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/**
* Copyright 2011 JogAmp Community. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are
* permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this list of
* conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice, this list
* of conditions and the following disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY JogAmp Community ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JogAmp Community OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* The views and conclusions contained in the software and documentation are those of the
* authors and should not be interpreted as representing official policies, either expressed
* or implied, of JogAmp Community.
*/
package javax.media.opengl;
import java.io.PrintStream;
/**
* FPSCounter feature.<br>
* An implementation initially has the FPSCounter feature disabled.<br>
* Use {@link #setUpdateFPSFrames(int, PrintStream)} to enable and disable the FPSCounter feature.
*/
public interface FPSCounter {
public static final int DEFAULT_FRAMES_PER_INTERVAL = 60;
/**
* @param frames Update interval in frames.<br> At every rendered <i>frames</i> interval the currentTime and fps values are updated.
* If the <i>frames</i> interval is <= 0, no update will be issued, ie the FPSCounter feature is turned off. You may choose {@link #DEFAULT_FRAMES_PER_INTERVAL}.
* @param out optional print stream where the fps values gets printed if not null at every <i>frames</i> interval
*/
void setUpdateFPSFrames(int frames, PrintStream out);
/**
* Reset all performance counter (startTime, currentTime, frame number)
*/
void resetFPSCounter();
/**
* @return update interval in frames
*
* @see #setUpdateFPSFrames(int, PrintStream)
*/
int getUpdateFPSFrames();
/**
* Returns the time of the first display call in milliseconds after enabling this feature via {@link #setUpdateFPSFrames(int, PrintStream)}.<br>
* This value is reset via {@link #resetFPSCounter()}.
*
* @see #setUpdateFPSFrames(int, PrintStream)
* @see #resetFPSCounter()
*/
long getFPSStartTime();
/**
* Returns the time of the last update interval in milliseconds, if this feature is enabled via {@link #setUpdateFPSFrames(int, PrintStream)}.<br>
* This value is reset via {@link #resetFPSCounter()}.
*
* @see #setUpdateFPSFrames(int, PrintStream)
* @see #resetFPSCounter()
*/
long getLastFPSUpdateTime();
/**
* @return Duration of the last update interval in milliseconds.
*
* @see #setUpdateFPSFrames(int, PrintStream)
* @see #resetFPSCounter()
*/
long getLastFPSPeriod();
/**
* @return Last update interval's frames per seconds, {@link #getUpdateFPSFrames()} / {@link #getLastFPSPeriod()}
*
* @see #setUpdateFPSFrames(int, PrintStream)
* @see #resetFPSCounter()
*/
float getLastFPS();
/**
* @return Number of frame rendered since {@link #getFPSStartTime()} up to {@link #getLastFPSUpdateTime()}
*
* @see #setUpdateFPSFrames(int, PrintStream)
* @see #resetFPSCounter()
*/
int getTotalFPSFrames();
/**
* @return Total duration in milliseconds, {@link #getLastFPSUpdateTime()} - {@link #getFPSStartTime()}
*
* @see #setUpdateFPSFrames(int, PrintStream)
* @see #resetFPSCounter()
*/
long getTotalFPSDuration();
/**
* @return Total frames per seconds, {@link #getTotalFPSFrames()} / {@link #getTotalFPSDuration()}
*
* @see #setUpdateFPSFrames(int, PrintStream)
* @see #resetFPSCounter()
*/
float getTotalFPS();
}
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