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
   9 #include <glm/glm.hpp>
  10
  11
  12 namespace blank {
  13
  14 Chaser::Chaser(World &world, Entity &ctrl, Entity &tgt) noexcept
  15 : Controller(ctrl)
  16 , world(world)
  17 , tgt(tgt)
  18 , chase_speed(0.002f)
  19 , flee_speed(-0.005f)
  20 , stop_dist(10)
  21 , flee_dist(5) {
  22
  23 }
  24
  25 Chaser::~Chaser() {
  26
  27 }
  28
  29 void Chaser::Update(int dt) {
  30         glm::vec3 diff(Target().AbsoluteDifference(Controlled()));
  31         float dist = length(diff);
  32         glm::vec3 norm_diff(diff / dist);
  33
  34         bool line_of_sight = true;
  35         // FIXME: this only works if target is in the reference chunk (which is true for the player)
  36         Ray aim{Target().Position() - diff, norm_diff};
  37         Chunk *chunk;
  38         int blkid;
  39         float distance;
  40         glm::vec3 normal;
  41         if (world.Intersection(aim, glm::mat4(1.0f), chunk, blkid, distance, normal)) {
  42                 line_of_sight = distance > dist;
  43         }
  44
  45         if (!line_of_sight) {
  46                 Controlled().Velocity(glm::vec3(0.0f));
  47         } else if (dist > stop_dist) {
  48                 Controlled().Velocity(norm_diff * chase_speed);
  49         } else if (dist < flee_dist) {
  50                 Controlled().Velocity(norm_diff * flee_speed);
  51         } else {
  52                 Controlled().Velocity(glm::vec3(0.0f));
  53         }
  54 }
  55
  56
  57 Controller::Controller(Entity &e) noexcept
  58 : entity(e) {
  59
  60 }
  61
  62 Controller::~Controller() {
  63
  64 }
  65
  66
  67 RandomWalk::RandomWalk(Entity &e) noexcept
  68 : Controller(e)
  69 , time_left(0) {
  70
  71 }
  72
  73 RandomWalk::~RandomWalk() {
  74
  75 }
  76
  77 void RandomWalk::Update(int dt) {
  78         time_left -= dt;
  79         if (time_left > 0) return;
  80         time_left += 2500 + (rand() % 5000);
  81
  82         constexpr float move_vel = 0.0005f;
  83
  84         glm::vec3 new_vel = Controlled().Velocity();
  85
  86         switch (rand() % 9) {
  87                 case 0:
  88                         new_vel.x = -move_vel;
  89                         break;
  90                 case 1:
  91                         new_vel.x = 0.0f;
  92                         break;
  93                 case 2:
  94                         new_vel.x = move_vel;
  95                         break;
  96                 case 3:
  97                         new_vel.y = -move_vel;
  98                         break;
  99                 case 4:
 100                         new_vel.y = 0.0f;
 101                         break;
 102                 case 5:
 103                         new_vel.y = move_vel;
 104                         break;
 105                 case 6:
 106                         new_vel.z = -move_vel;
 107                         break;
 108                 case 7:
 109                         new_vel.z = 0.0f;
 110                         break;
 111                 case 8:
 112                         new_vel.z = move_vel;
 113                         break;
 114         }
 115
 116         Controlled().Velocity(new_vel);
 117 }
 118
 119 }