enemy_system.cpp 11.5 KB
Newer Older
1
2
#include "enemy_system.hpp"

3
#include "beat_system.hpp"
4
5
#include "combat_system.hpp"

6
#include "movement_comp.hpp"
7
#include "player_comp.hpp"
Tim Scheiber's avatar
Tim Scheiber committed
8
#include "rigid_body_comp.hpp"
9

10
#include <mirrage/ecs/components/transform_comp.hpp>
11
12

namespace phase_shifter::gameplay {
Tim Scheiber's avatar
Tim Scheiber committed
13

14
15
	using namespace mirrage::ecs;

16
17
18
19
	Enemy_system::Enemy_system(mirrage::util::Message_bus& bus,
	                           Entity_manager&             entity_manager,
	                           const Beat_system&          beat_system)
	  : _bus(bus), _entity_manager(entity_manager), _beat_system(beat_system)
20
21
	{
		_entity_manager.register_component_type<Fixed_path_comp>();
22
		_entity_manager.register_component_type<Follow_target_comp>();
23
		_entity_manager.register_component_type<Continuous_path_comp>();
24
		_entity_manager.register_component_type<Shooting_comp>();
25
		_entity_manager.register_component_type<Target_comp>();
26
		_entity_manager.register_component_type<Bullet_comp>();
27
28
29
30
	}

	void Enemy_system::update(mirrage::util::Time dt)
	{
31
32
		auto beat = _beat_system.beat_state();

Tim Scheiber's avatar
Tim Scheiber committed
33
		despawn_distant_bullets();
34
35
36
37
38
		do_movement(beat);
		do_shooting(beat);
		do_bullet_hit_detection();
	}

Tim Scheiber's avatar
Tim Scheiber committed
39
40
	void Enemy_system::do_movement(Beat_state& beat)
	{
41
42
43
44
45
		do_fixed_path_movement(beat);
		do_cont_path_movement(beat);
		do_hunting_movement(beat);
	}

Tim Scheiber's avatar
Tim Scheiber committed
46
47
	void Enemy_system::do_fixed_path_movement(Beat_state& beat)
	{
48
		for(auto&& [movement, fixed_path] : _entity_manager.list<Movement_comp, Fixed_path_comp>()) {
49
50
51
52
53
			if(beat.beat) {
				if(fixed_path.wait_beats == 0 && !movement.move) {
					float direction = fixed_path.next_direction();
					if(direction < 360) {
						float rad_direction = direction * mirrage::util::PI / 180.f;
54
55
56
						movement.aim.x      = std::sin(rad_direction);
						movement.aim.y      = -std::cos(rad_direction);
						movement.move       = true;
57
58
59
60
					}
					fixed_path.wait_beats = fixed_path.pause_between_steps;
				} else {
					fixed_path.wait_beats--;
61
62
63
				}
			}
		}
64
65
	}

Tim Scheiber's avatar
Tim Scheiber committed
66
67
	void Enemy_system::do_cont_path_movement(Beat_state& beat)
	{
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
		for(auto&& [movement, cont_path] : _entity_manager.list<Movement_comp, Continuous_path_comp>()) {
			if(beat.beat) {
				if(cont_path.wait_beats == 0 && !movement.move) {
					float rad_direction  = cont_path.next_direction() * mirrage::util::PI / 180.f;
					movement.aim.x       = std::sin(rad_direction);
					movement.aim.y       = -std::cos(rad_direction);
					movement.move        = true;
					cont_path.wait_beats = cont_path.pause_between_steps;
				} else {
					cont_path.wait_beats--;
				}
			}
		}
	}

Tim Scheiber's avatar
Tim Scheiber committed
83
84
	void Enemy_system::do_hunting_movement(Beat_state& beat)
	{
85
86
		for(auto&& [movement, follow_target, transform] :
		    _entity_manager.list<Movement_comp, Follow_target_comp, components::Transform_comp>()) {
87
88
89
			if(beat.beat) {
				if(follow_target.wait_beats == 0 && !movement.move) {
					auto target_facet = _entity_manager.get(follow_target.target);
90

91
					if(target_facet.is_some()) {
92
						auto target_transform = target_facet.get_or_throw().get<components::Transform_comp>();
93

94
95
96
97
98
99
100
101
102
103
104
						if(target_transform.is_some()) {
							auto& target_position = target_transform.get_or_throw().position;
							auto& my_position     = transform.position;
							movement.aim          = glm::vec2(
                                    {target_position.x - my_position.x, target_position.z - my_position.z});
							movement.move = true;
						}
					}
					follow_target.wait_beats = follow_target.pause_between_steps;
				} else {
					follow_target.wait_beats--;
105
106
107
				}
			}
		}
108
	}
109

Tim Scheiber's avatar
Tim Scheiber committed
110
111
	void Enemy_system::do_shooting(Beat_state& beat)
	{
Tim Scheiber's avatar
Tim Scheiber committed
112
113
		for(auto&& [entity, shooting, transform] :
		    _entity_manager.list<Entity_facet, Shooting_comp, components::Transform_comp>()) {
Tim Scheiber's avatar
Tim Scheiber committed
114
115
116
117
118
119
120
			auto my_position = transform.position;
			for(auto&& [player, player_transform] :
			    _entity_manager.list<Player_comp, components::Transform_comp>()) {
				if(glm::length(glm::vec2{player_transform.position.x, player_transform.position.z}
				               - glm::vec2{my_position.x, my_position.z}) <= trigger_distance_shooting) {
					glm::vec3 closest_target_pos(0.f);
					float     closest_dist = 999999999.f;
Tim Scheiber's avatar
Tim Scheiber committed
121

Tim Scheiber's avatar
Tim Scheiber committed
122
123
					for(auto&& [target, target_comp, target_transform] :
					    _entity_manager.list<Entity_facet, Target_comp, components::Transform_comp>()) {
124

Tim Scheiber's avatar
Tim Scheiber committed
125
126
127
128
129
130
131
132
						auto target_position = target_transform.position;
						auto dist            = glm::length(glm::vec2(target_position.x, target_position.z)
                                                - glm::vec2(my_position.x, my_position.z));
						if(dist < closest_dist) {
							closest_dist       = dist;
							closest_target_pos = target_position;
						}
					}
133

Tim Scheiber's avatar
Tim Scheiber committed
134
135
136
137
138
139
140
					glm::vec2 t_direction{closest_target_pos.x - my_position.x,
					                      closest_target_pos.z - my_position.z};
					shooting.target_direction =
					        std::acos(-t_direction.y / glm::length(t_direction)) * 180.f / mirrage::util::PI;
					if(t_direction.x < 0) {
						shooting.target_direction *= -1;
					}
141

Tim Scheiber's avatar
Tim Scheiber committed
142
143
144
145
					if(closest_dist <= shooting.attack_radius) {
						shooting.idle = false;
					} else {
						shooting.idle = true;
146
147
					}

Tim Scheiber's avatar
Tim Scheiber committed
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
					auto orientation = shooting.target_direction;
					if(shooting.idle) {
						orientation = shooting.default_orientation + shooting.rotation;
					}
					auto rad_orientation = orientation * mirrage::util::PI / 180.f;

					if(beat.beat) {
						if(shooting.idle && shooting.rotate) {
							shooting.do_rotation();
							shooting.rotate = false;
						}
						if(shooting.wait_beats == 0) {
							auto bullet_pattern = shooting.next_pattern();
							auto spawn_position = transform.position
							                      + shooting.spawn_offset
							                                * glm::vec3(std::sin(rad_orientation),
							                                            0,
							                                            -std::cos(rad_orientation));

							for(auto bullet : bullet_pattern.bullets) {
								auto bullet_direction     = orientation + bullet.direction;
								auto rad_bullet_direction = bullet_direction * mirrage::util::PI / 180.f;
								_entity_manager.entity_builder("bullet")
								        .position(spawn_position)
								        .rotation(glm::rotation({0, 0, 1},
								                                glm::vec3(std::sin(rad_bullet_direction),
								                                          0,
								                                          -std::cos(rad_bullet_direction))))
								        .post_create([=](auto entity) {
									        entity.process([=](Continuous_path_comp& cont_path) {
										        cont_path.direction = bullet_direction;
										        cont_path.curvature = bullet.curvature;
									        });
									        entity.process([=](Movement_comp&        move,
									                           Continuous_path_comp& cont_path) {
										        float rad_direction =
										                cont_path.direction * mirrage::util::PI / 180.f;
										        move.aim.x = std::sin(rad_direction);
										        move.aim.y = -std::cos(rad_direction);
									        });
								        })
								        .create();
							}

							shooting.wait_beats = shooting.pause_between_shots;
							if(shooting.rotation_per_step < 0.0001f) {
								shooting.rotate = true;
							}
						} else {
							shooting.wait_beats--;
						}
					}

					transform.orientation = glm::rotation(
					        {0, 0, 1}, glm::vec3(std::sin(rad_orientation), 0, -std::cos(rad_orientation)));
					entity.process([&](Movement_comp& movement) { movement.want_orientation = false; });
204
205
206
				}
			}
		}
207
	}
208
209
210

	void Enemy_system::do_bullet_hit_detection()
	{
Tim Scheiber's avatar
Tim Scheiber committed
211
212
213
214
215
216
217
218
219
220
221
222
		for(auto&& [bullet_handle, bullet, bullet_transform, bullet_body, bullet_movement] :
		    _entity_manager.list<Entity_handle,
		                         Bullet_comp,
		                         components::Transform_comp,
		                         Rigid_body_comp,
		                         Movement_comp>()) {
			for(auto&& [player_handle, player, player_transform, player_body, player_movement] :
			    _entity_manager.list<Entity_handle,
			                         Player_comp,
			                         components::Transform_comp,
			                         Rigid_body_comp,
			                         Movement_comp>()) {
223
				glm::vec2 bullet_pos{bullet_transform.position.x, bullet_transform.position.z};
Tim Scheiber's avatar
Tim Scheiber committed
224
				glm::vec2 last_bullet_pos = bullet_movement.last_position;
225
				glm::vec2 player_pos{player_transform.position.x, player_transform.position.z};
Tim Scheiber's avatar
Tim Scheiber committed
226
				glm::vec2 last_player_pos = player_movement.last_position;
227
				if(!bullet_movement.moved) {
Tim Scheiber's avatar
Tim Scheiber committed
228
229
					last_bullet_pos = bullet_pos;
				}
230
				if(!player_movement.moved) {
Tim Scheiber's avatar
Tim Scheiber committed
231
232
					last_player_pos = player_pos;
				}
233
234
				if(intersect(Stadium{last_bullet_pos, bullet_pos, bullet_body.radius},
				             Stadium{last_player_pos, player_pos, player_body.radius})) {
235
236
237
238
239
240
					_entity_manager.erase(bullet_handle);
					_bus.send<Damaged_msg>(player_handle);
				}
			}
		}
	}
Tim Scheiber's avatar
Tim Scheiber committed
241

Tim Scheiber's avatar
Tim Scheiber committed
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
	void Enemy_system::despawn_distant_bullets()
	{
		for(auto&& [bullet_handle, bullet, bullet_transform] :
		    _entity_manager.list<Entity_handle, Bullet_comp, components::Transform_comp>()) {
			bool despawn_bullet = true;
			for (auto&& [player, player_transform] :
				_entity_manager.list<Player_comp, components::Transform_comp>()) {
				if(glm::length(glm::vec2{bullet_transform.position.x, bullet_transform.position.z}
				               - glm::vec2{player_transform.position.x, player_transform.position.z})
				   < trigger_distance_despawn_bullets) {
					despawn_bullet = false;
				}
			}
			if (despawn_bullet) {
				_entity_manager.erase(bullet_handle);
			}
		}
	}

261
	bool Enemy_system::intersect(const Stadium& stad1, const Stadium& stad2)
Tim Scheiber's avatar
Tim Scheiber committed
262
263
264
265
	{
		glm::vec2 direction1 = stad1.point2 - stad1.point1;
		glm::vec2 direction2 = stad2.point2 - stad2.point1;

266
267
268
269
270
271
272
273
274
275
		// check for intersection of the line segments
		float temp = -direction2.x * direction1.y + direction1.x * direction2.y;
		if (temp != 0) {
			float s = (-direction1.y * (stad1.point1.x - stad2.point1.x)
			     + direction1.x * (stad1.point1.y - stad2.point1.y))
			    / temp;
			float t = (-direction2.y * (stad1.point1.x - stad2.point1.x)
			     + direction2.x * (stad1.point1.y - stad2.point1.y))
			    / temp;
			if (s >= 0 && s <= 1 && t >= 0 && t <= 1) {
Tim Scheiber's avatar
Tim Scheiber committed
276
277
278
279
				return true;
			}
		}

280
		// check the distance from each end point to the other line segment
Tim Scheiber's avatar
Tim Scheiber committed
281
282
283
		float comb_radius = stad1.radius + stad2.radius;

		float length2 = glm::length2(direction1);
284
285
286
		if(length2 <= 0.001f) {
			if(glm::distance(stad2.point1, stad1.point1) < comb_radius
			   || glm::distance(stad2.point2, stad1.point1) < comb_radius) {
Tim Scheiber's avatar
Tim Scheiber committed
287
288
289
290
291
292
293
294
295
296
297
298
299
300
				return true;
			}
		}
		float lambda = std::clamp(dot(stad2.point1 - stad1.point1, direction1), 0.f, 1.f);
		if(glm::distance(stad2.point1, stad1.point1 + lambda * direction1) < comb_radius) {
			return true;
		}
		lambda = std::clamp(dot(stad2.point2 - stad1.point1, direction1), 0.f, 1.f);
		if(glm::distance(stad2.point2, stad1.point1 + lambda * direction1) < comb_radius) {
			return true;
		}

		length2 = glm::length2(direction2);
		if(length2 <= 0.001f) {
301
302
			if(glm::distance(stad1.point1, stad2.point1) < comb_radius
			   || glm::distance(stad1.point2, stad2.point1) < comb_radius) {
Tim Scheiber's avatar
Tim Scheiber committed
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
				return true;
			}
		}
		lambda = std::clamp(dot(stad1.point1 - stad2.point1, direction2), 0.f, 1.f);
		if(glm::distance(stad1.point1, stad2.point1 + lambda * direction2) < comb_radius) {
			return true;
		}
		lambda = std::clamp(dot(stad1.point2 - stad2.point1, direction2), 0.f, 1.f);
		if(glm::distance(stad1.point2, stad2.point1 + lambda * direction2) < comb_radius) {
			return true;
		}

		return false;
	}

318
319
	float Enemy_system::dot(const glm::vec2& a, const glm::vec2& b) { return a.x * b.x + a.y * b.y; }
} // namespace phase_shifter::gameplay