1 #ifndef BLANK_WORLD_CHUNK_HPP_
2 #define BLANK_WORLD_CHUNK_HPP_
5 #include "BlockTypeRegistry.hpp"
6 #include "../geometry/Location.hpp"
7 #include "../geometry/primitive.hpp"
10 #include <glm/glm.hpp>
11 #include <glm/gtx/transform.hpp>
20 /// cube of size 16 (256 tiles, 4096 blocks)
24 explicit Chunk(const BlockTypeRegistry &) noexcept;
26 Chunk(Chunk &&) noexcept;
27 Chunk &operator =(Chunk &&) noexcept;
29 static constexpr int side = ExactLocation::scale;
30 static constexpr float fside = ExactLocation::fscale;
31 static constexpr int size = side * side * side;
33 static AABB Bounds() noexcept { return AABB{ { 0.0f, 0.0f, 0.0f }, ExactLocation::FExtent() }; }
34 static glm::vec3 Center() noexcept { return glm::vec3(8.0f); }
35 static float Radius() noexcept { return 27.71281292110203669632f; /* 16 * √3 */ }
37 static constexpr bool InBounds(const ExactLocation::Fine &pos) noexcept {
39 pos.x >= 0.0f && pos.x < fside &&
40 pos.y >= 0.0f && pos.y < fside &&
41 pos.z >= 0.0f && pos.z < fside;
43 static constexpr bool InBounds(const RoughLocation::Fine &pos) noexcept {
45 pos.x >= 0 && pos.x < side &&
46 pos.y >= 0 && pos.y < side &&
47 pos.z >= 0 && pos.z < side;
49 static constexpr int ToIndex(const RoughLocation::Fine &pos) noexcept {
50 return pos.x + pos.y * side + pos.z * side * side;
52 static constexpr bool InBounds(int idx) noexcept {
53 return idx >= 0 && idx < size;
55 static ExactLocation::Fine ToCoords(int idx) noexcept {
56 return ExactLocation::Fine(
58 0.5f + ((idx / side) % side),
59 0.5f + (idx / (side * side))
62 static ExactLocation::Fine ToCoords(const RoughLocation::Fine &pos) noexcept {
63 return ExactLocation::Fine(pos) + 0.5f;
65 static RoughLocation::Fine ToPos(int idx) noexcept {
66 return RoughLocation::Fine(
68 ((idx / side) % side),
72 /// get a chunk-local transform for block at given position and index
73 /// (position and index are redundant)
74 glm::mat4 ToTransform(const RoughLocation::Fine &position, int index) const noexcept;
75 /// same as above, but also apply offset to given reference
76 glm::mat4 ToTransform(const ExactLocation::Coarse &ref, const RoughLocation::Fine &pos, int idx) const noexcept;
78 ExactLocation::Fine ToSceneCoords(const ExactLocation::Coarse &base, const ExactLocation::Fine &pos) const noexcept {
79 return ExactLocation::Fine((position - base) * ExactLocation::Extent()) + pos;
82 static bool IsBorder(const RoughLocation::Fine &pos) noexcept {
91 static constexpr bool IsBorder(int idx) noexcept {
93 idx < side * side || // low Z plane
94 idx % side == 0 || // low X plane
95 (idx / (side * side)) == side - 1 || // high Z plane
96 idx % side == side - 1 || // high X plane
97 (idx / side) % side == 0 || // low Y plane
98 (idx / side) % side == side - 1; // high Y plane
101 bool IsSurface(int index) const noexcept { return IsSurface(ToPos(index)); }
102 bool IsSurface(const ExactLocation::Fine &pos) const noexcept { return IsSurface(RoughLocation::Fine(pos)); }
103 bool IsSurface(const RoughLocation::Fine &pos) const noexcept;
105 void SetNeighbor(Block::Face, Chunk &) noexcept;
106 bool HasNeighbor(Block::Face f) const noexcept { return neighbor[f]; }
107 Chunk &GetNeighbor(Block::Face f) noexcept { return *neighbor[f]; }
108 const Chunk &GetNeighbor(Block::Face f) const noexcept { return *neighbor[f]; }
109 void Unlink() noexcept;
111 // check which faces of a block at given index are obstructed (and therefore invisible)
112 Block::FaceSet Obstructed(const RoughLocation::Fine &) const noexcept;
114 void SetBlock(int index, const Block &) noexcept;
115 void SetBlock(const ExactLocation::Fine &pos, const Block &block) noexcept { SetBlock(ToIndex(pos), block); }
116 void SetBlock(const RoughLocation::Fine &pos, const Block &block) noexcept { SetBlock(ToIndex(pos), block); }
118 const Block &BlockAt(int index) const noexcept { return blocks[index]; }
119 const Block &BlockAt(const ExactLocation::Fine &pos) const noexcept { return BlockAt(ToIndex(pos)); }
120 const Block &BlockAt(const RoughLocation::Fine &pos) const noexcept { return BlockAt(ToIndex(pos)); }
122 const BlockType &Type(const Block &b) const noexcept { return types->Get(b.type); }
123 const BlockType &Type(int index) const noexcept { return Type(BlockAt(index)); }
125 void SetLight(int index, int level) noexcept;
126 void SetLight(const ExactLocation::Fine &pos, int level) noexcept { SetLight(ToIndex(pos), level); }
127 void SetLight(const RoughLocation::Fine &pos, int level) noexcept { SetLight(ToIndex(pos), level); }
129 int GetLight(int index) const noexcept;
130 int GetLight(const ExactLocation::Fine &pos) const noexcept { return GetLight(ToIndex(pos)); }
131 int GetLight(const RoughLocation::Fine &pos) const noexcept { return GetLight(ToIndex(pos)); }
133 float GetVertexLight(const RoughLocation::Fine &, const BlockMesh::Position &, const EntityMesh::Normal &) const noexcept;
137 const ExactLocation::Coarse &reference,
140 return blank::Intersection(ray, Bounds(), Transform(reference), &dist);
143 /// check if given ray intersects any block of this chunk
144 /// given reference indicated the chunk offset of the ray in world space
147 const ExactLocation::Coarse &reference,
148 WorldCollision &) noexcept;
152 const glm::mat4 &Mbox,
153 const glm::mat4 &Mchunk,
154 std::vector<WorldCollision> &) noexcept;
157 const Entity &entity,
158 const glm::mat4 &Mentity,
159 const glm::mat4 &Mchunk,
160 std::vector<WorldCollision> &) noexcept;
162 void Position(const ExactLocation::Coarse &pos) noexcept { position = pos; }
163 const ExactLocation::Coarse &Position() const noexcept { return position; }
165 glm::mat4 Transform(const ExactLocation::Coarse &offset) const noexcept {
166 return glm::translate((position - offset) * ExactLocation::Extent());
169 void *BlockData() noexcept { return &blocks[0]; }
170 const void *BlockData() const noexcept { return &blocks[0]; }
171 static constexpr std::size_t BlockSize() noexcept { return offsetof(Chunk, position) - offsetof(Chunk, blocks); }
173 bool Generated() const noexcept { return generated; }
174 void SetGenerated() noexcept { generated = true; }
175 bool Lighted() const noexcept { return lighted; }
178 void Ref() noexcept { ++ref_count; }
179 void UnRef() noexcept { --ref_count; }
180 bool Referenced() const noexcept { return ref_count > 0; }
182 void Invalidate() noexcept { dirty_mesh = dirty_save = true; }
183 void InvalidateMesh() noexcept { dirty_mesh = true; }
184 void ClearMesh() noexcept { dirty_mesh = false; }
185 void ClearSave() noexcept { dirty_save = false; }
186 bool ShouldUpdateMesh() const noexcept { return dirty_mesh; }
187 bool ShouldUpdateSave() const noexcept { return dirty_save; }
189 void Update(BlockMesh &) noexcept;
192 const BlockTypeRegistry *types;
193 Chunk *neighbor[Block::FACE_COUNT];
196 unsigned char light[size];
200 ExactLocation::Coarse position;