src/world/World.cpp

   1 #include "World.hpp"
   2
   3 #include "WorldCollision.hpp"
   4 #include "../app/Assets.hpp"
   5 #include "../graphics/Format.hpp"
   6 #include "../graphics/Viewport.hpp"
   7
   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 Assets &assets, const Config &config, const WorldSave &save)
  16 : block_type()
  17 , block_tex()
  18 , generate(config.gen)
  19 , chunks(config.load, block_type, generate, save)
  20 , player()
  21 , entities()
  22 , light_direction(config.light_direction)
  23 , fog_density(config.fog_density) {
  24         block_tex.Bind();
  25         block_tex.Reserve(16, 16, 4, Format());
  26         assets.LoadTexture("debug", block_tex, 0);
  27         assets.LoadTexture("rock-1", block_tex, 1);
  28         assets.LoadTexture("rock-2", block_tex, 2);
  29         assets.LoadTexture("rock-3", block_tex, 3);
  30         block_tex.FilterNearest();
  31
  32         assets.LoadBlockTypes("default", block_type);
  33
  34         generate.Space(0);
  35         generate.Light(13);
  36         generate.Solids({ 1, 4, 7, 10 });
  37
  38         player = &AddEntity();
  39         player->Name("player");
  40         player->Bounds({ { -0.5f, -0.5f, -0.5f }, { 0.5f, 0.5f, 0.5f } });
  41         player->WorldCollidable(true);
  42         player->Position(config.spawn);
  43
  44         chunks.QueueSurrounding(player->ChunkCoords());
  45 }
  46
  47
  48 namespace {
  49
  50 struct Candidate {
  51         Chunk *chunk;
  52         float dist;
  53 };
  54
  55 std::vector<Candidate> candidates;
  56
  57 }
  58
  59 bool World::Intersection(
  60         const Ray &ray,
  61         const glm::mat4 &M,
  62         Chunk *&chunk,
  63         int &blkid,
  64         float &dist,
  65         glm::vec3 &normal
  66 ) {
  67         candidates.clear();
  68
  69         for (Chunk &cur_chunk : chunks.Loaded()) {
  70                 float cur_dist;
  71                 if (cur_chunk.Intersection(ray, M * cur_chunk.Transform(player->ChunkCoords()), cur_dist)) {
  72                         candidates.push_back({ &cur_chunk, cur_dist });
  73                 }
  74         }
  75
  76         if (candidates.empty()) return false;
  77
  78         chunk = nullptr;
  79         dist = std::numeric_limits<float>::infinity();
  80         blkid = -1;
  81
  82         for (Candidate &cand : candidates) {
  83                 if (cand.dist > dist) continue;
  84                 int cur_blkid;
  85                 float cur_dist;
  86                 glm::vec3 cur_normal;
  87                 if (cand.chunk->Intersection(ray, M * cand.chunk->Transform(player->ChunkCoords()), cur_blkid, cur_dist, cur_normal)) {
  88                         if (cur_dist < dist) {
  89                                 chunk = cand.chunk;
  90                                 blkid = cur_blkid;
  91                                 dist = cur_dist;
  92                                 normal = cur_normal;
  93                         }
  94                 }
  95         }
  96
  97         return chunk;
  98 }
  99
 100 bool World::Intersection(const Entity &e, std::vector<WorldCollision> &col) {
 101         AABB box = e.Bounds();
 102         glm::mat4 M = e.Transform(player->ChunkCoords());
 103         bool any = false;
 104         // TODO: this only needs to check the chunks surrounding the entity's chunk position
 105         //       need find out if that is quicker than the rough chunk bounds test
 106         for (Chunk &cur_chunk : chunks.Loaded()) {
 107                 if (cur_chunk.Intersection(box, M, cur_chunk.Transform(player->ChunkCoords()), col)) {
 108                         any = true;
 109                 }
 110         }
 111         return any;
 112 }
 113
 114
 115 Chunk &World::PlayerChunk() {
 116         return chunks.ForceLoad(player->ChunkCoords());
 117 }
 118
 119 Chunk &World::Next(const Chunk &to, const glm::ivec3 &dir) {
 120         const Chunk::Pos tgt_pos = to.Position() + dir;
 121         return chunks.ForceLoad(tgt_pos);
 122 }
 123
 124
 125 namespace {
 126
 127 std::vector<WorldCollision> col;
 128
 129 }
 130
 131 void World::Update(int dt) {
 132         for (Entity &entity : entities) {
 133                 entity.Update(dt);
 134         }
 135         for (Entity &entity : entities) {
 136                 col.clear();
 137                 if (entity.WorldCollidable() && Intersection(entity, col)) {
 138                         // entity collides with the world
 139                         Resolve(entity, col);
 140                 }
 141         }
 142         for (auto iter = entities.begin(), end = entities.end(); iter != end;) {
 143                 if (iter->CanRemove()) {
 144                         iter = entities.erase(iter);
 145                 } else {
 146                         ++iter;
 147                 }
 148         }
 149         chunks.Rebase(player->ChunkCoords());
 150         chunks.Update(dt);
 151 }
 152
 153 void World::Resolve(Entity &e, std::vector<WorldCollision> &col) {
 154         // determine displacement for each cardinal axis and move entity accordingly
 155         glm::vec3 min_disp(0.0f);
 156         glm::vec3 max_disp(0.0f);
 157         for (const WorldCollision &c : col) {
 158                 if (!c.Blocks()) continue;
 159                 glm::vec3 local_disp(c.normal * c.depth);
 160                 // swap if neccessary (normal may point away from the entity)
 161                 if (dot(c.normal, e.Position() - c.BlockCoords()) < 0) {
 162                         local_disp *= -1;
 163                 }
 164                 min_disp = min(min_disp, local_disp);
 165                 max_disp = max(max_disp, local_disp);
 166         }
 167         // for each axis
 168         // if only one direction is set, use that as the final
 169         // if both directions are set, use average
 170         glm::vec3 final_disp(0.0f);
 171         for (int axis = 0; axis < 3; ++axis) {
 172                 if (std::abs(min_disp[axis]) > std::numeric_limits<float>::epsilon()) {
 173                         if (std::abs(max_disp[axis]) > std::numeric_limits<float>::epsilon()) {
 174                                 final_disp[axis] = (min_disp[axis] + max_disp[axis]) * 0.5f;
 175                         } else {
 176                                 final_disp[axis] = min_disp[axis];
 177                         }
 178                 } else if (std::abs(max_disp[axis]) > std::numeric_limits<float>::epsilon()) {
 179                         final_disp[axis] = max_disp[axis];
 180                 }
 181         }
 182         e.Move(final_disp);
 183 }
 184
 185
 186 void World::Render(Viewport &viewport) {
 187         viewport.WorldPosition(player->Transform(player->ChunkCoords()));
 188
 189         BlockLighting &chunk_prog = viewport.ChunkProgram();
 190         chunk_prog.SetTexture(block_tex);
 191         chunk_prog.SetFogDensity(fog_density);
 192
 193         for (Chunk &chunk : chunks.Loaded()) {
 194                 glm::mat4 m(chunk.Transform(player->ChunkCoords()));
 195                 chunk_prog.SetM(m);
 196                 glm::mat4 mvp(chunk_prog.GetVP() * m);
 197                 if (!CullTest(Chunk::Bounds(), mvp)) {
 198                         chunk.Draw();
 199                 }
 200         }
 201
 202         DirectionalLighting &entity_prog = viewport.EntityProgram();
 203         entity_prog.SetLightDirection(light_direction);
 204         entity_prog.SetFogDensity(fog_density);
 205
 206         for (Entity &entity : entities) {
 207                 entity.Render(entity.ChunkTransform(player->ChunkCoords()), entity_prog);
 208         }
 209 }
 210
 211 }