From 3d36ce1bac06911920714bd3e801002c0f533f68 Mon Sep 17 00:00:00 2001
From: kbr <kbr@dev.java.net>
Date: Fri, 29 Jun 2007 00:15:57 +0000
Subject: Incorporated changes from Ultraq on javagaming.org forums for
 properly looking up EFX entry points

git-svn-id: file:///home/mbien/NetBeansProjects/JOGAMP/joal-sync/git-svn/../svn-server-sync/joal/trunk@557 03bf7f67-59de-4072-a415-9a990d468a3f
---
 .../java/games/joal/impl/ALProcAddressLookup.java  | 45 ++++++++++++++++++++++
 1 file changed, 45 insertions(+)

diff --git a/src/java/net/java/games/joal/impl/ALProcAddressLookup.java b/src/java/net/java/games/joal/impl/ALProcAddressLookup.java
index 5a188c7..c7bdc53 100755
--- a/src/java/net/java/games/joal/impl/ALProcAddressLookup.java
+++ b/src/java/net/java/games/joal/impl/ALProcAddressLookup.java
@@ -33,6 +33,8 @@
 
 package net.java.games.joal.impl;
 
+import java.lang.reflect.Field;
+
 import net.java.games.joal.*;
 import com.sun.gluegen.runtime.*;
 
@@ -80,6 +82,13 @@ public class ALProcAddressLookup {
           // per-ALcontext ALProcAddressTables and per-ALCdevice
           // ALCProcAddressTables.
           ProcAddressHelper.resetProcAddressTable(alTable, 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;
         }
       }
@@ -111,4 +120,40 @@ public class ALProcAddressLookup {
   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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