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, std::uint64_t seed)
  15 : world(world)
  16 , controllers()
  17 , random(seed)
  18 , timer(64)
  19 , despawn_range(128 * 128)
  20 , spawn_distance(16 * 16)
  21 , max_entities(16)
  22 , chunk_range(4) {
  23         EntityModel::Buffer buf;
  24         {
  25                 AABB bounds{{ -0.25f, -0.5f, -0.25f }, { 0.25f, 0.5f, 0.25f }};
  26                 CuboidShape shape(bounds);
  27                 shape.Vertices(buf, 1.0f);
  28                 buf.colors.resize(shape.VertexCount(), { 1.0f, 1.0f, 0.0f });
  29                 models[0].Update(buf);
  30                 skeletons[0].Bounds(bounds);
  31                 skeletons[0].SetNodeModel(&models[0]);
  32         }
  33         {
  34                 AABB bounds{{ -0.5f, -0.25f, -0.5f }, { 0.5f, 0.25f, 0.5f }};
  35                 CuboidShape shape(bounds);
  36                 buf.Clear();
  37                 shape.Vertices(buf, 2.0f);
  38                 buf.colors.resize(shape.VertexCount(), { 0.0f, 1.0f, 1.0f });
  39                 models[1].Update(buf);
  40                 skeletons[1].Bounds(bounds);
  41                 skeletons[1].SetNodeModel(&models[1]);
  42         }
  43         {
  44                 AABB bounds{{ -0.5f, -0.5f, -0.5f }, { 0.5f, 0.5f, 0.5f }};
  45                 StairShape shape(bounds, { 0.4f, 0.4f });
  46                 buf.Clear();
  47                 shape.Vertices(buf, 3.0f);
  48                 buf.colors.resize(shape.VertexCount(), { 1.0f, 0.0f, 1.0f });
  49                 models[2].Update(buf);
  50                 skeletons[2].Bounds(bounds);
  51                 skeletons[2].SetNodeModel(&models[2]);
  52         }
  53
  54         timer.Start();
  55         Spawn(world.Player().ChunkCoords(), { 0.5f, 0.5f, 0.5f });
  56 }
  57
  58 Spawner::~Spawner() {
  59         for (auto &ctrl : controllers) {
  60                 delete ctrl;
  61         }
  62 }
  63
  64
  65 void Spawner::Update(int dt) {
  66         CheckDespawn();
  67         timer.Update(dt);
  68         if (timer.Hit()) {
  69                 TrySpawn();
  70         }
  71         for (auto &ctrl : controllers) {
  72                 ctrl->Update(dt);
  73         }
  74 }
  75
  76
  77 void Spawner::CheckDespawn() noexcept {
  78         const Entity &reference = world.Player();
  79         for (auto iter = controllers.begin(), end = controllers.end(); iter != end;) {
  80                 Entity &e = (*iter)->Controlled();
  81                 if (e.Dead()) {
  82                         delete *iter;
  83                         iter = controllers.erase(iter);
  84                         continue;
  85                 }
  86                 glm::vec3 diff(reference.AbsoluteDifference(e));
  87                 if (dot(diff, diff) > despawn_range) {
  88                         e.Kill();
  89                         delete *iter;
  90                         iter = controllers.erase(iter);
  91                 } else {
  92                         ++iter;
  93                 }
  94         }
  95 }
  96
  97 void Spawner::TrySpawn() {
  98         if (controllers.size() >= max_entities) return;
  99
 100         glm::ivec3 chunk(
 101                 (random.Next<unsigned char>() % (chunk_range * 2 + 1)) - chunk_range,
 102                 (random.Next<unsigned char>() % (chunk_range * 2 + 1)) - chunk_range,
 103                 (random.Next<unsigned char>() % (chunk_range * 2 + 1)) - chunk_range
 104         );
 105
 106         glm::ivec3 pos(
 107                 random.Next<unsigned char>() % Chunk::width,
 108                 random.Next<unsigned char>() % Chunk::height,
 109                 random.Next<unsigned char>() % Chunk::depth
 110         );
 111
 112
 113         // distance check
 114         glm::vec3 diff(glm::vec3(chunk * Chunk::Extent() - pos) + world.Player().Position());
 115         float dist = dot(diff, diff);
 116         if (dist > despawn_range || dist < spawn_distance) {
 117                 return;
 118         }
 119
 120         // check if the spawn block and the one above it are loaded and inhabitable
 121         BlockLookup spawn_block(&world.PlayerChunk(), chunk * Chunk::Extent() + pos);
 122         if (!spawn_block || spawn_block.GetType().collide_block) {
 123                 return;
 124         }
 125
 126         BlockLookup head_block(spawn_block.Next(Block::FACE_UP));
 127         if (!head_block || head_block.GetType().collide_block) {
 128                 return;
 129         }
 130
 131         Spawn(world.Player().ChunkCoords() + chunk, glm::vec3(pos) + glm::vec3(0.5f));
 132 }
 133
 134 void Spawner::Spawn(const glm::ivec3 &chunk, const glm::vec3 &pos) {
 135         glm::vec3 rot(0.000001f);
 136         rot.x *= (random.Next<unsigned short>() % 1024);
 137         rot.y *= (random.Next<unsigned short>() % 1024);
 138         rot.z *= (random.Next<unsigned short>() % 1024);
 139
 140         Entity &e = world.AddEntity();
 141         e.Name("spawned");
 142         e.Position(chunk, pos);
 143         e.Bounds({ { -0.5f, -0.5f, -0.5f }, { 0.5f, 0.5f, 0.5f } });
 144         e.WorldCollidable(true);
 145         skeletons[random.Next<unsigned char>() % 3].Instantiate(e.GetModel());
 146         e.AngularVelocity(rot);
 147         Controller *ctrl;
 148         if (random()) {
 149                 ctrl = new RandomWalk(e, random.Next<std::uint64_t>());
 150         } else {
 151                 ctrl = new Chaser(world, e, world.Player());
 152         }
 153         controllers.emplace_back(ctrl);
 154 }
 155
 156 }