7966cd16d6
Implements #95967. Currently the `MPoly` struct is 12 bytes, and stores the index of a face's first corner and the number of corners/verts/edges. Polygons and corners are always created in order by Blender, meaning each face's corners will be after the previous face's corners. We can take advantage of this fact and eliminate the redundancy in mesh face storage by only storing a single integer corner offset for each face. The size of the face is then encoded by the offset of the next face. The size of a single integer is 4 bytes, so this reduces memory usage by 3 times. The same method is used for `CurvesGeometry`, so Blender already has an abstraction to simplify using these offsets called `OffsetIndices`. This class is used to easily retrieve a range of corner indices for each face. This also gives the opportunity for sharing some logic with curves. Another benefit of the change is that the offsets and sizes stored in `MPoly` can no longer disagree with each other. Storing faces in the order of their corners can simplify some code too. Face/polygon variables now use the `IndexRange` type, which comes with quite a few utilities that can simplify code. Some: - The offset integer array has to be one longer than the face count to avoid a branch for every face, which means the data is no longer part of the mesh's `CustomData`. - We lose the ability to "reference" an original mesh's offset array until more reusable CoW from #104478 is committed. That will be added in a separate commit. - Since they aren't part of `CustomData`, poly offsets often have to be copied manually. - To simplify using `OffsetIndices` in many places, some functions and structs in headers were moved to only compile in C++. - All meshes created by Blender use the same order for faces and face corners, but just in case, meshes with mismatched order are fixed by versioning code. - `MeshPolygon.totloop` is no longer editable in RNA. This API break is necessary here unfortunately. It should be worth it in 3.6, since that's the best way to allow loading meshes from 4.0, which is important for an LTS version. Pull Request: https://projects.blender.org/blender/blender/pulls/105938
250 lines
10 KiB
C
250 lines
10 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later
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* Copyright 2007 by Nicholas Bishop. All rights reserved. */
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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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#include "BKE_subsurf.h"
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#include "BLI_utildefines.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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struct Depsgraph;
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struct DerivedMesh;
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struct MDisps;
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struct Mesh;
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struct ModifierData;
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struct MultiresModifierData;
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struct Object;
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struct Scene;
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struct SubdivCCG;
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struct MLoopTri;
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/**
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* Delete mesh mdisps and grid paint masks.
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*/
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void multires_customdata_delete(struct Mesh *me);
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void multires_set_tot_level(struct Object *ob, struct MultiresModifierData *mmd, int lvl);
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void multires_mark_as_modified(struct Depsgraph *depsgraph,
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struct Object *object,
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enum MultiresModifiedFlags flags);
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void multires_flush_sculpt_updates(struct Object *object);
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void multires_force_sculpt_rebuild(struct Object *object);
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void multires_force_external_reload(struct Object *object);
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/* internal, only called in subsurf_ccg.cc */
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void multires_modifier_update_mdisps(struct DerivedMesh *dm, struct Scene *scene);
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void multires_modifier_update_hidden(struct DerivedMesh *dm);
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/**
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* Reset the multi-res levels to match the number of mdisps.
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*/
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void multiresModifier_set_levels_from_disps(struct MultiresModifierData *mmd, struct Object *ob);
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typedef enum MultiresFlags {
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MULTIRES_USE_LOCAL_MMD = 1,
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MULTIRES_USE_RENDER_PARAMS = 2,
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MULTIRES_ALLOC_PAINT_MASK = 4,
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MULTIRES_IGNORE_SIMPLIFY = 8,
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} MultiresFlags;
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ENUM_OPERATORS(MultiresFlags, MULTIRES_IGNORE_SIMPLIFY);
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struct DerivedMesh *multires_make_derived_from_derived(struct DerivedMesh *dm,
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struct MultiresModifierData *mmd,
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struct Scene *scene,
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struct Object *ob,
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MultiresFlags flags);
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struct MultiresModifierData *find_multires_modifier_before(struct Scene *scene,
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struct ModifierData *lastmd);
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/**
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* used for applying scale on mdisps layer and syncing subdivide levels when joining objects.
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* \param use_first: return first multi-res modifier if all multi-res'es are disabled.
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*/
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struct MultiresModifierData *get_multires_modifier(struct Scene *scene,
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struct Object *ob,
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bool use_first);
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int multires_get_level(const struct Scene *scene,
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const struct Object *ob,
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const struct MultiresModifierData *mmd,
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bool render,
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bool ignore_simplify);
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/**
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* Creates mesh with multi-res modifier applied on current object's deform mesh.
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*/
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struct Mesh *BKE_multires_create_mesh(struct Depsgraph *depsgraph,
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struct Object *object,
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struct MultiresModifierData *mmd);
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/**
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* Get coordinates of a deformed base mesh which is an input to the given multi-res modifier.
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* \note The modifiers will be re-evaluated.
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*/
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float (*BKE_multires_create_deformed_base_mesh_vert_coords(struct Depsgraph *depsgraph,
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struct Object *object,
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struct MultiresModifierData *mmd,
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int *r_num_deformed_verts))[3];
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/**
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* \param direction: 1 for delete higher, 0 for lower (not implemented yet).
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*/
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void multiresModifier_del_levels(struct MultiresModifierData *mmd,
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struct Scene *scene,
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struct Object *object,
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int direction);
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void multiresModifier_base_apply(struct Depsgraph *depsgraph,
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struct Object *object,
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struct MultiresModifierData *mmd);
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int multiresModifier_rebuild_subdiv(struct Depsgraph *depsgraph,
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struct Object *object,
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struct MultiresModifierData *mmd,
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int rebuild_limit,
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bool switch_view_to_lower_level);
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/**
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* If `ob_src` and `ob_dst` both have multi-res modifiers,
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* synchronize them such that `ob_dst` has the same total number of levels as `ob_src`.
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*/
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void multiresModifier_sync_levels_ex(struct Object *ob_dst,
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struct MultiresModifierData *mmd_src,
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struct MultiresModifierData *mmd_dst);
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void multires_stitch_grids(struct Object *);
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void multiresModifier_scale_disp(struct Depsgraph *depsgraph,
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struct Scene *scene,
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struct Object *ob);
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void multiresModifier_prepare_join(struct Depsgraph *depsgraph,
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struct Scene *scene,
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struct Object *ob,
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struct Object *to_ob);
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int multires_mdisp_corners(const struct MDisps *s);
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/**
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* Update multi-res data after topology changing.
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*/
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void multires_topology_changed(struct Mesh *me);
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/**
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* Makes sure data from an external file is fully read.
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*
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* Since the multi-res data files only contain displacement vectors without knowledge about
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* subdivision level some extra work is needed. Namely make is to all displacement grids have
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* proper level and number of displacement vectors set.
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*/
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void multires_ensure_external_read(struct Mesh *mesh, int top_level);
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void multiresModifier_ensure_external_read(struct Mesh *mesh,
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const struct MultiresModifierData *mmd);
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/**** interpolation stuff ****/
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/* Adapted from `sculptmode.c` */
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void old_mdisps_bilinear(float out[3], float (*disps)[3], int st, float u, float v);
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/**
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* Find per-corner coordinate with given per-face UV coord.
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*/
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int mdisp_rot_face_to_crn(int face_size, int face_side, float u, float v, float *x, float *y);
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/* Reshaping, define in multires_reshape.cc */
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bool multiresModifier_reshapeFromVertcos(struct Depsgraph *depsgraph,
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struct Object *object,
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struct MultiresModifierData *mmd,
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const float (*vert_coords)[3],
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int num_vert_coords);
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/**
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* Returns truth on success, false otherwise.
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*
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* This function might fail in cases like source and destination not having
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* matched amount of vertices.
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*/
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bool multiresModifier_reshapeFromObject(struct Depsgraph *depsgraph,
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struct MultiresModifierData *mmd,
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struct Object *dst,
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struct Object *src);
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bool multiresModifier_reshapeFromDeformModifier(struct Depsgraph *depsgraph,
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struct Object *ob,
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struct MultiresModifierData *mmd,
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struct ModifierData *deform_md);
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bool multiresModifier_reshapeFromCCG(int tot_level,
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struct Mesh *coarse_mesh,
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struct SubdivCCG *subdiv_ccg);
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/* Subdivide multi-res displacement once. */
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typedef enum eMultiresSubdivideModeType {
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MULTIRES_SUBDIVIDE_CATMULL_CLARK,
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MULTIRES_SUBDIVIDE_SIMPLE,
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MULTIRES_SUBDIVIDE_LINEAR,
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} eMultiresSubdivideModeType;
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void multiresModifier_subdivide(struct Object *object,
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struct MultiresModifierData *mmd,
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eMultiresSubdivideModeType mode);
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void multires_subdivide_create_tangent_displacement_linear_grids(struct Object *object,
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struct MultiresModifierData *mmd);
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/**
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* Subdivide displacement to the given level.
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* If level is lower than the current top level nothing happens.
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*/
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void multiresModifier_subdivide_to_level(struct Object *object,
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struct MultiresModifierData *mmd,
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int top_level,
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eMultiresSubdivideModeType mode);
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/* Subdivision integration, defined in multires_subdiv.cc */
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struct SubdivSettings;
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struct SubdivToMeshSettings;
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void BKE_multires_subdiv_settings_init(struct SubdivSettings *settings,
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const struct MultiresModifierData *mmd);
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/* TODO(sergey): Replace this set of boolean flags with bitmask. */
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void BKE_multires_subdiv_mesh_settings_init(struct SubdivToMeshSettings *mesh_settings,
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const struct Scene *scene,
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const struct Object *object,
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const struct MultiresModifierData *mmd,
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bool use_render_params,
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bool ignore_simplify,
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bool ignore_control_edges);
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/* General helpers. */
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/**
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* For a given partial derivatives of a PTEX face get tangent matrix for displacement.
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*
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* Corner needs to be known to properly "rotate" partial derivatives when the
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* matrix is being constructed for quad. For non-quad the corner is to be set to 0.
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*/
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BLI_INLINE void BKE_multires_construct_tangent_matrix(float tangent_matrix[3][3],
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const float dPdu[3],
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const float dPdv[3],
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int corner);
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/* Versioning. */
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/**
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* Convert displacement which is stored for simply-subdivided mesh to a Catmull-Clark
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* subdivided mesh.
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*/
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void multires_do_versions_simple_to_catmull_clark(struct Object *object,
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struct MultiresModifierData *mmd);
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#ifdef __cplusplus
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}
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#endif
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#include "intern/multires_inline.h"
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