src/world.cpp

   1 #include "world.hpp"
   2
   3 #include <limits>
   4 #include <glm/gtx/transform.hpp>
   5
   6
   7 namespace blank {
   8
   9 const BlockType BlockType::DEFAULT;
  10 const NullShape BlockType::DEFAULT_SHAPE;
  11
  12 void BlockType::FillVBO(
  13         const glm::vec3 &pos,
  14         std::vector<glm::vec3> &vertices,
  15         std::vector<glm::vec3> &colors,
  16         std::vector<glm::vec3> &normals
  17 ) const {
  18         shape->Vertices(vertices, pos);
  19         colors.insert(colors.end(), shape->VertexCount(), color);
  20         shape->Normals(normals);
  21 }
  22
  23 void BlockType::FillOutlineVBO(
  24         std::vector<glm::vec3> &vertices,
  25         std::vector<glm::vec3> &colors
  26 ) const {
  27         shape->Outline(vertices);
  28         colors.insert(colors.end(), shape->OutlineCount(), outline_color);
  29 }
  30
  31
  32 BlockTypeRegistry::BlockTypeRegistry() {
  33         Add(BlockType::DEFAULT);
  34 }
  35
  36 int BlockTypeRegistry::Add(const BlockType &t) {
  37         int id = types.size();
  38         types.push_back(t);
  39         types.back().id = id;
  40         return id;
  41 }
  42
  43
  44 Chunk::Chunk()
  45 : blocks(Size())
  46 , model()
  47 , transform(1.0f)
  48 , dirty(false) {
  49
  50 }
  51
  52 Chunk::Chunk(Chunk &&other)
  53 : blocks(std::move(other.blocks))
  54 , model(std::move(other.model))
  55 , transform(other.transform)
  56 , dirty(other.dirty) {
  57
  58 }
  59
  60 Chunk &Chunk::operator =(Chunk &&other) {
  61         blocks = std::move(other.blocks);
  62         model = std::move(other.model);
  63         transform = other.transform;
  64         dirty = other.dirty;
  65         return *this;
  66 }
  67
  68
  69 void Chunk::Draw() {
  70         if (dirty) {
  71                 Update();
  72         }
  73         model.Draw();
  74 }
  75
  76
  77 bool Chunk::Intersection(
  78         const Ray &ray,
  79         const glm::mat4 &M,
  80         int *blkid,
  81         float *dist,
  82         glm::vec3 *normal) const {
  83         { // rough check
  84                 const AABB bb{{0, 0, 0}, {Width(), Height(), Depth()}};
  85                 if (!blank::Intersection(ray, bb, M)) {
  86                         return false;
  87                 }
  88         }
  89
  90         if (!blkid && !dist && !normal) {
  91                 return true;
  92         }
  93
  94         // TODO: should be possible to heavily optimize this
  95         int id = 0;
  96         int closest_id = -1;
  97         float closest_dist = std::numeric_limits<float>::infinity();
  98         glm::vec3 closest_normal(0, 1, 0);
  99         for (int z = 0; z < Depth(); ++z) {
 100                 for (int y = 0; y < Height(); ++y) {
 101                         for (int x = 0; x < Width(); ++x, ++id) {
 102                                 if (!blocks[id].type->visible) {
 103                                         continue;
 104                                 }
 105                                 float cur_dist;
 106                                 glm::vec3 cur_norm;
 107                                 glm::vec3 pos(float(x) + 0.5f, float(y) + 0.5f, float(z) + 0.5f);
 108                                 if (blocks[id].type->shape->Intersects(ray, glm::translate(M, pos), cur_dist, cur_norm)) {
 109                                         if (cur_dist < closest_dist) {
 110                                                 closest_id = id;
 111                                                 closest_dist = cur_dist;
 112                                                 closest_normal = cur_norm;
 113                                         }
 114                                 }
 115                         }
 116                 }
 117         }
 118
 119         if (closest_id < 0) {
 120                 return false;
 121         }
 122
 123         if (blkid) {
 124                 *blkid = closest_id;
 125         }
 126         if (dist) {
 127                 *dist = closest_dist;
 128         }
 129         if (normal) {
 130                 *normal = closest_normal;
 131         }
 132         return true;
 133 }
 134
 135 void Chunk::Position(const glm::vec3 &pos) {
 136         position = pos;
 137         transform = glm::translate(pos * Extent());
 138 }
 139
 140
 141 int Chunk::VertexCount() const {
 142         int count = 0;
 143         for (const auto &block : blocks) {
 144                 count += block.type->shape->VertexCount();
 145         }
 146         return count;
 147 }
 148
 149 void Chunk::Update() {
 150         model.Clear();
 151         model.Reserve(VertexCount());
 152
 153         for (size_t i = 0; i < Size(); ++i) {
 154                 blocks[i].type->FillModel(ToCoords(i), model);
 155         }
 156
 157         model.Invalidate();
 158         dirty = false;
 159 }
 160
 161
 162 World::World()
 163 : blockType()
 164 , blockShape({{ -0.5f, -0.5f, -0.5f }, { 0.5f, 0.5f, 0.5f }})
 165 , stairShape({{ -0.5f, -0.5f, -0.5f }, { 0.5f, 0.5f, 0.5f }}, { 0.0f, 0.0f })
 166 , slabShape({{ -0.5f, -0.5f, -0.5f }, { 0.5f, 0.0f, 0.5f }})
 167 , chunks() {
 168         blockType.Add(BlockType{ true, { 1.0f, 1.0f, 1.0f }, &blockShape }); // white block
 169         blockType.Add(BlockType{ true, { 1.0f, 1.0f, 1.0f }, &stairShape }); // white stair
 170         blockType.Add(BlockType{ true, { 1.0f, 1.0f, 1.0f }, &slabShape }); // white slab
 171         blockType.Add(BlockType{ true, { 1.0f, 0.0f, 0.0f }, &blockShape }); // red block
 172         blockType.Add(BlockType{ true, { 1.0f, 0.0f, 0.0f }, &stairShape }); // red stair
 173         blockType.Add(BlockType{ true, { 1.0f, 0.0f, 0.0f }, &slabShape }); // red slab
 174         blockType.Add(BlockType{ true, { 0.0f, 1.0f, 0.0f }, &blockShape }); // green block
 175         blockType.Add(BlockType{ true, { 0.0f, 1.0f, 0.0f }, &stairShape }); // green stair
 176         blockType.Add(BlockType{ true, { 0.0f, 1.0f, 0.0f }, &slabShape }); // green slab
 177         blockType.Add(BlockType{ true, { 0.0f, 0.0f, 1.0f }, &blockShape }); // blue block
 178         blockType.Add(BlockType{ true, { 0.0f, 0.0f, 1.0f }, &stairShape }); // blue stair
 179         blockType.Add(BlockType{ true, { 0.0f, 0.0f, 1.0f }, &slabShape }); // blue slab
 180 }
 181
 182
 183 void World::Generate() {
 184         for (int z = -1; z < 2; ++z) {
 185                 for (int y = -1; y < 2; ++y) {
 186                         for (int x = -1; x < 2; ++x) {
 187                                 Generate(glm::vec3(x, y, z));
 188                         }
 189                 }
 190         }
 191 }
 192
 193 Chunk &World::Generate(const glm::vec3 &pos) {
 194         chunks.emplace_back();
 195         Chunk &chunk = chunks.back();
 196         chunk.Position(pos);
 197         for (size_t i = 1; i < blockType.Size(); ++i) {
 198                 chunk.BlockAt(i) = Block(blockType[i]);
 199                 chunk.BlockAt(i + 257) = Block(blockType[i]);
 200                 chunk.BlockAt(i + 514) = Block(blockType[i]);
 201         }
 202         if (false) {
 203                 chunk.BlockAt(glm::vec3(0, 0, 0)) = Block(blockType[4]);
 204                 chunk.BlockAt(glm::vec3(0, 0, 1)) = Block(blockType[1]);
 205                 chunk.BlockAt(glm::vec3(1, 0, 0)) = Block(blockType[5]);
 206                 chunk.BlockAt(glm::vec3(1, 0, 1)) = Block(blockType[3]);
 207                 chunk.BlockAt(glm::vec3(2, 0, 0)) = Block(blockType[4]);
 208                 chunk.BlockAt(glm::vec3(2, 0, 1)) = Block(blockType[1]);
 209                 chunk.BlockAt(glm::vec3(3, 0, 0)) = Block(blockType[2]);
 210                 chunk.BlockAt(glm::vec3(3, 0, 1)) = Block(blockType[5]);
 211                 chunk.BlockAt(glm::vec3(2, 0, 2)) = Block(blockType[4]);
 212                 chunk.BlockAt(glm::vec3(2, 0, 3)) = Block(blockType[1]);
 213                 chunk.BlockAt(glm::vec3(3, 0, 2)) = Block(blockType[2]);
 214                 chunk.BlockAt(glm::vec3(3, 0, 3)) = Block(blockType[5]);
 215                 chunk.BlockAt(glm::vec3(1, 1, 0)) = Block(blockType[5]);
 216                 chunk.BlockAt(glm::vec3(1, 1, 1)) = Block(blockType[4]);
 217                 chunk.BlockAt(glm::vec3(2, 1, 1)) = Block(blockType[3]);
 218                 chunk.BlockAt(glm::vec3(2, 2, 1)) = Block(blockType[2]);
 219         }
 220         chunk.Invalidate();
 221         return chunk;
 222 }
 223
 224 bool World::Intersection(
 225                 const Ray &ray,
 226                 const glm::mat4 &M,
 227                 Chunk **chunk,
 228                 int *blkid,
 229                 float *dist,
 230                 glm::vec3 *normal) {
 231         Chunk *closest_chunk = nullptr;
 232         int closest_blkid = -1;
 233         float closest_dist = std::numeric_limits<float>::infinity();
 234         glm::vec3 closest_normal;
 235
 236         for (Chunk &cur_chunk : chunks) {
 237                 int cur_blkid;
 238                 float cur_dist;
 239                 glm::vec3 cur_normal;
 240                 if (cur_chunk.Intersection(ray, M * cur_chunk.Transform(), &cur_blkid, &cur_dist, &cur_normal)) {
 241                         if (cur_dist < closest_dist) {
 242                                 closest_chunk = &cur_chunk;
 243                                 closest_blkid = cur_blkid;
 244                                 closest_dist = cur_dist;
 245                                 closest_normal = cur_normal;
 246                         }
 247                 }
 248         }
 249
 250         if (chunk) {
 251                 *chunk = closest_chunk;
 252         }
 253         if (blkid) {
 254                 *blkid = closest_blkid;
 255         }
 256         if (dist) {
 257                 *dist = closest_dist;
 258         }
 259         if (normal) {
 260                 *normal = closest_normal;
 261         }
 262         return closest_chunk;
 263 }
 264
 265
 266 Chunk &World::Next(const Chunk &to, const glm::vec3 &dir) {
 267         const glm::vec3 tgt_pos = to.Position() + dir;
 268         for (Chunk &chunk : chunks) {
 269                 if (chunk.Position() == tgt_pos) {
 270                         return chunk;
 271                 }
 272         }
 273         return Generate(tgt_pos);
 274 }
 275
 276 }