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103 lines
1.7 KiB
103 lines
1.7 KiB
package mightypork.utils.math.timing;
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/**
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* Timer for interpolated timing
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*
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* @author Ondřej Hruška (MightyPork)
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*/
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public class TimerFps {
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private long lastFrame = 0;
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private long nextFrame = 0;
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private long skipped = 0;
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private long lastSkipped = 0;
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private static final long SECOND = 1000000000; // a million nanoseconds
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private final long FRAME; // a time of one frame in nanoseconds
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/**
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* New interpolated timer
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*
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* @param fps target FPS
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*/
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public TimerFps(long fps) {
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FRAME = Math.round(SECOND / (double) fps);
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lastFrame = System.nanoTime();
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nextFrame = System.nanoTime() + FRAME;
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}
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/**
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* Sync and calculate dropped frames etc.
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*/
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public void sync()
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{
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final long time = getTime();
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if (time >= nextFrame) {
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final long skippedNow = (long) Math.floor((time - nextFrame) / (double) FRAME) + 1;
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skipped += skippedNow;
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lastFrame = nextFrame + (1 - skippedNow) * FRAME;
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nextFrame += skippedNow * FRAME;
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}
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}
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/**
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* Get nanotime
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*
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* @return nanotime
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*/
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public long getTime()
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{
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return System.nanoTime();
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}
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/**
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* Get fraction of next frame
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*
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* @return fraction
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*/
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public double getFraction()
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{
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if (getSkipped() >= 1) {
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return 1;
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}
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final long time = getTime();
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if (time <= nextFrame) {
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return (double) (time - lastFrame) / (double) FRAME;
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}
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return 1;
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}
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/**
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* Get number of elapsed ticks
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*
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* @return ticks
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*/
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public int getSkipped()
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{
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final long change = skipped - lastSkipped;
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lastSkipped = skipped;
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return (int) change;
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}
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/**
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* Clear timer and start counting new tick.
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*/
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public void startNewFrame()
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{
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final long time = getTime();
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lastFrame = time;
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nextFrame = time + FRAME;
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lastSkipped = skipped;
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}
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}
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