patch.h

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/* SPDX-FileCopyrightText: 2011-2022 Blender Foundation
 *
 * SPDX-License-Identifier: Apache-2.0 */
 
#pragma once
 
#include "util/boundbox.h"
#include "util/types.h"
 
CCL_NAMESPACE_BEGIN
 
class Patch {
 public:
  Patch() = default;
  virtual ~Patch() = default;
 
  virtual void eval(
      float3 *P, float3 *dPdu, float3 *dPdv, float3 *N, const float u, float v) const = 0;
 
  int patch_index = 0;
  int shader = 0;
  bool smooth = true;
  bool from_ngon = false;
};
 
/* Linear Quad Patch */
 
class LinearQuadPatch final : public Patch {
 public:
  float3 hull[4];
 
  void eval(
      float3 *P, float3 *dPdu, float3 *dPdv, float3 *N, const float u, float v) const override;
  BoundBox bound();
};
 
/* Bicubic Patch */
 
class BicubicPatch final : public Patch {
 public:
  float3 hull[16];
 
  void eval(
      float3 *P, float3 *dPdu, float3 *dPdv, float3 *N, const float u, float v) const override;
  BoundBox bound();
};
 
CCL_NAMESPACE_END