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/**
* Copyright (c) 2003-2005 Sun Microsystems, Inc. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* -Redistribution of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* -Redistribution in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* Neither the name of Sun Microsystems, Inc. or the names of contributors may
* be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* This software is provided "AS IS," without a warranty of any kind.
* ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING
* ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR
* NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN MICROSYSTEMS, INC. ("SUN") AND ITS
* LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A
* RESULT OF USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES.
* IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT
* OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR
* PUNITIVE DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY,
* ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF SUN HAS
* BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
*
* You acknowledge that this software is not designed or intended for use in the
* design, construction, operation or maintenance of any nuclear facility.
*/
package com.jogamp.openal.impl;
import com.jogamp.common.os.DynamicLookupHelper;
import com.jogamp.common.os.NativeLibrary;
import java.lang.reflect.Field;
import com.jogamp.openal.*;
import com.jogamp.gluegen.runtime.*;
/** Helper class for managing OpenAL-related proc address tables. */
public class ALProcAddressLookup {
private static final ALProcAddressTable alTable;
private static final ALCProcAddressTable alcTable;
private static volatile boolean alTableInitialized = false;
private static volatile boolean alcTableInitialized = false;
private static final DynamicLookup lookup;
private static volatile NativeLibrary openAL;
static {
//workaround: map renamed fooImpl back to the real function name
FunctionAddressResolver resolver = new FunctionAddressResolver() {
public long resolve(String string, DynamicLookupHelper dlh) {
if (string.endsWith("Impl")) {
string = string.substring(0, string.length() - 4);
}
return dlh.dynamicLookupFunction(string);
}
};
alcTable = new ALCProcAddressTable(resolver);
alTable = new ALProcAddressTable();
lookup = new DynamicLookup();
}
static class DynamicLookup implements DynamicLookupHelper {
public long dynamicLookupFunction(String functionName) {
// At some point this may require an OpenAL context to be
// current as we will actually use alGetProcAddress. Since
// this routine is currently broken and there are no
// per-context function pointers anyway we could actually do
// this work anywhere.
if (openAL == null) {
// We choose not to search the system path first because we
// bundle a very recent version of OpenAL which we would like
// to override existing installations
openAL = NativeLibrary.open("OpenAL32", "openal", "OpenAL",
false,
ALProcAddressLookup.class.getClassLoader());
if (openAL == null) {
throw new RuntimeException("Unable to find and load OpenAL library");
}
}
return openAL.dynamicLookupFunction(functionName);
}
}
public static void resetALProcAddressTable() {
if (!alTableInitialized) {
synchronized (ALProcAddressLookup.class) {
if (!alTableInitialized) {
// At some point this may require an OpenAL context to be
// current as we will actually use alGetProcAddress. Since
// this routine is currently broken and there are no
// per-context function pointers anyway we could actually do
// this work anywhere. We should also in theory have
// per-ALcontext ALProcAddressTables and per-ALCdevice
// ALCProcAddressTables.
alTable.reset(lookup);
// The above only manages to find addresses for the core OpenAL
// functions. The below uses alGetProcAddress() to find the addresses
// of extensions such as EFX, just as in the C++ examples of the
// OpenAL 1.1 SDK.
useALGetProcAddress();
alTableInitialized = true;
}
}
}
}
public static void resetALCProcAddressTable() {
if (!alcTableInitialized) {
synchronized (ALProcAddressLookup.class) {
if (!alcTableInitialized) {
// At some point this may require an OpenAL device to be
// created as we will actually use alcGetProcAddress. Since
// this routine is currently broken and there are no
// per-device function pointers anyway we could actually do
// this work anywhere. We should also in theory have
// per-ALcontext ALProcAddressTables and per-ALCdevice
// ALCProcAddressTables.
alcTable.reset(lookup);
alcTableInitialized = true;
}
}
}
}
public static ALProcAddressTable getALProcAddressTable() {
return alTable;
}
public static ALCProcAddressTable getALCProcAddressTable() {
return alcTable;
}
/**
* Retrieves the values of the OpenAL functions using alGetProcAddress().
*/
private static void useALGetProcAddress() {
String addrOfPrefix = "_addressof_";
ALImpl al = (ALImpl) ALFactory.getAL();
Field[] fields = ALProcAddressTable.class.getFields();
for (int i = 0; i < fields.length; i++) {
Field field = fields[i];
// Skip non-address fields
String fieldname = field.getName();
if (!fieldname.startsWith(addrOfPrefix)) {
continue;
}
try {
String functionname = fieldname.substring(addrOfPrefix.length());
long fieldval = field.getLong(alTable);
// Skip fields which have already been valued
if (fieldval != 0) {
continue;
}
// Get the address
long procAddressVal = al.alGetProcAddress(functionname);
field.setLong(alTable, procAddressVal);
}
catch (Exception ex) {
throw new RuntimeException("Unable to repopulate ALProcAddressTable values", ex);
}
}
}
}
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