src/world/World.cpp

   1 #include "World.hpp"
   2
   3 #include "WorldCollision.hpp"
   4 #include "../graphics/Viewport.hpp"
   5
   6 #include <iostream>
   7 #include <limits>
   8 #include <glm/gtx/io.hpp>
   9 #include <glm/gtx/transform.hpp>
  10
  11
  12 namespace blank {
  13
  14 World::World(const Config &config)
  15 : blockType()
  16 , blockShape({{ -0.5f, -0.5f, -0.5f }, { 0.5f, 0.5f, 0.5f }})
  17 , stairShape({{ -0.5f, -0.5f, -0.5f }, { 0.5f, 0.5f, 0.5f }}, { 0.0f, 0.0f })
  18 , slabShape({{ -0.5f, -0.5f, -0.5f }, { 0.5f, 0.0f, 0.5f }})
  19 , generate(config.gen)
  20 , chunks(config.load, blockType, generate)
  21 , player()
  22 , entities()
  23 , light_direction(config.light_direction)
  24 , fog_density(config.fog_density) {
  25         BlockType::Faces block_fill = {  true,  true,  true,  true,  true,  true };
  26         BlockType::Faces slab_fill  = { false,  true, false, false, false, false };
  27         BlockType::Faces stair_fill = { false,  true, false, false, false,  true };
  28
  29         { // white block
  30                 BlockType type(true, { 1.0f, 1.0f, 1.0f }, &blockShape);
  31                 type.label = "White Block";
  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.label = "White Slab";
  41                 type.block_light = true;
  42                 type.collision = true;
  43                 type.collide_block = true;
  44                 type.fill = slab_fill;
  45                 blockType.Add(type);
  46         }
  47         { // white stair
  48                 BlockType type(true, { 1.0f, 1.0f, 1.0f }, &stairShape);
  49                 type.label = "White Stair";
  50                 type.block_light = true;
  51                 type.collision = true;
  52                 type.collide_block = true;
  53                 type.fill = stair_fill;
  54                 blockType.Add(type);
  55         }
  56
  57         { // red block
  58                 BlockType type(true, { 1.0f, 0.0f, 0.0f }, &blockShape);
  59                 type.label = "Red Block";
  60                 type.block_light = true;
  61                 type.collision = true;
  62                 type.collide_block = true;
  63                 type.fill = block_fill;
  64                 blockType.Add(type);
  65         }
  66         { // red slab
  67                 BlockType type(true, { 1.0f, 0.0f, 0.0f }, &slabShape);
  68                 type.label = "Red Slab";
  69                 type.block_light = true;
  70                 type.collision = true;
  71                 type.collide_block = true;
  72                 type.fill = slab_fill;
  73                 blockType.Add(type);
  74         }
  75         { // red stair
  76                 BlockType type(true, { 1.0f, 0.0f, 0.0f }, &stairShape);
  77                 type.label = "Red Stair";
  78                 type.block_light = true;
  79                 type.collision = true;
  80                 type.collide_block = true;
  81                 type.fill = stair_fill;
  82                 blockType.Add(type);
  83         }
  84
  85         { // green block
  86                 BlockType type(true, { 0.0f, 1.0f, 0.0f }, &blockShape);
  87                 type.label = "Green Block";
  88                 type.block_light = true;
  89                 type.collision = true;
  90                 type.collide_block = true;
  91                 type.fill = block_fill;
  92                 blockType.Add(type);
  93         }
  94         { // green slab
  95                 BlockType type(true, { 0.0f, 1.0f, 0.0f }, &slabShape);
  96                 type.label = "Green Slab";
  97                 type.block_light = true;
  98                 type.collision = true;
  99                 type.collide_block = true;
 100                 type.fill = slab_fill;
 101                 blockType.Add(type);
 102         }
 103         { // green stair
 104                 BlockType type(true, { 0.0f, 1.0f, 0.0f }, &stairShape);
 105                 type.label = "Green Stair";
 106                 type.block_light = true;
 107                 type.collision = true;
 108                 type.collide_block = true;
 109                 type.fill = stair_fill;
 110                 blockType.Add(type);
 111         }
 112
 113         { // blue block
 114                 BlockType type(true, { 0.0f, 0.0f, 1.0f }, &blockShape);
 115                 type.label = "Blue Block";
 116                 type.block_light = true;
 117                 type.collision = true;
 118                 type.collide_block = true;
 119                 type.fill = block_fill;
 120                 blockType.Add(type);
 121         }
 122         { // blue slab
 123                 BlockType type(true, { 0.0f, 0.0f, 1.0f }, &slabShape);
 124                 type.label = "Blue Slab";
 125                 type.block_light = true;
 126                 type.collision = true;
 127                 type.collide_block = true;
 128                 type.fill = slab_fill;
 129                 blockType.Add(type);
 130         }
 131         { // blue stair
 132                 BlockType type(true, { 0.0f, 0.0f, 1.0f }, &stairShape);
 133                 type.label = "Blue Stair";
 134                 type.block_light = true;
 135                 type.collision = true;
 136                 type.collide_block = true;
 137                 type.fill = stair_fill;
 138                 blockType.Add(type);
 139         }
 140
 141         { // glowing yellow block
 142                 BlockType type(true, { 1.0f, 1.0f, 0.0f }, &blockShape);
 143                 type.label = "Light";
 144                 type.luminosity = 15;
 145                 type.block_light = true;
 146                 type.collision = true;
 147                 type.collide_block = true;
 148                 type.fill = block_fill;
 149                 blockType.Add(type);
 150         }
 151
 152         generate.Space(0);
 153         generate.Light(13);
 154         generate.Solids({ 1, 4, 7, 10 });
 155
 156         player = &AddEntity();
 157         player->Name("player");
 158         player->Bounds({ { -0.5f, -0.5f, -0.5f }, { 0.5f, 0.5f, 0.5f } });
 159         player->WorldCollidable(true);
 160         player->Position(config.spawn);
 161
 162         chunks.GenerateSurrounding(player->ChunkCoords());
 163 }
 164
 165
 166 namespace {
 167
 168 struct Candidate {
 169         Chunk *chunk;
 170         float dist;
 171 };
 172
 173 std::vector<Candidate> candidates;
 174
 175 }
 176
 177 bool World::Intersection(
 178         const Ray &ray,
 179         const glm::mat4 &M,
 180         Chunk *&chunk,
 181         int &blkid,
 182         float &dist,
 183         glm::vec3 &normal
 184 ) {
 185         candidates.clear();
 186
 187         for (Chunk &cur_chunk : chunks.Loaded()) {
 188                 float cur_dist;
 189                 if (cur_chunk.Intersection(ray, M * cur_chunk.Transform(player->ChunkCoords()), cur_dist)) {
 190                         candidates.push_back({ &cur_chunk, cur_dist });
 191                 }
 192         }
 193
 194         if (candidates.empty()) return false;
 195
 196         chunk = nullptr;
 197         dist = std::numeric_limits<float>::infinity();
 198         blkid = -1;
 199
 200         for (Candidate &cand : candidates) {
 201                 if (cand.dist > dist) continue;
 202                 int cur_blkid;
 203                 float cur_dist;
 204                 glm::vec3 cur_normal;
 205                 if (cand.chunk->Intersection(ray, M * cand.chunk->Transform(player->ChunkCoords()), cur_blkid, cur_dist, cur_normal)) {
 206                         if (cur_dist < dist) {
 207                                 chunk = cand.chunk;
 208                                 blkid = cur_blkid;
 209                                 dist = cur_dist;
 210                                 normal = cur_normal;
 211                         }
 212                 }
 213         }
 214
 215         return chunk;
 216 }
 217
 218 bool World::Intersection(const Entity &e, std::vector<WorldCollision> &col) {
 219         AABB box = e.Bounds();
 220         glm::mat4 M = e.Transform(player->ChunkCoords());
 221         bool any = false;
 222         // TODO: this only needs to check the chunks surrounding the entity's chunk position
 223         //       need find out if that is quicker than the rough chunk bounds test
 224         for (Chunk &cur_chunk : chunks.Loaded()) {
 225                 if (cur_chunk.Intersection(box, M, cur_chunk.Transform(player->ChunkCoords()), col)) {
 226                         any = true;
 227                 }
 228         }
 229         return any;
 230 }
 231
 232
 233 Chunk &World::PlayerChunk() {
 234         return chunks.ForceLoad(player->ChunkCoords());
 235 }
 236
 237 Chunk &World::Next(const Chunk &to, const glm::tvec3<int> &dir) {
 238         const Chunk::Pos tgt_pos = to.Position() + dir;
 239         return chunks.ForceLoad(tgt_pos);
 240 }
 241
 242
 243 namespace {
 244
 245 std::vector<WorldCollision> col;
 246
 247 }
 248
 249 void World::Update(int dt) {
 250         for (Entity &entity : entities) {
 251                 entity.Update(dt);
 252         }
 253         for (Entity &entity : entities) {
 254                 col.clear();
 255                 if (entity.WorldCollidable() && Intersection(entity, col)) {
 256                         // entity collides with the world
 257                         Resolve(entity, col);
 258                 }
 259         }
 260         chunks.Rebase(player->ChunkCoords());
 261         chunks.Update(dt);
 262 }
 263
 264 void World::Resolve(Entity &e, std::vector<WorldCollision> &col) {
 265         // determine displacement for each cardinal axis and move entity accordingly
 266         glm::vec3 min_disp(0.0f);
 267         glm::vec3 max_disp(0.0f);
 268         for (const WorldCollision &c : col) {
 269                 if (!c.Blocks()) continue;
 270                 glm::vec3 local_disp(c.normal * c.depth);
 271                 // swap if neccessary (normal may point away from the entity)
 272                 if (dot(c.normal, e.Position() - c.BlockCoords()) < 0) {
 273                         local_disp *= -1;
 274                 }
 275                 min_disp = min(min_disp, local_disp);
 276                 max_disp = max(max_disp, local_disp);
 277         }
 278         // for each axis
 279         // if only one direction is set, use that as the final
 280         // if both directions are set, use average
 281         glm::vec3 final_disp(0.0f);
 282         for (int axis = 0; axis < 3; ++axis) {
 283                 if (std::abs(min_disp[axis]) > std::numeric_limits<float>::epsilon()) {
 284                         if (std::abs(max_disp[axis]) > std::numeric_limits<float>::epsilon()) {
 285                                 final_disp[axis] = (min_disp[axis] + max_disp[axis]) * 0.5f;
 286                         } else {
 287                                 final_disp[axis] = min_disp[axis];
 288                         }
 289                 } else if (std::abs(max_disp[axis]) > std::numeric_limits<float>::epsilon()) {
 290                         final_disp[axis] = max_disp[axis];
 291                 }
 292         }
 293         e.Move(final_disp);
 294 }
 295
 296
 297 void World::Render(Viewport &viewport) {
 298         viewport.WorldPosition(player->Transform(player->ChunkCoords()));
 299
 300         BlockLighting &chunk_prog = viewport.ChunkProgram();
 301         chunk_prog.SetFogDensity(fog_density);
 302
 303         for (Chunk &chunk : chunks.Loaded()) {
 304                 glm::mat4 m(chunk.Transform(player->ChunkCoords()));
 305                 chunk_prog.SetM(m);
 306                 glm::mat4 mvp(chunk_prog.GetVP() * m);
 307                 if (!CullTest(Chunk::Bounds(), mvp)) {
 308                         chunk.Draw();
 309                 }
 310         }
 311
 312         DirectionalLighting &entity_prog = viewport.EntityProgram();
 313         entity_prog.SetLightDirection(light_direction);
 314         entity_prog.SetFogDensity(fog_density);
 315
 316         for (Entity &entity : entities) {
 317                 if (entity.HasShape()) {
 318                         entity_prog.SetM(entity.Transform(player->ChunkCoords()));
 319                         entity.Draw();
 320                 }
 321         }
 322 }
 323
 324 }