113 lines
4.5 KiB
C
113 lines
4.5 KiB
C
/* SPDX-FileCopyrightText: 2023 Blender Foundation
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*
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* SPDX-License-Identifier: GPL-2.0-or-later */
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#pragma once
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/** \file
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* \ingroup bke
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*/
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#ifdef __cplusplus
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# include "BLI_offset_indices.hh"
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#endif
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#ifdef __cplusplus
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struct ReportList;
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/**
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* Compute simplified tangent space normals, i.e.
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* tangent vector + sign of bi-tangent one, which combined with
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* split normals can be used to recreate the full tangent space.
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*
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* \note The mesh should be made of only triangles and quads!
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*/
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void BKE_mesh_calc_loop_tangent_single_ex(const float (*vert_positions)[3],
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int numVerts,
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const int *corner_verts,
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float (*r_looptangent)[4],
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const float (*loop_normals)[3],
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const float (*loopuv)[2],
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int numLoops,
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blender::OffsetIndices<int> polys,
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struct ReportList *reports);
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* Wrapper around BKE_mesh_calc_loop_tangent_single_ex, which takes care of most boilerplate code.
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* \note
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* - There must be a valid loop's CD_NORMALS available.
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* - The mesh should be made of only triangles and quads!
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*/
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void BKE_mesh_calc_loop_tangent_single(struct Mesh *mesh,
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const char *uvmap,
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float (*r_looptangents)[4],
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struct ReportList *reports);
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#ifdef __cplusplus
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}
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#endif
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#ifdef __cplusplus
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/**
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* See: #BKE_editmesh_loop_tangent_calc (matching logic).
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*/
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void BKE_mesh_calc_loop_tangent_ex(const float (*vert_positions)[3],
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blender::OffsetIndices<int> polys,
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const int *corner_verts,
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const struct MLoopTri *looptri,
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const int *looptri_polys,
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uint looptri_len,
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const bool *sharp_faces,
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struct CustomData *loopdata,
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bool calc_active_tangent,
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const char (*tangent_names)[MAX_CUSTOMDATA_LAYER_NAME],
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int tangent_names_len,
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const float (*vert_normals)[3],
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const float (*poly_normals)[3],
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const float (*loop_normals)[3],
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const float (*vert_orco)[3],
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/* result */
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struct CustomData *loopdata_out,
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uint loopdata_out_len,
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short *tangent_mask_curr_p);
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void BKE_mesh_calc_loop_tangents(struct Mesh *me_eval,
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bool calc_active_tangent,
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const char (*tangent_names)[MAX_CUSTOMDATA_LAYER_NAME],
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int tangent_names_len);
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/* Helpers */
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void BKE_mesh_add_loop_tangent_named_layer_for_uv(struct CustomData *uv_data,
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struct CustomData *tan_data,
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int numLoopData,
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const char *layer_name);
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# define DM_TANGENT_MASK_ORCO (1 << 9)
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/**
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* Here we get some useful information such as active uv layer name and
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* search if it is already in tangent_names.
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* Also, we calculate tangent_mask that works as a descriptor of tangents state.
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* If tangent_mask has changed, then recalculate tangents.
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*/
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void BKE_mesh_calc_loop_tangent_step_0(const struct CustomData *loopData,
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bool calc_active_tangent,
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const char (*tangent_names)[MAX_CUSTOMDATA_LAYER_NAME],
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int tangent_names_count,
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bool *rcalc_act,
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bool *rcalc_ren,
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int *ract_uv_n,
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int *rren_uv_n,
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char *ract_uv_name,
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char *rren_uv_name,
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short *rtangent_mask);
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#endif
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