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First code import.
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src/java/org/lwjgl/Sys.java
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130
src/java/org/lwjgl/Sys.java
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/**
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* (C) 2002 Shaven Puppy Ltd
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*
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* Sys.java Created on Aug 1, 2002 by foo
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*/
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package org.lwjgl;
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import java.nio.Buffer;
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import java.nio.ByteBuffer;
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/**
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* (C) 2002 Shaven Puppy Ltd
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*
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* Sys.java Created on Aug 1, 2002 by foo
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*/
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/**
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* System class (named Sys so as not to conflict with java.lang.Sys)
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*
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* @author foo
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*/
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public final class Sys {
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static {
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initialize();
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}
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/** The native library name */
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public static final String LIBRARY_NAME = "lwjgl";
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/**
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* No constructor for Sys.
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*/
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private Sys() {
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}
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/**
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* Initialization.
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*/
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private static void initialize() {
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System.loadLibrary(LIBRARY_NAME);
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setTime(0.0f);
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}
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/**
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* Gets the address of a buffer. If the address cannot be obtained for any reason
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* then this method returns 0.
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*
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* @param buffer The buffer for which you want the
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* @return the address of the direct buffer passed in
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*/
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public static native int getDirectBufferAddress(Buffer buffer);
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/**
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* Create a direct byte buffer at the specified address with the specified
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* capacity. Note that no actual memory allocation is performed. The returned
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* direct byte buffer is in native endian order.
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*
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* @param address The address of the buffer
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* @param length The length in bytes that the buffer should have
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* @return a direct ByteBuffer
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* @throws IllegalArgumentException if address <1 or length <1
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*/
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public static native ByteBuffer createDirectBuffer(int address, int length)
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throws IllegalArgumentException;
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/**
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* Obtains the order of resolution of the hires system timer. The returned resolution
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* <i>n</i> describes the worst-case resolution in fractions of a second <i>1/10^n</i>.
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* For example, a system timer which ticks every 1/5000th of a second will return 3
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* to indicate that the resolution is at least as good as 1/1000th of a second.
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* The reason for this simplistic measurement of resolution is to cut down on
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* the temptation to code to too many specific timer resolutions arbitrarily.
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* If no hires timer is available then this method returns -1. Any system incapable of
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* a resolution of at least 3 is deemed not to have a hires timer and so this method will
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* never return 0, 1, or 2. Furthermore this method will never advertise a
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* resolution which cannot be accurately measured by a float.
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*
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* @return the order of resolution or -1 if no timer is present.
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*/
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public static native int getTimerResolution();
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/**
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* Gets the current value of the hires timer, in seconds. When the Sys class is first loaded
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* the hires timer is reset to 0.0f. If no hires timer is present then this method will always
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* return whatever value the timer was last set to.
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*
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* Because the time is returned as a float, after a certain length of time the
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* hires timer can no longer represent time to the accuracy claimed by getTimerResolution().
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* Therefore the time is guaranteed only to be accurate for up to 100 seconds.
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* After 100 seconds has elapsed it is advisable to reset the timer. In reality
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* you should reset the timer every iteration of your game loop and simply use the
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* elapsed time for the iteration to increment your own, possibly more accurate
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* timers.
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*
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* @return the current hires time, in seconds.
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*/
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public static native float getTime();
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/**
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* Sets the hires timer to a new time. This time may be rounded by the available
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* hires timer resolution; if the hires timer resolution is 3, and you specify
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* a time of 0.0002f then the time will in fact be set to 0.0f.
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* @param time the new time, in seconds
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* @see #getTime()
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* @see #getTimerResolution()
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*/
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public static native void setTime(float time);
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/**
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* Set the process priority in a system independent way. Because of the various
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* differences in operating systems this might or might not have any effect or
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* the correct effect.
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*
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* The default process priority is NORMAL_PRIORITY.
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*
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* REALTIME_PRIORITY processes should theoretically be the maximum priority of
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* any process on the system and may have side effects on I/O and other fundamental
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* operating system functions - use with caution.
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*
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* It is unlikely that any games will want to change the priority of the Java
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* process; but there are some other applications for this library which require
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* process priority adjustments, such as in soft-realtime graphics rendering
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* for broadcast television.
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*
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* @param priority a priority class, which will be one of REALTIME_PRIORITY,
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* HIGH_PRIORITY, NORMAL_PRIORITY, or LOW_PRIORITY.
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*/
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public static native void setProcessPriority(int priority);
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}
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