92 lines
2.8 KiB
C++
92 lines
2.8 KiB
C++
/* SPDX-FileCopyrightText: 2023 Blender Authors
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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 bmesh
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*/
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#include "BLI_bit_span.hh"
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#include "BLI_compiler_attrs.h"
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#include "BLI_vector.hh"
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#include "bmesh_class.hh"
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/**
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* Parameters used to determine which kinds of data needs to be generated.
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*/
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struct BMPartialUpdate_Params {
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bool do_normals;
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bool do_tessellate;
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};
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/**
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* Cached data to speed up partial updates.
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*
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* Hints:
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*
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* - Avoid creating this data for single updates,
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* it should be created and reused across multiple updates to gain a significant benefit
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* (while transforming geometry for example).
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*
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* - Partial normal updates use face & loop indices,
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* setting them to dirty values between updates will slow down normal recalculation.
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*/
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struct BMPartialUpdate {
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blender::Vector<BMVert *> verts;
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blender::Vector<BMFace *> faces;
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/** Store the parameters used in creation so invalid use can be asserted. */
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BMPartialUpdate_Params params = {};
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};
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/**
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* All Tagged & Connected, see: #BM_mesh_partial_create_from_verts
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* Operate on everything that's tagged as well as connected geometry.
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*/
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[[nodiscard]] BMPartialUpdate *BM_mesh_partial_create_from_verts(
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BMesh &bm,
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const BMPartialUpdate_Params ¶ms,
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blender::BitSpan verts_mask,
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int verts_mask_count);
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/**
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* All Connected, operate on all faces that have both tagged and un-tagged vertices.
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*
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* Reduces computations when transforming isolated regions.
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*/
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[[nodiscard]] BMPartialUpdate *BM_mesh_partial_create_from_verts_group_single(
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BMesh &bm,
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const BMPartialUpdate_Params ¶ms,
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blender::BitSpan verts_mask,
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int verts_mask_count);
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/**
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* All Connected, operate on all faces that have vertices in the same group.
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*
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* Reduces computations when transforming isolated regions.
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*
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* This is a version of #BM_mesh_partial_create_from_verts_group_single
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* that handles multiple groups instead of a bitmap mask.
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*
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* This is needed for example when transform has mirror enabled,
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* since one side needs to have a different group to the other since a face that has vertices
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* attached to both won't have an affine transformation.
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*
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* \param verts_group: Vertex aligned array of groups.
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* Values are used as follows:
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* - >0: Each face is grouped with other faces of the same group.
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* - 0: Not in a group (don't handle these).
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* - -1: Don't use grouping logic (include any face that contains a vertex with this group).
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* \param verts_group_count: The number of non-zero values in `verts_groups`.
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*/
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[[nodiscard]] BMPartialUpdate *BM_mesh_partial_create_from_verts_group_multi(
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BMesh &bm,
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const BMPartialUpdate_Params ¶ms,
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blender::Span<int> verts_group,
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int verts_group_count);
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void BM_mesh_partial_destroy(BMPartialUpdate *bmpinfo) ATTR_NONNULL(1);
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