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Diffstat (limited to 'source/blender/blenkernel/BKE_subdiv.h')
| -rw-r--r-- | source/blender/blenkernel/BKE_subdiv.h | 184 |
1 files changed, 184 insertions, 0 deletions
diff --git a/source/blender/blenkernel/BKE_subdiv.h b/source/blender/blenkernel/BKE_subdiv.h new file mode 100644 index 00000000000..92fb1167f55 --- /dev/null +++ b/source/blender/blenkernel/BKE_subdiv.h @@ -0,0 +1,184 @@ +/* + * ***** BEGIN GPL LICENSE BLOCK ***** + * + * 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. + * + * Contributor(s): Sergey Sharybin. + * + * ***** END GPL LICENSE BLOCK ***** + */ +#ifndef __BKE_SUBDIV_H__ +#define __BKE_SUBDIV_H__ + +#include "BLI_sys_types.h" + +struct Mesh; +struct OpenSubdiv_Converter; +struct OpenSubdiv_Evaluator; +struct OpenSubdiv_TopologyRefiner; + +/** \file BKE_subdiv.h + * \ingroup bke + * \since July 2018 + * \author Sergey Sharybin + */ + +typedef enum { + SUBDIV_FVAR_LINEAR_INTERPOLATION_NONE, + SUBDIV_FVAR_LINEAR_INTERPOLATION_CORNERS_ONLY, + SUBDIV_FVAR_LINEAR_INTERPOLATION_BOUNDARIES, + SUBDIV_FVAR_LINEAR_INTERPOLATION_ALL, +} eSubdivFVarLinearInterpolation; + +typedef struct SubdivSettings { + bool is_simple; + bool is_adaptive; + int level; + eSubdivFVarLinearInterpolation fvar_linear_interpolation; +} SubdivSettings; + +typedef struct Subdiv { + /* Settings this subdivision surface is created for. + * + * It is read-only after assignment in BKE_subdiv_new_from_FOO(). + */ + SubdivSettings settings; + + /* Total number of ptex faces on subdivision level 0. + * + * Ptex face is what is internally used by OpenSubdiv for evaluator. It is + * a quad face, which corresponds to Blender's legacy Catmull Clark grids. + * + * Basically, here is a correspondence between polygons and ptex faces: + * - Triangle consists of 3 PTex faces. + * - Quad is a single PTex face. + * - N-gon is N PTex faces. + * + * This value is initialized in BKE_subdiv_new_from_FOO() and is read-only + * after this. + */ + int num_ptex_faces; + + /* Indexed by base face index, element indicates total number of ptex faces + * created for preceding base faces. + */ + int *face_ptex_offset; + + /* Topology refiner includes all the glue logic to feed Blender side + * topology to OpenSubdiv. It can be shared by both evaluator and GL mesh + * drawer. + */ + struct OpenSubdiv_TopologyRefiner *topology_refiner; + + /* CPU side evaluator. */ + struct OpenSubdiv_Evaluator *evaluator; +} Subdiv; + +/* ============================== CONSTRUCTION ============================== */ + +Subdiv *BKE_subdiv_new_from_converter(const SubdivSettings *settings, + struct OpenSubdiv_Converter *converter); + +Subdiv *BKE_subdiv_new_from_mesh(const SubdivSettings *settings, + struct Mesh *mesh); + +void BKE_subdiv_free(Subdiv *subdiv); + +/* ============================= EVALUATION API ============================= */ + +void BKE_subdiv_eval_begin(Subdiv *subdiv); +void BKE_subdiv_eval_update_from_mesh(Subdiv *subdiv, const struct Mesh *mesh); + +/* Single point queries. */ + +void BKE_subdiv_eval_limit_point( + Subdiv *subdiv, + const int ptex_face_index, + const float u, const float v, + float P[3]); +void BKE_subdiv_eval_limit_point_and_derivatives( + Subdiv *subdiv, + const int ptex_face_index, + const float u, const float v, + float P[3], float dPdu[3], float dPdv[3]); +void BKE_subdiv_eval_limit_point_and_normal( + Subdiv *subdiv, + const int ptex_face_index, + const float u, const float v, + float P[3], float N[3]); +void BKE_subdiv_eval_limit_point_and_short_normal( + Subdiv *subdiv, + const int ptex_face_index, + const float u, const float v, + float P[3], short N[3]); + +void BKE_subdiv_eval_face_varying( + Subdiv *subdiv, + const int ptex_face_index, + const float u, const float v, + float varying[2]); + +/* 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( + 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( + 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( + 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( + 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); + +/* =========================== SUBDIV TO MESH API =========================== */ + +typedef struct SubdivToMeshSettings { + /* Resolution at which ptex are being evaluated. + * This defines how many vertices final mesh will have: every ptex has + * resolution^2 vertices. + */ + int resolution; +} SubdivToMeshSettings; + +/* Create real hi-res mesh from subdivision, all geometry is "real". */ +struct Mesh *BKE_subdiv_to_mesh( + Subdiv *subdiv, + const SubdivToMeshSettings *settings, + const struct Mesh *coarse_mesh); + +#endif /* __BKE_SUBDIV_H__ */ |