/*
 * Copyright 2011-2013 Blender Foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "stdcycles.h"

shader node_attribute(string bump_offset = "center",
                      string name = "",
                      output point Vector = point(0.0, 0.0, 0.0),
                      output color Color = 0.0,
                      output float Fac = 0.0,
                      output float Alpha = 0.0)
{
  float data[4] = {0.0, 0.0, 0.0, 0.0};
  getattribute(name, data);
  Color = color(data[0], data[1], data[2]);
  Vector = point(Color);
  getattribute(name, Fac);
  Alpha = data[3];

  if (bump_offset == "dx") {
    Color += Dx(Color);
    Vector += Dx(Vector);
    Fac += Dx(Fac);
    Alpha += Dx(Alpha);
  }
  else if (bump_offset == "dy") {
    Color += Dy(Color);
    Vector += Dy(Vector);
    Fac += Dy(Fac);
    Alpha += Dy(Alpha);
  }
}