src/world/World.cpp

   1 #include "World.hpp"
   2
   3 #include "WorldCollision.hpp"
   4 #include "../graphics/BlockLighting.hpp"
   5 #include "../graphics/DirectionalLighting.hpp"
   6
   7 #include <iostream>
   8 #include <limits>
   9 #include <glm/gtx/io.hpp>
  10 #include <glm/gtx/transform.hpp>
  11
  12
  13 namespace blank {
  14
  15 World::World(const Config &config)
  16 : blockType()
  17 , blockShape({{ -0.5f, -0.5f, -0.5f }, { 0.5f, 0.5f, 0.5f }})
  18 , stairShape({{ -0.5f, -0.5f, -0.5f }, { 0.5f, 0.5f, 0.5f }}, { 0.0f, 0.0f })
  19 , slabShape({{ -0.5f, -0.5f, -0.5f }, { 0.5f, 0.0f, 0.5f }})
  20 , generate(config.gen)
  21 , chunks(config.load, blockType, generate)
  22 , player()
  23 , entities()
  24 , light_direction(config.light_direction)
  25 , fog_density(config.fog_density) {
  26         BlockType::Faces block_fill = {  true,  true,  true,  true,  true,  true };
  27         BlockType::Faces slab_fill  = { false,  true, false, false, false, false };
  28         BlockType::Faces stair_fill = { false,  true, false, false, false,  true };
  29
  30         { // white block
  31                 BlockType type(true, { 1.0f, 1.0f, 1.0f }, &blockShape);
  32                 type.block_light = true;
  33                 type.collision = true;
  34                 type.collide_block = true;
  35                 type.fill = block_fill;
  36                 blockType.Add(type);
  37         }
  38         { // white slab
  39                 BlockType type(true, { 1.0f, 1.0f, 1.0f }, &slabShape);
  40                 type.block_light = true;
  41                 type.collision = true;
  42                 type.collide_block = true;
  43                 type.fill = slab_fill;
  44                 blockType.Add(type);
  45         }
  46         { // white stair
  47                 BlockType type(true, { 1.0f, 1.0f, 1.0f }, &stairShape);
  48                 type.block_light = true;
  49                 type.collision = true;
  50                 type.collide_block = true;
  51                 type.fill = stair_fill;
  52                 blockType.Add(type);
  53         }
  54
  55         { // red block
  56                 BlockType type(true, { 1.0f, 0.0f, 0.0f }, &blockShape);
  57                 type.block_light = true;
  58                 type.collision = true;
  59                 type.collide_block = true;
  60                 type.fill = block_fill;
  61                 blockType.Add(type);
  62         }
  63         { // red slab
  64                 BlockType type(true, { 1.0f, 0.0f, 0.0f }, &slabShape);
  65                 type.block_light = true;
  66                 type.collision = true;
  67                 type.collide_block = true;
  68                 type.fill = slab_fill;
  69                 blockType.Add(type);
  70         }
  71         { // red stair
  72                 BlockType type(true, { 1.0f, 0.0f, 0.0f }, &stairShape);
  73                 type.block_light = true;
  74                 type.collision = true;
  75                 type.collide_block = true;
  76                 type.fill = stair_fill;
  77                 blockType.Add(type);
  78         }
  79
  80         { // green block
  81                 BlockType type(true, { 0.0f, 1.0f, 0.0f }, &blockShape);
  82                 type.block_light = true;
  83                 type.collision = true;
  84                 type.collide_block = true;
  85                 type.fill = block_fill;
  86                 blockType.Add(type);
  87         }
  88         { // green slab
  89                 BlockType type(true, { 0.0f, 1.0f, 0.0f }, &slabShape);
  90                 type.block_light = true;
  91                 type.collision = true;
  92                 type.collide_block = true;
  93                 type.fill = slab_fill;
  94                 blockType.Add(type);
  95         }
  96         { // green stair
  97                 BlockType type(true, { 0.0f, 1.0f, 0.0f }, &stairShape);
  98                 type.block_light = true;
  99                 type.collision = true;
 100                 type.collide_block = true;
 101                 type.fill = stair_fill;
 102                 blockType.Add(type);
 103         }
 104
 105         { // blue block
 106                 BlockType type(true, { 0.0f, 0.0f, 1.0f }, &blockShape);
 107                 type.block_light = true;
 108                 type.collision = true;
 109                 type.collide_block = true;
 110                 type.fill = block_fill;
 111                 blockType.Add(type);
 112         }
 113         { // blue slab
 114                 BlockType type(true, { 0.0f, 0.0f, 1.0f }, &slabShape);
 115                 type.block_light = true;
 116                 type.collision = true;
 117                 type.collide_block = true;
 118                 type.fill = slab_fill;
 119                 blockType.Add(type);
 120         }
 121         { // blue stair
 122                 BlockType type(true, { 0.0f, 0.0f, 1.0f }, &stairShape);
 123                 type.block_light = true;
 124                 type.collision = true;
 125                 type.collide_block = true;
 126                 type.fill = stair_fill;
 127                 blockType.Add(type);
 128         }
 129
 130         { // glowing yellow block
 131                 BlockType type(true, { 1.0f, 1.0f, 0.0f }, &blockShape);
 132                 type.luminosity = 15;
 133                 type.block_light = true;
 134                 type.collision = true;
 135                 type.collide_block = true;
 136                 type.fill = block_fill;
 137                 blockType.Add(type);
 138         }
 139
 140         generate.Space(0);
 141         generate.Light(13);
 142         generate.Solids({ 1, 4, 7, 10 });
 143
 144         player = &AddEntity();
 145         player->Name("player");
 146         player->Bounds({ { -0.5f, -0.5f, -0.5f }, { 0.5f, 0.5f, 0.5f } });
 147         player->WorldCollidable(true);
 148         player->Position(config.spawn);
 149
 150         chunks.GenerateSurrounding(player->ChunkCoords());
 151 }
 152
 153
 154 namespace {
 155
 156 struct Candidate {
 157         Chunk *chunk;
 158         float dist;
 159 };
 160
 161 std::vector<Candidate> candidates;
 162
 163 }
 164
 165 bool World::Intersection(
 166         const Ray &ray,
 167         const glm::mat4 &M,
 168         Chunk *&chunk,
 169         int &blkid,
 170         float &dist,
 171         glm::vec3 &normal
 172 ) {
 173         candidates.clear();
 174
 175         for (Chunk &cur_chunk : chunks.Loaded()) {
 176                 float cur_dist;
 177                 if (cur_chunk.Intersection(ray, M * cur_chunk.Transform(player->ChunkCoords()), cur_dist)) {
 178                         candidates.push_back({ &cur_chunk, cur_dist });
 179                 }
 180         }
 181
 182         if (candidates.empty()) return false;
 183
 184         chunk = nullptr;
 185         dist = std::numeric_limits<float>::infinity();
 186         blkid = -1;
 187
 188         for (Candidate &cand : candidates) {
 189                 if (cand.dist > dist) continue;
 190                 int cur_blkid;
 191                 float cur_dist;
 192                 glm::vec3 cur_normal;
 193                 if (cand.chunk->Intersection(ray, M * cand.chunk->Transform(player->ChunkCoords()), cur_blkid, cur_dist, cur_normal)) {
 194                         if (cur_dist < dist) {
 195                                 chunk = cand.chunk;
 196                                 blkid = cur_blkid;
 197                                 dist = cur_dist;
 198                                 normal = cur_normal;
 199                         }
 200                 }
 201         }
 202
 203         return chunk;
 204 }
 205
 206 bool World::Intersection(const Entity &e, std::vector<WorldCollision> &col) {
 207         AABB box = e.Bounds();
 208         glm::mat4 M = e.Transform(player->ChunkCoords());
 209         bool any = false;
 210         // TODO: this only needs to check the chunks surrounding the entity's chunk position
 211         //       need find out if that is quicker than the rough chunk bounds test
 212         for (Chunk &cur_chunk : chunks.Loaded()) {
 213                 if (cur_chunk.Intersection(box, M, cur_chunk.Transform(player->ChunkCoords()), col)) {
 214                         any = true;
 215                 }
 216         }
 217         return any;
 218 }
 219
 220
 221 Chunk &World::PlayerChunk() {
 222         return chunks.ForceLoad(player->ChunkCoords());
 223 }
 224
 225 Chunk &World::Next(const Chunk &to, const glm::tvec3<int> &dir) {
 226         const Chunk::Pos tgt_pos = to.Position() + dir;
 227         return chunks.ForceLoad(tgt_pos);
 228 }
 229
 230
 231 namespace {
 232
 233 std::vector<WorldCollision> col;
 234
 235 }
 236
 237 void World::Update(int dt) {
 238         for (Entity &entity : entities) {
 239                 entity.Update(dt);
 240         }
 241         for (Entity &entity : entities) {
 242                 col.clear();
 243                 if (entity.WorldCollidable() && Intersection(entity, col)) {
 244                         // entity collides with the world
 245                         Resolve(entity, col);
 246                 }
 247         }
 248         chunks.Rebase(player->ChunkCoords());
 249         chunks.Update(dt);
 250 }
 251
 252 void World::Resolve(Entity &e, std::vector<WorldCollision> &col) {
 253         // determine displacement for each cardinal axis and move entity accordingly
 254         glm::vec3 min_disp(0.0f);
 255         glm::vec3 max_disp(0.0f);
 256         for (const WorldCollision &c : col) {
 257                 if (!c.Blocks()) continue;
 258                 glm::vec3 local_disp(c.normal * c.depth);
 259                 // swap if neccessary (normal may point away from the entity)
 260                 if (dot(c.normal, e.Position() - c.BlockCoords()) < 0) {
 261                         local_disp *= -1;
 262                 }
 263                 min_disp = min(min_disp, local_disp);
 264                 max_disp = max(max_disp, local_disp);
 265         }
 266         // for each axis
 267         // if only one direction is set, use that as the final
 268         // if both directions are set, use average
 269         glm::vec3 final_disp(0.0f);
 270         for (int axis = 0; axis < 3; ++axis) {
 271                 if (std::abs(min_disp[axis]) > std::numeric_limits<float>::epsilon()) {
 272                         if (std::abs(max_disp[axis]) > std::numeric_limits<float>::epsilon()) {
 273                                 final_disp[axis] = (min_disp[axis] + max_disp[axis]) * 0.5f;
 274                         } else {
 275                                 final_disp[axis] = min_disp[axis];
 276                         }
 277                 } else if (std::abs(max_disp[axis]) > std::numeric_limits<float>::epsilon()) {
 278                         final_disp[axis] = max_disp[axis];
 279                 }
 280         }
 281         e.Move(final_disp);
 282 }
 283
 284
 285 void World::Render(BlockLighting &chunk_prog, DirectionalLighting &entity_prog) {
 286         chunk_prog.Activate();
 287         chunk_prog.SetFogDensity(fog_density);
 288         chunk_prog.SetView(glm::inverse(player->Transform(player->ChunkCoords())));
 289
 290         for (Chunk &chunk : chunks.Loaded()) {
 291                 glm::mat4 m(chunk.Transform(player->ChunkCoords()));
 292                 chunk_prog.SetM(m);
 293                 glm::mat4 mvp(chunk_prog.GetVP() * m);
 294                 if (!CullTest(Chunk::Bounds(), mvp)) {
 295                         chunk.Draw();
 296                 }
 297         }
 298
 299         entity_prog.Activate();
 300         entity_prog.SetLightDirection(light_direction);
 301         entity_prog.SetFogDensity(fog_density);
 302         entity_prog.SetView(glm::inverse(player->Transform(player->ChunkCoords())));
 303
 304         for (Entity &entity : entities) {
 305                 if (entity.HasShape()) {
 306                         entity_prog.SetM(entity.Transform(player->ChunkCoords()));
 307                         entity.Draw();
 308                 }
 309         }
 310 }
 311
 312 }