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