To reduce shader state changes and compilations, just use the

four-bone-per-vertex configuration for all skinned meshes.  Depending on 
the models we have, it may be worth compiling a separate one for two 
bones per vertex.  Added a hook to customize the material color (for 
per-vertex colors, e.g.)


git-svn-id: svn+ssh://src.earth.threerings.net/nenya/trunk@245 ed5b42cb-e716-0410-a449-f6a68f950b19

src/java/com/threerings/jme/util/ShaderConfig.java

@@ -240,12 +240,8 @@ public abstract class ShaderConfig
 
             // add snippets for each of the lights
             for (int ii = 0; ii < _lights.length; ii++) {
-                LightConfig light = _lights[ii];
-                if (light.type == Light.LT_POINT) {
-                    buf.append(POINT_LIGHT_SNIPPET.replace("%", Integer.toString(ii)));
-                } else if (light.type == Light.LT_DIRECTIONAL) {
-                    buf.append(DIRECTIONAL_LIGHT_SNIPPET.replace("%", Integer.toString(ii)));
-                }
+                String snippet = getLightSnippet(_lights[ii].type);
+                buf.append(snippet.replace("%", Integer.toString(ii)));
             }
 
             // the alpha value comes from the diffuse color in the material
@@ -281,6 +277,21 @@ public abstract class ShaderConfig
         ddefs.add(buf.toString());
     }
 
+    /**
+     * Returns a code snippet that adds the influence of a light of the specified type (after
+     * replacing '%' with the light index).
+     */
+    protected String getLightSnippet (int type)
+    {
+        if (type == Light.LT_POINT) {
+            return POINT_LIGHT_SNIPPET;
+        } else if (type == Light.LT_DIRECTIONAL) {
+            return DIRECTIONAL_LIGHT_SNIPPET;
+        } else {
+            return "";
+        }
+    }
+
     /** The configuration of a single light in a {@link LightState}. */
     protected static class LightConfig
         implements Cloneable