint  | id, |
|  | GLenum  | pname, |
| Â | GLint64 * Â | params); |
void glGetQueryObjectui64v( | GLuint  | id, |
|  | GLenum  | pname, |
| Â | GLuint64 * Â | params); |
id+ Specifies the name of a query object. +
pname
+ Specifies the symbolic name of a query object parameter.
+ Accepted values are GL_QUERY_RESULT or GL_QUERY_RESULT_AVAILABLE.
+
params+ Returns the requested data. +
+ 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:
+
GL_QUERY_RESULT
+ params returns the value of the query object's passed samples counter.
+ The initial value is 0.
+
GL_QUERY_RESULT_AVAILABLE
+ params returns whether the passed samples counter is immediately available.
+ If a delay would occur waiting for the query result, GL_FALSE is returned.
+ Otherwise, GL_TRUE is returned, which also indicates that the results of all
+ previous queries are available as well.
+
+ 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.
+
+ glGetQueryObjecti64v and glGetQueryObjectui64v are available only
+ if the GL version is 3.3 or greater.
+
+ GL_INVALID_ENUM is generated if pname is not an accepted value.
+
+ GL_INVALID_OPERATION is generated if id is not the name of a query object.
+
+ GL_INVALID_OPERATION is generated if id is the name of a currently active
+ query object.
+
+ 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/. +