Cycles: experimental OSL ptex reading code.

This code can't actually be enabled for building and is incomplete, but it's
here because we know we want to support this at some point and there's not much
reason to have it in a separate branch if a simple #ifdef can disable it.

intern/cycles/render/nodes.h

@@ -66,6 +66,7 @@ public:
 	SHADER_NODE_NO_CLONE_CLASS(ImageTextureNode)
 	~ImageTextureNode();
 	ShaderNode *clone() const;
+	void attributes(AttributeRequestSet *attributes);
 
 	ImageManager *image_manager;
 	int slot;
@@ -87,6 +88,7 @@ public:
 	SHADER_NODE_NO_CLONE_CLASS(EnvironmentTextureNode)
 	~EnvironmentTextureNode();
 	ShaderNode *clone() const;
+	void attributes(AttributeRequestSet *attributes);
 
 	ImageManager *image_manager;
 	int slot;