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/* SPDX-License-Identifier: GPL-2.0-or-later
* Copyright 2018 Blender Foundation. All rights reserved. */
/** \file
* \ingroup bke
*/
#pragma once
#include "BLI_sys_types.h"
#ifdef __cplusplus
extern "C" {
#endif
struct Mesh;
struct OpenSubdiv_EvaluatorCache;
struct OpenSubdiv_EvaluatorSettings;
struct Subdiv;
typedef enum eSubdivEvaluatorType {
SUBDIV_EVALUATOR_TYPE_CPU,
SUBDIV_EVALUATOR_TYPE_GLSL_COMPUTE,
} eSubdivEvaluatorType;
/* Returns true if evaluator is ready for use. */
bool BKE_subdiv_eval_begin(struct Subdiv *subdiv,
eSubdivEvaluatorType evaluator_type,
struct OpenSubdiv_EvaluatorCache *evaluator_cache,
const struct OpenSubdiv_EvaluatorSettings *settings);
/* coarse_vertex_cos is an optional argument which allows to override coordinates of the coarse
* mesh. */
bool BKE_subdiv_eval_begin_from_mesh(struct Subdiv *subdiv,
const struct Mesh *mesh,
const float (*coarse_vertex_cos)[3],
eSubdivEvaluatorType evaluator_type,
struct OpenSubdiv_EvaluatorCache *evaluator_cache);
bool BKE_subdiv_eval_refine_from_mesh(struct Subdiv *subdiv,
const struct Mesh *mesh,
const float (*coarse_vertex_cos)[3]);
/* Makes sure displacement evaluator is initialized.
*
* NOTE: This function must be called once before evaluating displacement or
* final surface position. */
void BKE_subdiv_eval_init_displacement(struct Subdiv *subdiv);
/* Single point queries. */
/* Evaluate point at a limit surface, with optional derivatives and normal. */
void BKE_subdiv_eval_limit_point(
struct Subdiv *subdiv, int ptex_face_index, float u, float v, float r_P[3]);
void BKE_subdiv_eval_limit_point_and_derivatives(struct Subdiv *subdiv,
int ptex_face_index,
float u,
float v,
float r_P[3],
float r_dPdu[3],
float r_dPdv[3]);
void BKE_subdiv_eval_limit_point_and_normal(
struct Subdiv *subdiv, int ptex_face_index, float u, float v, float r_P[3], float r_N[3]);
/* Evaluate smoothly interpolated vertex data (such as ORCO). */
void BKE_subdiv_eval_vertex_data(struct Subdiv *subdiv,
const int ptex_face_index,
const float u,
const float v,
float r_vertex_data[]);
/* Evaluate face-varying layer (such as UV). */
void BKE_subdiv_eval_face_varying(struct Subdiv *subdiv,
int face_varying_channel,
int ptex_face_index,
float u,
float v,
float r_face_varying[2]);
/* NOTE: Expects derivatives to be correct.
*
* TODO(sergey): This is currently used together with
* BKE_subdiv_eval_final_point() which can easily evaluate derivatives.
* Would be nice to have displacement evaluation function which does not require
* knowing derivatives ahead of a time. */
void BKE_subdiv_eval_displacement(struct Subdiv *subdiv,
int ptex_face_index,
float u,
float v,
const float dPdu[3],
const float dPdv[3],
float r_D[3]);
/* Evaluate point on a limit surface with displacement applied to it. */
void BKE_subdiv_eval_final_point(
struct Subdiv *subdiv, int ptex_face_index, float u, float v, float r_P[3]);
#ifdef __cplusplus
}
#endif
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