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OpenGL OpenGL real FPS

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I am curios how can i make OpenGL show the real FPS - cause like i do it the maximum frames per seconds that i get its the refresh rate of my monitor. I do it like this: static float fps = 0.0f; static float lastTime = 0.0f; static char strFrameRate[50] = {0}; float currentTime = GetTickCount() * 0.001f; ++fps; if(currentTime - lastTime >1.0f) { lastTime=currentTime; sprintf(strFrameRate,"Current frames per second: %d", int(fps)); fps=0; } return strFrameRate; Thanks

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