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 : 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 , block_tex()
  21 , generate(config.gen)
  22 , chunks(config.load, blockType, generate, save)
  23 , player()
  24 , entities()
  25 , light_direction(config.light_direction)
  26 , fog_density(config.fog_density) {
  27         BlockType::Faces block_fill = {  true,  true,  true,  true,  true,  true };
  28         BlockType::Faces slab_fill  = { false,  true, false, false, false, false };
  29         BlockType::Faces stair_fill = { false,  true, false, false, false,  true };
  30
  31         block_tex.Bind();
  32         block_tex.Reserve(16, 16, 4, Format());
  33         assets.LoadTexture("debug", block_tex, 0);
  34         assets.LoadTexture("rock-1", block_tex, 1);
  35         assets.LoadTexture("rock-2", block_tex, 2);
  36         assets.LoadTexture("rock-3", block_tex, 3);
  37         block_tex.FilterNearest();
  38
  39         { // white block
  40                 BlockType type(true, { 1.0f, 1.0f, 1.0f }, &blockShape);
  41                 type.texture = 1;
  42                 type.label = "White Block";
  43                 type.block_light = true;
  44                 type.collision = true;
  45                 type.collide_block = true;
  46                 type.fill = block_fill;
  47                 blockType.Add(type);
  48         }
  49         { // white slab
  50                 BlockType type(true, { 1.0f, 1.0f, 1.0f }, &slabShape);
  51                 type.texture = 1;
  52                 type.label = "White Slab";
  53                 type.block_light = true;
  54                 type.collision = true;
  55                 type.collide_block = true;
  56                 type.fill = slab_fill;
  57                 blockType.Add(type);
  58         }
  59         { // white stair
  60                 BlockType type(true, { 1.0f, 1.0f, 1.0f }, &stairShape);
  61                 type.texture = 1;
  62                 type.label = "White Stair";
  63                 type.block_light = true;
  64                 type.collision = true;
  65                 type.collide_block = true;
  66                 type.fill = stair_fill;
  67                 blockType.Add(type);
  68         }
  69
  70         { // red block
  71                 BlockType type(true, { 1.0f, 0.0f, 0.0f }, &blockShape);
  72                 type.texture = 3;
  73                 type.label = "Red Block";
  74                 type.block_light = true;
  75                 type.collision = true;
  76                 type.collide_block = true;
  77                 type.fill = block_fill;
  78                 blockType.Add(type);
  79         }
  80         { // red slab
  81                 BlockType type(true, { 1.0f, 0.0f, 0.0f }, &slabShape);
  82                 type.texture = 3;
  83                 type.label = "Red Slab";
  84                 type.block_light = true;
  85                 type.collision = true;
  86                 type.collide_block = true;
  87                 type.fill = slab_fill;
  88                 blockType.Add(type);
  89         }
  90         { // red stair
  91                 BlockType type(true, { 1.0f, 0.0f, 0.0f }, &stairShape);
  92                 type.texture = 3;
  93                 type.label = "Red Stair";
  94                 type.block_light = true;
  95                 type.collision = true;
  96                 type.collide_block = true;
  97                 type.fill = stair_fill;
  98                 blockType.Add(type);
  99         }
 100
 101         { // green block
 102                 BlockType type(true, { 0.0f, 1.0f, 0.0f }, &blockShape);
 103                 type.texture = 1;
 104                 type.label = "Green Block";
 105                 type.block_light = true;
 106                 type.collision = true;
 107                 type.collide_block = true;
 108                 type.fill = block_fill;
 109                 blockType.Add(type);
 110         }
 111         { // green slab
 112                 BlockType type(true, { 0.0f, 1.0f, 0.0f }, &slabShape);
 113                 type.texture = 1;
 114                 type.label = "Green Slab";
 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         { // green stair
 122                 BlockType type(true, { 0.0f, 1.0f, 0.0f }, &stairShape);
 123                 type.texture = 1;
 124                 type.label = "Green Stair";
 125                 type.block_light = true;
 126                 type.collision = true;
 127                 type.collide_block = true;
 128                 type.fill = stair_fill;
 129                 blockType.Add(type);
 130         }
 131
 132         { // blue block
 133                 BlockType type(true, { 0.0f, 0.0f, 1.0f }, &blockShape);
 134                 type.texture = 3;
 135                 type.label = "Blue Block";
 136                 type.block_light = true;
 137                 type.collision = true;
 138                 type.collide_block = true;
 139                 type.fill = block_fill;
 140                 blockType.Add(type);
 141         }
 142         { // blue slab
 143                 BlockType type(true, { 0.0f, 0.0f, 1.0f }, &slabShape);
 144                 type.texture = 3;
 145                 type.label = "Blue Slab";
 146                 type.block_light = true;
 147                 type.collision = true;
 148                 type.collide_block = true;
 149                 type.fill = slab_fill;
 150                 blockType.Add(type);
 151         }
 152         { // blue stair
 153                 BlockType type(true, { 0.0f, 0.0f, 1.0f }, &stairShape);
 154                 type.texture = 3;
 155                 type.label = "Blue Stair";
 156                 type.block_light = true;
 157                 type.collision = true;
 158                 type.collide_block = true;
 159                 type.fill = stair_fill;
 160                 blockType.Add(type);
 161         }
 162
 163         { // glowing yellow block
 164                 BlockType type(true, { 1.0f, 1.0f, 0.0f }, &blockShape);
 165                 type.texture = 2;
 166                 type.label = "Light";
 167                 type.luminosity = 15;
 168                 type.block_light = true;
 169                 type.collision = true;
 170                 type.collide_block = true;
 171                 type.fill = block_fill;
 172                 blockType.Add(type);
 173         }
 174
 175         { // the mysterious debug cube
 176                 BlockType type(true, { 1.0f, 1.0f, 1.0f }, &blockShape);
 177                 type.texture = 0;
 178                 type.label = "Debug Cube";
 179                 type.luminosity = 0;
 180                 type.block_light = true;
 181                 type.collision = true;
 182                 type.collide_block = true;
 183                 type.fill = block_fill;
 184                 blockType.Add(type);
 185         }
 186
 187         generate.Space(0);
 188         generate.Light(13);
 189         generate.Solids({ 1, 4, 7, 10 });
 190
 191         player = &AddEntity();
 192         player->Name("player");
 193         player->Bounds({ { -0.5f, -0.5f, -0.5f }, { 0.5f, 0.5f, 0.5f } });
 194         player->WorldCollidable(true);
 195         player->Position(config.spawn);
 196
 197         chunks.QueueSurrounding(player->ChunkCoords());
 198 }
 199
 200
 201 namespace {
 202
 203 struct Candidate {
 204         Chunk *chunk;
 205         float dist;
 206 };
 207
 208 std::vector<Candidate> candidates;
 209
 210 }
 211
 212 bool World::Intersection(
 213         const Ray &ray,
 214         const glm::mat4 &M,
 215         Chunk *&chunk,
 216         int &blkid,
 217         float &dist,
 218         glm::vec3 &normal
 219 ) {
 220         candidates.clear();
 221
 222         for (Chunk &cur_chunk : chunks.Loaded()) {
 223                 float cur_dist;
 224                 if (cur_chunk.Intersection(ray, M * cur_chunk.Transform(player->ChunkCoords()), cur_dist)) {
 225                         candidates.push_back({ &cur_chunk, cur_dist });
 226                 }
 227         }
 228
 229         if (candidates.empty()) return false;
 230
 231         chunk = nullptr;
 232         dist = std::numeric_limits<float>::infinity();
 233         blkid = -1;
 234
 235         for (Candidate &cand : candidates) {
 236                 if (cand.dist > dist) continue;
 237                 int cur_blkid;
 238                 float cur_dist;
 239                 glm::vec3 cur_normal;
 240                 if (cand.chunk->Intersection(ray, M * cand.chunk->Transform(player->ChunkCoords()), cur_blkid, cur_dist, cur_normal)) {
 241                         if (cur_dist < dist) {
 242                                 chunk = cand.chunk;
 243                                 blkid = cur_blkid;
 244                                 dist = cur_dist;
 245                                 normal = cur_normal;
 246                         }
 247                 }
 248         }
 249
 250         return chunk;
 251 }
 252
 253 bool World::Intersection(const Entity &e, std::vector<WorldCollision> &col) {
 254         AABB box = e.Bounds();
 255         glm::mat4 M = e.Transform(player->ChunkCoords());
 256         bool any = false;
 257         // TODO: this only needs to check the chunks surrounding the entity's chunk position
 258         //       need find out if that is quicker than the rough chunk bounds test
 259         for (Chunk &cur_chunk : chunks.Loaded()) {
 260                 if (cur_chunk.Intersection(box, M, cur_chunk.Transform(player->ChunkCoords()), col)) {
 261                         any = true;
 262                 }
 263         }
 264         return any;
 265 }
 266
 267
 268 Chunk &World::PlayerChunk() {
 269         return chunks.ForceLoad(player->ChunkCoords());
 270 }
 271
 272 Chunk &World::Next(const Chunk &to, const glm::ivec3 &dir) {
 273         const Chunk::Pos tgt_pos = to.Position() + dir;
 274         return chunks.ForceLoad(tgt_pos);
 275 }
 276
 277
 278 namespace {
 279
 280 std::vector<WorldCollision> col;
 281
 282 }
 283
 284 void World::Update(int dt) {
 285         for (Entity &entity : entities) {
 286                 entity.Update(dt);
 287         }
 288         for (Entity &entity : entities) {
 289                 col.clear();
 290                 if (entity.WorldCollidable() && Intersection(entity, col)) {
 291                         // entity collides with the world
 292                         Resolve(entity, col);
 293                 }
 294         }
 295         for (auto iter = entities.begin(), end = entities.end(); iter != end;) {
 296                 if (iter->CanRemove()) {
 297                         iter = entities.erase(iter);
 298                 } else {
 299                         ++iter;
 300                 }
 301         }
 302         chunks.Rebase(player->ChunkCoords());
 303         chunks.Update(dt);
 304 }
 305
 306 void World::Resolve(Entity &e, std::vector<WorldCollision> &col) {
 307         // determine displacement for each cardinal axis and move entity accordingly
 308         glm::vec3 min_disp(0.0f);
 309         glm::vec3 max_disp(0.0f);
 310         for (const WorldCollision &c : col) {
 311                 if (!c.Blocks()) continue;
 312                 glm::vec3 local_disp(c.normal * c.depth);
 313                 // swap if neccessary (normal may point away from the entity)
 314                 if (dot(c.normal, e.Position() - c.BlockCoords()) < 0) {
 315                         local_disp *= -1;
 316                 }
 317                 min_disp = min(min_disp, local_disp);
 318                 max_disp = max(max_disp, local_disp);
 319         }
 320         // for each axis
 321         // if only one direction is set, use that as the final
 322         // if both directions are set, use average
 323         glm::vec3 final_disp(0.0f);
 324         for (int axis = 0; axis < 3; ++axis) {
 325                 if (std::abs(min_disp[axis]) > std::numeric_limits<float>::epsilon()) {
 326                         if (std::abs(max_disp[axis]) > std::numeric_limits<float>::epsilon()) {
 327                                 final_disp[axis] = (min_disp[axis] + max_disp[axis]) * 0.5f;
 328                         } else {
 329                                 final_disp[axis] = min_disp[axis];
 330                         }
 331                 } else if (std::abs(max_disp[axis]) > std::numeric_limits<float>::epsilon()) {
 332                         final_disp[axis] = max_disp[axis];
 333                 }
 334         }
 335         e.Move(final_disp);
 336 }
 337
 338
 339 void World::Render(Viewport &viewport) {
 340         viewport.WorldPosition(player->Transform(player->ChunkCoords()));
 341
 342         BlockLighting &chunk_prog = viewport.ChunkProgram();
 343         chunk_prog.SetTexture(block_tex);
 344         chunk_prog.SetFogDensity(fog_density);
 345
 346         for (Chunk &chunk : chunks.Loaded()) {
 347                 glm::mat4 m(chunk.Transform(player->ChunkCoords()));
 348                 chunk_prog.SetM(m);
 349                 glm::mat4 mvp(chunk_prog.GetVP() * m);
 350                 if (!CullTest(Chunk::Bounds(), mvp)) {
 351                         chunk.Draw();
 352                 }
 353         }
 354
 355         DirectionalLighting &entity_prog = viewport.EntityProgram();
 356         entity_prog.SetLightDirection(light_direction);
 357         entity_prog.SetFogDensity(fog_density);
 358
 359         for (Entity &entity : entities) {
 360                 entity.Render(entity.ChunkTransform(player->ChunkCoords()), entity_prog);
 361         }
 362 }
 363
 364 }