WebGLDeferredRenderer: updated DirectionalLights handling.

Full-screen light proxies need to turn off depth testing. Instead stencil buffer now takes care of not touching background pixels.

Also matched specular term compositing to point lights.

examples/js/ShaderDeferred.js

@@ -543,16 +543,7 @@ THREE.ShaderDeferred = {
 				// combine
 
 				"vec3 light = lightIntensity * lightColor;",
-
-				"#ifdef ADDITIVE_SPECULAR",
-
-					"gl_FragColor = vec4( albedo * light * diffuse, 1.0 ) + vec4( light * specular, 1.0 );",
-
-				"#else",
-
-					"gl_FragColor = vec4( albedo * light * ( diffuse + specular ), 1.0 );",
-
-				"#endif",
+				"gl_FragColor = vec4( albedo * light * diffuse, 1.0 ) + vec4( light * specular, 1.0 );",
 
 			"}"
 

examples/js/renderers/WebGLDeferredRenderer.js

@@ -348,6 +348,7 @@ THREE.WebGLDeferredRenderer = function ( parameters ) {
 
 			blending:		THREE.AdditiveBlending,
 			depthWrite:		false,
+			depthTest:		false,
 			transparent:	true
 
 		} );
@@ -593,7 +594,7 @@ THREE.WebGLDeferredRenderer = function ( parameters ) {
 		}
 
 		// still no touching shared depth buffer
-		// (write light proxy color pixel if in front of scene pixel)
+		// (write light proxy color pixel if behind scene pixel)
 
 		gl.depthFunc( gl.GEQUAL );