subd/split.h

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/* SPDX-FileCopyrightText: 2011-2022 Blender Foundation
 *
 * SPDX-License-Identifier: Apache-2.0 */
 
#ifndef __SUBD_SPLIT_H__
#define __SUBD_SPLIT_H__
 
/* DiagSplit: Parallel, Crack-free, Adaptive Tessellation for Micro-polygon Rendering
 * Splits up patches and determines edge tessellation factors for dicing. Patch
 * evaluation at arbitrary points is required for this to work. See the paper
 * for more details. */
 
#include "subd/dice.h"
#include "subd/subpatch.h"
 
#include "util/deque.h"
#include "util/types.h"
#include "util/vector.h"
 
#include <deque>
 
CCL_NAMESPACE_BEGIN
 
class Mesh;
class Patch;
 
class DiagSplit {
  SubdParams params;
 
  vector<Subpatch> subpatches;
  /* `deque` is used so that element pointers remain valid when size is changed. */
  deque<Edge> edges;
 
  float3 to_world(Patch *patch, float2 uv);
  int T(Patch *patch, float2 Pstart, float2 Pend, bool recursive_resolve = false);
 
  void limit_edge_factor(int &T, Patch *patch, float2 Pstart, float2 Pend);
  void resolve_edge_factors(Subpatch &sub);
 
  void partition_edge(
      Patch *patch, float2 *P, int *t0, int *t1, float2 Pstart, float2 Pend, int t);
 
  void split(Subpatch &sub, int depth = 0);
 
  int num_alloced_verts = 0;
  int alloc_verts(int n); /* Returns start index of new verts. */
 
 public:
  Edge *alloc_edge();
 
  explicit DiagSplit(const SubdParams &params);
 
  void split_patches(Patch *patches, size_t patches_byte_stride);
 
  void split_quad(const Mesh::SubdFace &face, Patch *patch);
  void split_ngon(const Mesh::SubdFace &face, Patch *patches, size_t patches_byte_stride);
 
  void post_split();
};
 
CCL_NAMESPACE_END
 
#endif /* __SUBD_SPLIT_H__ */