source: trunk/packages/vizservers/nanovis/PerfQuery.cpp @ 1353

/*
 * ----------------------------------------------------------------------
 * PerfQuery.cpp: performance query class
 *
 * ======================================================================
 *  AUTHOR:  Wei Qiao <qiaow@purdue.edu>
 *           Purdue Rendering and Perceptualization Lab (PURPL)
 *
 *  Copyright (c) 2004-2006  Purdue Research Foundation
 *
 *  See the file "license.terms" for information on usage and
 *  redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 * ======================================================================
 */

#include <assert.h>
#include "PerfQuery.h"


PerfQuery::PerfQuery(){
  glGenQueriesARB(1, &id);
  pixel = 0;
}

PerfQuery::~PerfQuery(){
  glDeleteQueriesARB(1, &id);
}

//There can only be one active query at any given moment
void PerfQuery::enable(){
  glBeginQueryARB(GL_SAMPLES_PASSED_ARB, id);
}

void PerfQuery::disable(){
  glEndQueryARB(GL_SAMPLES_PASSED_ARB);

  GLuint count;
  glGetQueryObjectuivARB(id, GL_QUERY_RESULT_ARB, &count);

  //accumulate pixel count count
  pixel+=count;
}