1 files changed, 32 insertions, 0 deletions
diff --git a/src/net/java/games/jogl/impl/GLDrawableFactoryImpl.java b/src/net/java/games/jogl/impl/GLDrawableFactoryImpl.java
index be246db4e..b8c6a126c 100755
--- a/src/net/java/games/jogl/impl/GLDrawableFactoryImpl.java
+++ b/src/net/java/games/jogl/impl/GLDrawableFactoryImpl.java
@@ -42,6 +42,7 @@ package net.java.games.jogl.impl;
 import java.awt.Component;
 import java.awt.GraphicsConfiguration;
 import java.awt.GraphicsDevice;
+import net.java.games.gluegen.runtime.*; // for PROCADDRESS_VAR_PREFIX
 import net.java.games.jogl.*;
 
 /** Extends GLDrawableFactory with a few methods for handling
@@ -56,6 +57,37 @@ public abstract class GLDrawableFactoryImpl extends GLDrawableFactory {
   public abstract GLDrawableImpl createOffscreenDrawable(GLCapabilities capabilities,
                                                          GLCapabilitiesChooser chooser);
 
+  /** Helper routine which resets a ProcAddressTable generated by the
+      GLEmitter by looking up anew all of its function pointers. */
+  public void resetProcAddressTable(Object table) {
+    Class tableClass = table.getClass();
+    java.lang.reflect.Field[] fields = tableClass.getDeclaredFields();
+    
+    for (int i = 0; i < fields.length; ++i) {
+      String addressFieldName = fields[i].getName();
+      if (!addressFieldName.startsWith(ProcAddressHelper.PROCADDRESS_VAR_PREFIX)) {
+        // not a proc address variable
+        continue;
+      }
+      int startOfMethodName = ProcAddressHelper.PROCADDRESS_VAR_PREFIX.length();
+      String glFuncName = addressFieldName.substring(startOfMethodName);
+      try {
+        java.lang.reflect.Field addressField = tableClass.getDeclaredField(addressFieldName);
+        assert(addressField.getType() == Long.TYPE);
+        long newProcAddress = dynamicLookupFunction(glFuncName);
+        // set the current value of the proc address variable in the table object
+        addressField.setLong(table, newProcAddress); 
+      } catch (Exception e) {
+        throw new GLException("Cannot get GL proc address for method \"" +
+                              glFuncName + "\": Couldn't set value of field \"" + addressFieldName +
+                              "\" in class " + tableClass.getName(), e);
+      }
+    }
+  }
+
+  /** Dynamically looks up the given function. */
+  public abstract long dynamicLookupFunction(String glFuncName);
+
   public static GLDrawableFactoryImpl getFactoryImpl() {
     return (GLDrawableFactoryImpl) getFactory();
   }