blender/intern/cycles/subd/subd_patch.h

/*
 * 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.
 */

#ifndef __SUBD_PATCH_H__
#define __SUBD_PATCH_H__

#include "util/util_boundbox.h"
#include "util/util_types.h"

CCL_NAMESPACE_BEGIN

class Patch {
 public:
  virtual ~Patch()
  {
  }
  virtual void eval(float3 *P, float3 *dPdu, float3 *dPdv, float3 *N, float u, float v) = 0;
  virtual BoundBox bound() = 0;
  virtual int ptex_face_id()
  {
    return -1;
  }

  int patch_index;
  int shader;
};

/* Linear Quad Patch */

class LinearQuadPatch : public Patch {
 public:
  float3 hull[4];
  float3 normals[4];

  void eval(float3 *P, float3 *dPdu, float3 *dPdv, float3 *N, float u, float v);
  BoundBox bound();
};

/* Bicubic Patch */

class BicubicPatch : public Patch {
 public:
  float3 hull[16];

  void eval(float3 *P, float3 *dPdu, float3 *dPdv, float3 *N, float u, float v);
  BoundBox bound();
};

CCL_NAMESPACE_END

#endif /* __SUBD_PATCH_H__ */