src/ai/ai.cpp

   1 #include "Chaser.hpp"
   2 #include "Controller.hpp"
   3 #include "RandomWalk.hpp"
   4
   5 #include "../model/geometry.hpp"
   6 #include "../world/Entity.hpp"
   7 #include "../world/World.hpp"
   8 #include "../world/WorldCollision.hpp"
   9
  10 #include <glm/glm.hpp>
  11
  12
  13 namespace blank {
  14
  15 Chaser::Chaser(World &world, Entity &ctrl, Entity &tgt) noexcept
  16 : Controller(ctrl)
  17 , world(world)
  18 , tgt(tgt)
  19 , chase_speed(0.002f)
  20 , flee_speed(-0.005f)
  21 , stop_dist(10)
  22 , flee_dist(5) {
  23         tgt.Ref();
  24 }
  25
  26 Chaser::~Chaser() {
  27         tgt.UnRef();
  28 }
  29
  30 void Chaser::Update(int dt) {
  31         glm::vec3 diff(Target().AbsoluteDifference(Controlled()));
  32         float dist = length(diff);
  33         glm::vec3 norm_diff(diff / dist);
  34
  35         bool line_of_sight = true;
  36         Ray aim{Target().Position() - diff, norm_diff};
  37         WorldCollision coll;
  38         if (world.Intersection(aim, glm::mat4(1.0f), Target().ChunkCoords(), coll)) {
  39                 line_of_sight = coll.depth > dist;
  40         }
  41
  42         if (!line_of_sight) {
  43                 Controlled().Velocity(glm::vec3(0.0f));
  44         } else if (dist > stop_dist) {
  45                 Controlled().Velocity(norm_diff * chase_speed);
  46         } else if (dist < flee_dist) {
  47                 Controlled().Velocity(norm_diff * flee_speed);
  48         } else {
  49                 Controlled().Velocity(glm::vec3(0.0f));
  50         }
  51 }
  52
  53
  54 Controller::Controller(Entity &e) noexcept
  55 : entity(e) {
  56         entity.Ref();
  57 }
  58
  59 Controller::~Controller() {
  60         entity.UnRef();
  61 }
  62
  63
  64 RandomWalk::RandomWalk(Entity &e, std::uint64_t seed) noexcept
  65 : Controller(e)
  66 , random(seed)
  67 , time_left(0) {
  68
  69 }
  70
  71 RandomWalk::~RandomWalk() {
  72
  73 }
  74
  75 void RandomWalk::Update(int dt) {
  76         time_left -= dt;
  77         if (time_left > 0) return;
  78         time_left += 2500 + (random.Next<unsigned short>() % 5000);
  79
  80         constexpr float move_vel = 0.0005f;
  81
  82         glm::vec3 new_vel = Controlled().Velocity();
  83
  84         switch (random.Next<unsigned char>() % 9) {
  85                 case 0:
  86                         new_vel.x = -move_vel;
  87                         break;
  88                 case 1:
  89                         new_vel.x = 0.0f;
  90                         break;
  91                 case 2:
  92                         new_vel.x = move_vel;
  93                         break;
  94                 case 3:
  95                         new_vel.y = -move_vel;
  96                         break;
  97                 case 4:
  98                         new_vel.y = 0.0f;
  99                         break;
 100                 case 5:
 101                         new_vel.y = move_vel;
 102                         break;
 103                 case 6:
 104                         new_vel.z = -move_vel;
 105                         break;
 106                 case 7:
 107                         new_vel.z = 0.0f;
 108                         break;
 109                 case 8:
 110                         new_vel.z = move_vel;
 111                         break;
 112         }
 113
 114         Controlled().Velocity(new_vel);
 115 }
 116
 117 }