subd_patch.h

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/*
 * 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:
  Patch() : patch_index(0), shader(0), from_ngon(false)
  {
  }
 
  virtual ~Patch() = default;
 
  virtual void eval(float3 *P, float3 *dPdu, float3 *dPdv, float3 *N, float u, float v) = 0;
 
  int patch_index;
  int shader;
  bool from_ngon;
};
 
/* 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__ */