232 lines
7.3 KiB
Java
232 lines
7.3 KiB
Java
/*
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* Copyright (c) 2002-2008 LWJGL 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 'LWJGL' 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 org.lwjgl.LWJGLException;
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import org.lwjgl.LWJGLUtil;
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import org.lwjgl.Sys;
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/**
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* <p>
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* The AL class implements the actual creation code for linking to the native library
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* OpenAL.
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* </p>
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*
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* @author Brian Matzon <brian@matzon.dk>
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* @version $Revision$
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* $Id$
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*/
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public final class AL {
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/** ALCdevice instance. */
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protected static ALCdevice device;
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/** Current ALCcontext. */
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protected static ALCcontext context;
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/** Have we been created? */
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private static boolean created;
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static {
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Sys.initialize();
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}
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private AL() {
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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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*/
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private static native void nCreate(String oalPath) throws LWJGLException;
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/**
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* Native method to create AL instance from the Mac OS X 10.4 OpenAL framework.
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* It is only defined in the Mac OS X native library.
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*
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* @param oalPaths Array of strings containing paths to search for OpenAL library
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*/
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private static native void nCreateDefault() throws LWJGLException;
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/**
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* Native method the destroy the AL
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*/
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private 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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* Creates an OpenAL instance. Using this constructor will cause OpenAL to
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* open the device using supplied device argument, and create a context using the context values
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* supplied.
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*
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* @param deviceArguments Arguments supplied to native device
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* @param contextFrequency Frequency for mixing output buffer, in units of Hz (Common values include 11025, 22050, and 44100).
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* @param contextRefresh Refresh intervalls, in units of Hz.
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* @param contextSynchronized Flag, indicating a synchronous context.*
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*/
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public static void create(String deviceArguments, int contextFrequency, int contextRefresh, boolean contextSynchronized)
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throws LWJGLException {
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create(deviceArguments, contextFrequency, contextRefresh, contextSynchronized, true);
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}
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/**
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* @param openDevice Whether to automatically open the device
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* @see #create(String, int, int, boolean)
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*/
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public static void create(String deviceArguments, int contextFrequency, int contextRefresh, boolean contextSynchronized, boolean openDevice)
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throws LWJGLException {
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if (created)
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throw new IllegalStateException("Only one OpenAL context may be instantiated at any one time.");
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String libname;
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String[] library_names;
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switch (LWJGLUtil.getPlatform()) {
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case LWJGLUtil.PLATFORM_WINDOWS:
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libname = "OpenAL32";
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library_names = new String[]{"OpenAL32.dll"};
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break;
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case LWJGLUtil.PLATFORM_LINUX:
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libname = "openal";
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library_names = new String[]{"libopenal64.so", "libopenal.so", "libopenal.so.0"};
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break;
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case LWJGLUtil.PLATFORM_MACOSX:
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libname = "openal";
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library_names = new String[]{"openal.dylib"};
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break;
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default:
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throw new LWJGLException("Unknown platform: " + LWJGLUtil.getPlatform());
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}
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String[] oalPaths = LWJGLUtil.getLibraryPaths(libname, library_names, AL.class.getClassLoader());
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LWJGLUtil.log("Found " + oalPaths.length + " OpenAL paths");
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for (int i = 0; i < oalPaths.length; i++) {
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try {
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nCreate(oalPaths[i]);
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created = true;
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init(deviceArguments, contextFrequency, contextRefresh, contextSynchronized, openDevice);
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break;
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} catch (LWJGLException e) {
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LWJGLUtil.log("Failed to load " + oalPaths[i] + ": " + e.getMessage());
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}
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}
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if (!created && LWJGLUtil.getPlatform() == LWJGLUtil.PLATFORM_MACOSX) {
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// Try to load OpenAL from the framework instead
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nCreateDefault();
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created = true;
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init(deviceArguments, contextFrequency, contextRefresh, contextSynchronized, openDevice);
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}
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if (!created)
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throw new LWJGLException("Could not locate OpenAL library.");
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}
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private static void init(String deviceArguments, int contextFrequency, int contextRefresh, boolean contextSynchronized, boolean openDevice) throws LWJGLException {
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try {
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AL10.initNativeStubs();
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ALC10.initNativeStubs();
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if(openDevice) {
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device = ALC10.alcOpenDevice(deviceArguments);
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if (device == null)
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throw new LWJGLException("Could not open ALC device");
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if (contextFrequency == -1) {
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context = ALC10.alcCreateContext(device, null);
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} else {
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context = ALC10.alcCreateContext(device,
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ALCcontext.createAttributeList(contextFrequency, contextRefresh,
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contextSynchronized ? ALC10.ALC_TRUE : ALC10.ALC_FALSE));
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}
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ALC10.alcMakeContextCurrent(context);
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}
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} catch (LWJGLException e) {
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destroy();
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throw e;
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}
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ALC11.initialize();
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}
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/**
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* Creates an OpenAL instance. The empty create will cause OpenAL to
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* open the default device, and create a context using default values.
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* This method used to use default values that the OpenAL implementation
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* chose but this produces unexpected results on some systems; so now
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* it defaults to 44100Hz mixing @ 60Hz refresh.
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*/
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public static void create() throws LWJGLException {
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create(null, 44100, 60, false);
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}
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/**
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* Exit cleanly by calling destroy.
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*/
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public static void destroy() {
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if (context != null) {
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ALC10.alcMakeContextCurrent(null);
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ALC10.alcDestroyContext(context);
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context = null;
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}
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if (device != null) {
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boolean result = ALC10.alcCloseDevice(device);
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device = null;
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}
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resetNativeStubs(AL10.class);
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resetNativeStubs(ALC10.class);
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resetNativeStubs(ALC11.class);
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if (created)
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nDestroy();
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created = false;
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}
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private static native void resetNativeStubs(Class clazz);
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/**
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* @return handle to the default AL context.
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*/
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public static ALCcontext getContext() {
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return context;
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}
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/**
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* @return handle to the default AL device.
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*/
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public static ALCdevice getDevice() {
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return device;
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}
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}
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