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/* SPDX-License-Identifier: GPL-2.0-or-later */
#pragma once
/** \file
* \ingroup bke
*/
#ifdef __cplusplus
extern "C" {
#endif
struct ReportList;
/**
* Compute simplified tangent space normals, i.e.
* tangent vector + sign of bi-tangent one, which combined with
* split normals can be used to recreate the full tangent space.
* NOTE: * The mesh should be made of only tris and quads!
*/
void BKE_mesh_calc_loop_tangent_single_ex(const float (*positions)[3],
int numVerts,
const struct MLoop *mloops,
float (*r_looptangent)[4],
const float (*loopnors)[3],
const struct MLoopUV *loopuv,
int numLoops,
const struct MPoly *mpolys,
int numPolys,
struct ReportList *reports);
/**
* Wrapper around BKE_mesh_calc_loop_tangent_single_ex, which takes care of most boilerplate code.
* \note
* - There must be a valid loop's CD_NORMALS available.
* - The mesh should be made of only tris and quads!
*/
void BKE_mesh_calc_loop_tangent_single(struct Mesh *mesh,
const char *uvmap,
float (*r_looptangents)[4],
struct ReportList *reports);
/**
* See: #BKE_editmesh_loop_tangent_calc (matching logic).
*/
void BKE_mesh_calc_loop_tangent_ex(const float (*positions)[3],
const struct MPoly *mpoly,
uint mpoly_len,
const struct MLoop *mloop,
const struct MLoopTri *looptri,
uint looptri_len,
struct CustomData *loopdata,
bool calc_active_tangent,
const char (*tangent_names)[64],
int tangent_names_len,
const float (*vert_normals)[3],
const float (*poly_normals)[3],
const float (*loop_normals)[3],
const float (*vert_orco)[3],
/* result */
struct CustomData *loopdata_out,
uint loopdata_out_len,
short *tangent_mask_curr_p);
void BKE_mesh_calc_loop_tangents(struct Mesh *me_eval,
bool calc_active_tangent,
const char (*tangent_names)[MAX_NAME],
int tangent_names_len);
/* Helpers */
void BKE_mesh_add_loop_tangent_named_layer_for_uv(struct CustomData *uv_data,
struct CustomData *tan_data,
int numLoopData,
const char *layer_name);
#define DM_TANGENT_MASK_ORCO (1 << 9)
/**
* Here we get some useful information such as active uv layer name and
* search if it is already in tangent_names.
* Also, we calculate tangent_mask that works as a descriptor of tangents state.
* If tangent_mask has changed, then recalculate tangents.
*/
void BKE_mesh_calc_loop_tangent_step_0(const struct CustomData *loopData,
bool calc_active_tangent,
const char (*tangent_names)[64],
int tangent_names_count,
bool *rcalc_act,
bool *rcalc_ren,
int *ract_uv_n,
int *rren_uv_n,
char *ract_uv_name,
char *rren_uv_name,
short *rtangent_mask);
#ifdef __cplusplus
}
#endif
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