BKE_subdiv_eval.hh

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/* SPDX-FileCopyrightText: 2018 Blender Authors
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */

 
#pragma once
 
#include "BLI_math_vector_types.hh"
#include "BLI_span.hh"
 
struct Mesh;
struct OpenSubdiv_EvaluatorCache;
struct OpenSubdiv_EvaluatorSettings;
 
namespace blender::bke::subdiv {
 
struct Subdiv;
 
enum eSubdivEvaluatorType {
  SUBDIV_EVALUATOR_TYPE_CPU,
  SUBDIV_EVALUATOR_TYPE_GPU,
};

bool eval_begin(Subdiv *subdiv,
                eSubdivEvaluatorType evaluator_type,
                OpenSubdiv_EvaluatorCache *evaluator_cache,
                const OpenSubdiv_EvaluatorSettings *settings);

bool eval_begin_from_mesh(Subdiv *subdiv,
                          const Mesh *mesh,
                          eSubdivEvaluatorType evaluator_type,
                          Span<float3> coarse_vert_positions = {},
                          OpenSubdiv_EvaluatorCache *evaluator_cache = nullptr);
bool eval_refine_from_mesh(Subdiv *subdiv, const Mesh *mesh, Span<float3> coarse_vert_positions);

void eval_init_displacement(Subdiv *subdiv);
 
/* Single point queries. */
 
/* Evaluate point at a limit surface, with optional derivatives and normal. */
 
float3 eval_limit_point(Subdiv *subdiv, int ptex_face_index, float u, float v);
void eval_limit_point_and_derivatives(Subdiv *subdiv,
                                      int ptex_face_index,
                                      float u,
                                      float v,
                                      float3 &r_P,
                                      float3 &r_dPdu,
                                      float3 &r_dPdv);
void eval_limit_point_and_normal(
    Subdiv *subdiv, int ptex_face_index, float u, float v, float3 &r_P, float3 &r_N);

void eval_vertex_data(
    Subdiv *subdiv, int ptex_face_index, float u, float v, float r_vertex_data[]);

void eval_face_varying(Subdiv *subdiv,
                       int face_varying_channel,
                       int ptex_face_index,
                       float u,
                       float v,
                       float2 &r_face_varying);

void eval_displacement(Subdiv *subdiv,
                       int ptex_face_index,
                       float u,
                       float v,
                       const float3 &dPdu,
                       const float3 &dPdv,
                       float3 &r_D);

float3 eval_final_point(Subdiv *subdiv, int ptex_face_index, float u, float v);
 
}  // namespace blender::bke::subdiv