191 lines
5.6 KiB
Java
191 lines
5.6 KiB
Java
/*
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* Copyright (c) 2002 Lightweight Java Game Library Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* * Neither the name of 'Light Weight Java Game Library' nor the names of
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* its contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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package org.lwjgl.openal;
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import java.io.File;
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import java.util.StringTokenizer;
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import java.lang.reflect.Method;
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import org.lwjgl.Sys;
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/**
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* $Id$
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* <br>
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* The base AL functionality (no actual AL methods).
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*
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* This has been provided as a base class that we can use for either the
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* full AL 1.0 specification or as a cut-down OpenAL embedded spec. (aka
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* a mini-driver).
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*
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* @author Brian Matzon <brian@matzon.dk>
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* @version $Revision$
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*/
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public abstract class BaseAL {
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/** Have we been created? */
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protected static boolean created;
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static {
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initialize();
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}
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/**
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* Override to provide any initialization code after creation.
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*/
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protected static void init() throws OpenALException {
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}
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/**
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* Static initialization
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*/
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private static void initialize() {
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System.loadLibrary(org.lwjgl.Sys.getLibraryName());
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}
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/**
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* Creates the AL instance
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*
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* @throws Exception if a failiure occured in the AL creation process
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*/
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public static void create() throws OpenALException {
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if (created) {
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return;
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}
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// need to pass path of possible locations of OAL to native side
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String libpath = System.getProperty("java.library.path");
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String seperator = System.getProperty("path.separator");
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String libname;
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// libname is hardcoded atm - this will change in a near future...
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libname =
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(System.getProperty("os.name").toLowerCase().indexOf("windows") == -1)
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? "libopenal.so"
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: "lwjglaudio.dll";
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// try to get path from JWS (if possible)
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String jwsLibname =
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(System.getProperty("os.name").toLowerCase().indexOf("windows") == -1)
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? "openal"
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: "lwjglaudio";
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String jwsPath = getPathFromJWS(jwsLibname);
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if (jwsPath != null) {
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libpath += seperator
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+ jwsPath.substring(0, jwsPath.lastIndexOf(File.separator));
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}
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StringTokenizer st = new StringTokenizer(libpath, seperator);
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//create needed string array
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String[] oalPaths = new String[st.countTokens() + 1];
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//build paths
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for (int i = 0; i < oalPaths.length - 1; i++) {
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oalPaths[i] = st.nextToken() + File.separator + libname;
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}
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//add cwd path
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oalPaths[oalPaths.length - 1] = libname;
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if (!nCreate(oalPaths)) {
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throw new OpenALException("AL instance could not be created.");
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}
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init();
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created = true;
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}
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/**
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* Tries to locate OpenAL from the JWS Library path
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* This method exists because OpenAL is loaded from native code, and as such
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* is exempt from JWS library loading rutines. OpenAL therefore always fails.
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* We therefore invoke the protected method of the JWS classloader to see if it can
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* locate it.
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*
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* @param libname Name of library to search for
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* @return Absolute path to library if found, otherwise null
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*/
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private static String getPathFromJWS(String libname) {
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try {
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if(Sys.DEBUG) {
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System.out.println("JWS Classloader looking for: " + libname);
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}
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Object o = BaseAL.class.getClassLoader();
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Class c = o.getClass();
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Method findLibrary =
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c.getMethod("findLibrary", new Class[] { String.class });
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Object[] arguments = new Object[] { libname };
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return (String) findLibrary.invoke(o, arguments);
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} catch (Exception e) {
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if(Sys.DEBUG) {
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System.out.println("Failure locating OpenAL using classloader:");
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e.printStackTrace();
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}
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}
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return null;
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}
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/**
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* Native method to create AL instance
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*
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* @param oalPaths Array of strings containing paths to search for OpenAL library
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* @return true if the AL creation process succeeded
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*/
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protected static native boolean nCreate(String[] oalPaths);
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/**
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* Calls whatever destruction rutines that are needed
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*/
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public static void destroy() {
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if (!created) {
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return;
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}
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created = false;
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nDestroy();
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}
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/**
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* Native method the destroy the AL
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*/
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protected static native void nDestroy();
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/**
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* @return true if AL has been created
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*/
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public static boolean isCreated() {
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return created;
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}
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}
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