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* Copyright (c) 2002-2008 LWJGL Project
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* met:
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*
* * Redistributions in binary form must reproduce the above copyright
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* documentation and/or other materials provided with the distribution.
*
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* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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package org.lwjgl.openal;
import org.lwjgl.LWJGLException;
import org.lwjgl.LWJGLUtil;
import org.lwjgl.Sys;
/**
* <p>
* The AL class implements the actual creation code for linking to the native library
* OpenAL.
* </p>
*
* @author Brian Matzon <brian@matzon.dk>
* @version $Revision: 3418 $
* $Id: AL.java 3418 2010-09-28 21:11:35Z spasi $
*/
public final class AL {
/** ALCdevice instance. */
static ALCdevice device;
/** Current ALCcontext. */
static ALCcontext context;
/** Have we been created? */
private static boolean created;
static {
Sys.initialize();
}
private AL() {
}
/**
* Native method to create AL instance
*
* @param oalPath Path to search for OpenAL library
*/
private static native void nCreate(String oalPath) throws LWJGLException;
/**
* Native method to create AL instance from the Mac OS X 10.4 OpenAL framework.
* It is only defined in the Mac OS X native library.
*/
private static native void nCreateDefault() throws LWJGLException;
/**
* Native method the destroy the AL
*/
private static native void nDestroy();
/**
* @return true if AL has been created
*/
public static boolean isCreated() {
return created;
}
/**
* Creates an OpenAL instance. Using this constructor will cause OpenAL to
* open the device using supplied device argument, and create a context using the context values
* supplied.
*
* @param deviceArguments Arguments supplied to native device
* @param contextFrequency Frequency for mixing output buffer, in units of Hz (Common values include 11025, 22050, and 44100).
* @param contextRefresh Refresh intervalls, in units of Hz.
* @param contextSynchronized Flag, indicating a synchronous context.*
*/
public static void create(String deviceArguments, int contextFrequency, int contextRefresh, boolean contextSynchronized)
throws LWJGLException {
create(deviceArguments, contextFrequency, contextRefresh, contextSynchronized, true);
}
/**
* @param openDevice Whether to automatically open the device
* @see #create(String, int, int, boolean)
*/
public static void create(String deviceArguments, int contextFrequency, int contextRefresh, boolean contextSynchronized, boolean openDevice)
throws LWJGLException {
if (created)
throw new IllegalStateException("Only one OpenAL context may be instantiated at any one time.");
String libname;
String[] library_names;
switch (LWJGLUtil.getPlatform()) {
case LWJGLUtil.PLATFORM_WINDOWS:
libname = "OpenAL32";
library_names = new String[]{"OpenAL64.dll", "OpenAL32.dll"};
break;
case LWJGLUtil.PLATFORM_LINUX:
libname = "openal";
library_names = new String[]{"libopenal64.so", "libopenal.so", "libopenal.so.0"};
break;
case LWJGLUtil.PLATFORM_MACOSX:
libname = "openal";
library_names = new String[]{"openal.dylib"};
break;
default:
throw new LWJGLException("Unknown platform: " + LWJGLUtil.getPlatform());
}
String[] oalPaths = LWJGLUtil.getLibraryPaths(libname, library_names, AL.class.getClassLoader());
LWJGLUtil.log("Found " + oalPaths.length + " OpenAL paths");
for ( String oalPath : oalPaths ) {
try {
nCreate(oalPath);
created = true;
init(deviceArguments, contextFrequency, contextRefresh, contextSynchronized, openDevice);
break;
} catch (LWJGLException e) {
LWJGLUtil.log("Failed to load " + oalPath + ": " + e.getMessage());
}
}
if (!created && LWJGLUtil.getPlatform() == LWJGLUtil.PLATFORM_MACOSX) {
// Try to load OpenAL from the framework instead
nCreateDefault();
created = true;
init(deviceArguments, contextFrequency, contextRefresh, contextSynchronized, openDevice);
}
if (!created)
throw new LWJGLException("Could not locate OpenAL library.");
}
private static void init(String deviceArguments, int contextFrequency, int contextRefresh, boolean contextSynchronized, boolean openDevice) throws LWJGLException {
try {
AL10.initNativeStubs();
ALC10.initNativeStubs();
if(openDevice) {
device = ALC10.alcOpenDevice(deviceArguments);
if (device == null) {
throw new LWJGLException("Could not open ALC device");
}
if (contextFrequency == -1) {
context = ALC10.alcCreateContext(device, null);
} else {
context = ALC10.alcCreateContext(device,
ALCcontext.createAttributeList(contextFrequency, contextRefresh,
contextSynchronized ? ALC10.ALC_TRUE : ALC10.ALC_FALSE));
}
ALC10.alcMakeContextCurrent(context);
}
} catch (LWJGLException e) {
destroy();
throw e;
}
ALC11.initialize();
// Load EFX10 native stubs if ALC_EXT_EFX is supported.
// Is there any situation where the current device supports ALC_EXT_EFX and one
// later created by the user does not?
// Do we have to call resetNativeStubs(EFX10.class); somewhere? Not done for AL11
// either.
// This can either be here or in ALC11, since ALC_EXT_EFX indirectly requires AL 1.1
// for functions like alSource3i.
if (ALC10.alcIsExtensionPresent(device, EFX10.ALC_EXT_EFX_NAME)){
EFX10.initNativeStubs();
}
}
/**
* Creates an OpenAL instance. The empty create will cause OpenAL to
* open the default device, and create a context using default values.
* This method used to use default values that the OpenAL implementation
* chose but this produces unexpected results on some systems; so now
* it defaults to 44100Hz mixing @ 60Hz refresh.
*/
public static void create() throws LWJGLException {
create(null, 44100, 60, false);
}
/**
* Exit cleanly by calling destroy.
*/
public static void destroy() {
if (context != null) {
ALC10.alcMakeContextCurrent(null);
ALC10.alcDestroyContext(context);
context = null;
}
if (device != null) {
boolean result = ALC10.alcCloseDevice(device);
device = null;
}
resetNativeStubs(AL10.class);
resetNativeStubs(AL11.class);
resetNativeStubs(ALC10.class);
resetNativeStubs(ALC11.class);
resetNativeStubs(EFX10.class);
if (created)
nDestroy();
created = false;
}
private static native void resetNativeStubs(Class clazz);
/**
* @return handle to the default AL context.
*/
public static ALCcontext getContext() {
return context;
}
/**
* @return handle to the default AL device.
*/
public static ALCdevice getDevice() {
return device;
}
}