mirror of
https://github.com/Relintai/pandemonium_engine.git
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198 lines
6.9 KiB
C++
198 lines
6.9 KiB
C++
#ifndef CSG_H
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#define CSG_H
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/*************************************************************************/
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/* csg.h */
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/*************************************************************************/
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/* This file is part of: */
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/* PANDEMONIUM ENGINE */
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/* https://github.com/Relintai/pandemonium_engine */
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/*************************************************************************/
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/* Copyright (c) 2022-present Péter Magyar. */
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/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md). */
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/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur. */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/*************************************************************************/
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#include "core/containers/list.h"
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#include "core/containers/oa_hash_map.h"
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#include "core/containers/pool_vector.h"
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#include "core/containers/rb_map.h"
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#include "core/containers/vector.h"
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#include "core/math/aabb.h"
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#include "core/math/plane.h"
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#include "core/math/transform.h"
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#include "core/math/vector2.h"
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#include "core/math/vector3.h"
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#include "core/object/reference.h"
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#include "scene/resources/material/material.h"
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#include "scene/resources/mesh/mesh.h"
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struct CSGBrush {
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struct Face {
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Vector3 vertices[3];
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Vector2 uvs[3];
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AABB aabb;
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bool smooth;
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bool invert;
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int material;
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};
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Vector<Face> faces;
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Vector<Ref<Material>> materials;
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inline void _regen_face_aabbs();
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// Create a brush from faces.
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void build_from_faces(const PoolVector<Vector3> &p_vertices, const PoolVector<Vector2> &p_uvs, const PoolVector<bool> &p_smooth, const PoolVector<Ref<Material>> &p_materials, const PoolVector<bool> &p_invert_faces);
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void copy_from(const CSGBrush &p_brush, const Transform &p_xform);
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};
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struct CSGBrushOperation {
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enum Operation {
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OPERATION_UNION,
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OPERATION_INTERSECTION,
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OPERATION_SUBTRACTION,
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};
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void merge_brushes(Operation p_operation, const CSGBrush &p_brush_a, const CSGBrush &p_brush_b, CSGBrush &r_merged_brush, float p_vertex_snap);
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struct MeshMerge {
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struct Face {
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bool from_b;
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bool inside;
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int points[3];
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Vector2 uvs[3];
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bool smooth;
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bool invert;
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int material_idx;
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};
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struct FaceBVH {
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int face;
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int left;
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int right;
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int next;
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Vector3 center;
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AABB aabb;
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};
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struct FaceBVHCmpX {
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_FORCE_INLINE_ bool operator()(const FaceBVH *p_left, const FaceBVH *p_right) const {
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return p_left->center.x < p_right->center.x;
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}
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};
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struct FaceBVHCmpY {
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_FORCE_INLINE_ bool operator()(const FaceBVH *p_left, const FaceBVH *p_right) const {
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return p_left->center.y < p_right->center.y;
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}
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};
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struct FaceBVHCmpZ {
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_FORCE_INLINE_ bool operator()(const FaceBVH *p_left, const FaceBVH *p_right) const {
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return p_left->center.z < p_right->center.z;
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}
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};
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struct VertexKey {
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int32_t x, y, z;
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_FORCE_INLINE_ bool operator<(const VertexKey &p_key) const {
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if (x == p_key.x) {
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if (y == p_key.y) {
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return z < p_key.z;
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} else {
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return y < p_key.y;
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}
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} else {
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return x < p_key.x;
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}
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}
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_FORCE_INLINE_ bool operator==(const VertexKey &p_key) const {
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return (x == p_key.x && y == p_key.y && z == p_key.z);
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}
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};
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struct VertexKeyHash {
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static _FORCE_INLINE_ uint32_t hash(const VertexKey &p_vk) {
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uint32_t h = hash_djb2_one_32(p_vk.x);
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h = hash_djb2_one_32(p_vk.y, h);
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h = hash_djb2_one_32(p_vk.z, h);
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return h;
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}
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};
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Vector<Vector3> points;
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Vector<Face> faces;
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RBMap<Ref<Material>, int> materials;
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RBMap<Vector3, int> vertex_map;
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OAHashMap<VertexKey, int, VertexKeyHash> snap_cache;
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float vertex_snap;
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inline void _add_distance(List<real_t> &r_intersectionsA, List<real_t> &r_intersectionsB, bool p_from_B, real_t p_distance) const;
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inline bool _bvh_inside(FaceBVH *facebvhptr, int p_max_depth, int p_bvh_first, int p_face_idx) const;
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inline int _create_bvh(FaceBVH *facebvhptr, FaceBVH **facebvhptrptr, int p_from, int p_size, int p_depth, int &r_max_depth, int &r_max_alloc);
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void add_face(const Vector3 p_points[3], const Vector2 p_uvs[3], bool p_smooth, bool p_invert, const Ref<Material> &p_material, bool p_from_b);
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void mark_inside_faces();
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};
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struct Build2DFaces {
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struct Vertex2D {
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Vector2 point;
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Vector2 uv;
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};
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struct Face2D {
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int vertex_idx[3] = {};
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};
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Vector<Vertex2D> vertices;
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Vector<Face2D> faces;
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Plane plane;
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Transform to_2D;
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Transform to_3D;
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float vertex_snap2 = 0.0;
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inline int _get_point_idx(const Vector2 &p_point);
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inline int _add_vertex(const Vertex2D &p_vertex);
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inline void _add_vertex_idx_sorted(Vector<int> &r_vertex_indices, int p_new_vertex_index);
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inline void _merge_faces(const Vector<int> &p_segment_indices);
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inline void _find_edge_intersections(const Vector2 p_segment_points[2], Vector<int> &r_segment_indices);
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inline int _insert_point(const Vector2 &p_point);
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void insert(const CSGBrush &p_brush, int p_brush_face);
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void addFacesToMesh(MeshMerge &r_mesh_merge, bool p_smooth, bool p_invert, const Ref<Material> &p_material, bool p_from_b);
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Build2DFaces() {}
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Build2DFaces(const CSGBrush &p_brush, int p_brush_face, float p_vertex_snap2);
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};
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struct Build2DFaceCollection {
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RBMap<int, Build2DFaces> build2DFacesA;
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RBMap<int, Build2DFaces> build2DFacesB;
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};
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void update_faces(const CSGBrush &p_brush_a, const int p_face_idx_a, const CSGBrush &p_brush_b, const int p_face_idx_b, Build2DFaceCollection &p_collection, float p_vertex_snap);
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};
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#endif // CSG_H
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