src/ai/Spawner.cpp

   1 #include "Spawner.hpp"
   2
   3 #include "Chaser.hpp"
   4 #include "RandomWalk.hpp"
   5 #include "../model/shapes.hpp"
   6 #include "../world/BlockLookup.hpp"
   7 #include "../world/BlockType.hpp"
   8 #include "../world/Entity.hpp"
   9 #include "../world/World.hpp"
  10
  11
  12 namespace blank {
  13
  14 Spawner::Spawner(World &world)
  15 : world(world)
  16 , controllers()
  17 , timer(64)
  18 , despawn_range(128 * 128)
  19 , spawn_distance(16 * 16)
  20 , max_entities(16)
  21 , chunk_range(4) {
  22         EntityModel::Buffer buf;
  23         {
  24                 AABB bounds{{ -0.25f, -0.5f, -0.25f }, { 0.25f, 0.5f, 0.25f }};
  25                 CuboidShape shape(bounds);
  26                 shape.Vertices(buf, 1.0f);
  27                 buf.colors.resize(shape.VertexCount(), { 1.0f, 1.0f, 0.0f });
  28                 models[0].Update(buf);
  29                 skeletons[0].Bounds(bounds);
  30                 skeletons[0].SetNodeModel(&models[0]);
  31         }
  32         {
  33                 AABB bounds{{ -0.5f, -0.25f, -0.5f }, { 0.5f, 0.25f, 0.5f }};
  34                 CuboidShape shape(bounds);
  35                 buf.Clear();
  36                 shape.Vertices(buf, 2.0f);
  37                 buf.colors.resize(shape.VertexCount(), { 0.0f, 1.0f, 1.0f });
  38                 models[1].Update(buf);
  39                 skeletons[1].Bounds(bounds);
  40                 skeletons[1].SetNodeModel(&models[1]);
  41         }
  42         {
  43                 AABB bounds{{ -0.5f, -0.5f, -0.5f }, { 0.5f, 0.5f, 0.5f }};
  44                 StairShape shape(bounds, { 0.4f, 0.4f });
  45                 buf.Clear();
  46                 shape.Vertices(buf, 3.0f);
  47                 buf.colors.resize(shape.VertexCount(), { 1.0f, 0.0f, 1.0f });
  48                 models[2].Update(buf);
  49                 skeletons[2].Bounds(bounds);
  50                 skeletons[2].SetNodeModel(&models[2]);
  51         }
  52
  53         timer.Start();
  54         Spawn(world.Player().ChunkCoords(), { 0.5f, 0.5f, 0.5f });
  55 }
  56
  57 Spawner::~Spawner() {
  58         for (auto &ctrl : controllers) {
  59                 delete ctrl;
  60         }
  61 }
  62
  63
  64 void Spawner::Update(int dt) {
  65         CheckDespawn();
  66         timer.Update(dt);
  67         if (timer.Hit()) {
  68                 TrySpawn();
  69         }
  70         for (auto &ctrl : controllers) {
  71                 ctrl->Update(dt);
  72         }
  73 }
  74
  75
  76 void Spawner::CheckDespawn() noexcept {
  77         const Entity &reference = world.Player();
  78         for (auto iter = controllers.begin(), end = controllers.end(); iter != end;) {
  79                 Entity &e = (*iter)->Controlled();
  80                 if (e.Dead()) {
  81                         delete *iter;
  82                         iter = controllers.erase(iter);
  83                         continue;
  84                 }
  85                 glm::vec3 diff(reference.AbsoluteDifference(e));
  86                 if (dot(diff, diff) > despawn_range) {
  87                         e.Kill();
  88                         delete *iter;
  89                         iter = controllers.erase(iter);
  90                 } else {
  91                         ++iter;
  92                 }
  93         }
  94 }
  95
  96 void Spawner::TrySpawn() {
  97         if (controllers.size() >= max_entities) return;
  98
  99         glm::ivec3 chunk(
 100                 (rand() % (chunk_range * 2 + 1)) - chunk_range,
 101                 (rand() % (chunk_range * 2 + 1)) - chunk_range,
 102                 (rand() % (chunk_range * 2 + 1)) - chunk_range
 103         );
 104
 105         glm::ivec3 pos(
 106                 rand() % Chunk::width,
 107                 rand() % Chunk::height,
 108                 rand() % Chunk::depth
 109         );
 110
 111
 112         // distance check
 113         glm::vec3 diff(glm::vec3(chunk * Chunk::Extent() - pos) + world.Player().Position());
 114         float dist = dot(diff, diff);
 115         if (dist > despawn_range || dist < spawn_distance) {
 116                 return;
 117         }
 118
 119         // check if the spawn block and the one above it are loaded and inhabitable
 120         BlockLookup spawn_block(&world.PlayerChunk(), chunk * Chunk::Extent() + pos);
 121         if (!spawn_block || spawn_block.GetType().collide_block) {
 122                 return;
 123         }
 124
 125         BlockLookup head_block(spawn_block.Next(Block::FACE_UP));
 126         if (!head_block || head_block.GetType().collide_block) {
 127                 return;
 128         }
 129
 130         Spawn(world.Player().ChunkCoords() + chunk, glm::vec3(pos) + glm::vec3(0.5f));
 131 }
 132
 133 void Spawner::Spawn(const glm::ivec3 &chunk, const glm::vec3 &pos) {
 134         glm::vec3 rot(0.000001f);
 135         rot.x *= (rand() % 1024);
 136         rot.y *= (rand() % 1024);
 137         rot.z *= (rand() % 1024);
 138
 139         Entity &e = world.AddEntity();
 140         e.Name("spawned");
 141         e.Position(chunk, pos);
 142         e.Bounds({ { -0.5f, -0.5f, -0.5f }, { 0.5f, 0.5f, 0.5f } });
 143         e.WorldCollidable(true);
 144         skeletons[rand() % 3].Instantiate(e.GetModel());
 145         e.AngularVelocity(rot);
 146         Controller *ctrl;
 147         if (rand() % 2) {
 148                 ctrl = new RandomWalk(e);
 149         } else {
 150                 ctrl = new Chaser(world, e, world.Player());
 151         }
 152         controllers.emplace_back(ctrl);
 153 }
 154
 155 }