Fixed bug where shadowmap shaders didn't compile on windows.

samples/shadow-map.html

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@@ skipping 495 matching lines @@
     return output;
   }
 
   /**
    * The pixel shader returns a shade of gray.  The lighter the shade the
    * farther that fragment is from the light.
    */
   float4 pixelShaderFunction(PixelShaderInput input): COLOR {
     // Pixels in the shadowmap store the pixel depth from the light's
     // perspective in normalized device coordinates.
-    return float4(input.depth.x / input.depth.y);
+    float t = input.depth.x / input.depth.y;
+    return float4(t, t, t, 1);
   }
 
   // #o3d VertexShaderEntryPoint vertexShaderFunction
   // #o3d PixelShaderEntryPoint pixelShaderFunction
   // #o3d MatrixLoadOrder RowMajor
 </script>
 
 
 <script id="shadowColorShader" type="text/O3DShader">
   /**
@@ skipping 91 matching lines @@
 <h1>Shadow Maps</h1>
 This sample implements a basic shadow map.
 <br/>
 <!-- Start of O3D plugin -->
 <div id="o3d" style="width: 600px; height: 600px;"></div>
 <!-- End of O3D plugin -->
 Use A, S, D, W, I and O to move the light.
 Press spacebar to see the shadow map.
 </body>
 </html>