o3d-webgl: Adjusting Sampler to throw an error if client attempts to use BORD...

samples/o3d-webgl/sampler.js

 /*
  * Copyright 2010, Google Inc.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 162 matching lines @@
     case o3d.Sampler.WRAP:
       gl_mode = this.gl.REPEAT;
       break;
     case o3d.Sampler.MIRROR:
       gl_mode = this.gl.MIRRORED_REPEAT;
       break;
     case o3d.Sampler.CLAMP:
       gl_mode = this.gl.CLAMP_TO_EDGE;
       break;
     case o3d.Sampler.BORDER:
-      gl_mode = this.gl.CLAMP_TO_BORDER;
-      break;
+      // This is not supported in WebGL.
     default:
-      this.gl.client.error_callback("Unknown Address mode");
+      this.gl.client.error_callback("Unknown/Unavailable Address mode");
       break;
   }
   return gl_mode;
 }
 
 
 /**
  * Converts the min filter mode of the sampler from an o3d constant to a webgl
  * constant.
  * @param {!o3d.Sampler.FilterType} o3d_filter, the O3D filter.
@@ skipping 80 matching lines @@
   if (currentTexture.levels == 1) {
     mip_filter = o3d.Sampler.NONE;
   }
   currentTexture.bindAndSetParameters_(
     this.convertAddressMode_(this.addressModeU),
     this.convertAddressMode_(this.addressModeV),
     this.convertMinFilter_(this.minFilter, mip_filter),
     this.convertMagFilter_(this.magFilter));
 }