Added option to depth-sort the triangles in transparent meshes. I tried

to optimize this, and seems reasonably fast, but not fast enough to 
enable it for all transparent meshes.  Hopefully the artists can improve 
performance by merging meshes together, and we can strike a happy 
balance between sorting by mesh and sorting by triangles.


git-svn-id: svn+ssh://src.earth.threerings.net/nenya/trunk@29 ed5b42cb-e716-0410-a449-f6a68f950b19

src/java/com/threerings/jme/model/SkinMesh.java

@@ -175,20 +175,10 @@ public class SkinMesh extends ModelMesh
     {
         super.reconstruct(vertices, normals, colors, textures, indices);
         
-        // store the current buffers as the originals
-        storeOriginalBuffers();
-        
         // initialize the quantized frame table
         _frames = new HashIntMap<Object>();
     }
     
-    @Override // documentation inherited
-    public void centerVertices ()
-    {
-        super.centerVertices();
-        storeOriginalBuffers();
-    }
-    
     @Override // documentation inherited
     public Spatial putClone (Spatial store, Model.CloneCreator properties)
     {
@@ -279,10 +269,10 @@ public class SkinMesh extends ModelMesh
             VBOInfo vboinfo = new VBOInfo(false);
             vboinfo.setVBOColorEnabled(true);
             vboinfo.setVBOTextureEnabled(true);
-            vboinfo.setVBOIndexEnabled(true);
+            vboinfo.setVBOIndexEnabled(!_depthSorted);
             setVBOInfo(vboinfo);
         }
-        _useDisplayLists = useDisplayLists;
+        _useDisplayLists = useDisplayLists && !_depthSorted;
     }
     
     @Override // documentation inherited
@@ -410,7 +400,7 @@ public class SkinMesh extends ModelMesh
             VBOInfo ovboinfo = batch.getVBOInfo();
             if (ovboinfo != null) {
                 VBOInfo vboinfo = new VBOInfo(true);
-                vboinfo.setVBOIndexEnabled(true);
+                vboinfo.setVBOIndexEnabled(!_depthSorted);
                 vboinfo.setVBOColorID(ovboinfo.getVBOColorID());
                 for (int ii = 0; ii < nunits; ii++) {
                     vboinfo.setVBOTextureID(ii, ovboinfo.getVBOTextureID(ii));
@@ -425,11 +415,11 @@ public class SkinMesh extends ModelMesh
         }
     }
     
-    /**
-     * Stores the current vertex and normal buffers for later deformation.
-     */
+    @Override // documentation inherited
     protected void storeOriginalBuffers ()
     {
+        super.storeOriginalBuffers();
+        
         FloatBuffer vbuf = getVertexBuffer(0), nbuf = getNormalBuffer(0);
         vbuf.rewind();
         nbuf.rewind();
@@ -483,7 +473,7 @@ public class SkinMesh extends ModelMesh
     
     /** The original (undeformed) vertex and normal buffers and the deformed
      * versions. */
-    protected float[] _ovbuf, _onbuf, _vbuf, _nbuf;
+    protected float[] _onbuf, _ovbuf, _nbuf;
 
     /** The frame id to store on the next update.  If 0, don't store any frame
      * and skin the mesh as normal.  If -1, a frame has been stored and thus