dice.h

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/* SPDX-FileCopyrightText: 2011-2022 Blender Foundation
 *
 * SPDX-License-Identifier: Apache-2.0 */
 
#ifndef __SUBD_DICE_H__
#define __SUBD_DICE_H__
 
/* DX11 like EdgeDice implementation, with different tessellation factors for
 * each edge for watertight tessellation, with subpatch remapping to work with
 * DiagSplit. For more algorithm details, see the DiagSplit paper or the
 * ARB_tessellation_shader OpenGL extension, Section 2.X.2. */
 
#include "util/types.h"
#include "util/vector.h"
 
#include "subd/subpatch.h"
 
CCL_NAMESPACE_BEGIN
 
class Camera;
class Mesh;
class Patch;
 
struct SubdParams {
  Mesh *mesh;
  bool ptex;
 
  int test_steps;
  int split_threshold;
  float dicing_rate;
  int max_level;
  Camera *camera;
  Transform objecttoworld;
 
  SubdParams(Mesh *mesh_, bool ptex_ = false)
  {
    mesh = mesh_;
    ptex = ptex_;
 
    test_steps = 3;
    split_threshold = 1;
    dicing_rate = 1.0f;
    max_level = 12;
    camera = NULL;
  }
};
 
/* EdgeDice Base */
 
class EdgeDice {
 public:
  SubdParams params;
  float3 *mesh_P;
  float3 *mesh_N;
  size_t vert_offset;
  size_t tri_offset;
 
  explicit EdgeDice(const SubdParams &params);
 
  void reserve(int num_verts, int num_triangles);
 
  void set_vert(Patch *patch, int index, float2 uv);
  void add_triangle(Patch *patch, int v0, int v1, int v2);
 
  void stitch_triangles(Subpatch &sub, int edge);
};
 
/* Quad EdgeDice */
 
class QuadDice : public EdgeDice {
 public:
  explicit QuadDice(const SubdParams &params);
 
  float3 eval_projected(Subpatch &sub, float u, float v);
 
  float2 map_uv(Subpatch &sub, float u, float v);
  void set_vert(Subpatch &sub, int index, float u, float v);
 
  void add_grid(Subpatch &sub, int Mu, int Mv, int offset);
 
  void set_side(Subpatch &sub, int edge);
 
  float quad_area(const float3 &a, const float3 &b, const float3 &c, const float3 &d);
  float scale_factor(Subpatch &sub, int Mu, int Mv);
 
  void dice(Subpatch &sub);
};
 
CCL_NAMESPACE_END
 
#endif /* __SUBD_DICE_H__ */