* Added IndexBuffer.wrapIndexBuffer() for wrapping any buffer (convenience method)

 * All index buffers now rewind the buffer before allowing any read/write ops

git-svn-id: https://jmonkeyengine.googlecode.com/svn/trunk@9493 75d07b2b-3a1a-0410-a2c5-0572b91ccdca

engine/src/core/com/jme3/scene/mesh/IndexBuffer.java

@@ -34,6 +34,9 @@ package com.jme3.scene.mesh;
 
 import com.jme3.util.BufferUtils;
 import java.nio.Buffer;
+import java.nio.ByteBuffer;
+import java.nio.IntBuffer;
+import java.nio.ShortBuffer;
 
 /**
  * <code>IndexBuffer</code> is an abstraction for integer index buffers,
@@ -44,6 +47,18 @@ import java.nio.Buffer;
  */
 public abstract class IndexBuffer {
     
+    public static IndexBuffer wrapIndexBuffer(Buffer buf) {
+        if (buf instanceof ByteBuffer) {
+            return new IndexByteBuffer((ByteBuffer) buf);
+        } else if (buf instanceof ShortBuffer) {
+            return new IndexShortBuffer((ShortBuffer) buf);
+        } else if (buf instanceof IntBuffer) {
+            return new IndexIntBuffer((IntBuffer) buf);
+        } else {
+            throw new UnsupportedOperationException("Index buffer type unsupported: "+ buf.getClass());
+        }
+    }
+    
     /**
      * Creates an index buffer that can contain the given amount
      * of vertices.

engine/src/core/com/jme3/scene/mesh/IndexByteBuffer.java

@@ -45,7 +45,8 @@ public class IndexByteBuffer extends IndexBuffer {
     private ByteBuffer buf;
 
     public IndexByteBuffer(ByteBuffer buffer) {
-        this.buf = buffer;
+        buf = buffer;
+        buf.rewind();
     }
     
     @Override

engine/src/core/com/jme3/scene/mesh/IndexIntBuffer.java

@@ -45,7 +45,8 @@ public class IndexIntBuffer extends IndexBuffer {
     private IntBuffer buf;
 
     public IndexIntBuffer(IntBuffer buffer) {
-        this.buf = buffer;
+        buf = buffer;
+        buf.rewind();
     }
 
     @Override

engine/src/core/com/jme3/scene/mesh/IndexShortBuffer.java

@@ -45,7 +45,8 @@ public class IndexShortBuffer extends IndexBuffer {
     private ShortBuffer buf;
 
     public IndexShortBuffer(ShortBuffer buffer) {
-        this.buf = buffer;
+        buf = buffer;
+        buf.rewind();
     }
 
     @Override