src/world/World.cpp

   1 #include "World.hpp"
   2
   3 #include "WorldCollision.hpp"
   4 #include "../app/Assets.hpp"
   5 #include "../app/TextureIndex.hpp"
   6 #include "../graphics/Format.hpp"
   7 #include "../graphics/Viewport.hpp"
   8
   9 #include <limits>
  10 #include <glm/gtx/io.hpp>
  11 #include <glm/gtx/transform.hpp>
  12
  13
  14 namespace blank {
  15
  16 World::World(const Assets &assets, const Config &config, const WorldSave &save)
  17 : block_type()
  18 , block_tex()
  19 , generate(config.gen)
  20 , chunks(config.load, block_type, generate, save)
  21 , player()
  22 , entities()
  23 , light_direction(config.light_direction)
  24 , fog_density(config.fog_density) {
  25         TextureIndex tex_index;
  26         assets.LoadBlockTypes("default", block_type, tex_index);
  27
  28         block_tex.Bind();
  29         assets.LoadTextures(tex_index, block_tex);
  30         block_tex.FilterNearest();
  31
  32         generate.Space(0);
  33         generate.Light(13);
  34         generate.Solids({ 1, 4, 7, 10 });
  35
  36         player = &AddEntity();
  37         player->Name("player");
  38         player->Bounds({ { -0.5f, -0.5f, -0.5f }, { 0.5f, 0.5f, 0.5f } });
  39         player->WorldCollidable(true);
  40         player->Position(config.spawn);
  41
  42         chunks.QueueSurrounding(player->ChunkCoords());
  43 }
  44
  45
  46 namespace {
  47
  48 struct Candidate {
  49         Chunk *chunk;
  50         float dist;
  51 };
  52
  53 std::vector<Candidate> candidates;
  54
  55 }
  56
  57 bool World::Intersection(
  58         const Ray &ray,
  59         const glm::mat4 &M,
  60         Chunk *&chunk,
  61         int &blkid,
  62         float &dist,
  63         glm::vec3 &normal
  64 ) {
  65         candidates.clear();
  66
  67         for (Chunk &cur_chunk : chunks.Loaded()) {
  68                 float cur_dist;
  69                 if (cur_chunk.Intersection(ray, M * cur_chunk.Transform(player->ChunkCoords()), cur_dist)) {
  70                         candidates.push_back({ &cur_chunk, cur_dist });
  71                 }
  72         }
  73
  74         if (candidates.empty()) return false;
  75
  76         chunk = nullptr;
  77         dist = std::numeric_limits<float>::infinity();
  78         blkid = -1;
  79
  80         for (Candidate &cand : candidates) {
  81                 if (cand.dist > dist) continue;
  82                 int cur_blkid;
  83                 float cur_dist;
  84                 glm::vec3 cur_normal;
  85                 if (cand.chunk->Intersection(ray, M * cand.chunk->Transform(player->ChunkCoords()), cur_blkid, cur_dist, cur_normal)) {
  86                         if (cur_dist < dist) {
  87                                 chunk = cand.chunk;
  88                                 blkid = cur_blkid;
  89                                 dist = cur_dist;
  90                                 normal = cur_normal;
  91                         }
  92                 }
  93         }
  94
  95         return chunk;
  96 }
  97
  98 bool World::Intersection(const Entity &e, std::vector<WorldCollision> &col) {
  99         AABB box = e.Bounds();
 100         glm::mat4 M = e.Transform(player->ChunkCoords());
 101         bool any = false;
 102         for (Chunk &cur_chunk : chunks.Loaded()) {
 103                 if (manhattan_radius(cur_chunk.Position() - e.ChunkCoords()) > 1) {
 104                         // chunk is not one of the 3x3x3 surrounding the entity
 105                         // since there's no entity which can extent over 16 blocks, they can be skipped
 106                         continue;
 107                 }
 108                 if (cur_chunk.Intersection(box, M, cur_chunk.Transform(player->ChunkCoords()), col)) {
 109                         any = true;
 110                 }
 111         }
 112         return any;
 113 }
 114
 115
 116 Chunk &World::PlayerChunk() {
 117         return chunks.ForceLoad(player->ChunkCoords());
 118 }
 119
 120 Chunk &World::Next(const Chunk &to, const glm::ivec3 &dir) {
 121         const Chunk::Pos tgt_pos = to.Position() + dir;
 122         return chunks.ForceLoad(tgt_pos);
 123 }
 124
 125
 126 namespace {
 127
 128 std::vector<WorldCollision> col;
 129
 130 }
 131
 132 void World::Update(int dt) {
 133         for (Entity &entity : entities) {
 134                 entity.Update(dt);
 135         }
 136         for (Entity &entity : entities) {
 137                 col.clear();
 138                 if (entity.WorldCollidable() && Intersection(entity, col)) {
 139                         // entity collides with the world
 140                         Resolve(entity, col);
 141                 }
 142         }
 143         for (auto iter = entities.begin(), end = entities.end(); iter != end;) {
 144                 if (iter->CanRemove()) {
 145                         iter = entities.erase(iter);
 146                 } else {
 147                         ++iter;
 148                 }
 149         }
 150         chunks.Rebase(player->ChunkCoords());
 151         chunks.Update(dt);
 152 }
 153
 154 void World::Resolve(Entity &e, std::vector<WorldCollision> &col) {
 155         // determine displacement for each cardinal axis and move entity accordingly
 156         glm::vec3 min_disp(0.0f);
 157         glm::vec3 max_disp(0.0f);
 158         for (const WorldCollision &c : col) {
 159                 if (!c.Blocks()) continue;
 160                 glm::vec3 local_disp(c.normal * c.depth);
 161                 // swap if neccessary (normal may point away from the entity)
 162                 if (dot(c.normal, e.Position() - c.BlockCoords()) < 0) {
 163                         local_disp *= -1;
 164                 }
 165                 min_disp = min(min_disp, local_disp);
 166                 max_disp = max(max_disp, local_disp);
 167         }
 168         // for each axis
 169         // if only one direction is set, use that as the final
 170         // if both directions are set, use average
 171         glm::vec3 final_disp(0.0f);
 172         for (int axis = 0; axis < 3; ++axis) {
 173                 if (std::abs(min_disp[axis]) > std::numeric_limits<float>::epsilon()) {
 174                         if (std::abs(max_disp[axis]) > std::numeric_limits<float>::epsilon()) {
 175                                 final_disp[axis] = (min_disp[axis] + max_disp[axis]) * 0.5f;
 176                         } else {
 177                                 final_disp[axis] = min_disp[axis];
 178                         }
 179                 } else if (std::abs(max_disp[axis]) > std::numeric_limits<float>::epsilon()) {
 180                         final_disp[axis] = max_disp[axis];
 181                 }
 182         }
 183         e.Move(final_disp);
 184 }
 185
 186
 187 void World::Render(Viewport &viewport) {
 188         viewport.WorldPosition(player->Transform(player->ChunkCoords()));
 189
 190         BlockLighting &chunk_prog = viewport.ChunkProgram();
 191         chunk_prog.SetTexture(block_tex);
 192         chunk_prog.SetFogDensity(fog_density);
 193
 194         for (Chunk &chunk : chunks.Loaded()) {
 195                 glm::mat4 m(chunk.Transform(player->ChunkCoords()));
 196                 chunk_prog.SetM(m);
 197                 glm::mat4 mvp(chunk_prog.GetVP() * m);
 198                 if (!CullTest(Chunk::Bounds(), mvp)) {
 199                         chunk.Draw();
 200                 }
 201         }
 202
 203         DirectionalLighting &entity_prog = viewport.EntityProgram();
 204         entity_prog.SetLightDirection(light_direction);
 205         entity_prog.SetFogDensity(fog_density);
 206
 207         for (Entity &entity : entities) {
 208                 entity.Render(entity.ChunkTransform(player->ChunkCoords()), entity_prog);
 209         }
 210 }
 211
 212 }