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#include "simulation.h"
#include "consts.h"
#include "level.h"
void Simulation::tick(
double dt,
const Uint8* keystate)
{
for (id_type id : active_)
{
Entity& entity = entities_.at(id);
// Control
if (entity.controllable &&
!entity.moving)
{
if (keystate[SDL_SCANCODE_LSHIFT] || keystate[SDL_SCANCODE_RSHIFT])
{
Direction lookDir = Direction::none;
if (keystate[SDL_SCANCODE_LEFT])
{
lookDir = Direction::left;
}
else if (keystate[SDL_SCANCODE_UP])
{
lookDir = Direction::up;
}
else if (keystate[SDL_SCANCODE_RIGHT])
{
lookDir = Direction::right;
}
else if (keystate[SDL_SCANCODE_DOWN])
{
lookDir = Direction::down;
}
vec2s lookPos = posInDir(entity.gridPos, lookDir);
for (id_type blockId : getGridEntities(lookPos))
{
Entity& block = entities_.at(blockId);
if (!block.moving && block.canBePushedBy.count(ColliderType::player))
{
moveEntityOnGrid(blockId, lookDir);
}
}
} else {
if (keystate[SDL_SCANCODE_LEFT] &&
moveEntityOnGrid(id, Direction::left, true))
{
entity.shouldMoveTo = Direction::left;
}
else if (keystate[SDL_SCANCODE_UP] &&
moveEntityOnGrid(id, Direction::up, true))
{
entity.shouldMoveTo = Direction::up;
}
else if (keystate[SDL_SCANCODE_RIGHT] &&
moveEntityOnGrid(id, Direction::right, true))
{
entity.shouldMoveTo = Direction::right;
}
else if (keystate[SDL_SCANCODE_DOWN] &&
moveEntityOnGrid(id, Direction::down, true))
{
entity.shouldMoveTo = Direction::down;
}
else
{
entity.shouldMoveTo = Direction::none;
}
if (entity.shouldMoveTo != Direction::none)
{
moveEntityOnGrid(id, entity.shouldMoveTo);
}
}
}
// Collision
// Movement
if (entity.moving)
{
entity.movementTween += entity.speed * dt;
if (entity.movementTween >= 1.0)
{
entity.moving = false;
setGridPos(id, entity.destPos);
}
}
if (entity.moving)
{
entity.pos.x() =
TILE_SIZE.x() * entity.destPos.x() * entity.movementTween +
TILE_SIZE.x() * entity.gridPos.x() * (1.0 - entity.movementTween);
entity.pos.y() =
TILE_SIZE.y() * entity.destPos.y() * entity.movementTween +
TILE_SIZE.y() * entity.gridPos.y() * (1.0 - entity.movementTween);
} else {
entity.pos = TILE_SIZE * entity.gridPos;
}
}
}
Simulation::id_type Simulation::emplaceEntity()
{
id_type nextId;
if (!available_.empty())
{
nextId = available_.front();
available_.pop_front();
entities_.at(nextId) = Entity();
} else {
nextId = entities_.size();
entities_.emplace_back();
}
active_.insert(nextId);
return nextId;
}
void Simulation::deleteEntity(id_type id)
{
available_.push_back(id);
active_.erase(id);
}
void Simulation::setGridPos(id_type id, vec2s pos)
{
Entity& entity = entities_.at(id);
size_t oldPosIndex =
entity.gridPos.x() + entity.gridPos.y() * level_.getSize().w();
gridCache_[oldPosIndex].erase(id);
entity.gridPos = pos;
size_t newPosIndex =
entity.gridPos.x() + entity.gridPos.y() * level_.getSize().w();
gridCache_[newPosIndex].insert(id);
}
const std::unordered_set<Simulation::id_type>&
Simulation::getGridEntities(vec2s pos) const
{
size_t posIndex = pos.x() + pos.y() * level_.getSize().w();
return gridCache_[posIndex];
}
bool Simulation::moveEntityOnGrid(
id_type id,
Direction moveDir,
bool validate)
{
bool actuallyMove = true;
Entity& entity = entities_.at(id);
vec2s shouldMoveTo = posInDir(entity.gridPos, moveDir);
switch (moveDir)
{
case Direction::left:
{
if (entity.gridPos.x() == 0)
{
return false;
}
break;
}
case Direction::right:
{
if (entity.gridPos.x() == level_.getSize().w() - 1)
{
return false;
}
break;
}
case Direction::up:
{
if (entity.gridPos.y() == 0)
{
return false;
}
break;
}
case Direction::down:
{
if (entity.gridPos.y() == level_.getSize().h() - 1)
{
return false;
}
break;
}
}
if (!level_.getTileset().canEntityMoveTo(
entity.colliderType,
level_.at(shouldMoveTo)))
{
return false;
}
for (id_type blockId : getGridEntities(shouldMoveTo))
{
Entity& block = entities_.at(blockId);
if (!block.moving)
{
if (!block.canBePushedBy.count(entity.colliderType))
{
return false;
}
if (!moveEntityOnGrid(blockId, moveDir, validate))
{
return false;
}
}
double entityTimeLeft = 1.0 / entity.speed;
double blockTimeLeft = (1.0 - block.movementTween) / block.speed;
if (entityTimeLeft < blockTimeLeft)
{
actuallyMove = false;
}
}
if (!validate && actuallyMove)
{
entity.moving = true;
entity.destPos = shouldMoveTo;
entity.movementTween = 0.0;
}
return true;
}
vec2s Simulation::posInDir(vec2s orig, Direction dir)
{
switch (dir)
{
case Direction::left: return orig - vec2s { 1, 0 };
case Direction::right: return orig + vec2s { 1, 0 };
case Direction::up: return orig - vec2s { 0, 1 };
case Direction::down: return orig + vec2s { 0, 1 };
case Direction::none: return orig;
}
}
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