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/*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* The Original Code is Copyright (C) 2018 by Blender Foundation.
* All rights reserved.
*/
/** \file
* \ingroup bke
*/
#ifndef __BKE_SUBDIV_EVAL_H__
#define __BKE_SUBDIV_EVAL_H__
#include "BLI_sys_types.h"
#ifdef __cplusplus
extern "C" {
#endif
struct Mesh;
struct Subdiv;
/* Returns true if evaluator is ready for use. */
bool BKE_subdiv_eval_begin(struct Subdiv *subdiv);
/* coarse_vertex_cos is an optional argument which allows to override coordinates of the coarse
* mesh. */
bool BKE_subdiv_eval_update_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. */
void BKE_subdiv_eval_limit_point(
struct Subdiv *subdiv, const int ptex_face_index, const float u, const float v, float r_P[3]);
void BKE_subdiv_eval_limit_point_and_derivatives(struct Subdiv *subdiv,
const int ptex_face_index,
const float u,
const 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,
const int ptex_face_index,
const float u,
const float v,
float r_P[3],
float r_N[3]);
void BKE_subdiv_eval_limit_point_and_short_normal(struct Subdiv *subdiv,
const int ptex_face_index,
const float u,
const float v,
float r_P[3],
short r_N[3]);
void BKE_subdiv_eval_face_varying(struct Subdiv *subdiv,
const int face_varying_channel,
const int ptex_face_index,
const float u,
const float v,
float r_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,
const int ptex_face_index,
const float u,
const float v,
const float dPdu[3],
const float dPdv[3],
float r_D[3]);
void BKE_subdiv_eval_final_point(
struct Subdiv *subdiv, const int ptex_face_index, const float u, const float v, float r_P[3]);
/* Patch queries at given resolution.
*
* Will evaluate patch at uniformly distributed (u, v) coordinates on a grid
* of given resolution, producing resolution^2 evaluation points. The order
* goes as u in rows, v in columns. */
void BKE_subdiv_eval_limit_patch_resolution_point(struct Subdiv *subdiv,
const int ptex_face_index,
const int resolution,
void *buffer,
const int offset,
const int stride);
void BKE_subdiv_eval_limit_patch_resolution_point_and_derivatives(struct Subdiv *subdiv,
const int ptex_face_index,
const int resolution,
void *point_buffer,
const int point_offset,
const int point_stride,
void *du_buffer,
const int du_offset,
const int du_stride,
void *dv_buffer,
const int dv_offset,
const int dv_stride);
void BKE_subdiv_eval_limit_patch_resolution_point_and_normal(struct Subdiv *subdiv,
const int ptex_face_index,
const int resolution,
void *point_buffer,
const int point_offset,
const int point_stride,
void *normal_buffer,
const int normal_offset,
const int normal_stride);
void BKE_subdiv_eval_limit_patch_resolution_point_and_short_normal(struct Subdiv *subdiv,
const int ptex_face_index,
const int resolution,
void *point_buffer,
const int point_offset,
const int point_stride,
void *normal_buffer,
const int normal_offset,
const int normal_stride);
#ifdef __cplusplus
}
#endif
#endif /* __BKE_SUBDIV_EVAL_H__ */
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