2 #include "EntityController.hpp"
3 #include "EntityDerivative.hpp"
4 #include "EntityState.hpp"
8 #include "ChunkIndex.hpp"
9 #include "EntityCollision.hpp"
10 #include "WorldCollision.hpp"
11 #include "../app/Assets.hpp"
12 #include "../geometry/const.hpp"
13 #include "../geometry/distance.hpp"
14 #include "../graphics/Format.hpp"
15 #include "../graphics/Viewport.hpp"
21 #include <glm/gtx/euler_angles.hpp>
22 #include <glm/gtx/io.hpp>
23 #include <glm/gtx/quaternion.hpp>
24 #include <glm/gtx/rotate_vector.hpp>
25 #include <glm/gtx/transform.hpp>
30 Entity::Entity() noexcept
38 , heading(0.0f, 0.0f, -1.0f)
42 , world_collision(false)
44 , owns_controller(false) {
48 Entity::~Entity() noexcept {
52 Entity::Entity(const Entity &other) noexcept
57 , bounds(other.bounds)
59 , model_transform(1.0f)
60 , view_transform(1.0f)
62 , heading(0.0f, 0.0f, -1.0f)
63 , max_vel(other.max_vel)
64 , max_force(other.max_force)
66 , world_collision(other.world_collision)
68 , owns_controller(false) {
72 void Entity::SetController(EntityController *c) noexcept {
75 owns_controller = true;
78 void Entity::SetController(EntityController &c) noexcept {
81 owns_controller = false;
84 void Entity::UnsetController() noexcept {
85 if (ctrl && owns_controller) {
91 glm::vec3 Entity::ControlForce(const EntityState &s) const noexcept {
92 if (HasController()) {
93 return GetController().ControlForce(*this, s);
99 void Entity::Position(const glm::ivec3 &c, const glm::vec3 &b) noexcept {
104 void Entity::Position(const glm::vec3 &pos) noexcept {
105 state.pos.block = pos;
106 state.AdjustPosition();
109 void Entity::TurnHead(float dp, float dy) noexcept {
110 SetHead(state.pitch + dp, state.yaw + dy);
113 void Entity::SetHead(float p, float y) noexcept {
118 glm::mat4 Entity::Transform(const glm::ivec3 &reference) const noexcept {
119 return glm::translate(glm::vec3((state.pos.chunk - reference) * ExactLocation::Extent())) * model_transform;
122 glm::mat4 Entity::ViewTransform(const glm::ivec3 &reference) const noexcept {
123 return Transform(reference) * view_transform;
126 Ray Entity::Aim(const ExactLocation::Coarse &chunk_offset) const noexcept {
127 glm::mat4 transform = ViewTransform(chunk_offset);
128 return Ray{ glm::vec3(transform[3]), -glm::vec3(transform[2]) };
131 void Entity::Update(float dt) {
134 if (HasController()) {
135 GetController().Update(*this, dt);
140 void Entity::UpdateTransforms() noexcept {
141 // model transform is the one given by current state
142 model_transform = state.Transform(state.pos.chunk);
143 // view transform is either the model's eyes transform or,
144 // should the entity have no model, the pitch (yaw already is
145 // in model transform)
147 view_transform = model.EyesTransform();
149 view_transform = toMat4(glm::quat(glm::vec3(state.pitch, state.yaw, 0.0f)));
153 void Entity::UpdateHeading() noexcept {
154 speed = length(Velocity());
155 if (speed > std::numeric_limits<float>::epsilon()) {
156 heading = Velocity() / speed;
159 // use -Z (forward axis) of model transform (our "chest")
160 heading = -glm::vec3(model_transform[2]);
164 void Entity::UpdateModel(float dt) noexcept {
165 // first, sanitize the pitch and yaw fields of state (our input)
166 // those indicate the head orientation in the entity's local cosystem
167 state.AdjustHeading();
168 // TODO: this flickers horrible and also shouldn't be based on velocity, but on control force
173 void Entity::OrientBody(float dt) noexcept {
174 // maximum body rotation per second (due to velocity orientation) (90°)
175 constexpr float max_body_turn_per_second = PI_0p5;
176 const float max_body_turn = max_body_turn_per_second * dt;
177 // minimum speed to apply body correction
178 constexpr float min_speed = 0.0625f;
180 const glm::vec3 up(model_transform[1]);
181 if (speed > min_speed) {
182 // check if our orientation and velocity are aligned
183 const glm::vec3 forward(-model_transform[2]);
184 // facing is local -Z rotated about local Y by yaw and transformed into world space
185 const glm::vec3 facing(normalize(glm::vec3(glm::vec4(rotateY(glm::vec3(0.0f, 0.0f, -1.0f), state.yaw), 0.0f) * transpose(model_transform))));
186 // only adjust if velocity isn't almost parallel to up
187 float vel_dot_up = dot(Velocity(), up);
188 if (std::abs(1.0f - std::abs(vel_dot_up)) > std::numeric_limits<float>::epsilon()) {
189 // get direction of velocity projected onto model plane
190 glm::vec3 direction(normalize(Velocity() - (Velocity() * vel_dot_up)));
191 // if velocity points away from our facing (with a little bias), flip it around
192 // (the entity is "walking backwards")
193 if (dot(facing, direction) < -0.1f) {
194 direction = -direction;
196 // calculate the difference between forward and direction
197 const float absolute_difference = std::acos(dot(forward, direction));
198 // if direction is clockwise with respect to up vector, invert the angle
199 const float relative_difference = dot(cross(forward, direction), up) < 0.0f
200 ? -absolute_difference
201 : absolute_difference;
202 // only correct by half the difference max
203 const float correction = glm::clamp(relative_difference * 0.5f, -max_body_turn, max_body_turn);
205 std::cout << "orientation before: " << state.orient << std::endl;
206 std::cout << "up: " << up << std::endl;
207 std::cout << "forward: " << forward << std::endl;
208 std::cout << "facing: " << facing << std::endl;
209 std::cout << "direction: " << direction << std::endl;
210 std::cout << "difference: " << glm::degrees(relative_difference) << "°" << std::endl;
211 std::cout << "correction: " << glm::degrees(correction) << "°" << std::endl;
212 std::cout << std::endl;
214 // now rotate body by correction and head by -correction
215 state.orient = rotate(state.orient, correction, up);
216 state.yaw -= correction;
221 void Entity::OrientHead(float dt) noexcept {
222 // maximum yaw of head (90°)
223 constexpr float max_head_yaw = PI_0p5;
225 const glm::vec3 up(model_transform[1]);
226 // if yaw is bigger than max, rotate the body to accomodate
227 if (std::abs(state.yaw) > max_head_yaw) {
228 float deviation = state.yaw < 0.0f ? state.yaw + max_head_yaw : state.yaw - max_head_yaw;
229 // rotate the entity by deviation about local Y
230 state.orient = rotate(state.orient, deviation, up);
231 // and remove from head yaw
232 state.yaw -= deviation;
233 // shouldn't be necessary if max_head_yaw is < PI, but just to be sure :p
234 state.AdjustHeading();
236 // update model if any
238 model.EyesState().orientation = glm::quat(glm::vec3(state.pitch, state.yaw, 0.0f));
243 EntityController::~EntityController() {
247 bool EntityController::MaxOutForce(
249 const glm::vec3 &add,
252 if (iszero(add) || any(isnan(add))) {
255 float current = iszero(out) ? 0.0f : length(out);
256 float remain = max - current;
257 if (remain <= 0.0f) {
260 float additional = length(add);
261 if (additional > remain) {
262 out += normalize(add) * remain;
271 EntityState::EntityState()
274 , orient(1.0f, 0.0f, 0.0f, 0.0f)
280 void EntityState::AdjustPosition() noexcept {
284 void EntityState::AdjustHeading() noexcept {
285 pitch = glm::clamp(pitch, -PI_0p5, PI_0p5);
294 glm::mat4 EntityState::Transform(const glm::ivec3 &reference) const noexcept {
295 const glm::vec3 translation = RelativePosition(reference);
296 glm::mat4 transform(toMat4(orient));
297 transform[3] = glm::vec4(translation, 1.0f);
302 Player::Player(Entity &e, ChunkIndex &c)
313 bool Player::SuitableSpawn(BlockLookup &spawn_block) const noexcept {
314 if (!spawn_block || spawn_block.GetType().collide_block) {
318 BlockLookup head_block(spawn_block.Next(Block::FACE_UP));
319 if (!head_block || head_block.GetType().collide_block) {
326 void Player::Update(int dt) {
327 chunks.Rebase(entity.ChunkCoords());
331 World::World(const BlockTypeRegistry &types, const Config &config)
337 , light_direction(config.light_direction)
338 , fog_density(config.fog_density) {
343 for (Entity &e : entities) {
346 std::size_t removed = 0;
349 for (auto e = entities.begin(), end = entities.end(); e != end; ++e) {
350 if (e->CanRemove()) {
352 end = entities.end();
356 } while (removed > 0 && !entities.empty());
360 Player *World::AddPlayer(const std::string &name) {
361 for (Player &p : players) {
362 if (p.Name() == name) {
366 Entity &entity = AddEntity();
368 entity.Bounds({ { -0.4f, -0.9f, -0.4f }, { 0.4f, 0.9f, 0.4f } });
369 entity.WorldCollidable(true);
370 ChunkIndex &index = chunks.MakeIndex(entity.ChunkCoords(), 6);
371 players.emplace_back(entity, index);
372 return &players.back();
375 Player *World::AddPlayer(const std::string &name, std::uint32_t id) {
376 for (Player &p : players) {
377 if (p.Name() == name) {
381 Entity *entity = AddEntity(id);
386 entity->Bounds({ { -0.4f, -0.9f, -0.4f }, { 0.4f, 0.9f, 0.4f } });
387 entity->WorldCollidable(true);
388 ChunkIndex &index = chunks.MakeIndex(entity->ChunkCoords(), 6);
389 players.emplace_back(*entity, index);
390 return &players.back();
393 Entity &World::AddEntity() {
394 if (entities.empty()) {
395 entities.emplace_back();
396 entities.back().ID(1);
397 return entities.back();
399 if (entities.back().ID() < std::numeric_limits<std::uint32_t>::max()) {
400 std::uint32_t id = entities.back().ID() + 1;
401 entities.emplace_back();
402 entities.back().ID(id);
403 return entities.back();
405 std::uint32_t id = 1;
406 auto position = entities.begin();
407 auto end = entities.end();
408 while (position != end && position->ID() == id) {
412 auto entity = entities.emplace(position);
417 Entity *World::AddEntity(std::uint32_t id) {
418 if (entities.empty() || entities.back().ID() < id) {
419 entities.emplace_back();
420 entities.back().ID(id);
421 return &entities.back();
424 auto position = entities.begin();
425 auto end = entities.end();
426 while (position != end && position->ID() < id) {
429 if (position != end && position->ID() == id) {
432 auto entity = entities.emplace(position);
437 Entity &World::ForceAddEntity(std::uint32_t id) {
438 if (entities.empty() || entities.back().ID() < id) {
439 entities.emplace_back();
440 entities.back().ID(id);
441 return entities.back();
444 auto position = entities.begin();
445 auto end = entities.end();
446 while (position != end && position->ID() < id) {
449 if (position != end && position->ID() == id) {
452 auto entity = entities.emplace(position);
465 bool CandidateLess(const Candidate &a, const Candidate &b) {
466 return a.dist < b.dist;
469 std::vector<Candidate> candidates;
473 bool World::Intersection(
475 const ExactLocation::Coarse &reference,
480 for (Chunk &cur_chunk : chunks) {
482 if (cur_chunk.Intersection(ray, reference, cur_dist)) {
483 candidates.push_back({ &cur_chunk, cur_dist });
487 if (candidates.empty()) return false;
489 std::sort(candidates.begin(), candidates.end(), CandidateLess);
491 coll.chunk = nullptr;
493 coll.depth = std::numeric_limits<float>::infinity();
495 for (Candidate &cand : candidates) {
496 if (cand.dist > coll.depth) continue;
497 WorldCollision cur_coll;
498 if (cand.chunk->Intersection(ray, reference, cur_coll)) {
499 if (cur_coll.depth < coll.depth) {
508 bool World::Intersection(
510 const Entity &reference,
511 EntityCollision &coll
513 coll.entity = nullptr;
514 coll.depth = std::numeric_limits<float>::infinity();
515 for (Entity &cur_entity : entities) {
516 if (&cur_entity == &reference) {
520 glm::vec3 cur_normal;
521 if (blank::Intersection(ray, cur_entity.Bounds(), cur_entity.Transform(reference.ChunkCoords()), &cur_dist, &cur_normal)) {
522 // TODO: fine grained check goes here? maybe?
523 if (cur_dist < coll.depth) {
524 coll.entity = &cur_entity;
525 coll.depth = cur_dist;
526 coll.normal = cur_normal;
534 bool World::Intersection(const Entity &e, const EntityState &s, std::vector<WorldCollision> &col) {
535 // TODO: make special case for entities here and in Chunk::Intersection so entity's bounding radius
536 // doesn't have to be calculated over and over again (sqrt)
537 glm::ivec3 reference = s.pos.chunk;
538 glm::mat4 M = s.Transform(reference);
540 ExactLocation::Coarse begin(reference - 1);
541 ExactLocation::Coarse end(reference + 2);
544 for (ExactLocation::Coarse pos(begin); pos.z < end.y; ++pos.z) {
545 for (pos.y = begin.y; pos.y < end.y; ++pos.y) {
546 for (pos.x = begin.x; pos.x < end.x; ++pos.x) {
547 Chunk *chunk = chunks.Get(pos);
548 if (chunk && chunk->Intersection(e, M, chunk->Transform(reference), col)) {
557 bool World::Intersection(
560 const glm::ivec3 &reference,
561 std::vector<WorldCollision> &col
564 for (Chunk &cur_chunk : chunks) {
565 if (manhattan_radius(cur_chunk.Position() - reference) > 1) {
566 // chunk is not one of the 3x3x3 surrounding the entity
567 // since there's no entity which can extent over 16 blocks, they can be skipped
570 if (cur_chunk.Intersection(box, M, cur_chunk.Transform(reference), col)) {
577 void World::Update(int dt) {
578 float fdt(dt * 0.001f);
579 for (Entity &entity : entities) {
582 for (Entity &entity : entities) {
585 for (Player &player : players) {
588 for (auto iter = entities.begin(), end = entities.end(); iter != end;) {
589 if (iter->CanRemove()) {
590 iter = RemoveEntity(iter);
597 void World::Update(Entity &entity, float dt) {
598 EntityState state(entity.GetState());
600 EntityDerivative a(CalculateStep(entity, state, 0.0f, EntityDerivative()));
601 EntityDerivative b(CalculateStep(entity, state, dt * 0.5f, a));
602 EntityDerivative c(CalculateStep(entity, state, dt * 0.5f, b));
603 EntityDerivative d(CalculateStep(entity, state, dt, c));
606 constexpr float sixth = 1.0f / 6.0f;
607 f.position = sixth * ((a.position + 2.0f * (b.position + c.position)) + d.position);
608 f.velocity = sixth * ((a.velocity + 2.0f * (b.velocity + c.velocity)) + d.velocity);
610 state.pos.block += f.position * dt;
611 state.velocity += f.velocity * dt;
612 state.AdjustPosition();
614 entity.SetState(state);
617 EntityDerivative World::CalculateStep(
618 const Entity &entity,
619 const EntityState &cur,
621 const EntityDerivative &delta
623 EntityState next(cur);
624 next.pos.block += delta.position * dt;
625 next.velocity += delta.velocity * dt;
626 next.AdjustPosition();
628 if (dot(next.velocity, next.velocity) > entity.MaxVelocity() * entity.MaxVelocity()) {
629 next.velocity = normalize(next.velocity) * entity.MaxVelocity();
632 EntityDerivative out;
633 out.position = next.velocity;
634 out.velocity = CalculateForce(entity, next); // by mass = 1kg
638 glm::vec3 World::CalculateForce(
639 const Entity &entity,
640 const EntityState &state
642 glm::vec3 force(ControlForce(entity, state) + CollisionForce(entity, state) + Gravity(entity, state));
643 if (dot(force, force) > entity.MaxControlForce() * entity.MaxControlForce()) {
644 return normalize(force) * entity.MaxControlForce();
650 glm::vec3 World::ControlForce(
651 const Entity &entity,
652 const EntityState &state
654 return entity.ControlForce(state);
659 std::vector<WorldCollision> col;
663 glm::vec3 World::CollisionForce(
664 const Entity &entity,
665 const EntityState &state
668 if (entity.WorldCollidable() && Intersection(entity, state, col)) {
669 // determine displacement for each cardinal axis and move entity accordingly
670 glm::vec3 min_pen(0.0f);
671 glm::vec3 max_pen(0.0f);
672 for (const WorldCollision &c : col) {
673 if (!c.Blocks()) continue;
674 glm::vec3 local_pen(c.normal * c.depth);
675 // swap if neccessary (normal may point away from the entity)
676 if (dot(c.normal, state.RelativePosition(c.ChunkPos()) - c.BlockCoords()) > 0) {
679 min_pen = min(min_pen, local_pen);
680 max_pen = max(max_pen, local_pen);
682 glm::vec3 correction(0.0f);
683 // only apply correction for axes where penetration is only in one direction
684 for (std::size_t i = 0; i < 3; ++i) {
685 if (min_pen[i] < -std::numeric_limits<float>::epsilon()) {
686 if (max_pen[i] < std::numeric_limits<float>::epsilon()) {
687 correction[i] = -min_pen[i];
690 correction[i] = -max_pen[i];
693 // correction may be zero in which case normalize() returns NaNs
694 if (dot(correction, correction) < std::numeric_limits<float>::epsilon()) {
695 return glm::vec3(0.0f);
697 glm::vec3 normal(normalize(correction));
698 glm::vec3 normal_velocity(normal * dot(state.velocity, normal));
699 // apply force proportional to penetration
700 // use velocity projected onto normal as damper
701 constexpr float k = 1000.0f; // spring constant
702 constexpr float b = 10.0f; // damper constant
703 const glm::vec3 x(-correction); // endpoint displacement from equilibrium in m
704 const glm::vec3 v(normal_velocity); // relative velocity between endpoints in m/s
705 return (((-k) * x) - (b * v)); // times 1kg/s, in kg*m/s²
707 return glm::vec3(0.0f);
711 glm::vec3 World::Gravity(
712 const Entity &entity,
713 const EntityState &state
715 return glm::vec3(0.0f);
718 World::EntityHandle World::RemoveEntity(EntityHandle &eh) {
720 for (auto player = players.begin(), end = players.end(); player != end;) {
721 if (&player->GetEntity() == &*eh) {
722 chunks.UnregisterIndex(player->GetChunks());
723 player = players.erase(player);
729 return entities.erase(eh);
733 void World::Render(Viewport &viewport) {
734 DirectionalLighting &entity_prog = viewport.EntityProgram();
735 entity_prog.SetFogDensity(fog_density);
739 glm::vec3 ambient_col;
740 for (Entity &entity : entities) {
741 glm::mat4 M(entity.Transform(players.front().GetEntity().ChunkCoords()));
742 if (!CullTest(entity.Bounds(), entity_prog.GetVP() * M)) {
743 GetLight(entity, light_dir, light_col, ambient_col);
744 entity_prog.SetLightDirection(light_dir);
745 entity_prog.SetLightColor(light_col);
746 entity_prog.SetAmbientColor(ambient_col);
747 entity.Render(M, entity_prog);
752 // this should interpolate based on the fractional part of entity's block position
753 void World::GetLight(
759 Chunk *chunk = chunks.Get(e.ChunkCoords());
761 // chunk unavailable, so make it really dark and from
762 // some arbitrary direction
763 dir = glm::vec3(1.0f, 2.0f, 3.0f);
764 col = glm::vec3(0.025f); // ~0.8^15
767 glm::ivec3 base(e.Position());
768 int base_light = chunk->GetLight(base);
771 glm::ivec3 acc(0, 0, 0);
772 for (glm::ivec3 offset(-1, -1, -1); offset.z < 2; ++offset.z) {
773 for (offset.y = -1; offset.y < 2; ++offset.y) {
774 for (offset.x = -1; offset.x < 2; ++offset.x) {
775 BlockLookup block(chunk, base + offset);
777 // missing, just ignore it
780 // otherwise, accumulate the difference times direction
781 acc += offset * (base_light - block.GetLight());
782 max_light = std::max(max_light, block.GetLight());
783 min_light = std::min(min_light, block.GetLight());
788 col = glm::vec3(std::pow(0.8f, 15 - max_light));
789 amb = glm::vec3(std::pow(0.8f, 15 - min_light));
794 PrimitiveMesh::Buffer debug_buf;
798 void World::RenderDebug(Viewport &viewport) {
799 PrimitiveMesh debug_mesh;
800 PlainColor &prog = viewport.WorldColorProgram();
801 for (const Entity &entity : entities) {
802 debug_buf.OutlineBox(entity.Bounds(), glm::vec4(1.0f, 0.0f, 0.0f, 1.0f));
803 debug_mesh.Update(debug_buf);
804 prog.SetM(entity.Transform(players.front().GetEntity().ChunkCoords()));
805 debug_mesh.DrawLines();