src/world/World.cpp

   1 #include "World.hpp"
   2
   3 #include "EntityCollision.hpp"
   4 #include "WorldCollision.hpp"
   5 #include "../app/Assets.hpp"
   6 #include "../app/TextureIndex.hpp"
   7 #include "../graphics/Format.hpp"
   8 #include "../graphics/Viewport.hpp"
   9
  10 #include <limits>
  11 #include <glm/gtx/io.hpp>
  12 #include <glm/gtx/transform.hpp>
  13
  14
  15 namespace blank {
  16
  17 World::World(const Assets &assets, const Config &config, const WorldSave &save)
  18 : block_type()
  19 , block_tex()
  20 , generate(config.gen)
  21 , chunks(config.load, block_type, generate, save)
  22 , player()
  23 , entities()
  24 , light_direction(config.light_direction)
  25 , fog_density(config.fog_density) {
  26         TextureIndex tex_index;
  27         assets.LoadBlockTypes("default", block_type, tex_index);
  28
  29         block_tex.Bind();
  30         assets.LoadTextures(tex_index, block_tex);
  31         block_tex.FilterNearest();
  32
  33         generate.Space(0);
  34         generate.Light(13);
  35         generate.Solids({ 1, 4, 7, 10 });
  36
  37         player = &AddEntity();
  38         player->Name("player");
  39         player->Bounds({ { -0.5f, -0.5f, -0.5f }, { 0.5f, 0.5f, 0.5f } });
  40         player->WorldCollidable(true);
  41         player->Position(config.spawn);
  42
  43         chunks.QueueSurrounding(player->ChunkCoords());
  44 }
  45
  46
  47 namespace {
  48
  49 struct Candidate {
  50         Chunk *chunk;
  51         float dist;
  52 };
  53
  54 std::vector<Candidate> candidates;
  55
  56 }
  57
  58 bool World::Intersection(
  59         const Ray &ray,
  60         const glm::mat4 &M,
  61         const Chunk::Pos &reference,
  62         WorldCollision &coll
  63 ) {
  64         candidates.clear();
  65
  66         for (Chunk &cur_chunk : chunks.Loaded()) {
  67                 float cur_dist;
  68                 if (cur_chunk.Intersection(ray, M * cur_chunk.Transform(reference), cur_dist)) {
  69                         candidates.push_back({ &cur_chunk, cur_dist });
  70                 }
  71         }
  72
  73         if (candidates.empty()) return false;
  74
  75         coll.chunk = nullptr;
  76         coll.block = -1;
  77         coll.depth = std::numeric_limits<float>::infinity();
  78
  79         for (Candidate &cand : candidates) {
  80                 if (cand.dist > coll.depth) continue;
  81                 WorldCollision cur_coll;
  82                 if (cand.chunk->Intersection(ray, M * cand.chunk->Transform(reference), cur_coll)) {
  83                         if (cur_coll.depth < coll.depth) {
  84                                 coll = cur_coll;
  85                         }
  86                 }
  87         }
  88
  89         return coll.chunk;
  90 }
  91
  92 bool World::Intersection(
  93         const Ray &ray,
  94         const glm::mat4 &M,
  95         const Entity &reference,
  96         EntityCollision &coll
  97 ) {
  98         coll.entity = nullptr;
  99         coll.depth = std::numeric_limits<float>::infinity();
 100         for (Entity &cur_entity : entities) {
 101                 if (&cur_entity == &reference) {
 102                         continue;
 103                 }
 104                 float cur_dist;
 105                 glm::vec3 cur_normal;
 106                 if (blank::Intersection(ray, cur_entity.Bounds(), M * cur_entity.Transform(reference.ChunkCoords()), &cur_dist, &cur_normal)) {
 107                         // TODO: fine grained check goes here? maybe?
 108                         if (cur_dist < coll.depth) {
 109                                 coll.entity = &cur_entity;
 110                                 coll.depth = cur_dist;
 111                                 coll.normal = cur_normal;
 112                         }
 113                 }
 114         }
 115
 116         return coll.entity;
 117 }
 118
 119 bool World::Intersection(const Entity &e, std::vector<WorldCollision> &col) {
 120         AABB box = e.Bounds();
 121         Chunk::Pos reference = e.ChunkCoords();
 122         glm::mat4 M = e.Transform(reference);
 123         bool any = false;
 124         for (Chunk &cur_chunk : chunks.Loaded()) {
 125                 if (manhattan_radius(cur_chunk.Position() - e.ChunkCoords()) > 1) {
 126                         // chunk is not one of the 3x3x3 surrounding the entity
 127                         // since there's no entity which can extent over 16 blocks, they can be skipped
 128                         continue;
 129                 }
 130                 if (cur_chunk.Intersection(box, M, cur_chunk.Transform(reference), col)) {
 131                         any = true;
 132                 }
 133         }
 134         return any;
 135 }
 136
 137
 138 Chunk &World::PlayerChunk() {
 139         return chunks.ForceLoad(player->ChunkCoords());
 140 }
 141
 142
 143 namespace {
 144
 145 std::vector<WorldCollision> col;
 146
 147 }
 148
 149 void World::Update(int dt) {
 150         for (Entity &entity : entities) {
 151                 entity.Update(dt);
 152         }
 153         for (Entity &entity : entities) {
 154                 col.clear();
 155                 if (entity.WorldCollidable() && Intersection(entity, col)) {
 156                         // entity collides with the world
 157                         Resolve(entity, col);
 158                 }
 159         }
 160         for (auto iter = entities.begin(), end = entities.end(); iter != end;) {
 161                 if (iter->CanRemove()) {
 162                         iter = entities.erase(iter);
 163                 } else {
 164                         ++iter;
 165                 }
 166         }
 167         chunks.Rebase(player->ChunkCoords());
 168         chunks.Update(dt);
 169 }
 170
 171 void World::Resolve(Entity &e, std::vector<WorldCollision> &col) {
 172         // determine displacement for each cardinal axis and move entity accordingly
 173         glm::vec3 min_disp(0.0f);
 174         glm::vec3 max_disp(0.0f);
 175         for (const WorldCollision &c : col) {
 176                 if (!c.Blocks()) continue;
 177                 glm::vec3 local_disp(c.normal * c.depth);
 178                 // swap if neccessary (normal may point away from the entity)
 179                 if (dot(c.normal, e.Position() - c.BlockCoords()) < 0) {
 180                         local_disp *= -1;
 181                 }
 182                 min_disp = min(min_disp, local_disp);
 183                 max_disp = max(max_disp, local_disp);
 184         }
 185         // for each axis
 186         // if only one direction is set, use that as the final
 187         // if both directions are set, use average
 188         glm::vec3 final_disp(0.0f);
 189         for (int axis = 0; axis < 3; ++axis) {
 190                 if (std::abs(min_disp[axis]) > std::numeric_limits<float>::epsilon()) {
 191                         if (std::abs(max_disp[axis]) > std::numeric_limits<float>::epsilon()) {
 192                                 final_disp[axis] = (min_disp[axis] + max_disp[axis]) * 0.5f;
 193                         } else {
 194                                 final_disp[axis] = min_disp[axis];
 195                         }
 196                 } else if (std::abs(max_disp[axis]) > std::numeric_limits<float>::epsilon()) {
 197                         final_disp[axis] = max_disp[axis];
 198                 }
 199         }
 200         e.Move(final_disp);
 201 }
 202
 203
 204 void World::Render(Viewport &viewport) {
 205         viewport.WorldPosition(player->Transform(player->ChunkCoords()));
 206
 207         BlockLighting &chunk_prog = viewport.ChunkProgram();
 208         chunk_prog.SetTexture(block_tex);
 209         chunk_prog.SetFogDensity(fog_density);
 210
 211         for (Chunk &chunk : chunks.Loaded()) {
 212                 glm::mat4 m(chunk.Transform(player->ChunkCoords()));
 213                 chunk_prog.SetM(m);
 214                 glm::mat4 mvp(chunk_prog.GetVP() * m);
 215                 if (!CullTest(Chunk::Bounds(), mvp)) {
 216                         chunk.Draw();
 217                 }
 218         }
 219
 220         DirectionalLighting &entity_prog = viewport.EntityProgram();
 221         entity_prog.SetLightDirection(light_direction);
 222         entity_prog.SetFogDensity(fog_density);
 223
 224         for (Entity &entity : entities) {
 225                 entity.Render(entity.ChunkTransform(player->ChunkCoords()), entity_prog);
 226         }
 227 }
 228
 229 }