58 files changed, 2439 insertions, 2051 deletions

@@ -0,0 +1,12 @@
+#ifndef ALGORITHMS_H_1DDC517E
+#define ALGORITHMS_H_1DDC517E
+
+template< typename ContainerT, typename PredicateT >
+void erase_if( ContainerT& items, const PredicateT& predicate ) {
+  for( auto it = items.begin(); it != items.end(); ) {
+    if( predicate(*it) ) it = items.erase(it);
+    else ++it;
+  }
+};
+
+#endif /* end of include guard: ALGORITHMS_H_1DDC517E */
@@ -0,0 +1,35 @@
+#include "animation.h"
+
+AnimationSet::AnimationSet(
+  Texture texture,
+  int frameWidth,
+  int frameHeight,
+  int framesAcross) :
+    texture_(std::move(texture)),
+    frameWidth_(frameWidth),
+    frameHeight_(frameHeight),
+    framesAcross_(framesAcross)
+{
+}
+
+void AnimationSet::emplaceAnimation(
+  std::string animation,
+  size_t firstFrame,
+  size_t numFrames,
+  size_t delay)
+{
+  animations_.emplace(
+    std::piecewise_construct,
+    std::make_tuple(animation),
+    std::make_tuple(firstFrame, numFrames, delay));
+}
+
+Rectangle AnimationSet::getFrameRect(int frame) const
+{
+  return {
+    frameWidth_ * (frame % framesAcross_),
+    frameHeight_ * (frame / framesAcross_),
+    frameWidth_,
+    frameHeight_
+  };
+}
@@ -0,0 +1,100 @@
+#ifndef ANIMATION_H_74EB0901
+#define ANIMATION_H_74EB0901
+
+#include "renderer.h"
+#include <string>
+#include <map>
+#include <stdexcept>
+
+class Animation {
+public:
+
+  Animation(
+    size_t firstFrame,
+    size_t numFrames,
+    size_t delay) :
+      firstFrame_(firstFrame),
+      numFrames_(numFrames),
+      delay_(delay)
+  {
+  }
+
+  inline size_t getFirstFrame() const
+  {
+    return firstFrame_;
+  }
+
+  inline size_t getNumFrames() const
+  {
+    return numFrames_;
+  }
+
+  inline size_t getDelay() const
+  {
+    return delay_;
+  }
+
+private:
+
+  size_t firstFrame_;
+  size_t numFrames_;
+  size_t delay_;
+};
+
+class AnimationSet {
+public:
+
+  AnimationSet(
+    Texture texture,
+    int frameWidth,
+    int frameHeight,
+    int framesAcross);
+
+  void emplaceAnimation(
+    std::string animation,
+    size_t firstFrame,
+    size_t numFrames,
+    size_t delay);
+
+  inline const Animation& getAnimation(std::string animation) const
+  {
+    if (!animations_.count(animation))
+    {
+      throw std::invalid_argument("Animation does not exist");
+    }
+
+    return animations_.at(animation);
+  }
+
+  inline const Texture& getTexture() const
+  {
+    return texture_;
+  }
+
+  inline int getFrameWidth() const
+  {
+    return frameWidth_;
+  }
+
+  inline int getFrameHeight() const
+  {
+    return frameHeight_;
+  }
+
+  inline int getFramesAcross() const
+  {
+    return framesAcross_;
+  }
+
+  Rectangle getFrameRect(int frame) const;
+
+private:
+
+  std::map<std::string, Animation> animations_;
+  Texture texture_;
+  int frameWidth_;
+  int frameHeight_;
+  int framesAcross_;
+};
+
+#endif /* end of include guard: ANIMATION_H_74EB0901 */
@@ -0,0 +1,11 @@
+#ifndef COMPONENT_H_F0CE4573
+#define COMPONENT_H_F0CE4573
+
+class Component {
+public:
+
+  virtual ~Component() = default;
+
+};
+
+#endif /* end of include guard: COMPONENT_H_F0CE4573 */
@@ -1,142 +0,0 @@
-#include "ai.h"
-#include <cstdlib>
-#include "entity.h"
-
-void AIActionContainer::addAction(std::shared_ptr<AIAction> action)
-{
-  actions.push_back(action);
-}
-
-void AIActionContainer::start(Game& game, Entity& entity)
-{
-  currentAction = begin(actions);
-  
-  if (currentAction != end(actions))
-  {
-    (*currentAction)->start(game, entity);
-  }
-}
-
-void AIActionContainer::perform(Game& game, Entity& entity, double dt)
-{
-  if (!isDone())
-  {
-    (*currentAction)->perform(game, entity, dt);
-  
-    if ((*currentAction)->isDone())
-    {
-      currentAction++;
-      
-      if (!isDone())
-      {
-        (*currentAction)->start(game, entity);
-      }
-    }
-  }
-}
-
-bool AIActionContainer::isDone() const
-{
-  return currentAction == end(actions);
-}
-
-AI::AI(int chance)
-{
-  this->chance = chance;
-}
-
-int AI::getChance() const
-{
-  return chance;
-}
-
-AI& AIComponent::emplaceAI(int chance)
-{
-  maxChance += chance;
-  ais.emplace_back(chance);
-  
-  return ais.back();
-}
-
-void AIComponent::tick(Game& game, Entity& entity, double dt)
-{
-  if (currentAI == nullptr)
-  {
-    int toChoose = rand() % maxChance;
-    for (auto& ai : ais)
-    {
-      if (toChoose < ai.getChance())
-      {
-        currentAI = &ai;
-        break;
-      } else {
-        toChoose -= ai.getChance();
-      }
-    }
-    
-    if (currentAI != nullptr)
-    {
-      currentAI->start(game, entity);
-    }
-  }
-  
-  if (currentAI != nullptr)
-  {
-    currentAI->perform(game, entity, dt);
-  
-    if (currentAI->isDone())
-    {
-      currentAI = nullptr;
-    }
-  }
-}
-
-MoveAIAction::MoveAIAction(Direction dir, int len, int speed)
-{
-  this->dir = dir;
-  this->len = len;
-  this->speed = speed;
-}
-
-void MoveAIAction::start(Game& game, Entity& entity)
-{
-  remaining = len;
-}
-
-void MoveAIAction::perform(Game&, Entity& entity, double dt)
-{
-  double dist = dt * speed;
-  remaining -= dist;
-  
-  switch (dir)
-  {
-    case Direction::Left:
-    {
-      entity.position.first -= dist;
-      break;
-    }
-    
-    case Direction::Right:
-    {
-      entity.position.first += dist;
-      break;
-    }
-    
-    case Direction::Up:
-    {
-      entity.position.second -= dist;
-      break;
-    }
-    
-    case Direction::Down:
-    {
-      entity.position.second += dist;
-      break;
-    }
-  }
-}
-
-bool MoveAIAction::isDone() const
-{
-  return remaining <= 0.0;
-}
@@ -1,73 +0,0 @@
-#ifndef AI_H
-#define AI_H
-
-#include <list>
-#include <map>
-#include <string>
-#include <memory>
-
-#include "entity.h"
-
-class AIAction {
-  public:
-    virtual void start(Game& game, Entity& entity) = 0;
-    virtual void perform(Game& game, Entity& entity, double dt) = 0;
-    virtual bool isDone() const = 0;
-};
-
-class AIActionContainer {
-  public:
-    void addAction(std::shared_ptr<AIAction> action);
-    virtual void start(Game& game, Entity& entity);
-    virtual void perform(Game& game, Entity& entity, double dt);
-    virtual bool isDone() const;
-  
-  private:
-    std::list<std::shared_ptr<AIAction>> actions;
-    std::list<std::shared_ptr<AIAction>>::iterator currentAction {end(actions)};
-};
-
-class AI : public AIActionContainer {
-  public:
-    AI(int chance);
-    
-    int getChance() const;
-    
-  private:
-    int chance;
-};
-
-class AIComponent : public Component {
-  public:
-    AI& emplaceAI(int chance);
-    void tick(Game& game, Entity& entity, double dt);
-
-  private:
-    int maxChance = 0;
-    std::list<AI> ais;
-    AI* currentAI = nullptr;
-};
-
-class MoveAIAction : public AIAction {
-  public:
-    enum class Direction {
-      Left,
-      Right,
-      Up,
-      Down
-    };
-    
-    MoveAIAction(Direction dir, int len, int speed);
-    
-    void start(Game& game, Entity& entity);
-    void perform(Game& game, Entity& entity, double dt);
-    bool isDone() const;
-    
-  private:
-    Direction dir;
-    int len;
-    int speed;
-    double remaining;
-};
-
-#endif /* end of include guard: AI_H */
@@ -0,0 +1,62 @@
+#ifndef SPRITE_RENDERABLE_H_D3AACBBF
+#define SPRITE_RENDERABLE_H_D3AACBBF
+
+#include "component.h"
+#include "animation.h"
+#include <string>
+
+class AnimatableComponent : public Component {
+public:
+
+  AnimatableComponent(
+    AnimationSet animationSet,
+    std::string animation) :
+      animationSet_(std::move(animationSet)),
+      animation_(std::move(animation))
+  {
+  }
+
+  inline size_t getFrame() const
+  {
+    return frame_;
+  }
+
+  inline void setFrame(size_t v)
+  {
+    frame_ = v;
+  }
+
+  inline size_t getCountdown() const
+  {
+    return countdown_;
+  }
+
+  inline void setCountdown(size_t v)
+  {
+    countdown_ = v;
+  }
+
+  inline const AnimationSet& getAnimationSet() const
+  {
+    return animationSet_;
+  }
+
+  inline const Animation& getAnimation() const
+  {
+    return animationSet_.getAnimation(animation_);
+  }
+
+  inline void setAnimation(std::string animation)
+  {
+    animation_ = std::move(animation);
+  }
+
+private:
+
+  AnimationSet animationSet_;
+  std::string animation_;
+  size_t frame_ = 0;
+  size_t countdown_ = 0;
+};
+
+#endif /* end of include guard: SPRITE_RENDERABLE_H_D3AACBBF */
@@ -0,0 +1,92 @@
+#ifndef CONTROLLABLE_H_4E0B85B4
+#define CONTROLLABLE_H_4E0B85B4
+
+#include "component.h"
+#include "renderer.h"
+
+class ControllableComponent : public Component {
+public:
+
+  inline int getLeftKey() const
+  {
+    return leftKey_;
+  }
+
+  inline void setLeftKey(int k)
+  {
+    leftKey_ = k;
+  }
+
+  inline int getRightKey() const
+  {
+    return rightKey_;
+  }
+
+  inline void setRightKey(int k)
+  {
+    rightKey_ = k;
+  }
+
+  inline int getJumpKey() const
+  {
+    return jumpKey_;
+  }
+
+  inline void setJumpKey(int k)
+  {
+    jumpKey_ = k;
+  }
+
+  inline int getDropKey() const
+  {
+    return dropKey_;
+  }
+
+  inline void setDropKey(int k)
+  {
+    dropKey_ = k;
+  }
+
+  inline bool isFrozen() const
+  {
+    return frozen_;
+  }
+
+  inline void setFrozen(bool f)
+  {
+    frozen_ = f;
+  }
+
+  inline bool isHoldingLeft() const
+  {
+    return holdingLeft_;
+  }
+
+  inline void setHoldingLeft(bool f)
+  {
+    holdingLeft_ = f;
+  }
+
+  inline bool isHoldingRight() const
+  {
+    return holdingRight_;
+  }
+
+  inline void setHoldingRight(bool f)
+  {
+    holdingRight_ = f;
+  }
+
+private:
+
+  int leftKey_ = GLFW_KEY_LEFT;
+  int rightKey_ = GLFW_KEY_RIGHT;
+  int jumpKey_ = GLFW_KEY_UP;
+  int dropKey_ = GLFW_KEY_DOWN;
+
+  bool frozen_ = false;
+  bool holdingLeft_ = false;
+  bool holdingRight_ = false;
+};
+
+#endif /* end of include guard: CONTROLLABLE_H_4E0B85B4 */
@@ -1,241 +0,0 @@
-#include "map_collision.h"
-#include "map.h"
-#include "game.h"
-#include "consts.h"
-
-MapCollisionComponent::MapCollisionComponent(const Map& map) : map(map)
-{
-  addCollision(-6, 0, MAP_HEIGHT*TILE_HEIGHT, Direction::left, collisionFromMoveType(map.getAdjacent(Map::MoveDir::Left).type));
-  addCollision(GAME_WIDTH+6, 0, MAP_HEIGHT*TILE_HEIGHT, Direction::right, collisionFromMoveType(map.getAdjacent(Map::MoveDir::Right).type));
-  addCollision(-6, 0, GAME_WIDTH, Direction::up, collisionFromMoveType(map.getAdjacent(Map::MoveDir::Up).type));
-  addCollision(MAP_HEIGHT*TILE_HEIGHT+6, 0, GAME_WIDTH, Direction::down, collisionFromMoveType(map.getAdjacent(Map::MoveDir::Down).type));
-  
-  for (int i=0; i<MAP_WIDTH*MAP_HEIGHT; i++)
-  {
-    int x = i % MAP_WIDTH;
-    int y = i / MAP_WIDTH;
-    int tile = map.getMapdata()[i];
-    
-    if ((tile > 0) && (tile < 28) && (!((tile >= 5) && (tile <= 7))))
-    {
-      addCollision(x*TILE_WIDTH, y*TILE_HEIGHT, (y+1)*TILE_HEIGHT, Direction::right, Collision::Type::wall);
-      addCollision((x+1)*TILE_WIDTH, y*TILE_HEIGHT, (y+1)*TILE_HEIGHT, Direction::left, Collision::Type::wall);
-      addCollision(y*TILE_HEIGHT, x*TILE_WIDTH, (x+1)*TILE_WIDTH, Direction::down, Collision::Type::wall);
-      addCollision((y+1)*TILE_HEIGHT, x*TILE_WIDTH, (x+1)*TILE_WIDTH, Direction::up, Collision::Type::wall);
-    } else if ((tile >= 5) && (tile <= 7))
-    {
-      addCollision(y*TILE_HEIGHT, x*TILE_WIDTH, (x+1)*TILE_WIDTH, Direction::down, Collision::Type::platform);
-    } else if (tile == 42)
-    {
-      addCollision(y*TILE_HEIGHT, x*TILE_WIDTH, (x+1)*TILE_WIDTH, Direction::down, Collision::Type::danger);
-    }
-  }
-}
-
-void MapCollisionComponent::addCollision(double axis, double lower, double
-   upper, Direction dir, Collision::Type type)
-{
-  std::list<Collision>::iterator it;
-  
-  switch (dir)
-  {
-    case Direction::up:
-      it = up_collisions.begin();
-      for (; it!=up_collisions.end(); it++)
-      {
-        if (it->axis < axis) break;
-      }
-    
-      up_collisions.insert(it, {axis, lower, upper, type});
-      
-      break;
-    case Direction::down:
-      it = down_collisions.begin();
-      for (; it!=down_collisions.end(); it++)
-      {
-        if (it->axis > axis) break;
-      }
-    
-      down_collisions.insert(it, {axis, lower, upper, type});
-      
-      break;
-    case Direction::left:
-      it = left_collisions.begin();
-      for (; it!=left_collisions.end(); it++)
-      {
-        if (it->axis < axis) break;
-      }
-  
-      left_collisions.insert(it, {axis, lower, upper, type});
-      
-      break;
-    case Direction::right:
-      it = right_collisions.begin();
-      for (; it!=right_collisions.end(); it++)
-      {
-        if (it->axis > axis) break;
-      }
-  
-      right_collisions.insert(it, {axis, lower, upper, type});
-      
-      break;
-  }
-}
-
-void MapCollisionComponent::detectCollision(Game& game, Entity&, Entity& collider, std::pair<double, double> old_position)
-{
-  if (collider.position.first < old_position.first)
-  {
-    for (auto collision : left_collisions)
-    {
-      if (collision.axis > old_position.first) continue;
-      if (collision.axis < collider.position.first) break;
-  
-      if ((old_position.second+collider.size.second > collision.lower) && (old_position.second < collision.upper))
-      {
-        // We have a collision!
-        processCollision(game, collider, collision, Direction::left, old_position);
-    
-        break;
-      }
-    }
-  } else if (collider.position.first > old_position.first)
-  {
-    for (auto collision : right_collisions)
-    {
-      if (collision.axis < old_position.first+collider.size.first) continue;
-      if (collision.axis > collider.position.first+collider.size.first) break;
-  
-      if ((old_position.second+collider.size.second > collision.lower) && (old_position.second < collision.upper))
-      {
-        // We have a collision!
-        processCollision(game, collider, collision, Direction::right, old_position);
-    
-        break;
-      }
-    }
-  }
-  
-  if (collider.position.second < old_position.second)
-  {
-    for (auto collision : up_collisions)
-    {
-      if (collision.axis > old_position.second) continue;
-      if (collision.axis < collider.position.second) break;
-  
-      if ((collider.position.first+collider.size.first > collision.lower) && (collider.position.first < collision.upper))
-      {
-        // We have a collision!
-        processCollision(game, collider, collision, Direction::up, old_position);
-    
-        break;
-      }
-    }
-  } else if (collider.position.second > old_position.second)
-  {
-    for (auto collision : down_collisions)
-    {
-      if (collision.axis < old_position.second+collider.size.second) continue;
-      if (collision.axis > collider.position.second+collider.size.second) break;
-
-      if ((collider.position.first+collider.size.first > collision.lower) && (collider.position.first < collision.upper))
-      {
-        // We have a collision!
-        processCollision(game, collider, collision, Direction::down, old_position);
-        
-        break;
-      }
-    }
-  }
-}
-
-void MapCollisionComponent::processCollision(Game& game, Entity& collider, Collision collision, Direction dir, std::pair<double, double> old_position)
-{
-  if (collision.type == Collision::Type::wall)
-  {
-    if (dir == Direction::left)
-    {
-      collider.position.first = collision.axis;
-      
-      Message msg(Message::Type::setHorizontalVelocity);
-      msg.velocity = 0.0;
-      collider.send(game, msg);
-    } else if (dir == Direction::right)
-    {
-      collider.position.first = collision.axis - collider.size.first;
-
-      Message msg(Message::Type::setHorizontalVelocity);
-      msg.velocity = 0.0;
-      collider.send(game, msg);
-    } else if (dir == Direction::up)
-    {
-      collider.position.second = collision.axis;
-
-      Message msg(Message::Type::setVerticalVelocity);
-      msg.velocity = 0.0;
-      collider.send(game, msg);
-    } else if (dir == Direction::down)
-    {
-      collider.position.second = collision.axis - collider.size.second;
-      collider.send(game, Message::Type::hitTheGround);
-    }
-  } else if (collision.type == Collision::Type::wrap)
-  {
-    if (dir == Direction::left)
-    {
-      collider.position.first = GAME_WIDTH-collider.size.first/2;
-    } else if (dir == Direction::right)
-    {
-      collider.position.first = -collider.size.first/2;
-    } else if (dir == Direction::up)
-    {
-      collider.position.second = GAME_HEIGHT-collider.size.second/2-1;
-    } else if (dir == Direction::down)
-    {
-      collider.position.second = -collider.size.second/2;
-    }
-  } else if (collision.type == Collision::Type::teleport)
-  {
-    if (dir == Direction::left)
-    {
-      game.loadMap(game.getWorld().getMap(map.getAdjacent(Map::MoveDir::Left).map), std::make_pair(GAME_WIDTH-collider.size.first/2, old_position.second));
-    } else if (dir == Direction::right)
-    {
-      game.loadMap(game.getWorld().getMap(map.getAdjacent(Map::MoveDir::Right).map), std::make_pair(-collider.size.first/2, old_position.second));
-    } else if (dir == Direction::up)
-    {
-      game.loadMap(game.getWorld().getMap(map.getAdjacent(Map::MoveDir::Up).map), std::make_pair(old_position.first, MAP_HEIGHT*TILE_HEIGHT-collider.size.second/2));
-    } else if (dir == Direction::down)
-    {
-      game.loadMap(game.getWorld().getMap(map.getAdjacent(Map::MoveDir::Down).map), std::make_pair(old_position.first, -collider.size.second/2));
-    }
-  } else if (collision.type == Collision::Type::reverse)
-  {
-    // TODO reverse
-    if (dir == Direction::right)
-    {
-      collider.position.first = collision.axis - collider.size.first;
-      collider.send(game, Message::Type::walkLeft);
-    }
-  } else if (collision.type == Collision::Type::platform)
-  {
-    Message msg(Message::Type::drop);
-    msg.dropAxis = collision.axis;
-
-    collider.send(game, msg);
-  } else if (collision.type == Collision::Type::danger)
-  {
-    game.playerDie();
-  }
-}
-
-MapCollisionComponent::Collision::Type MapCollisionComponent::collisionFromMoveType(Map::MoveType type)
-{
-  switch (type)
-  {
-    case Map::MoveType::Wall: return Collision::Type::wall;
-    case Map::MoveType::Wrap: return Collision::Type::wrap;
-    case Map::MoveType::Warp: return Collision::Type::teleport;
-    case Map::MoveType::ReverseWarp: return Collision::Type::reverse;
-  }
-}
@@ -1,47 +0,0 @@
-#ifndef MAP_COLLISION_H
-#define MAP_COLLISION_H
-
-#include "entity.h"
-#include "map.h"
-#include <list>
-
-class Game;
-
-class MapCollisionComponent : public Component {
-  public:
-    MapCollisionComponent(const Map& map);
-    void detectCollision(Game& game, Entity& entity, Entity& collider, std::pair<double, double> old_position);
-    
-  private:
-    enum class Direction {
-      up, left, down, right
-    };
-
-    struct Collision {
-      enum class Type {
-        wall,
-        wrap,
-        teleport,
-        reverse,
-        platform,
-        danger
-      };
-      
-      double axis;
-      double lower;
-      double upper;
-      Type type;
-    };
-    
-    void addCollision(double axis, double lower, double upper, Direction dir, Collision::Type type);
-    void processCollision(Game& game, Entity& collider, Collision collision, Direction dir, std::pair<double, double> old_position);
-    Collision::Type collisionFromMoveType(Map::MoveType type);
-    
-    std::list<Collision> left_collisions;
-    std::list<Collision> right_collisions;
-    std::list<Collision> up_collisions;
-    std::list<Collision> down_collisions;
-    const Map& map;
-};
-
-#endif
@@ -1,40 +0,0 @@
-#include "map_render.h"
-#include "map.h"
-#include "game.h"
-#include "consts.h"
-
-MapRenderComponent::MapRenderComponent(const Map& map) : screen(GAME_WIDTH, GAME_HEIGHT)
-{
-  screen.fill(screen.entirety(), 0, 0, 0);
-  
-  Texture tiles("res/tiles.png");
-  
-  for (int i=0; i<MAP_WIDTH*MAP_HEIGHT; i++)
-  {
-    int tile = map.getMapdata()[i];
-    int x = i % MAP_WIDTH;
-    int y = i / MAP_WIDTH;
-    Rectangle dst {x*TILE_WIDTH, y*TILE_HEIGHT, TILE_WIDTH, TILE_HEIGHT};
-    Rectangle src {tile%8*TILE_WIDTH, tile/8*TILE_HEIGHT, TILE_WIDTH, TILE_HEIGHT};
-
-    if (tile > 0)
-    {
-      screen.blit(tiles, src, dst);
-    }
-  }
-  
-  Texture font("res/font.bmp");
-  std::string map_name = map.getTitle();
-  int start_x = (40/2) - (map_name.length()/2);
-  for (size_t i=0; i<map_name.length(); i++)
-  {
-    Rectangle srcRect {map_name[i] % 16 * 8, map_name[i] / 16 * 8, 8, 8};
-    Rectangle dstRect {(start_x + (int)i)*8, 24*8, 8, 8};
-    screen.blit(font, srcRect, dstRect);
-  }
-}
-
-void MapRenderComponent::render(Game&, Entity&, Texture& buffer)
-{
-  buffer.blit(screen, screen.entirety(), buffer.entirety());
-}
@@ -1,19 +0,0 @@
-#ifndef MAP_RENDER_H
-#define MAP_RENDER_H
-
-#include "entity.h"
-#include "renderer.h"
-
-class Map;
-class Game;
-
-class MapRenderComponent : public Component {
-  public:
-    MapRenderComponent(const Map& map);
-    void render(Game& game, Entity& entity, Texture& buffer);
-    
-  private:
-    Texture screen;
-};
-
-#endif
@@ -0,0 +1,146 @@
+#ifndef MAPPABLE_H_0B0316FB
+#define MAPPABLE_H_0B0316FB
+
+#include <map>
+#include "component.h"
+#include "renderer.h"
+#include "map.h"
+
+class MappableComponent : public Component {
+public:
+
+  class Boundary {
+  public:
+
+    enum class Type {
+      wall,
+      wrap,
+      teleport,
+      reverse,
+      platform,
+      danger
+    };
+
+    Boundary(
+      double axis,
+      double lower,
+      double upper,
+      Type type) :
+        axis_(axis),
+        lower_(lower),
+        upper_(upper),
+        type_(type)
+    {
+    }
+
+    inline double getAxis() const
+    {
+      return axis_;
+    }
+
+    inline double getLower() const
+    {
+      return lower_;
+    }
+
+    inline double getUpper() const
+    {
+      return upper_;
+    }
+
+    inline Type getType() const
+    {
+      return type_;
+    }
+
+  private:
+
+    double axis_;
+    double lower_;
+    double upper_;
+    Type type_;
+  };
+
+  MappableComponent(
+    Texture tileset,
+    Texture font) :
+      tileset_(std::move(tileset)),
+      font_(std::move(font))
+  {
+  }
+
+  using asc_boundaries_type =
+    std::multimap<
+      double,
+      Boundary,
+      std::less<double>>;
+
+  using desc_boundaries_type =
+    std::multimap<
+      double,
+      Boundary,
+      std::greater<double>>;
+
+  inline size_t getMapId() const
+  {
+    return mapId_;
+  }
+
+  inline void setMapId(size_t v)
+  {
+    mapId_ = v;
+  }
+
+  inline desc_boundaries_type& getLeftBoundaries()
+  {
+    return leftBoundaries_;
+  }
+
+  inline asc_boundaries_type& getRightBoundaries()
+  {
+    return rightBoundaries_;
+  }
+
+  inline desc_boundaries_type& getUpBoundaries()
+  {
+    return upBoundaries_;
+  }
+
+  inline asc_boundaries_type& getDownBoundaries()
+  {
+    return downBoundaries_;
+  }
+
+  inline const Texture& getTileset() const
+  {
+    return tileset_;
+  }
+
+  inline void setTileset(Texture v)
+  {
+    tileset_ = std::move(v);
+  }
+
+  inline const Texture& getFont() const
+  {
+    return font_;
+  }
+
+  inline void setFont(Texture v)
+  {
+    font_ = std::move(v);
+  }
+
+private:
+
+  size_t mapId_ = -1;
+
+  desc_boundaries_type leftBoundaries_;
+  asc_boundaries_type rightBoundaries_;
+  desc_boundaries_type upBoundaries_;
+  asc_boundaries_type downBoundaries_;
+  Texture tileset_;
+  Texture font_;
+};
+
+#endif /* end of include guard: MAPPABLE_H_0B0316FB */
@@ -0,0 +1,69 @@
+#ifndef ORIENTABLE_H_EDB6C4A1
+#define ORIENTABLE_H_EDB6C4A1
+
+#include "component.h"
+
+class OrientableComponent : public Component {
+public:
+
+  enum class WalkState {
+    still,
+    left,
+    right
+  };
+
+  enum class DropState {
+    none,
+    ready,
+    active
+  };
+
+  inline bool isFacingRight() const
+  {
+    return facingRight_;
+  }
+
+  inline void setFacingRight(bool v)
+  {
+    facingRight_ = v;
+  }
+
+  inline WalkState getWalkState() const
+  {
+    return walkState_;
+  }
+
+  inline void setWalkState(WalkState v)
+  {
+    walkState_ = v;
+  }
+
+  inline bool isJumping() const
+  {
+    return jumping_;
+  }
+
+  inline void setJumping(bool v)
+  {
+    jumping_ = v;
+  }
+
+  inline DropState getDropState() const
+  {
+    return dropState_;
+  }
+
+  inline void setDropState(DropState v)
+  {
+    dropState_ = v;
+  }
+
+private:
+
+  bool facingRight_ = false;
+  WalkState walkState_ = WalkState::still;
+  bool jumping_ = false;
+  DropState dropState_ = DropState::none;
+};
+
+#endif /* end of include guard: ORIENTABLE_H_EDB6C4A1 */
@@ -1,66 +0,0 @@
-#include "physics_body.h"
-#include "game.h"
-#include "consts.h"
-
-void PhysicsBodyComponent::receive(Game&, Entity&, const Message& msg)
-{
-  if (msg.type == Message::Type::walkLeft)
-  {
-    velocity.first = -90;
-  } else if (msg.type == Message::Type::walkRight)
-  {
-    velocity.first = 90;
-  } else if (msg.type == Message::Type::stopWalking)
-  {
-    velocity.first = 0.0;
-  } else if (msg.type == Message::Type::setHorizontalVelocity)
-  {
-    velocity.first = msg.velocity;
-  } else if (msg.type == Message::Type::setVerticalVelocity)
-  {
-    velocity.second = msg.velocity;
-  }
-}
-
-void PhysicsBodyComponent::tick(Game&, Entity& entity, double dt)
-{
-  // Accelerate
-  velocity.first += accel.first * dt;
-  velocity.second += accel.second * dt;
-  
-  // Terminal velocity
-#define TERMINAL_VELOCITY_X (2 * TILE_WIDTH * FRAMES_PER_SECOND)
-#define TERMINAL_VELOCITY_Y (2 * TILE_HEIGHT * FRAMES_PER_SECOND)
-  if (velocity.first < -TERMINAL_VELOCITY_X) velocity.first = -TERMINAL_VELOCITY_X;
-  if (velocity.first > TERMINAL_VELOCITY_X) velocity.first = TERMINAL_VELOCITY_X;
-  if (velocity.second < -TERMINAL_VELOCITY_Y) velocity.second = -TERMINAL_VELOCITY_Y;
-  if (velocity.second > TERMINAL_VELOCITY_Y) velocity.second = TERMINAL_VELOCITY_Y;
-  
-  // Do the movement
-  entity.position.first += velocity.first * dt;
-  entity.position.second += velocity.second * dt;
-}
-
-void PhysicsBodyComponent::detectCollision(Game& game, Entity& entity, Entity& collider, std::pair<double, double> old_position)
-{
-  // If already colliding, do nothing!
-  if ((old_position.first + collider.size.first > entity.position.first)
-    && (old_position.first < entity.position.first + entity.size.first)
-    && (old_position.second + collider.size.second > entity.position.second)
-    && (old_position.second < entity.position.second + entity.size.second))
-  {
-    return;
-  }
-  
-  // If newly colliding, SHOCK AND HORROR!
-  if ((collider.position.first + collider.size.first > entity.position.first)
-    && (collider.position.first < entity.position.first + entity.size.first)
-    && (collider.position.second + collider.size.second > entity.position.second)
-    && (collider.position.second < entity.position.second + entity.size.second))
-  {
-    Message msg(Message::Type::collision);
-    msg.collisionEntity = &collider;
-    
-    entity.send(game, msg);
-  }
-}
@@ -1,20 +0,0 @@
-#ifndef PHYSICS_BODY_H
-#define PHYSICS_BODY_H
-
-#include "entity.h"
-#include <utility>
-
-class Game;
-
-class PhysicsBodyComponent : public Component {
-  public:
-    void receive(Game& game, Entity& entity, const Message& msg);
-    void tick(Game& game, Entity& entity, double dt);
-    void detectCollision(Game& game, Entity& entity, Entity& collider, std::pair<double, double> old_position);
-    
-  protected:    
-    std::pair<double, double> velocity;
-    std::pair<double, double> accel;
-};
-
-#endif
@@ -1,118 +0,0 @@
-#include "player_physics.h"
-#include "muxer.h"
-#include "game.h"
-#include "consts.h"
-
-#define JUMP_VELOCITY(h, l) (-2 * (h) / (l))
-#define JUMP_GRAVITY(h, l) (2 * ((h) / (l)) / (l))
-
-PlayerPhysicsComponent::PlayerPhysicsComponent()
-{
-  jump_velocity = JUMP_VELOCITY(TILE_HEIGHT*4.5, 0.3);
-  jump_gravity = JUMP_GRAVITY(TILE_HEIGHT*4.5, 0.3);
-  jump_gravity_short = JUMP_GRAVITY(TILE_HEIGHT*3.5, 0.233);
-  
-  accel.second = jump_gravity_short;
-}
-
-void PlayerPhysicsComponent::receive(Game&, Entity& entity, const Message& msg)
-{
-  if (msg.type == Message::Type::walkLeft)
-  {
-    velocity.first = -90;
-    direction = -1;
-  } else if (msg.type == Message::Type::walkRight)
-  {
-    velocity.first = 90;
-    direction = 1;
-  } else if (msg.type == Message::Type::stopWalking)
-  {
-    velocity.first = 0.0;
-    direction = 0;
-  } else if (msg.type == Message::Type::setHorizontalVelocity)
-  {
-    velocity.first = msg.velocity;
-  } else if (msg.type == Message::Type::setVerticalVelocity)
-  {
-    velocity.second = msg.velocity;
-  } else if (msg.type == Message::Type::hitTheGround)
-  {
-    if (isFalling)
-    {
-      playSound("res/Randomize27.wav", 0.05);
-      isFalling = false;
-    }
-    
-    velocity.second = 0.0;
-  } else if (msg.type == Message::Type::jump)
-  {
-    playSound("res/Randomize87.wav", 0.25);
-    
-    velocity.second = jump_velocity;
-    accel.second = jump_gravity;
-  } else if (msg.type == Message::Type::stopJump)
-  {
-    accel.second = jump_gravity_short;
-  } else if (msg.type == Message::Type::canDrop)
-  {
-    canDrop = true;
-  } else if (msg.type == Message::Type::cantDrop)
-  {
-    canDrop = false;
-  } else if (msg.type == Message::Type::drop)
-  {
-    if (canDrop)
-    {
-      canDrop = false;
-    } else {
-      entity.position.second = msg.dropAxis - entity.size.second;
-      velocity.second = 0;
-    }
-  } else if (msg.type == Message::Type::die)
-  {
-    frozen = true;
-  } else if (msg.type == Message::Type::stopDying)
-  {
-    frozen = false;
-  }
-}
-
-void PlayerPhysicsComponent::tick(Game& game, Entity& entity, double dt)
-{
-  // If frozen, do nothing
-  if (frozen)
-  {
-    return;
-  }
-  
-  // Continue walking even if blocked earlier
-  if (velocity.first == 0)
-  {
-    if (direction < 0)
-    {
-      velocity.first = -90;
-    } else if (direction > 0)
-    {
-      velocity.first = 90;
-    }
-  }
-  
-  // Increase gravity at the height of jump
-  if ((accel.second == jump_gravity) && (velocity.second >= 0))
-  {
-    accel.second = jump_gravity_short;
-  }
-  
-  // Do the movement
-  std::pair<double, double> old_position = entity.position;
-  PhysicsBodyComponent::tick(game, entity, dt);
-    
-  // Check for collisions
-  game.detectCollision(entity, old_position);
-  
-  // Are we moving due to gravity?
-  if (velocity.second != 0.0)
-  {
-    isFalling = true;
-  }
-}
@@ -1,25 +0,0 @@
-#ifndef PLAYER_PHYSICS_H
-#define PLAYER_PHYSICS_H
-
-#include "entity.h"
-#include "physics_body.h"
-
-class Game;
-
-class PlayerPhysicsComponent : public PhysicsBodyComponent {
-  public:
-    PlayerPhysicsComponent();
-    void tick(Game& game, Entity& entity, double dt);
-    void receive(Game& game, Entity& entity, const Message& msg);
-    
-  private:
-    double jump_velocity;
-    double jump_gravity;
-    double jump_gravity_short;
-    int direction = 0;
-    bool canDrop = false;
-    bool frozen = false;
-    bool isFalling = false;
-};
-
-#endif
@@ -1,60 +0,0 @@
-#include "player_sprite.h"
-
-PlayerSpriteComponent::PlayerSpriteComponent() : sprite("res/Starla.png")
-{
-  
-}
-
-void PlayerSpriteComponent::render(Game&, Entity& entity, Texture& buffer)
-{
-  animFrame++;
-  
-  int frame = 0;
-  if (isMoving)
-  {
-    frame += 2;
-    
-    if (animFrame % 20 < 10)
-    {
-      frame += 2;
-    }
-  }
-  
-  if (facingLeft)
-  {
-    frame++;
-  }
-  
-  double alpha = 1.0;
-  if (dying && (animFrame % 4 < 2))
-  {
-    alpha = 0.0;
-  }
-  
-  Rectangle src_rect {frame*10, 0, 10, 12};
-  Rectangle dst_rect {(int) entity.position.first, (int) entity.position.second, entity.size.first, entity.size.second};
-  buffer.blit(sprite, src_rect, dst_rect, alpha);
-}
-
-void PlayerSpriteComponent::receive(Game&, Entity&, const Message& msg)
-{
-  if (msg.type == Message::Type::walkLeft)
-  {
-    facingLeft = true;
-    isMoving = true;
-  } else if (msg.type == Message::Type::walkRight)
-  {
-    facingLeft = false;
-    isMoving = true;
-  } else if (msg.type == Message::Type::stopWalking)
-  {
-    isMoving = false;
-  } else if (msg.type == Message::Type::die)
-  {
-    dying = true;
-    isMoving = false;
-  } else if (msg.type == Message::Type::stopDying)
-  {
-    dying = false;
-  }
-}
@@ -1,23 +0,0 @@
-#ifndef PLAYER_SPRITE_H
-#define PLAYER_SPRITE_H
-
-#include "entity.h"
-#include "renderer.h"
-
-class Game;
-
-class PlayerSpriteComponent : public Component {
-  public:
-    PlayerSpriteComponent();
-    void render(Game& game, Entity& entity, Texture& buffer);
-    void receive(Game& game, Entity& entity, const Message& msg);
-    
-  private:
-    Texture sprite;
-    int animFrame = 0;
-    bool facingLeft = false;
-    bool isMoving = false;
-    bool dying = false;
-};
-
-#endif
@@ -0,0 +1,83 @@
+#ifndef TANGIBLE_H_746DB3EE
+#define TANGIBLE_H_746DB3EE
+
+#include "component.h"
+
+class PonderableComponent : public Component {
+public:
+
+  enum class Type {
+    vacuumed,
+    freefalling
+  };
+
+  PonderableComponent(Type type) : type_(type)
+  {
+  }
+
+  inline Type getType() const
+  {
+    return type_;
+  }
+
+  inline double getVelocityX() const
+  {
+    return velX_;
+  }
+
+  inline void setVelocityX(double v)
+  {
+    velX_ = v;
+  }
+
+  inline double getVelocityY() const
+  {
+    return velY_;
+  }
+
+  inline void setVelocityY(double v)
+  {
+    velY_ = v;
+  }
+
+  inline double getAccelX() const
+  {
+    return accelX_;
+  }
+
+  inline void setAccelX(double v)
+  {
+    accelX_ = v;
+  }
+
+  inline double getAccelY() const
+  {
+    return accelY_;
+  }
+
+  inline void setAccelY(double v)
+  {
+    accelY_ = v;
+  }
+
+  inline bool isGrounded() const
+  {
+    return grounded_;
+  }
+
+  inline void setGrounded(bool v)
+  {
+    grounded_ = v;
+  }
+
+private:
+
+  double velX_ = 0.0;
+  double velY_ = 0.0;
+  double accelX_ = 0.0;
+  double accelY_ = 0.0;
+  Type type_ = Type::vacuumed;
+  bool grounded_ = false;
+};
+
+#endif /* end of include guard: TANGIBLE_H_746DB3EE */
@@ -1,14 +0,0 @@
-#include "simple_collider.h"
-
-SimpleColliderComponent::SimpleColliderComponent(std::function<void (Game& game, Entity& collider)> callback) : callback(callback)
-{
-  
-}
-
-void SimpleColliderComponent::receive(Game& game, Entity&, const Message& msg)
-{
-  if (msg.type == Message::Type::collision)
-  {
-    callback(game, *msg.collisionEntity);
-  }
-}
@@ -1,18 +0,0 @@
-#ifndef SIMPLE_COLLIDER_H
-#define SIMPLE_COLLIDER_H
-
-#include "entity.h"
-#include <functional>
-
-class Game;
-
-class SimpleColliderComponent : public Component {
-  public:
-    SimpleColliderComponent(std::function<void (Game& game, Entity& collider)> callback);
-    void receive(Game& game, Entity& entity, const Message& msg);
-    
-  private:
-    std::function<void (Game& game, Entity& collider)> callback;
-};
-
-#endif
@@ -1,11 +0,0 @@
-#include "static_image.h"
-
-StaticImageComponent::StaticImageComponent(const char* filename) : sprite(Texture(filename))
-{
-  
-}
-
-void StaticImageComponent::render(Game&, Entity& entity, Texture& buffer)
-{
-  buffer.blit(sprite, sprite.entirety(), {(int) entity.position.first, (int) entity.position.second, entity.size.first, entity.size.second});
-}
@@ -1,18 +0,0 @@
-#ifndef STATIC_IMAGE_H
-#define STATIC_IMAGE_H
-
-#include "entity.h"
-#include "renderer.h"
-
-class Game;
-
-class StaticImageComponent : public Component {
-  public:
-    StaticImageComponent(const char* filename);
-    void render(Game& game, Entity& entity, Texture& buffer);
-    
-  private:
-    Texture sprite;
-};
-
-#endif
@@ -0,0 +1,69 @@
+#ifndef LOCATABLE_H_39E526CA
+#define LOCATABLE_H_39E526CA
+
+#include "component.h"
+
+class TransformableComponent : public Component {
+public:
+
+  TransformableComponent(
+    double x,
+    double y,
+    int w,
+    int h) :
+      x_(x),
+      y_(y),
+      w_(w),
+      h_(h)
+  {
+  }
+
+  inline double getX() const
+  {
+    return x_;
+  }
+
+  inline void setX(double v)
+  {
+    x_ = v;
+  }
+
+  inline double getY() const
+  {
+    return y_;
+  }
+
+  inline void setY(double v)
+  {
+    y_ = v;
+  }
+
+  inline int getW() const
+  {
+    return w_;
+  }
+
+  inline void setW(int v)
+  {
+    w_ = v;
+  }
+
+  inline int getH() const
+  {
+    return h_;
+  }
+
+  inline void setH(int v)
+  {
+    h_ = v;
+  }
+
+private:
+
+  double x_;
+  double y_;
+  int w_;
+  int h_;
+};
+
+#endif /* end of include guard: LOCATABLE_H_39E526CA */
@@ -1,100 +0,0 @@
-#include "user_movement.h"
-#include "renderer.h"
-
-void UserMovementComponent::input(Game& game, Entity& entity, int key, int action)
-{
-  if (action == GLFW_PRESS)
-  {
-    if (key == GLFW_KEY_LEFT)
-    {
-      holdingLeft = true;
-      
-      if (!frozen)
-      {
-        entity.send(game, Message::Type::walkLeft);
-      }
-    } else if (key == GLFW_KEY_RIGHT)
-    {
-      holdingRight = true;
-      
-      if (!frozen)
-      {
-        entity.send(game, Message::Type::walkRight);
-      }
-    } else if (key == GLFW_KEY_UP)
-    {
-      if (!frozen)
-      {
-        entity.send(game, Message::Type::jump);
-      }
-    } else if (key == GLFW_KEY_DOWN)
-    {
-      if (!frozen)
-      {
-        entity.send(game, Message::Type::canDrop);
-      }
-    }
-  } else if (action == GLFW_RELEASE)
-  {
-    if (key == GLFW_KEY_LEFT)
-    {
-      holdingLeft = false;
-      
-      if (!frozen)
-      {
-        if (holdingRight)
-        {
-          entity.send(game, Message::Type::walkRight);
-        } else {
-          entity.send(game, Message::Type::stopWalking);
-        }
-      }
-    } else if (key == GLFW_KEY_RIGHT)
-    {
-      holdingRight = false;
-      
-      if (!frozen)
-      {
-        if (holdingLeft)
-        {
-          entity.send(game, Message::Type::walkLeft);
-        } else {
-          entity.send(game, Message::Type::stopWalking);
-        }
-      }
-    } else if (key == GLFW_KEY_DOWN)
-    {
-      if (!frozen)
-      {
-        entity.send(game, Message::Type::cantDrop);
-      }
-    } else if (key == GLFW_KEY_UP)
-    {
-      if (!frozen)
-      {
-        entity.send(game, Message::Type::stopJump);
-      }
-    }
-  }
-}
-
-void UserMovementComponent::receive(Game& game, Entity& entity, const Message& msg)
-{
-  if (msg.type == Message::Type::die)
-  {
-    frozen = true;
-    
-    entity.send(game, Message::Type::stopWalking);
-  } else if (msg.type == Message::Type::stopDying)
-  {
-    frozen = false;
-    
-    if (holdingLeft)
-    {
-      entity.send(game, Message::Type::walkLeft);
-    } else if (holdingRight)
-    {
-      entity.send(game, Message::Type::walkRight);
-    }
-  }
-}
@@ -1,19 +0,0 @@
-#ifndef USER_MOVEMENT_H
-#define USER_MOVEMENT_H
-
-#include "entity.h"
-
-class Game;
-
-class UserMovementComponent : public Component {
-  public:
-    void input(Game& game, Entity& entity, int key, int action);
-    void receive(Game&, Entity&, const Message& msg);
-      
-  private:
-    bool holdingLeft = false;
-    bool holdingRight = false;
-    bool frozen = false;
-};
-
-#endif
@@ -7,8 +7,20 @@ const int GAME_WIDTH = 320;
 const int GAME_HEIGHT = 200;
 const int MAP_WIDTH = GAME_WIDTH/TILE_WIDTH;
 const int MAP_HEIGHT = GAME_HEIGHT/TILE_HEIGHT - 1;
+const int WALL_GAP = 6;
+const int TILESET_COLS = 8;
+const int FONT_COLS = 16;
 
 const int FRAMES_PER_SECOND = 60;
 const double SECONDS_PER_FRAME = 1.0 / FRAMES_PER_SECOND;
 
+#define CALC_VELOCITY(h, l) (-2 * (h) / (l))
+#define CALC_GRAVITY(h, l) (2 * ((h) / (l)) / (l))
+
+const double NORMAL_GRAVITY = CALC_GRAVITY(TILE_HEIGHT*3.5, 0.233);
+const double JUMP_GRAVITY = CALC_GRAVITY(TILE_HEIGHT*4.5, 0.3);
+const double JUMP_VELOCITY = CALC_VELOCITY(TILE_HEIGHT*4.5, 0.3);
+
+const double WALK_SPEED = 90;
+
 #endif
@@ -0,0 +1,11 @@
+#ifndef DIRECTION_H_9C49EAFD
+#define DIRECTION_H_9C49EAFD
+
+enum class Direction {
+  left,
+  right,
+  up,
+  down
+};
+
+#endif /* end of include guard: DIRECTION_H_9C49EAFD */
@@ -1,46 +0,0 @@
-#include "entity.h"
-
-void Entity::addComponent(std::shared_ptr<Component> c)
-{
-  components.push_back(c);
-}
-
-void Entity::send(Game& game, const Message& msg)
-{
-  for (auto component : components)
-  {
-    component->receive(game, *this, msg);
-  }
-}
-
-void Entity::tick(Game& game, double dt)
-{
-  for (auto component : components)
-  {
-    component->tick(game, *this, dt);
-  }
-}
-
-void Entity::input(Game& game, int key, int action)
-{
-  for (auto component : components)
-  {
-    component->input(game, *this, key, action);
-  }
-}
-
-void Entity::render(Game& game, Texture& buffer)
-{
-  for (auto component : components)
-  {
-    component->render(game, *this, buffer);
-  }
-}
-
-void Entity::detectCollision(Game& game, Entity& collider, std::pair<double, double> old_position)
-{
-  for (auto component : components)
-  {
-    component->detectCollision(game, *this, collider, old_position);
-  }
-}
@@ -1,64 +0,0 @@
-#ifndef ENTITY_H
-#define ENTITY_H
-
-#include <list>
-#include "renderer.h"
-
-class Game;
-class Map;
-class Entity;
-class Component;
-
-class Message {
-  public:
-    enum class Type {
-      walkLeft,
-      walkRight,
-      stopWalking,
-      setHorizontalVelocity,
-      setVerticalVelocity,
-      collision,
-      jump,
-      stopJump,
-      drop,
-      canDrop,
-      cantDrop,
-      die,
-      stopDying,
-      hitTheGround
-    };
-    
-    Message(Type type) : type(type) {}
-    
-    Type type;
-    Entity* collisionEntity;
-    int dropAxis;
-    double velocity;
-};
-
-class Entity {
-  public:
-    void addComponent(std::shared_ptr<Component> c);
-    void send(Game& game, const Message& msg);
-    void tick(Game& game, double dt);
-    void input(Game& game, int key, int action);
-    void render(Game& game, Texture& buffer);
-    void detectCollision(Game& game, Entity& collider, std::pair<double, double> old_position);
-    
-    std::pair<double, double> position;
-    std::pair<int, int> size;
-    
-  private:
-    std::list<std::shared_ptr<Component>> components;
-};
-
-class Component {
-  public:
-    virtual void receive(Game&, Entity&, const Message&) {}
-    virtual void render(Game&, Entity&, Texture&) {}
-    virtual void tick(Game&, Entity&, double) {}
-    virtual void input(Game&, Entity&, int, int) {}
-    virtual void detectCollision(Game&, Entity&, Entity&, std::pair<double, double>) {}
-};
-
-#endif
@@ -0,0 +1,39 @@
+#ifndef ENTITY_MANAGER_CPP_42D78C22
+#define ENTITY_MANAGER_CPP_42D78C22
+
+#include "entity_manager.h"
+
+template <>
+std::set<EntityManager::id_type> EntityManager::getEntitiesWithComponents<>(
+  std::set<std::type_index>& componentTypes)
+{
+  if (cachedComponents.count(componentTypes) == 1)
+  {
+    return cachedComponents[componentTypes];
+  }
+
+  std::set<id_type>& cache = cachedComponents[componentTypes];
+  for (id_type entity = 0; entity < entities.size(); entity++)
+  {
+    EntityData& data = entities[entity];
+    bool cacheEntity = true;
+
+    for (auto& componentType : componentTypes)
+    {
+      if (data.components.count(componentType) == 0)
+      {
+        cacheEntity = false;
+        break;
+      }
+    }
+
+    if (cacheEntity)
+    {
+      cache.insert(entity);
+    }
+  }
+
+  return cache;
+}
+
+#endif /* end of include guard: ENTITY_MANAGER_CPP_42D78C22 */
@@ -0,0 +1,211 @@
+#ifndef ENTITY_MANAGER_H_C5832F11
+#define ENTITY_MANAGER_H_C5832F11
+
+#include <map>
+#include <vector>
+#include <typeindex>
+#include <set>
+#include <stdexcept>
+#include "component.h"
+#include "algorithms.h"
+
+class EntityManager {
+private:
+
+  struct EntityData {
+    std::map<std::type_index, std::unique_ptr<Component>> components;
+  };
+
+  using database_type = std::vector<EntityData>;
+
+public:
+
+  using id_type = database_type::size_type;
+
+private:
+
+  database_type entities;
+  std::vector<bool> slotAvailable;
+  std::map<std::set<std::type_index>, std::set<id_type>> cachedComponents;
+
+  id_type nextEntityID = 0;
+
+  template <class T, class... R>
+  std::set<id_type> getEntitiesWithComponentsHelper(
+    std::set<std::type_index>& componentTypes)
+  {
+    componentTypes.insert(typeid(T));
+
+    return getEntitiesWithComponents<R...>(componentTypes);
+  }
+
+  template <class... R>
+  std::set<id_type> getEntitiesWithComponents(
+    std::set<std::type_index>& componentTypes)
+  {
+    return getEntitiesWithComponentsHelper<R...>(componentTypes);
+  }
+
+public:
+
+  EntityManager() = default;
+
+  EntityManager(const EntityManager& copy) = delete;
+
+  id_type emplaceEntity()
+  {
+    if (nextEntityID >= entities.size())
+    {
+      // If the database is saturated, add a new element for the new entity.
+      entities.emplace_back();
+      slotAvailable.push_back(false);
+
+      return nextEntityID++;
+    } else {
+      // If there is an available slot in the database, use it.
+      id_type id = nextEntityID++;
+      slotAvailable[id] = false;
+
+      // Fast forward the next available slot pointer to an available slot.
+      while ((nextEntityID < entities.size()) && !slotAvailable[nextEntityID])
+      {
+        nextEntityID++;
+      }
+
+      return id;
+    }
+  }
+
+  void deleteEntity(id_type entity)
+  {
+    if ((entity >= entities.size()) || slotAvailable[entity])
+    {
+      throw std::invalid_argument("Cannot delete non-existent entity");
+    }
+
+    // Uncache components
+    for (auto& cache : cachedComponents)
+    {
+      cache.second.erase(entity);
+    }
+
+    // Destroy the data
+    entities[entity].components.clear();
+
+    // Mark the slot as available
+    slotAvailable[entity] = true;
+
+    if (entity < nextEntityID)
+    {
+      nextEntityID = entity;
+    }
+  }
+
+  template <class T, class... Args>
+  T& emplaceComponent(id_type entity, Args&&... args)
+  {
+    if ((entity >= entities.size()) || slotAvailable[entity])
+    {
+      throw std::invalid_argument("Cannot get non-existent entity");
+    }
+
+    EntityData& data = entities[entity];
+    std::type_index componentType = typeid(T);
+
+    if (data.components.count(componentType))
+    {
+      throw std::invalid_argument("Cannot emplace already-existent component");
+    }
+
+    // Initialize the component
+    std::unique_ptr<T> ptr(new T(std::forward<Args>(args)...));
+    T& component = *ptr;
+    data.components[componentType] = std::move(ptr);
+
+    // Invalidate related caches
+    erase_if(
+      cachedComponents,
+      [&componentType] (
+        std::pair<const std::set<std::type_index>, std::set<id_type>>& cache) {
+          return cache.first.count(componentType) == 1;
+        });
+
+    return component;
+  }
+
+  template <class T>
+  void removeComponent(id_type entity)
+  {
+    if ((entity >= entities.size()) || slotAvailable[entity])
+    {
+      throw std::invalid_argument("Cannot get non-existent entity");
+    }
+
+    EntityData& data = entities[entity];
+    std::type_index componentType = typeid(T);
+
+    if (!data.components.count(componentType))
+    {
+      throw std::invalid_argument("Cannot delete non-existent component");
+    }
+
+    // Destroy the component
+    data.components.erase(componentType);
+
+    // Uncache the component
+    for (auto& cache : cachedComponents)
+    {
+      if (cache.first.count(componentType) == 1)
+      {
+        cache.second.erase(entity);
+      }
+    }
+  }
+
+  template <class T>
+  T& getComponent(id_type entity)
+  {
+    if ((entity >= entities.size()) || slotAvailable[entity])
+    {
+      throw std::invalid_argument("Cannot get non-existent entity");
+    }
+
+    EntityData& data = entities[entity];
+    std::type_index componentType = typeid(T);
+
+    if (!data.components.count(componentType))
+    {
+      throw std::invalid_argument("Cannot get non-existent component");
+    }
+
+    return *dynamic_cast<T*>(data.components[componentType].get());
+  }
+
+  template <class T>
+  bool hasComponent(id_type entity)
+  {
+    if ((entity >= entities.size()) || slotAvailable[entity])
+    {
+      throw std::invalid_argument("Cannot get non-existent entity");
+    }
+
+    EntityData& data = entities[entity];
+    std::type_index componentType = typeid(T);
+
+    return data.components.count(componentType);
+  }
+
+  template <class... R>
+  std::set<id_type> getEntitiesWithComponents()
+  {
+    std::set<std::type_index> componentTypes;
+
+    return getEntitiesWithComponentsHelper<R...>(componentTypes);
+  }
+};
+
+template <>
+std::set<EntityManager::id_type> EntityManager::getEntitiesWithComponents<>(
+  std::set<std::type_index>& componentTypes);
+
+#endif /* end of include guard: ENTITY_MANAGER_H_C5832F11 */
@@ -1,182 +0,0 @@
-#include "entityfactory.h"
-#include <libxml/parser.h>
-#include "muxer.h"
-#include <cstdio>
-#include <map>
-#include <list>
-#include "components/static_image.h"
-#include "components/simple_collider.h"
-#include "components/physics_body.h"
-#include "components/ai.h"
-#include "game.h"
-
-void parseEntityAIData(AI& ai, xmlNodePtr node, const std::map<std::string, int>& items)
-{
-  xmlChar* key;
-  
-  for (xmlNodePtr aiNode = node->xmlChildrenNode; aiNode != NULL; aiNode = aiNode->next)
-  {
-    if (!xmlStrcmp(aiNode->name, (xmlChar*) "move"))
-    {
-      MoveAIAction::Direction dir;
-      int len;
-      int speed;
-      
-      key = xmlGetProp(aiNode, (xmlChar*) "direction");
-      if (key == 0) exit(2);
-      if (!xmlStrcmp(key, (xmlChar*) "left"))
-      {
-        dir = MoveAIAction::Direction::Left;
-      } else if (!xmlStrcmp(key, (xmlChar*) "right"))
-      {
-        dir = MoveAIAction::Direction::Right;
-      } else if (!xmlStrcmp(key, (xmlChar*) "up"))
-      {
-        dir = MoveAIAction::Direction::Up;
-      } else if (!xmlStrcmp(key, (xmlChar*) "down"))
-      {
-        dir = MoveAIAction::Direction::Down;
-      } else {
-        exit(2);
-      }
-      xmlFree(key);
-      
-      key = xmlGetProp(aiNode, (xmlChar*) "length");
-      if (key != 0)
-      {
-        len = atoi((char*) key);
-      } else {
-        key = xmlGetProp(aiNode, (xmlChar*) "length-var");
-        if (key == 0) exit(2);
-        std::string varName = (char*) key;
-        len = items.at(varName);
-      }
-      xmlFree(key);
-      
-      key = xmlGetProp(aiNode, (xmlChar*) "speed");
-      if (key != 0)
-      {
-        speed = atoi((char*) key);
-      } else {
-        key = xmlGetProp(aiNode, (xmlChar*) "speed-var");
-        if (key == 0) exit(2);
-        std::string varName = (char*) key;
-        speed = items.at(varName);
-      }
-      xmlFree(key);
-      
-      ai.addAction(std::make_shared<MoveAIAction>(dir, len, speed));
-    } else if (!xmlStrcmp(aiNode->name, (xmlChar*) "switch"))
-    {
-      key = xmlGetProp(aiNode, (xmlChar*) "item");
-      if (key == 0) exit(2);
-      std::string switchItem = (char*) key;
-      xmlFree(key);
-      
-      for (xmlNodePtr switchNode = aiNode->xmlChildrenNode; switchNode != NULL; switchNode = switchNode->next)
-      {
-        if (!xmlStrcmp(switchNode->name, (xmlChar*) "case"))
-        {
-          key = xmlGetProp(switchNode, (xmlChar*) "value");
-          if (key == 0) exit(2);
-          int caseValue = atoi((char*) key);
-          xmlFree(key);
-          
-          if (items.at(switchItem) == caseValue)
-          {
-            parseEntityAIData(ai, switchNode, items);
-          }
-        }
-      }
-    }
-  }
-}
-
-std::shared_ptr<Entity> EntityFactory::createNamedEntity(const std::string name, const std::map<std::string, int>& items)
-{
-  xmlDocPtr doc = xmlParseFile("res/entities.xml");
-  if (doc == nullptr)
-  {
-    fprintf(stderr, "Error reading entities\n");
-    exit(-1);
-  }
-
-  xmlNodePtr top = xmlDocGetRootElement(doc);
-  if (top == nullptr)
-  {
-    fprintf(stderr, "Empty entities file\n");
-    exit(-1);
-  }
-
-  if (xmlStrcmp(top->name, (const xmlChar*) "entities"))
-  {
-    fprintf(stderr, "Invalid entities definition\n");
-    exit(-1);
-  }
-  
-  auto entity = std::make_shared<Entity>();
-
-  xmlChar* key;
-  for (xmlNodePtr node = top->xmlChildrenNode; node != NULL; node = node->next)
-  {
-    if (!xmlStrcmp(node->name, (xmlChar*) "entity"))
-    {
-      key = xmlGetProp(node, (xmlChar*) "id");
-      if (key == 0) exit(-1);
-      std::string entityID = (char*) key;
-      xmlFree(key);
-      
-      if (entityID == name)
-      {
-        key = xmlGetProp(node, (xmlChar*) "sprite");
-        if (key == 0) exit(-1);
-        auto spriteComponent = std::make_shared<StaticImageComponent>((char*) key);
-        entity->addComponent(spriteComponent);
-        xmlFree(key);
-        
-        auto physicsComponent = std::make_shared<PhysicsBodyComponent>();
-        entity->addComponent(physicsComponent);
-      
-        key = xmlGetProp(node, (xmlChar*) "width");
-        if (key == 0) exit(-1);
-        entity->size.first = atoi((char*) key);
-        xmlFree(key);
-      
-        key = xmlGetProp(node, (xmlChar*) "height");
-        if (key == 0) exit(-1);
-        entity->size.second = atoi((char*) key);
-        xmlFree(key);
-        
-        bool addAI = false;
-        auto aiComponent = std::make_shared<AIComponent>();
-        
-        for (xmlNodePtr entityNode = node->xmlChildrenNode; entityNode != NULL; entityNode = entityNode->next)
-        {
-          if (!xmlStrcmp(entityNode->name, (xmlChar*) "ai"))
-          {
-            addAI = true;
-            
-            xmlChar* chanceKey = xmlGetProp(entityNode, (xmlChar*) "chance");
-            if (chanceKey == 0) exit(2);
-            int chance = atoi((char*) chanceKey);
-            xmlFree(chanceKey);
-            
-            AI& ai = aiComponent->emplaceAI(chance);
-            parseEntityAIData(ai, entityNode, items);
-          }
-        }
-        
-        if (addAI)
-        {
-          entity->addComponent(aiComponent);
-        }
-        
-        break;
-      }
-    }
-  }
-
-  xmlFreeDoc(doc);
-  
-  return entity;
-}
@@ -1,15 +0,0 @@
-#ifndef ENTITYFACTORY_H
-#define ENTITYFACTORY_H
-
-#include <string>
-#include <map>
-
-class Entity;
-class Map;
-
-class EntityFactory {
-  public:
-    static std::shared_ptr<Entity> createNamedEntity(const std::string name, const std::map<std::string, int>& items);
-};
-
-#endif
@@ -1,178 +1,100 @@
 #include "game.h"
-#include <cstdlib>
+#include "components/animatable.h"
+#include "components/transformable.h"
+#include "components/controllable.h"
+#include "components/ponderable.h"
+#include "components/orientable.h"
+#include "systems/controlling.h"
+#include "systems/pondering.h"
+#include "systems/animating.h"
+#include "systems/mapping.h"
+#include "systems/orienting.h"
+#include "animation.h"
 #include "renderer.h"
-#include "muxer.h"
-#include "map.h"
-#include "components/user_movement.h"
-#include "components/player_physics.h"
-#include "components/player_sprite.h"
-#include "components/map_render.h"
-#include "components/map_collision.h"
 #include "consts.h"
 
-Game::Game(const char* mapfile) : world(mapfile)
-{ 
-  // Set up entities
-  player = std::make_shared<Entity>();
-  player->position = world.getStartingPosition();
-  player->size = std::make_pair(10.0,12.0);
-  
-  auto player_input = std::make_shared<UserMovementComponent>();
-  player->addComponent(player_input);
-  
-  auto player_physics = std::make_shared<PlayerPhysicsComponent>();
-  player->addComponent(player_physics);
-  
-  auto player_anim = std::make_shared<PlayerSpriteComponent>();
-  player->addComponent(player_anim);
-  
-  const Map& startingMap = world.getStartingMap();
-  save = {&startingMap, player->position};
-  
-  loadMap(startingMap, player->position);
-}
-
 void key_callback(GLFWwindow* window, int key, int, int action, int)
 {
-  Game* game = (Game*) glfwGetWindowUserPointer(window);
-  
-  if ((key == GLFW_KEY_ESCAPE) && (action == GLFW_PRESS))
-  {
-    game->shouldQuit = true;
-  }
-  
-  for (auto entity : game->entities)
+  Game& game = *((Game*) glfwGetWindowUserPointer(window));
+
+  if ((action == GLFW_PRESS) && (key == GLFW_KEY_ESCAPE))
   {
-    entity->input(*game, key, action);
+    game.shouldQuit_ = true;
+
+    return;
   }
+
+  game.systemManager_.input(key, action);
 }
 
-void Game::execute(GLFWwindow* window)
+Game::Game(
+  GLFWwindow* window) :
+    window_(window),
+    world_("res/maps.xml")
 {
+  systemManager_.emplaceSystem<ControllingSystem>(*this);
+  systemManager_.emplaceSystem<OrientingSystem>(*this);
+  systemManager_.emplaceSystem<PonderingSystem>(*this);
+  systemManager_.emplaceSystem<MappingSystem>(*this);
+  systemManager_.emplaceSystem<AnimatingSystem>(*this);
+
+  int player = entityManager_.emplaceEntity();
+
+  AnimationSet playerGraphics {"res/Starla2.bmp", 10, 12, 6};
+  playerGraphics.emplaceAnimation("stillLeft", 3, 1, 1);
+  playerGraphics.emplaceAnimation("stillRight", 0, 1, 1);
+  playerGraphics.emplaceAnimation("walkingLeft", 4, 2, 10);
+  playerGraphics.emplaceAnimation("walkingRight", 1, 2, 10);
+
+  entityManager_.emplaceComponent<AnimatableComponent>(
+    player,
+    std::move(playerGraphics),
+    "stillLeft");
+
+  entityManager_.emplaceComponent<TransformableComponent>(
+    player,
+    203, 44, 10, 12);
+
+  systemManager_.getSystem<PonderingSystem>().initializeBody(
+    player,
+    PonderableComponent::Type::freefalling);
+
+  entityManager_.emplaceComponent<ControllableComponent>(player);
+  entityManager_.emplaceComponent<OrientableComponent>(player);
+
+  systemManager_.getSystem<MappingSystem>().loadMap(world_.getStartingMapId());
+
   glfwSwapInterval(1);
-  glfwSetWindowUserPointer(window, this);
-  glfwSetKeyCallback(window, key_callback);
-  
-  Texture buffer(GAME_WIDTH, GAME_HEIGHT);
+  glfwSetWindowUserPointer(window_, this);
+  glfwSetKeyCallback(window_, key_callback);
+}
 
+void Game::execute()
+{
   double lastTime = glfwGetTime();
   const double dt = 0.01;
   double accumulator = 0.0;
-  
-  while (!(shouldQuit || glfwWindowShouldClose(window)))
+  Texture texture(GAME_WIDTH, GAME_HEIGHT);
+
+  while (!(shouldQuit_ || glfwWindowShouldClose(window_)))
   {
     double currentTime = glfwGetTime();
     double frameTime = currentTime - lastTime;
     lastTime = currentTime;
-    
-    // Should we load a new world?
-    if (newWorld)
-    {
-      newWorld = false;
-      entities.clear();
-      entities = std::move(nextEntities);
-      
-      player->position = nextPosition;
-    }
-    
-    // Handle input
+
     glfwPollEvents();
-    
-    // Tick!
+
     accumulator += frameTime;
     while (accumulator >= dt)
     {
-      for (auto entity : entities)
-      {
-        entity->tick(*this, dt);
-      }
-      
+      systemManager_.tick(dt);
+
       accumulator -= dt;
     }
-    
-    // Do any scheduled tasks
-    for (auto& task : scheduled)
-    {
-      task.first -= frameTime;
-      
-      if (task.first <= 0)
-      {
-        task.second();
-      }
-    }
-    
-    scheduled.remove_if([] (std::pair<double, std::function<void ()>> value) { return value.first <= 0; });
-  
-    // Do rendering
-    buffer.fill(buffer.entirety(), 0, 0, 0);
-    for (auto entity : entities)
-    {
-      entity->render(*this, buffer);
-    }
-
-    buffer.renderScreen();
-  }
-}
-
-void Game::loadMap(const Map& map, std::pair<double, double> position)
-{
-  auto mapEn = std::make_shared<Entity>();
-  
-  auto map_render = std::make_shared<MapRenderComponent>(map);
-  mapEn->addComponent(map_render);
-  
-  auto map_collision = std::make_shared<MapCollisionComponent>(map);
-  mapEn->addComponent(map_collision);
-  
-  // Map in the back, player on top, rest of entities in between
-  nextEntities.clear();
-  nextEntities.push_back(mapEn);
-  map.createEntities(nextEntities);
-  nextEntities.push_back(player);
-  
-  newWorld = true;
-  
-  currentMap = &map;
-  nextPosition = position;
-}
 
-void Game::detectCollision(Entity& collider, std::pair<double, double> old_position)
-{
-  for (auto entity : entities)
-  {
-    entity->detectCollision(*this, collider, old_position);
+    // Render
+    texture.fill(texture.entirety(), 0, 0, 0);
+    systemManager_.render(texture);
+    texture.renderScreen();
   }
 }
-
-void Game::saveGame()
-{
-  save = {currentMap, player->position};
-}
-
-void Game::schedule(double time, std::function<void ()> callback)
-{
-  scheduled.emplace_front(time, std::move(callback));
-}
-
-void Game::playerDie()
-{
-  player->send(*this, Message::Type::die);
-  
-  playSound("res/Hit_Hurt5.wav", 0.25);
-  
-  schedule(0.75, [&] () {
-    if (*currentMap != *save.map)
-    {
-      loadMap(*save.map, save.position);
-    } else {
-      player->position = save.position;
-    }
-    
-    player->send(*this, Message::Type::stopDying);
-  });
-}
-
-const World& Game::getWorld() const
-{
-  return world;
-}
@@ -1,45 +1,47 @@
-#ifndef GAME_H
-#define GAME_H
-
-#include <memory>
-#include <functional>
-#include <list>
-#include <map>
-#include "map.h"
+#ifndef GAME_H_1014DDC9
+#define GAME_H_1014DDC9
+
+#include "renderer.h"
+#include "entity_manager.h"
+#include "system_manager.h"
 #include "world.h"
 
-class Entity;
-struct GLFWwindow;
+class Game {
+public:
 
-struct Savefile {
-  const Map* map;
-  std::pair<double, double> position;
-};
+  Game(GLFWwindow* window);
 
-class Game {
-  public:
-    Game(const char* maps);
-    void execute(GLFWwindow* window);
-    void loadMap(const Map& map, std::pair<double, double> position);
-    void detectCollision(Entity& collider, std::pair<double, double> old_position);
-    void saveGame();
-    void schedule(double time, std::function<void ()> callback);
-    void playerDie();
-    const World& getWorld() const;
-    
-  private:
-    friend void key_callback(GLFWwindow* window, int key, int scancode, int action, int mods);
-
-    std::list<std::shared_ptr<Entity>> entities;
-    std::list<std::shared_ptr<Entity>> nextEntities;
-    std::pair<double, double> nextPosition;
-    bool newWorld;
-    std::shared_ptr<Entity> player;
-    const Map* currentMap;
-    Savefile save;
-    std::list<std::pair<double, std::function<void ()>>> scheduled;
-    bool shouldQuit = false;
-    World world;
+  void execute();
+
+  inline EntityManager& getEntityManager()
+  {
+    return entityManager_;
+  }
+
+  inline SystemManager& getSystemManager()
+  {
+    return systemManager_;
+  }
+
+  inline const World& getWorld()
+  {
+    return world_;
+  }
+
+  friend void key_callback(
+    GLFWwindow* window,
+    int key,
+    int scancode,
+    int action,
+    int mods);
+
+private:
+
+  GLFWwindow* const window_;
+  EntityManager entityManager_;
+  SystemManager systemManager_;
+  World world_;
+  bool shouldQuit_ = false;
 };
 
-#endif
+#endif /* end of include guard: GAME_H_1014DDC9 */
@@ -1,25 +1,27 @@
 #include <ctime>
 #include <list>
-#include "renderer.h"
 #include <cstdlib>
-#include "game.h"
+#include "renderer.h"
 #include "muxer.h"
+#include "game.h"
 
 int main()
 {
   srand(time(NULL));
-  
+
   GLFWwindow* window = initRenderer();
+  glfwSwapInterval(1);
+
   initMuxer();
-  
+
   // Put this in a block so game goes out of scope before we destroy the renderer
   {
-    Game game {"res/maps.xml"};
-    game.execute(window);
+    Game game {window};
+    game.execute();
   }
-  
+
   destroyMuxer();
   destroyRenderer();
-  
+
   return 0;
 }
@@ -1,151 +0,0 @@
-#include "map.h"
-#include <cstdlib>
-#include <cstring>
-#include <map>
-#include "entityfactory.h"
-#include "entity.h"
-#include "game.h"
-#include "consts.h"
-
-Map::Map(int id)
-{
-  this->id = id;
-  mapdata = (int*) calloc(1, sizeof(int));
-}
-
-Map::Map(const Map& map)
-{
-  mapdata = (int*) malloc(MAP_WIDTH*MAP_HEIGHT*sizeof(int));
-  memcpy(mapdata, map.mapdata, MAP_WIDTH*MAP_HEIGHT*sizeof(int));
-  
-  id = map.id;
-  title = map.title;
-  adjacents = map.adjacents;
-  entities = map.entities;
-}
-
-Map::Map(Map&& map) : Map()
-{
-  swap(*this, map);
-}
-
-Map::~Map()
-{
-  free(mapdata);
-}
-
-Map& Map::operator= (Map map)
-{
-  swap(*this, map);
-  
-  return *this;
-}
-
-void swap(Map& first, Map& second)
-{
-  std::swap(first.mapdata, second.mapdata);
-  std::swap(first.title, second.title);
-  std::swap(first.adjacents, second.adjacents);
-  std::swap(first.id, second.id);
-  std::swap(first.entities, second.entities);
-}
-
-int Map::getID() const
-{
-  return id;
-}
-
-const int* Map::getMapdata() const
-{
-  return mapdata;
-}
-
-std::string Map::getTitle() const
-{
-  return title;
-}
-
-void Map::createEntities(std::list<std::shared_ptr<Entity>>& entities) const
-{
-  for (auto data : this->entities)
-  {
-    auto entity = EntityFactory::createNamedEntity(data.name, data.items);
-    entity->position = data.position;
-    
-    entities.push_back(entity);
-  }
-}
-
-bool Map::operator==(const Map& other) const
-{
-  return id == other.id;
-}
-
-bool Map::operator!=(const Map& other) const
-{
-  return id != other.id;
-}
-
-Map::MoveType Map::moveTypeForShort(std::string str)
-{
-  if (str == "wrap") return MoveType::Wrap;
-  if (str == "warp") return MoveType::Warp;
-  if (str == "reverseWarp") return MoveType::ReverseWarp;
-  
-  return MoveType::Wall;
-}
-
-Map::MoveDir Map::moveDirForShort(std::string str)
-{
-  if (str == "right") return MoveDir::Right;
-  if (str == "up") return MoveDir::Up;
-  if (str == "down") return MoveDir::Down;
-  
-  return MoveDir::Left;
-}
-
-static const Map::Adjacent defaultAdjacent {};
-const Map::Adjacent& Map::getAdjacent(MoveDir dir) const
-{
-  if (adjacents.count(dir) > 0)
-  {
-    return adjacents.at(dir);
-  } else {
-    return defaultAdjacent;
-  }
-}
-
-bool Map::moveTypeTakesMap(MoveType type)
-{
-  switch (type)
-  {
-    case MoveType::Wall: return false;
-    case MoveType::Wrap: return false;
-    case MoveType::Warp: return true;
-    case MoveType::ReverseWarp: return true;
-  }
-}
-
-void Map::setMapdata(int* mapdata)
-{
-  free(this->mapdata);
-  this->mapdata = mapdata;
-}
-
-void Map::setTitle(std::string title)
-{
-  this->title = title;
-}
-
-void Map::setAdjacent(MoveDir dir, MoveType type, int map)
-{
-  Adjacent& cur = adjacents[dir];
-  cur.type = type;
-  if (map != -1) cur.map = map;
-}
-
-void Map::addEntity(EntityData& data)
-{
-  entities.push_back(data);
-}
-
@@ -1,70 +1,45 @@
-#ifndef MAP_H
-#define MAP_H
+#ifndef MAP_H_74055FC0
+#define MAP_H_74055FC0
 
+#include <vector>
 #include <string>
 #include <list>
+#include <stdexcept>
 #include <map>
 
-class Entity;
-
 class Map {
-  public:
-    Map(int id);
-    Map() : Map(-1) {}
-    Map(const Map& map);
-    Map(Map&& map);
-    ~Map();
-    Map& operator= (Map other);
-    friend void swap(Map& first, Map& second);
-    
-    enum class MoveType {
-      Wall,
-      Wrap,
-      Warp,
-      ReverseWarp
-    };
-    
-    enum class MoveDir {
-      Left,
-      Right,
-      Up,
-      Down
-    };
-    
-    struct EntityData {
-      std::string name;
-      std::pair<int, int> position;
-      std::map<std::string, int> items;
-    };
-    
-    struct Adjacent {
-      MoveType type = MoveType::Wall;
-      int map = -1;
-    };
-    
-    static MoveType moveTypeForShort(std::string str);
-    static MoveDir moveDirForShort(std::string str);
-    static bool moveTypeTakesMap(MoveType type);
-    
-    int getID() const;
-    const int* getMapdata() const;
-    std::string getTitle() const;
-    const Adjacent& getAdjacent(MoveDir dir) const;
-    
-    void createEntities(std::list<std::shared_ptr<Entity>>& entities) const;
-    bool operator==(const Map& other) const;
-    bool operator!=(const Map& other) const;
-    
-    void setMapdata(int* mapdata);
-    void setTitle(std::string title);
-    void setAdjacent(MoveDir dir, MoveType type, int map);
-    void addEntity(EntityData& data);
-  private:
-    int* mapdata;
-    std::string title;
-    int id;
-    std::list<EntityData> entities;
-    std::map<MoveDir, Adjacent> adjacents;
+public:
+
+  Map(
+    int id,
+    std::vector<int> tiles,
+    std::string title) :
+      id_(id),
+      tiles_(std::move(tiles)),
+      title_(std::move(title))
+  {
+  }
+
+  inline size_t getId() const
+  {
+    return id_;
+  }
+
+  inline const std::vector<int>& getTiles() const
+  {
+    return tiles_;
+  }
+
+  inline const std::string& getTitle() const
+  {
+    return title_;
+  }
+
+private:
+
+  int id_;
+  std::vector<int> tiles_;
+  std::string title_;
 };
 
-#endif
+#endif /* end of include guard: MAP_H_74055FC0 */
@@ -4,6 +4,9 @@
 #include <portaudio.h>
 #include <list>
 #include <cmath>
+#include <vector>
+#include <stdexcept>
+#include <sstream>
 
 #define SAMPLE_RATE (44100)
 #define DELAY_IN_SECS (0.075)
@@ -17,11 +20,14 @@ const int delaySize = SAMPLE_RATE * DELAY_IN_SECS;
 class Sound {
   public:
     Sound(const char* filename, float vol);
-    ~Sound();
-    
-    float* ptr;
+
+    inline bool isDone() const
+    {
+      return pos >= data.size();
+    }
+
+    std::vector<float> data;
     unsigned long pos;
-    unsigned long len;
     float vol;
 };
 
@@ -45,29 +51,29 @@ int paMuxerCallback(const void*, void* outputBuffer, unsigned long framesPerBuff
 {
   Muxer* muxer = (Muxer*) userData;
   float* out = (float*) outputBuffer;
-  
+
   for (unsigned long i = 0; i<framesPerBuffer; i++)
   {
     float in = 0.0;
-    
+
     for (auto& sound : muxer->playing)
     {
-      if (sound.pos < sound.len)
+      if (sound.pos < sound.data.size())
       {
-        in += sound.ptr[sound.pos++] * sound.vol;
+        in += sound.data[sound.pos++] * sound.vol;
       }
     }
-    
+
     if (in >  1) in = 1;
     if (in < -1) in = -1;
-    
+
     float sample = muxer->delay[muxer->delayPos] * GAIN;
     muxer->delay[muxer->delayPos] = in + (muxer->delay[muxer->delayPos] * FEEDBACK);
     muxer->delayPos++;
     if (muxer->delayPos > delaySize) muxer->delayPos = 0;
     *out++ = (in * DRY) + (sample * WET);
   }
-  
+
   return 0;
 }
 
@@ -76,11 +82,11 @@ static Muxer* muxer;
 void initMuxer()
 {
   muxer = new Muxer();
-  
+
   dealWithPaError(Pa_Initialize());
   dealWithPaError(Pa_OpenDefaultStream(&muxer->stream, 0, 1, paFloat32, SAMPLE_RATE, paFramesPerBufferUnspecified, paMuxerCallback, muxer));
   dealWithPaError(Pa_StartStream(muxer->stream));
-  
+
   muxer->delay = (float*) calloc(delaySize, sizeof(float));
 }
 
@@ -89,7 +95,7 @@ void destroyMuxer()
   dealWithPaError(Pa_AbortStream(muxer->stream));
   dealWithPaError(Pa_CloseStream(muxer->stream));
   dealWithPaError(Pa_Terminate());
-  
+
   free(muxer->delay);
   delete muxer;
   muxer = 0;
@@ -98,8 +104,8 @@ void destroyMuxer()
 void playSound(const char* filename, float vol)
 {
   // First, clear out any sounds that have finished playing
-  muxer->playing.remove_if([] (Sound& value) { return value.pos >= value.len; });
-  
+  muxer->playing.remove_if([] (Sound& value) { return value.isDone(); });
+
   // Then, add the new sound
   muxer->playing.emplace_back(filename, vol);
 }
@@ -110,21 +116,18 @@ Sound::Sound(const char* filename, float vol)
   SNDFILE* file = sf_open(filename, SFM_READ, &info);
   if (file == nullptr)
   {
-    printf("LibSndFile error: %s\n", sf_strerror(file));
-    exit(-1);
+    std::ostringstream errmsg;
+    errmsg << "LibSndFile error: ";
+    errmsg << sf_strerror(file);
+
+    throw std::logic_error(errmsg.str());
   }
-  
-  ptr = (float*) malloc(info.frames * info.channels * sizeof(float));
-  len = info.frames * info.channels;
+
+  data.resize(info.frames * info.channels);
   pos = 0;
   this->vol = vol;
-  
-  sf_readf_float(file, ptr, info.frames);
-  
-  sf_close(file);
-}
 
-Sound::~Sound()
-{
-  free(ptr);
+  sf_readf_float(file, data.data(), info.frames);
+
+  sf_close(file);
 }
@@ -56,11 +56,11 @@ static GLuint mesh_normalbuffer;
 static int mesh_numvertices;
 
 GLuint LoadShaders(const char* vertex_file_path, const char* fragment_file_path)
-{ 
+{
     // Create the shaders
     GLuint VertexShaderID = glCreateShader(GL_VERTEX_SHADER);
     GLuint FragmentShaderID = glCreateShader(GL_FRAGMENT_SHADER);
- 
+
     // Read the Vertex Shader code from the file
     std::string VertexShaderCode;
     std::ifstream VertexShaderStream(vertex_file_path, std::ios::in);
@@ -71,7 +71,7 @@ GLuint LoadShaders(const char* vertex_file_path, const char* fragment_file_path)
             VertexShaderCode += "\n" + Line;
         VertexShaderStream.close();
     }
- 
+
     // Read the Fragment Shader code from the file
     std::string FragmentShaderCode;
     std::ifstream FragmentShaderStream(fragment_file_path, std::ios::in);
@@ -81,53 +81,53 @@ GLuint LoadShaders(const char* vertex_file_path, const char* fragment_file_path)
             FragmentShaderCode += "\n" + Line;
         FragmentShaderStream.close();
     }
- 
+
     GLint Result = GL_FALSE;
     int InfoLogLength;
- 
+
     // Compile Vertex Shader
     printf("Compiling shader : %s\n", vertex_file_path);
     char const * VertexSourcePointer = VertexShaderCode.c_str();
     glShaderSource(VertexShaderID, 1, &VertexSourcePointer , nullptr);
     glCompileShader(VertexShaderID);
- 
+
     // Check Vertex Shader
     glGetShaderiv(VertexShaderID, GL_COMPILE_STATUS, &Result);
     glGetShaderiv(VertexShaderID, GL_INFO_LOG_LENGTH, &InfoLogLength);
     std::vector<char> VertexShaderErrorMessage(InfoLogLength);
     glGetShaderInfoLog(VertexShaderID, InfoLogLength, nullptr, &VertexShaderErrorMessage[0]);
     fprintf(stdout, "%s\n", &VertexShaderErrorMessage[0]);
- 
+
     // Compile Fragment Shader
     printf("Compiling shader : %s\n", fragment_file_path);
     char const * FragmentSourcePointer = FragmentShaderCode.c_str();
     glShaderSource(FragmentShaderID, 1, &FragmentSourcePointer , nullptr);
     glCompileShader(FragmentShaderID);
- 
+
     // Check Fragment Shader
     glGetShaderiv(FragmentShaderID, GL_COMPILE_STATUS, &Result);
     glGetShaderiv(FragmentShaderID, GL_INFO_LOG_LENGTH, &InfoLogLength);
     std::vector<char> FragmentShaderErrorMessage(InfoLogLength);
     glGetShaderInfoLog(FragmentShaderID, InfoLogLength, nullptr, &FragmentShaderErrorMessage[0]);
     fprintf(stdout, "%s\n", &FragmentShaderErrorMessage[0]);
- 
+
     // Link the program
     fprintf(stdout, "Linking program\n");
     GLuint ProgramID = glCreateProgram();
     glAttachShader(ProgramID, VertexShaderID);
     glAttachShader(ProgramID, FragmentShaderID);
     glLinkProgram(ProgramID);
- 
+
     // Check the program
     glGetProgramiv(ProgramID, GL_LINK_STATUS, &Result);
     glGetProgramiv(ProgramID, GL_INFO_LOG_LENGTH, &InfoLogLength);
     std::vector<char> ProgramErrorMessage( glm::max(InfoLogLength, int(1)) );
     glGetProgramInfoLog(ProgramID, InfoLogLength, nullptr, &ProgramErrorMessage[0]);
     fprintf(stdout, "%s\n", &ProgramErrorMessage[0]);
- 
+
     glDeleteShader(VertexShaderID);
     glDeleteShader(FragmentShaderID);
- 
+
     return ProgramID;
 }
 
@@ -135,14 +135,14 @@ void flipImageData(unsigned char* data, int width, int height, int comps)
 {
   unsigned char* data_copy = (unsigned char*) malloc(width*height*comps*sizeof(unsigned char));
   memcpy(data_copy, data, width*height*comps);
-  
+
   int row_size = width * comps;
-  
+
   for (int i=0;i<height;i++)
   {
     memcpy(data + (row_size*i), data_copy + (row_size*(height-i-1)), row_size);
   }
-  
+
   free(data_copy);
 }
 
@@ -154,11 +154,11 @@ void loadMesh(const char* filename, std::vector<glm::vec3>& out_vertices, std::v
     fprintf(stderr, "Could not open mesh file %s\n", filename);
     exit(1);
   }
-  
+
   std::vector<glm::vec3> temp_vertices;
   std::vector<glm::vec2> temp_uvs;
   std::vector<glm::vec3> temp_normals;
-  
+
   for (;;)
   {
     char lineHeader[256];
@@ -167,7 +167,7 @@ void loadMesh(const char* filename, std::vector<glm::vec3>& out_vertices, std::v
     {
       break;
     }
-    
+
     if (!strncmp(lineHeader, "v", 2))
     {
       glm::vec3 vertex;
@@ -187,7 +187,7 @@ void loadMesh(const char* filename, std::vector<glm::vec3>& out_vertices, std::v
     {
       int vertexIDs[3], uvIDs[3], normalIDs[3];
       fscanf(file, "%d/%d/%d %d/%d/%d %d/%d/%d\n", &vertexIDs[0], &uvIDs[0], &normalIDs[0], &vertexIDs[1], &uvIDs[1], &normalIDs[1], &vertexIDs[2], &uvIDs[2], &normalIDs[2]);
-      
+
       for (int i=0; i<3; i++)
       {
         out_vertices.push_back(temp_vertices[vertexIDs[i] - 1]);
@@ -202,24 +202,24 @@ void setFramebufferSize(GLFWwindow* w, int width, int height)
 {
   buffer_width = width;
   buffer_height = height;
-  
+
   glDeleteFramebuffers(1, &bloom_framebuffer);
   glDeleteRenderbuffers(1, &bloom_depthbuffer);
-  
+
   glGenFramebuffers(1, &bloom_framebuffer);
   glBindFramebuffer(GL_FRAMEBUFFER, bloom_framebuffer);
   GLenum DrawBuffers[1] = {GL_COLOR_ATTACHMENT1};
   glDrawBuffers(1, DrawBuffers);
-  
+
   glGenRenderbuffers(1, &bloom_depthbuffer);
   glBindRenderbuffer(GL_RENDERBUFFER, bloom_depthbuffer);
   glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT, width, height);
   glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, bloom_depthbuffer);
-  
+
   glDeleteTextures(1, &preBloomTex);
   glDeleteTextures(1, &bloomPassTex1);
   glDeleteTextures(1, &bloomPassTex2);
-  
+
   glGenTextures(1, &preBloomTex);
   glBindTexture(GL_TEXTURE_2D, preBloomTex);
   glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, 0);
@@ -227,7 +227,7 @@ void setFramebufferSize(GLFWwindow* w, int width, int height)
   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
-  
+
   glGenTextures(1, &bloomPassTex1);
   glBindTexture(GL_TEXTURE_2D, bloomPassTex1);
   glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width/4, height/4, 0, GL_RGB, GL_UNSIGNED_BYTE, 0);
@@ -235,7 +235,7 @@ void setFramebufferSize(GLFWwindow* w, int width, int height)
   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
-  
+
   glGenTextures(1, &bloomPassTex2);
   glBindTexture(GL_TEXTURE_2D, bloomPassTex2);
   glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width/4, height/4, 0, GL_RGB, GL_UNSIGNED_BYTE, 0);
@@ -252,20 +252,20 @@ GLFWwindow* initRenderer()
     fprintf(stderr, "Renderer already initialized\n");
     exit(-1);
   }
-  
+
   // Initialize GLFW
   if (!glfwInit())
   {
     fprintf(stderr, "Failed to initialize GLFW\n");
     exit(-1);
   }
-  
+
   glfwWindowHint(GLFW_SAMPLES, 4); // 4x antialiasing
   glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3); // We want version 3.3
   glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
   glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE); // Mac requires this
   glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
-  
+
   // Create a window
   window = glfwCreateWindow(1024, 768, "Aromatherapy", nullptr, nullptr);
   if (window == nullptr)
@@ -274,7 +274,7 @@ GLFWwindow* initRenderer()
     glfwTerminate();
     exit(-1);
   }
-  
+
   glfwMakeContextCurrent(window);
   glewExperimental = true; // Needed in core profile
   if (glewInit() != GLEW_OK)
@@ -282,37 +282,37 @@ GLFWwindow* initRenderer()
     fprintf(stderr, "Failed to initialize GLEW\n");
     exit(-1);
   }
-  
+
   glfwSetFramebufferSizeCallback(window, &setFramebufferSize);
-  
+
   // Set up vertex array object
   glGenVertexArrays(1, &VertexArrayID);
   glBindVertexArray(VertexArrayID);
-  
+
   // Enable depth testing
   glEnable(GL_DEPTH_TEST);
   glDepthFunc(GL_LESS);
-  
+
   // Enable blending
   glEnable(GL_BLEND);
   glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
-  
+
   // Set up the framebuffer
   glGenFramebuffers(1, &generic_framebuffer);
   glBindFramebuffer(GL_FRAMEBUFFER, generic_framebuffer);
   GLenum DrawBuffers[1] = {GL_COLOR_ATTACHMENT0};
   glDrawBuffers(1, DrawBuffers);
-  
+
   glGenFramebuffers(1, &bloom_framebuffer);
   glBindFramebuffer(GL_FRAMEBUFFER, bloom_framebuffer);
   GLenum DrawBuffers2[1] = {GL_COLOR_ATTACHMENT1};
   glDrawBuffers(1, DrawBuffers2);
-  
+
   glGenRenderbuffers(1, &bloom_depthbuffer);
   glBindRenderbuffer(GL_RENDERBUFFER, bloom_depthbuffer);
   glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT, 1024, 768);
   glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, bloom_depthbuffer);
-  
+
   // Set up the NTSC rendering buffers
   glGenTextures(1, &renderedTex1);
   glBindTexture(GL_TEXTURE_2D, renderedTex1);
@@ -322,7 +322,7 @@ GLFWwindow* initRenderer()
   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
   renderedTexBufs[0] = renderedTex1;
-  
+
   glGenTextures(1, &renderedTex2);
   glBindTexture(GL_TEXTURE_2D, renderedTex2);
   glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, GAME_WIDTH, GAME_HEIGHT, 0, GL_RGB, GL_UNSIGNED_BYTE, 0);
@@ -331,7 +331,7 @@ GLFWwindow* initRenderer()
   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
   renderedTexBufs[1] = renderedTex2;
-  
+
   // Set up bloom rendering buffers
   glGenTextures(1, &preBloomTex);
   glBindTexture(GL_TEXTURE_2D, preBloomTex);
@@ -340,7 +340,7 @@ GLFWwindow* initRenderer()
   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
-  
+
   glGenTextures(1, &bloomPassTex1);
   glBindTexture(GL_TEXTURE_2D, bloomPassTex1);
   glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 1024/4, 768/4, 0, GL_RGB, GL_UNSIGNED_BYTE, 0);
@@ -348,7 +348,7 @@ GLFWwindow* initRenderer()
   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
-  
+
   glGenTextures(1, &bloomPassTex2);
   glBindTexture(GL_TEXTURE_2D, bloomPassTex2);
   glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 1024/4, 768/4, 0, GL_RGB, GL_UNSIGNED_BYTE, 0);
@@ -356,31 +356,32 @@ GLFWwindow* initRenderer()
   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
-  
+
   curBuf = 0;
-  
+
   // Load the mesh!
   std::vector<glm::vec3> mesh_vertices;
   std::vector<glm::vec2> mesh_uvs;
   std::vector<glm::vec3> mesh_normals;
+
   loadMesh("res/monitor-old.obj", mesh_vertices, mesh_uvs, mesh_normals);
-  
+
   mesh_numvertices = mesh_vertices.size();
-  
+
   glGenBuffers(1, &mesh_vertexbuffer);
   glBindBuffer(GL_ARRAY_BUFFER, mesh_vertexbuffer);
   glBufferData(GL_ARRAY_BUFFER, mesh_vertices.size() * sizeof(glm::vec3), &mesh_vertices[0], GL_STATIC_DRAW);
-  
+
   glGenBuffers(1, &mesh_uvbuffer);
   glBindBuffer(GL_ARRAY_BUFFER, mesh_uvbuffer);
   glBufferData(GL_ARRAY_BUFFER, mesh_uvs.size() * sizeof(glm::vec3), &mesh_uvs[0], GL_STATIC_DRAW);
-  
+
   glGenBuffers(1, &mesh_normalbuffer);
   glBindBuffer(GL_ARRAY_BUFFER, mesh_normalbuffer);
   glBufferData(GL_ARRAY_BUFFER, mesh_normals.size() * sizeof(glm::vec3), &mesh_normals[0], GL_STATIC_DRAW);
-  
+
   // Load the vertices of a flat surface
-  GLfloat g_quad_vertex_buffer_data[] = { 
+  GLfloat g_quad_vertex_buffer_data[] = {
                 -1.0f, -1.0f, 0.0f,
                  1.0f, -1.0f, 0.0f,
                 -1.0f,  1.0f, 0.0f,
@@ -392,7 +393,7 @@ GLFWwindow* initRenderer()
   glGenBuffers(1, &quad_vertexbuffer);
   glBindBuffer(GL_ARRAY_BUFFER, quad_vertexbuffer);
   glBufferData(GL_ARRAY_BUFFER, sizeof(g_quad_vertex_buffer_data), g_quad_vertex_buffer_data, GL_STATIC_DRAW);
-  
+
   glGenTextures(1, &artifactsTex);
   glBindTexture(GL_TEXTURE_2D, artifactsTex);
   int atdw, atdh;
@@ -403,7 +404,7 @@ GLFWwindow* initRenderer()
   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST_MIPMAP_NEAREST);
   glGenerateMipmap(GL_TEXTURE_2D);
-  
+
   glGenTextures(1, &scanlinesTex);
   glBindTexture(GL_TEXTURE_2D, scanlinesTex);
   int stdw, stdh;
@@ -414,7 +415,7 @@ GLFWwindow* initRenderer()
   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST_MIPMAP_NEAREST);
   glGenerateMipmap(GL_TEXTURE_2D);
-  
+
   // Load the shaders
   ntscShader = LoadShaders("shaders/ntsc.vertex", "shaders/ntsc.fragment");
   finalShader = LoadShaders("shaders/final.vertex", "shaders/final.fragment");
@@ -422,9 +423,9 @@ GLFWwindow* initRenderer()
   fillShader = LoadShaders("shaders/fill.vertex", "shaders/fill.fragment");
   bloom1Shader = LoadShaders("shaders/bloom1.vertex", "shaders/bloom1.fragment");
   bloom2Shader = LoadShaders("shaders/bloom2.vertex", "shaders/bloom2.fragment");
-  
+
   rendererInitialized = true;
-  
+
   return window;
 }
 
@@ -435,13 +436,13 @@ void destroyRenderer()
     fprintf(stderr, "Renderer not initialized\n");
     exit(-1);
   }
-  
+
   // Delete the plane buffer
   glDeleteBuffers(1, &quad_vertexbuffer);
   glDeleteBuffers(1, &mesh_vertexbuffer);
   glDeleteBuffers(1, &mesh_uvbuffer);
   glDeleteBuffers(1, &mesh_normalbuffer);
-  
+
   // Delete the shaders
   glDeleteProgram(ntscShader);
   glDeleteProgram(finalShader);
@@ -449,7 +450,7 @@ void destroyRenderer()
   glDeleteProgram(fillShader);
   glDeleteProgram(bloom1Shader);
   glDeleteProgram(bloom2Shader);
-  
+
   // Delete the NTSC rendering buffers
   glDeleteTextures(1, &renderedTex1);
   glDeleteTextures(1, &renderedTex2);
@@ -458,18 +459,18 @@ void destroyRenderer()
   glDeleteTextures(1, &preBloomTex);
   glDeleteTextures(1, &bloomPassTex1);
   glDeleteTextures(1, &bloomPassTex2);
-  
+
   // Delete the framebuffer
   glDeleteRenderbuffers(1, &bloom_depthbuffer);
   glDeleteFramebuffers(1, &bloom_framebuffer);
   glDeleteFramebuffers(1, &generic_framebuffer);
-  
+
   // Delete the VAO
   glDeleteVertexArrays(1, &VertexArrayID);
-  
+
   // Kill the window
   glfwTerminate();
-  
+
   rendererInitialized = false;
 }
 
@@ -480,10 +481,10 @@ Texture::Texture(int width, int height)
     fprintf(stderr, "Renderer not initialized\n");
     exit(-1);
   }
-  
+
   this->width = width;
   this->height = height;
-  
+
   glGenTextures(1, &texID);
   glBindTexture(GL_TEXTURE_2D, texID);
   glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
@@ -500,7 +501,7 @@ Texture::Texture(const char* filename)
     fprintf(stderr, "Renderer not initialized\n");
     exit(-1);
   }
-  
+
   glGenTextures(1, &texID);
   glBindTexture(GL_TEXTURE_2D, texID);
   unsigned char* data = stbi_load(filename, &width, &height, 0, 4);
@@ -520,14 +521,14 @@ Texture::Texture(const Texture& tex)
     fprintf(stderr, "Renderer not initialized\n");
     exit(-1);
   }
-  
+
   width = tex.width;
   height = tex.height;
-  
+
   unsigned char* data = (unsigned char*) malloc(4 * width * height);
   glBindTexture(GL_TEXTURE_2D, tex.texID);
   glGetTexImage(GL_TEXTURE_2D, 0, GL_RGBA, GL_UNSIGNED_BYTE, data);
-  
+
   glGenTextures(1, &texID);
   glBindTexture(GL_TEXTURE_2D, texID);
   glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, data);
@@ -535,7 +536,7 @@ Texture::Texture(const Texture& tex)
   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
-  
+
   free(data);
 }
 
@@ -551,14 +552,14 @@ Texture::~Texture()
     fprintf(stderr, "Renderer not initialized\n");
     exit(-1);
   }
-  
+
   glDeleteTextures(1, &texID);
 }
 
 Texture& Texture::operator= (Texture tex)
 {
   swap(*this, tex);
-  
+
   return *this;
 }
 
@@ -576,17 +577,17 @@ void Texture::fill(Rectangle dstrect, int r, int g, int b)
     fprintf(stderr, "Renderer not initialized\n");
     exit(-1);
   }
-  
+
   // Target the framebuffer
   glBindFramebuffer(GL_FRAMEBUFFER, generic_framebuffer);
   glFramebufferTexture(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, texID, 0);
-  
+
   // Set up the vertex attributes
   GLfloat minx = (GLfloat) dstrect.x / width * 2.0 - 1.0;
   GLfloat miny = -((GLfloat) dstrect.y / height * 2.0 - 1.0);
   GLfloat maxx = (GLfloat) (dstrect.x + dstrect.w) / width * 2.0 - 1.0;
   GLfloat maxy = -((GLfloat) (dstrect.y + dstrect.h) / height * 2.0 - 1.0);
-  
+
   GLfloat vertexbuffer_data[] = {
     minx, miny,
     maxx, miny,
@@ -601,14 +602,14 @@ void Texture::fill(Rectangle dstrect, int r, int g, int b)
   glBufferData(GL_ARRAY_BUFFER, sizeof(vertexbuffer_data), vertexbuffer_data, GL_STATIC_DRAW);
   glEnableVertexAttribArray(0);
   glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 0, (void*)0);
-  
+
   glViewport(0, 0, width, height);
   glClear(GL_DEPTH_BUFFER_BIT);
   glUseProgram(fillShader);
   glUniform3f(glGetUniformLocation(fillShader, "vecColor"), r / 255.0, g / 255.0, b / 255.0);
-  
+
   glDrawArrays(GL_TRIANGLES, 0, 6);
-  
+
   glDisableVertexAttribArray(0);
   glDeleteBuffers(1, &vertexbuffer);
 }
@@ -620,19 +621,19 @@ void Texture::blit(const Texture& srctex, Rectangle srcrect, Rectangle dstrect,
     fprintf(stderr, "Renderer not initialized\n");
     exit(-1);
   }
-  
+
   alpha = glm::clamp(alpha, 0.0, 1.0);
-  
+
   // Target the framebuffer
   glBindFramebuffer(GL_FRAMEBUFFER, generic_framebuffer);
   glFramebufferTexture(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, texID, 0);
-  
+
   // Set up the vertex attributes
   GLfloat minx = (GLfloat) dstrect.x / width * 2.0 - 1.0;
   GLfloat miny = -((GLfloat) dstrect.y / height * 2.0 - 1.0);
   GLfloat maxx = (GLfloat) (dstrect.x + dstrect.w) / width * 2.0 - 1.0;
   GLfloat maxy = -((GLfloat) (dstrect.y + dstrect.h) / height * 2.0 - 1.0);
-  
+
   GLfloat vertexbuffer_data[] = {
     minx, miny,
     maxx, miny,
@@ -645,12 +646,12 @@ void Texture::blit(const Texture& srctex, Rectangle srcrect, Rectangle dstrect,
   glBufferData(GL_ARRAY_BUFFER, sizeof(vertexbuffer_data), vertexbuffer_data, GL_STATIC_DRAW);
   glEnableVertexAttribArray(0);
   glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 0, (void*)0);
-  
+
   GLfloat minu = (GLfloat) srcrect.x / srctex.width;
   GLfloat minv = 1 - ((GLfloat) srcrect.y / srctex.height);
   GLfloat maxu = (GLfloat) (srcrect.x + srcrect.w) / srctex.width;
   GLfloat maxv = 1 - ((GLfloat) (srcrect.y + srcrect.h) / srctex.height);
-  
+
   GLfloat texcoordbuffer_data[] = {
     minu, minv,
     maxu, minv,
@@ -663,20 +664,20 @@ void Texture::blit(const Texture& srctex, Rectangle srcrect, Rectangle dstrect,
   glBufferData(GL_ARRAY_BUFFER, sizeof(texcoordbuffer_data), texcoordbuffer_data, GL_STATIC_DRAW);
   glEnableVertexAttribArray(1);
   glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 0, (void*)0);
-  
+
   // Set up the shader
   glUseProgram(blitShader);
   glClear(GL_DEPTH_BUFFER_BIT);
   glViewport(0, 0, width, height);
-  
+
   glActiveTexture(GL_TEXTURE0);
   glBindTexture(GL_TEXTURE_2D, srctex.texID);
   glUniform1i(glGetUniformLocation(blitShader, "srctex"), 0);
   glUniform1f(glGetUniformLocation(blitShader, "alpha"), alpha);
-  
+
   // Blit!
   glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
-  
+
   // Unload everything
   glDisableVertexAttribArray(1);
   glDisableVertexAttribArray(0);
@@ -691,11 +692,11 @@ void bloomPass1(GLuint srcTex, GLuint dstTex, bool horizontal, glm::vec2 srcRes,
   glViewport(0,0,dstRes.x,dstRes.y);
   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
   glUseProgram(bloom1Shader);
-  
+
   glActiveTexture(GL_TEXTURE0);
   glBindTexture(GL_TEXTURE_2D, srcTex);
   glUniform1i(glGetUniformLocation(bloom1Shader, "inTex"), 0);
-  
+
   glm::vec2 offset = glm::vec2(0.0);
   if (horizontal)
   {
@@ -703,9 +704,9 @@ void bloomPass1(GLuint srcTex, GLuint dstTex, bool horizontal, glm::vec2 srcRes,
   } else {
     offset.y = 1.2/srcRes.y;
   }
-  
+
   glUniform2f(glGetUniformLocation(bloom1Shader, "offset"), offset.x, offset.y);
-  
+
   glEnableVertexAttribArray(0);
   glBindBuffer(GL_ARRAY_BUFFER, quad_vertexbuffer);
   glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, (void*)0);
@@ -720,17 +721,17 @@ void Texture::renderScreen() const
     fprintf(stderr, "Renderer not initialized\n");
     exit(-1);
   }
-  
+
   // First we're going to composite our frame with the previous frame
   // We start by setting up the framebuffer
   glBindFramebuffer(GL_FRAMEBUFFER, generic_framebuffer);
   glFramebufferTexture(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, renderedTexBufs[curBuf], 0);
-  
+
   // Set up the shader
   glViewport(0,0,GAME_WIDTH,GAME_HEIGHT);
   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
   glUseProgram(ntscShader);
-  
+
   // Use the current frame texture, nearest neighbor and clamped to edge
   glActiveTexture(GL_TEXTURE0);
   glBindTexture(GL_TEXTURE_2D, texID);
@@ -739,7 +740,7 @@ void Texture::renderScreen() const
   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
   glUniform1i(glGetUniformLocation(ntscShader, "curFrameSampler"), 0);
-  
+
   // Use the previous frame composite texture, nearest neighbor and clamped to edge
   glActiveTexture(GL_TEXTURE1);
   glBindTexture(GL_TEXTURE_2D, renderedTexBufs[(curBuf + 1) % 2]);
@@ -748,13 +749,13 @@ void Texture::renderScreen() const
   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
   glUniform1i(glGetUniformLocation(ntscShader, "prevFrameSampler"), 1);
-  
+
   // Load the NTSC artifact texture
   glActiveTexture(GL_TEXTURE2);
   glBindTexture(GL_TEXTURE_2D, artifactsTex);
   glUniform1i(glGetUniformLocation(ntscShader, "NTSCArtifactSampler"), 2);
   glUniform1f(glGetUniformLocation(ntscShader, "NTSCLerp"), curBuf * 1.0);
-  
+
   if ((rand() % 60) == 0)
   {
     // Change the 0.0 to a 1.0 or a 10.0 for a glitchy effect!
@@ -762,7 +763,7 @@ void Texture::renderScreen() const
   } else {
     glUniform1f(glGetUniformLocation(ntscShader, "Tuning_NTSC"), 0.0);
   }
-  
+
   // Render our composition
   glEnableVertexAttribArray(0);
   glBindBuffer(GL_ARRAY_BUFFER, quad_vertexbuffer);
@@ -776,7 +777,7 @@ void Texture::renderScreen() const
   glViewport(0,0,buffer_width,buffer_height);
   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
   glUseProgram(finalShader);
-  
+
   // Use the composited frame texture, linearly filtered and filling in black for the border
   glActiveTexture(GL_TEXTURE0);
   glBindTexture(GL_TEXTURE_2D, renderedTexBufs[curBuf]);
@@ -788,70 +789,70 @@ void Texture::renderScreen() const
   glTexParameterfv(GL_TEXTURE_2D, GL_TEXTURE_BORDER_COLOR, border_color);
         glGenerateMipmap(GL_TEXTURE_2D);
   glUniform1i(glGetUniformLocation(finalShader, "rendertex"), 0);
-  
+
   // Use the scanlines texture
   glActiveTexture(GL_TEXTURE1);
   glBindTexture(GL_TEXTURE_2D, scanlinesTex);
   glUniform1i(glGetUniformLocation(finalShader, "scanlinestex"), 1);
-  
+
   // Initialize the MVP matrices
   glm::mat4 p_matrix = glm::perspective(glm::radians(25.0f), (float) buffer_width / (float) buffer_height, 0.1f, 100.0f);
   glm::mat4 v_matrix = glm::lookAt(glm::vec3(3.75,0,0), glm::vec3(0,0,0), glm::vec3(0,1,0));
   glm::mat4 m_matrix = glm::mat4(1.0);
   glm::mat4 mvp_matrix = p_matrix * v_matrix * m_matrix;
-  
+
   glUniformMatrix4fv(glGetUniformLocation(finalShader, "MVP"), 1, GL_FALSE, &mvp_matrix[0][0]);
   glUniformMatrix4fv(glGetUniformLocation(finalShader, "worldMat"), 1, GL_FALSE, &m_matrix[0][0]);
   glUniform2f(glGetUniformLocation(finalShader, "resolution"), buffer_width, buffer_height);
   glUniform1f(glGetUniformLocation(finalShader, "iGlobalTime"), glfwGetTime());
   glUniform3f(glGetUniformLocation(finalShader, "frameColor"), 0.76f, 0.78f, 0.81f);
-  
+
   glEnableVertexAttribArray(0);
   glBindBuffer(GL_ARRAY_BUFFER, mesh_vertexbuffer);
   glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, (void*)0);
-  
+
   glEnableVertexAttribArray(1);
   glBindBuffer(GL_ARRAY_BUFFER, mesh_normalbuffer);
   glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 0, (void*)0);
-  
+
   glEnableVertexAttribArray(2);
   glBindBuffer(GL_ARRAY_BUFFER, mesh_uvbuffer);
   glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, 0, (void*)0);
-  
+
   glDrawArrays(GL_TRIANGLES, 0, mesh_numvertices);
   glDisableVertexAttribArray(2);
   glDisableVertexAttribArray(1);
   glDisableVertexAttribArray(0);
-  
+
   // First pass of bloom!
   glm::vec2 buffer_size = glm::vec2(buffer_width, buffer_height);
   bloomPass1(preBloomTex, bloomPassTex1, true, buffer_size, buffer_size / 4.0f);
   bloomPass1(bloomPassTex1, bloomPassTex2, false, buffer_size / 4.0f, buffer_size / 4.0f);
-  
+
   // Do the second pass of bloom and render to screen
   glBindFramebuffer(GL_FRAMEBUFFER, 0);
   glViewport(0, 0, buffer_width, buffer_height);
   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
   glUseProgram(bloom2Shader);
-  
+
   glActiveTexture(GL_TEXTURE0);
   glBindTexture(GL_TEXTURE_2D, preBloomTex);
   glUniform1i(glGetUniformLocation(bloom2Shader, "clearTex"), 0);
-  
+
   glActiveTexture(GL_TEXTURE1);
   glBindTexture(GL_TEXTURE_2D, bloomPassTex2);
   glUniform1i(glGetUniformLocation(bloom2Shader, "blurTex"), 1);
-  
+
   glUniform1f(glGetUniformLocation(bloom2Shader, "iGlobalTime"), glfwGetTime());
-  
+
   glEnableVertexAttribArray(0);
   glBindBuffer(GL_ARRAY_BUFFER, quad_vertexbuffer);
   glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, (void*)0);
   glDrawArrays(GL_TRIANGLES, 0, 6);
   glDisableVertexAttribArray(0);
-  
+
   glfwSwapBuffers(window);
-  
+
   curBuf = (curBuf + 1) % 2;
 }
 
@@ -24,7 +24,7 @@ class Texture {
     void blit(const Texture& src, Rectangle srcrect, Rectangle dstrect, double alpha = 1.0);
     void renderScreen() const;
     Rectangle entirety() const;
-    
+
   private:
     GLuint texID;
     int width;
@@ -0,0 +1,55 @@
+#ifndef SYSTEM_H_B61A8CEA
+#define SYSTEM_H_B61A8CEA
+
+#include "entity_manager.h"
+
+class Game;
+class Texture;
+
+class System {
+public:
+
+  using id_type = EntityManager::id_type;
+
+  System(Game& game) : game_(game)
+  {
+  }
+
+  virtual ~System() = default;
+
+  /**
+   * Updates the state of a system.
+   *
+   * @param dt - The amount of time in seconds that have passed since the last
+   *             update.
+   */
+  virtual void tick(double)
+  {
+  }
+
+  /**
+   * Renders to a texture.
+   *
+   * @param texture - The surface to render to.
+   */
+  virtual void render(Texture&)
+  {
+  }
+
+  /**
+   * Processes keyboard input.
+   *
+   * @param key - The relevant key.
+   *
+   * @param action - The action performed (press, released, etc).
+   */
+  virtual void input(int, int)
+  {
+  }
+
+protected:
+
+  Game& game_;
+};
+
+#endif /* end of include guard: SYSTEM_H_B61A8CEA */
@@ -0,0 +1,68 @@
+#ifndef SYSTEM_MANAGER_H_544E6056
+#define SYSTEM_MANAGER_H_544E6056
+
+#include <list>
+#include <memory>
+#include <map>
+#include <typeindex>
+#include <stdexcept>
+#include "system.h"
+
+class SystemManager {
+private:
+
+  std::list<std::unique_ptr<System>> loop;
+  std::map<std::type_index, System*> systems;
+
+public:
+
+  template <class T, class... Args>
+  void emplaceSystem(Game& game, Args&&... args)
+  {
+    std::unique_ptr<T> ptr(new T(game, std::forward<Args>(args)...));
+    std::type_index systemType = typeid(T);
+
+    systems[systemType] = ptr.get();
+    loop.push_back(std::move(ptr));
+  }
+
+  template <class T>
+  T& getSystem()
+  {
+    std::type_index systemType = typeid(T);
+
+    if (!systems.count(systemType))
+    {
+      throw std::invalid_argument("Cannot get non-existent system");
+    }
+
+    return *dynamic_cast<T*>(systems[systemType]);
+  }
+
+  void tick(double dt)
+  {
+    for (std::unique_ptr<System>& sys : loop)
+    {
+      sys->tick(dt);
+    }
+  }
+
+  virtual void render(Texture& texture)
+  {
+    for (std::unique_ptr<System>& sys : loop)
+    {
+      sys->render(texture);
+    }
+  }
+
+  virtual void input(int key, int action)
+  {
+    for (std::unique_ptr<System>& sys : loop)
+    {
+      sys->input(key, action);
+    }
+  }
+
+};
+
+#endif /* end of include guard: SYSTEM_MANAGER_H_544E6056 */
@@ -0,0 +1,68 @@
+#include "animating.h"
+#include "game.h"
+#include "components/animatable.h"
+#include "components/transformable.h"
+
+void AnimatingSystem::tick(double)
+{
+  std::set<id_type> spriteEntities =
+    game_.getEntityManager().getEntitiesWithComponents<AnimatableComponent>();
+
+  for (id_type entity : spriteEntities)
+  {
+    auto& sprite = game_.getEntityManager().
+      getComponent<AnimatableComponent>(entity);
+
+    sprite.setCountdown(sprite.getCountdown() + 1);
+
+    const Animation& anim = sprite.getAnimation();
+    if (sprite.getCountdown() >= anim.getDelay())
+    {
+      sprite.setFrame(sprite.getFrame() + 1);
+      sprite.setCountdown(0);
+
+      if (sprite.getFrame() >= anim.getFirstFrame() + anim.getNumFrames())
+      {
+        sprite.setFrame(anim.getFirstFrame());
+      }
+    }
+  }
+}
+
+void AnimatingSystem::render(Texture& texture)
+{
+  std::set<id_type> spriteEntities =
+    game_.getEntityManager().getEntitiesWithComponents<
+      AnimatableComponent,
+      TransformableComponent>();
+
+  for (id_type entity : spriteEntities)
+  {
+    auto& sprite = game_.getEntityManager().
+      getComponent<AnimatableComponent>(entity);
+
+    auto& transform = game_.getEntityManager().
+      getComponent<TransformableComponent>(entity);
+
+    Rectangle dstrect {
+      static_cast<int>(transform.getX()),
+      static_cast<int>(transform.getY()),
+      transform.getW(),
+      transform.getH()};
+
+    const AnimationSet& aset = sprite.getAnimationSet();
+    texture.blit(
+      aset.getTexture(),
+      aset.getFrameRect(sprite.getFrame()),
+      dstrect);
+  }
+}
+
+void AnimatingSystem::startAnimation(id_type entity, std::string animation)
+{
+  auto& sprite = game_.getEntityManager().
+    getComponent<AnimatableComponent>(entity);
+
+  sprite.setAnimation(animation);
+  sprite.setFrame(sprite.getAnimation().getFirstFrame());
+}
@@ -0,0 +1,23 @@
+#ifndef ANIMATING_H_5BBF0094
+#define ANIMATING_H_5BBF0094
+
+#include "system.h"
+#include <string>
+#include "renderer.h"
+
+class AnimatingSystem : public System {
+public:
+
+  AnimatingSystem(Game& game) : System(game)
+  {
+  }
+
+  void tick(double dt);
+
+  void render(Texture& texture);
+
+  void startAnimation(id_type entity, std::string animation);
+
+};
+
+#endif /* end of include guard: ANIMATING_H_5BBF0094 */
@@ -0,0 +1,107 @@
+#include "controlling.h"
+#include "game.h"
+#include "components/controllable.h"
+#include "components/orientable.h"
+#include "systems/orienting.h"
+
+void ControllingSystem::tick(double)
+{
+  while (!actions_.empty())
+  {
+    int key = actions_.front().first;
+    int action = actions_.front().second;
+
+    auto entities = game_.getEntityManager().getEntitiesWithComponents<
+      ControllableComponent,
+      OrientableComponent>();
+
+    for (auto entity : entities)
+    {
+      auto& controllable = game_.getEntityManager().
+        getComponent<ControllableComponent>(entity);
+
+      auto& orienting = game_.getSystemManager().getSystem<OrientingSystem>();
+
+      if (action == GLFW_PRESS)
+      {
+        if (key == controllable.getLeftKey())
+        {
+          controllable.setHoldingLeft(true);
+
+          if (!controllable.isFrozen())
+          {
+            orienting.moveLeft(entity);
+          }
+        } else if (key == controllable.getRightKey())
+        {
+          controllable.setHoldingRight(true);
+
+          if (!controllable.isFrozen())
+          {
+            orienting.moveRight(entity);
+          }
+        } else if (key == controllable.getJumpKey())
+        {
+          if (!controllable.isFrozen())
+          {
+            orienting.jump(entity);
+          }
+        } else if (key == controllable.getDropKey())
+        {
+          if (!controllable.isFrozen())
+          {
+            orienting.drop(entity);
+          }
+        }
+      } else if (action == GLFW_RELEASE)
+      {
+        if (key == controllable.getLeftKey())
+        {
+          controllable.setHoldingLeft(false);
+
+          if (!controllable.isFrozen())
+          {
+            if (controllable.isHoldingRight())
+            {
+              orienting.moveRight(entity);
+            } else {
+              orienting.stopWalking(entity);
+            }
+          }
+        } else if (key == controllable.getRightKey())
+        {
+          controllable.setHoldingRight(false);
+
+          if (!controllable.isFrozen())
+          {
+            if (controllable.isHoldingLeft())
+            {
+              orienting.moveLeft(entity);
+            } else {
+              orienting.stopWalking(entity);
+            }
+          }
+        } else if (key == controllable.getDropKey())
+        {
+          if (!controllable.isFrozen())
+          {
+            orienting.stopDropping(entity);
+          }
+        } else if (key == controllable.getJumpKey())
+        {
+          if (!controllable.isFrozen())
+          {
+            orienting.stopJumping(entity);
+          }
+        }
+      }
+    }
+
+    actions_.pop();
+  }
+}
+
+void ControllingSystem::input(int key, int action)
+{
+  actions_.push(std::make_pair(key, action));
+}
@@ -0,0 +1,22 @@
+#ifndef CONTROLLING_H_80B1BB8D
+#define CONTROLLING_H_80B1BB8D
+
+#include "system.h"
+#include <queue>
+
+class ControllingSystem : public System {
+public:
+
+  ControllingSystem(Game& game) : System(game)
+  {
+  }
+
+  void tick(double dt);
+  void input(int key, int action);
+
+private:
+
+  std::queue<std::pair<int,int>> actions_;
+};
+
+#endif /* end of include guard: CONTROLLING_H_80B1BB8D */
@@ -0,0 +1,141 @@
+#include "mapping.h"
+#include "components/mappable.h"
+#include "game.h"
+#include "consts.h"
+
+template <typename Storage>
+inline void addBoundary(
+  Storage& boundaries,
+  int axis,
+  int lower,
+  int upper,
+  MappableComponent::Boundary::Type type)
+{
+  boundaries.emplace(std::piecewise_construct,
+    std::tie(axis),
+    std::tie(axis, lower, upper, type));
+}
+
+void MappingSystem::render(Texture& texture)
+{
+  auto entities = game_.getEntityManager().getEntitiesWithComponents<
+    MappableComponent>();
+
+  for (id_type entity : entities)
+  {
+    auto& mappable = game_.getEntityManager().
+      getComponent<MappableComponent>(entity);
+
+    const Map& map = game_.getWorld().getMap(mappable.getMapId());
+
+    for (int i = 0; i < MAP_WIDTH * MAP_HEIGHT; i++)
+    {
+      int x = i % MAP_WIDTH;
+      int y = i / MAP_WIDTH;
+      int tile = map.getTiles()[i];
+
+      if (tile > 0)
+      {
+        Rectangle dst {
+          x * TILE_WIDTH,
+          y * TILE_HEIGHT,
+          TILE_WIDTH,
+          TILE_HEIGHT};
+
+        Rectangle src {
+          (tile % TILESET_COLS) * TILE_WIDTH,
+          (tile / TILESET_COLS) * TILE_HEIGHT,
+          TILE_WIDTH,
+          TILE_HEIGHT};
+
+        texture.blit(mappable.getTileset(), std::move(src), std::move(dst));
+      }
+    }
+
+    int startX = ((GAME_WIDTH / TILE_WIDTH) / 2) - (map.getTitle().size() / 2);
+    for (size_t i = 0; i < map.getTitle().size(); i++)
+    {
+      Rectangle src {
+        (map.getTitle()[i] % FONT_COLS) * TILE_WIDTH,
+        (map.getTitle()[i] / FONT_COLS) * TILE_HEIGHT,
+        TILE_WIDTH,
+        TILE_HEIGHT};
+
+      Rectangle dst {
+        (startX + static_cast<int>(i)) * TILE_WIDTH,
+        24 * TILE_HEIGHT,
+        TILE_WIDTH,
+        TILE_HEIGHT};
+
+      texture.blit(mappable.getFont(), std::move(src), std::move(dst));
+    }
+  }
+}
+
+void MappingSystem::loadMap(size_t mapId)
+{
+  id_type mapEntity = game_.getEntityManager().emplaceEntity();
+
+  auto& mappable = game_.getEntityManager().
+    emplaceComponent<MappableComponent>(mapEntity,
+      Texture("res/tiles.png"),
+      Texture("res/font.bmp"));
+
+  mappable.setMapId(mapId);
+
+  const Map& map = game_.getWorld().getMap(mappable.getMapId());
+
+  for (size_t i = 0; i < MAP_WIDTH * MAP_HEIGHT; i++)
+  {
+    size_t x = i % MAP_WIDTH;
+    size_t y = i / MAP_WIDTH;
+    int tile = map.getTiles()[i];
+
+    if ((tile >= 5) && (tile <= 7))
+    {
+      addBoundary(
+        mappable.getDownBoundaries(),
+        y * TILE_HEIGHT,
+        x * TILE_WIDTH,
+        (x + 1) * TILE_WIDTH,
+        MappableComponent::Boundary::Type::platform);
+    } else if ((tile > 0) && (tile < 28))
+    {
+      addBoundary(
+        mappable.getRightBoundaries(),
+        x * TILE_WIDTH,
+        y * TILE_HEIGHT,
+        (y+1) * TILE_HEIGHT,
+        MappableComponent::Boundary::Type::wall);
+
+      addBoundary(
+        mappable.getLeftBoundaries(),
+        (x+1) * TILE_WIDTH,
+        y * TILE_HEIGHT,
+        (y+1) * TILE_HEIGHT,
+        MappableComponent::Boundary::Type::wall);
+
+      addBoundary(
+        mappable.getDownBoundaries(),
+        y * TILE_HEIGHT,
+        x * TILE_WIDTH,
+        (x+1) * TILE_WIDTH,
+        MappableComponent::Boundary::Type::wall);
+
+      addBoundary(
+        mappable.getUpBoundaries(),
+        (y+1) * TILE_HEIGHT,
+        x * TILE_WIDTH,
+        (x+1) * TILE_WIDTH,
+        MappableComponent::Boundary::Type::wall);
+    } else if (tile == 42)
+    {
+      addBoundary(
+        mappable.getDownBoundaries(),
+        y * TILE_HEIGHT,
+        x * TILE_WIDTH,
+        (x+1) * TILE_WIDTH,
+        MappableComponent::Boundary::Type::danger);
+    }
+  }
+}
@@ -0,0 +1,19 @@
+#ifndef MAPPING_H_33FC2294
+#define MAPPING_H_33FC2294
+
+#include "system.h"
+
+class MappingSystem : public System {
+public:
+
+  MappingSystem(Game& game) : System(game)
+  {
+  }
+
+  void render(Texture& texture);
+
+  void loadMap(size_t mapId);
+
+};
+
+#endif /* end of include guard: MAPPING_H_33FC2294 */
@@ -0,0 +1,236 @@
+#include "orienting.h"
+#include "game.h"
+#include "components/orientable.h"
+#include "components/ponderable.h"
+#include "systems/animating.h"
+#include "consts.h"
+#include "muxer.h"
+
+void OrientingSystem::tick(double)
+{
+  auto entities = game_.getEntityManager().getEntitiesWithComponents<
+    OrientableComponent,
+    PonderableComponent>();
+
+  for (id_type entity : entities)
+  {
+    auto& orientable = game_.getEntityManager().
+      getComponent<OrientableComponent>(entity);
+
+    auto& ponderable = game_.getEntityManager().
+      getComponent<PonderableComponent>(entity);
+
+    switch (orientable.getWalkState())
+    {
+      case OrientableComponent::WalkState::still:
+      {
+        ponderable.setVelocityX(0);
+
+        break;
+      }
+
+      case OrientableComponent::WalkState::left:
+      {
+        ponderable.setVelocityX(-WALK_SPEED);
+
+        break;
+      }
+
+      case OrientableComponent::WalkState::right:
+      {
+        ponderable.setVelocityX(WALK_SPEED);
+
+        break;
+      }
+    }
+
+    if (orientable.isJumping() && (ponderable.getVelocityY() > 0))
+    {
+      orientable.setJumping(false);
+    }
+  }
+}
+
+void OrientingSystem::moveLeft(id_type entity)
+{
+  auto& ponderable = game_.getEntityManager().
+    getComponent<PonderableComponent>(entity);
+
+  auto& orientable = game_.getEntityManager().
+    getComponent<OrientableComponent>(entity);
+
+  orientable.setFacingRight(false);
+  orientable.setWalkState(OrientableComponent::WalkState::left);
+
+  auto& animating = game_.getSystemManager().getSystem<AnimatingSystem>();
+  if (ponderable.isGrounded())
+  {
+    animating.startAnimation(entity, "walkingLeft");
+  } else {
+    animating.startAnimation(entity, "stillLeft");
+  }
+}
+
+void OrientingSystem::moveRight(id_type entity)
+{
+  auto& ponderable = game_.getEntityManager().
+    getComponent<PonderableComponent>(entity);
+
+  auto& orientable = game_.getEntityManager().
+    getComponent<OrientableComponent>(entity);
+
+  orientable.setFacingRight(true);
+  orientable.setWalkState(OrientableComponent::WalkState::right);
+
+  auto& animating = game_.getSystemManager().getSystem<AnimatingSystem>();
+  if (ponderable.isGrounded())
+  {
+    animating.startAnimation(entity, "walkingRight");
+  } else {
+    animating.startAnimation(entity, "stillRight");
+  }
+}
+
+void OrientingSystem::stopWalking(id_type entity)
+{
+  auto& ponderable = game_.getEntityManager().
+    getComponent<PonderableComponent>(entity);
+
+  auto& orientable = game_.getEntityManager().
+    getComponent<OrientableComponent>(entity);
+
+  orientable.setWalkState(OrientableComponent::WalkState::still);
+
+  if (ponderable.isGrounded())
+  {
+    auto& animating = game_.getSystemManager().getSystem<AnimatingSystem>();
+
+    if (orientable.isFacingRight())
+    {
+      animating.startAnimation(entity, "stillRight");
+    } else {
+      animating.startAnimation(entity, "stillLeft");
+    }
+  }
+}
+
+void OrientingSystem::jump(id_type entity)
+{
+  auto& ponderable = game_.getEntityManager().
+    getComponent<PonderableComponent>(entity);
+
+  if (ponderable.isGrounded())
+  {
+    auto& orientable = game_.getEntityManager().
+      getComponent<OrientableComponent>(entity);
+
+    orientable.setJumping(true);
+
+    playSound("res/Randomize87.wav", 0.25);
+
+    ponderable.setVelocityY(JUMP_VELOCITY);
+    ponderable.setAccelY(JUMP_GRAVITY);
+
+    auto& animating = game_.getSystemManager().getSystem<AnimatingSystem>();
+    if (orientable.isFacingRight())
+    {
+      animating.startAnimation(entity, "stillRight");
+    } else {
+      animating.startAnimation(entity, "stillLeft");
+    }
+  }
+}
+
+void OrientingSystem::stopJumping(id_type entity)
+{
+  auto& orientable = game_.getEntityManager().
+    getComponent<OrientableComponent>(entity);
+
+  if (orientable.isJumping())
+  {
+    orientable.setJumping(false);
+
+    auto& ponderable = game_.getEntityManager().
+      getComponent<PonderableComponent>(entity);
+
+    ponderable.setAccelY(NORMAL_GRAVITY);
+  }
+}
+
+void OrientingSystem::land(id_type entity)
+{
+  auto& orientable = game_.getEntityManager().
+    getComponent<OrientableComponent>(entity);
+
+  auto& animating = game_.getSystemManager().getSystem<AnimatingSystem>();
+
+  switch (orientable.getWalkState())
+  {
+    case OrientableComponent::WalkState::still:
+    {
+      if (orientable.isFacingRight())
+      {
+        animating.startAnimation(entity, "stillRight");
+      } else {
+        animating.startAnimation(entity, "stillLeft");
+      }
+
+      break;
+    }
+
+    case OrientableComponent::WalkState::left:
+    {
+      animating.startAnimation(entity, "walkingLeft");
+
+      break;
+    }
+
+    case OrientableComponent::WalkState::right:
+    {
+      animating.startAnimation(entity, "walkingRight");
+
+      break;
+    }
+  }
+}
+
+void OrientingSystem::startFalling(id_type entity)
+{
+  auto& orientable = game_.getEntityManager().
+    getComponent<OrientableComponent>(entity);
+
+  auto& animating = game_.getSystemManager().getSystem<AnimatingSystem>();
+
+  if (orientable.isFacingRight())
+  {
+    animating.startAnimation(entity, "stillRight");
+  } else {
+    animating.startAnimation(entity, "stillLeft");
+  }
+}
+
+void OrientingSystem::drop(id_type entity)
+{
+  auto& orientable = game_.getEntityManager().
+    getComponent<OrientableComponent>(entity);
+
+  auto& ponderable = game_.getEntityManager().
+    getComponent<PonderableComponent>(entity);
+
+  if (ponderable.isGrounded()
+    && (orientable.getDropState() == OrientableComponent::DropState::none))
+  {
+    orientable.setDropState(OrientableComponent::DropState::ready);
+  }
+}
+
+void OrientingSystem::stopDropping(id_type entity)
+{
+  auto& orientable = game_.getEntityManager().
+    getComponent<OrientableComponent>(entity);
+
+  if (orientable.getDropState() == OrientableComponent::DropState::ready)
+  {
+    orientable.setDropState(OrientableComponent::DropState::none);
+  }
+}
@@ -0,0 +1,35 @@
+#ifndef ORIENTING_H_099F0C23
+#define ORIENTING_H_099F0C23
+
+#include "system.h"
+
+class OrientingSystem : public System {
+public:
+
+  OrientingSystem(Game& game) : System(game)
+  {
+  }
+
+  void tick(double dt);
+
+  void moveLeft(id_type entity);
+
+  void moveRight(id_type entity);
+
+  void stopWalking(id_type entity);
+
+  void jump(id_type entity);
+
+  void stopJumping(id_type entity);
+
+  void land(id_type entity);
+
+  void startFalling(id_type entity);
+
+  void drop(id_type entity);
+
+  void stopDropping(id_type entity);
+
+};
+
+#endif /* end of include guard: ORIENTING_H_099F0C23 */
@@ -0,0 +1,268 @@
+#include "pondering.h"
+#include "game.h"
+#include "components/ponderable.h"
+#include "components/transformable.h"
+#include "components/orientable.h"
+#include "components/mappable.h"
+#include "systems/orienting.h"
+#include "consts.h"
+
+void PonderingSystem::tick(double dt)
+{
+  auto entities = game_.getEntityManager().getEntitiesWithComponents<
+    PonderableComponent,
+    TransformableComponent>();
+
+  auto maps = game_.getEntityManager().getEntitiesWithComponents<
+    MappableComponent>();
+
+  for (id_type entity : entities)
+  {
+    auto& transformable = game_.getEntityManager().
+      getComponent<TransformableComponent>(entity);
+
+    auto& ponderable = game_.getEntityManager().
+      getComponent<PonderableComponent>(entity);
+
+    // Accelerate
+    ponderable.setVelocityX(
+      ponderable.getVelocityX() + ponderable.getAccelX() * dt);
+
+    ponderable.setVelocityY(
+      ponderable.getVelocityY() + ponderable.getAccelY() * dt);
+
+    const double oldX = transformable.getX();
+    const double oldY = transformable.getY();
+    const double oldRight = oldX + transformable.getW();
+    const double oldBottom = oldY + transformable.getH();
+
+    double newX = oldX + ponderable.getVelocityX() * dt;
+    double newY = oldY + ponderable.getVelocityY() * dt;
+
+    bool oldGrounded = ponderable.isGrounded();
+    ponderable.setGrounded(false);
+
+    for (id_type mapEntity : maps)
+    {
+      auto& mappable = game_.getEntityManager().
+        getComponent<MappableComponent>(mapEntity);
+
+      if (newX < oldX)
+      {
+        for (auto it = mappable.getLeftBoundaries().lower_bound(oldX);
+          (it != std::end(mappable.getLeftBoundaries())) && (it->first >= newX);
+          it++)
+        {
+          if ((oldBottom > it->second.getLower())
+            && (oldY < it->second.getUpper()))
+          {
+            // We have a collision!
+            processCollision(
+              entity,
+              Direction::left,
+              newX,
+              newY,
+              it->first,
+              it->second.getType());
+          }
+        }
+      } else if (newX > oldX)
+      {
+        for (auto it = mappable.getRightBoundaries().lower_bound(oldRight);
+          (it != std::end(mappable.getRightBoundaries()))
+            && (it->first <= (newX + transformable.getW()));
+          it++)
+        {
+          if ((oldBottom > it->second.getLower())
+            && (oldY < it->second.getUpper()))
+          {
+            // We have a collision!
+            processCollision(
+              entity,
+              Direction::right,
+              newX,
+              newY,
+              it->first,
+              it->second.getType());
+          }
+        }
+      }
+
+      if (newY < oldY)
+      {
+        for (auto it = mappable.getUpBoundaries().lower_bound(oldY);
+          (it != std::end(mappable.getUpBoundaries())) && (it->first >= newY);
+          it++)
+        {
+          if ((oldRight > it->second.getLower())
+            && (oldX < it->second.getUpper()))
+          {
+            // We have a collision!
+            processCollision(
+              entity,
+              Direction::up,
+              newX,
+              newY,
+              it->first,
+              it->second.getType());
+          }
+        }
+      } else if (newY > oldY)
+      {
+        for (auto it = mappable.getDownBoundaries().lower_bound(oldBottom);
+          (it != std::end(mappable.getDownBoundaries()))
+            && (it->first <= (newY + transformable.getH()));
+          it++)
+        {
+          if ((oldRight > it->second.getLower())
+            && (oldX < it->second.getUpper()))
+          {
+            // We have a collision!
+            processCollision(
+              entity,
+              Direction::down,
+              newX,
+              newY,
+              it->first,
+              it->second.getType());
+          }
+        }
+      }
+    }
+
+    // Move
+    transformable.setX(newX);
+    transformable.setY(newY);
+
+    // Perform cleanup for orientable entites
+    if (game_.getEntityManager().hasComponent<OrientableComponent>(entity))
+    {
+      auto& orientable = game_.getEntityManager().
+        getComponent<OrientableComponent>(entity);
+
+      // Handle changes in groundedness
+      if (ponderable.isGrounded() != oldGrounded)
+      {
+        if (ponderable.isGrounded())
+        {
+          game_.getSystemManager().getSystem<OrientingSystem>().land(entity);
+        } else {
+          game_.getSystemManager().
+            getSystem<OrientingSystem>().startFalling(entity);
+        }
+      }
+
+      // Complete dropping, if necessary
+      if (orientable.getDropState() == OrientableComponent::DropState::active)
+      {
+        orientable.setDropState(OrientableComponent::DropState::none);
+      }
+    }
+  }
+}
+
+void PonderingSystem::initializeBody(
+  id_type entity,
+  PonderableComponent::Type type)
+{
+  auto& ponderable = game_.getEntityManager().
+    emplaceComponent<PonderableComponent>(entity, type);
+
+  if (type == PonderableComponent::Type::freefalling)
+  {
+    ponderable.setAccelY(NORMAL_GRAVITY);
+  }
+}
+
+void PonderingSystem::processCollision(
+  id_type entity,
+  Direction dir,
+  double& newX,
+  double& newY,
+  int axis,
+  MappableComponent::Boundary::Type type)
+{
+  auto& ponderable = game_.getEntityManager().
+    getComponent<PonderableComponent>(entity);
+
+  auto& transformable = game_.getEntityManager().
+    getComponent<TransformableComponent>(entity);
+
+  bool touchedGround = false;
+
+  switch (type)
+  {
+    case MappableComponent::Boundary::Type::wall:
+    {
+      switch (dir)
+      {
+        case Direction::left:
+        {
+          newX = axis;
+          ponderable.setVelocityX(0.0);
+
+          break;
+        }
+
+        case Direction::right:
+        {
+          newX = axis - transformable.getW();
+          ponderable.setVelocityX(0.0);
+
+          break;
+        }
+
+        case Direction::up:
+        {
+          newY = axis;
+          ponderable.setVelocityY(0.0);
+
+          break;
+        }
+
+        case Direction::down:
+        {
+          touchedGround = true;
+
+          break;
+        }
+      }
+
+      break;
+    }
+
+    case MappableComponent::Boundary::Type::platform:
+    {
+      if (game_.getEntityManager().hasComponent<OrientableComponent>(entity))
+      {
+        auto& orientable = game_.getEntityManager().
+          getComponent<OrientableComponent>(entity);
+
+        if (orientable.getDropState() != OrientableComponent::DropState::none)
+        {
+          orientable.setDropState(OrientableComponent::DropState::active);
+        } else {
+          touchedGround = true;
+        }
+      } else {
+        touchedGround = true;
+      }
+
+      break;
+    }
+
+    default:
+    {
+      // Not yet implemented.
+
+      break;
+    }
+  }
+
+  if (touchedGround)
+  {
+    newY = axis - transformable.getH();
+    ponderable.setVelocityY(0.0);
+    ponderable.setGrounded(true);
+  }
+}
@@ -0,0 +1,32 @@
+#ifndef PONDERING_H_F2530E0E
+#define PONDERING_H_F2530E0E
+
+#include "system.h"
+#include "components/mappable.h"
+#include "components/ponderable.h"
+#include "direction.h"
+
+class PonderingSystem : public System {
+public:
+
+  PonderingSystem(Game& game) : System(game)
+  {
+  }
+
+  void tick(double dt);
+
+  void initializeBody(id_type entity, PonderableComponent::Type type);
+
+private:
+
+  void processCollision(
+    id_type entity,
+    Direction dir,
+    double& newX,
+    double& newY,
+    int axis,
+    MappableComponent::Boundary::Type type);
+
+};
+
+#endif /* end of include guard: PONDERING_H_F2530E0E */
@@ -1,150 +1,99 @@
 #include "world.h"
 #include <libxml/parser.h>
+#include <stdexcept>
+#include <cstring>
 #include "consts.h"
 
-World::World(const char* filename)
+inline xmlChar* getProp(xmlNodePtr node, const char* attr)
 {
-  xmlDocPtr doc = xmlParseFile(filename);
+  xmlChar* key = xmlGetProp(node, reinterpret_cast<const xmlChar*>(attr));
+  if (key == nullptr)
+  {
+    throw std::invalid_argument("Error parsing world file");
+  }
+
+  return key;
+}
+
+World::World(std::string filename)
+{
+  xmlDocPtr doc = xmlParseFile(filename.c_str());
   if (doc == nullptr)
   {
-    exit(2);
+    throw std::invalid_argument("Cannot find world file");
   }
-  
+
   xmlNodePtr top = xmlDocGetRootElement(doc);
   if (top == nullptr)
   {
-    exit(2);
+    throw std::invalid_argument("Error parsing world file");
   }
-  
-  if (xmlStrcmp(top->name, (const xmlChar*) "world"))
+
+  if (xmlStrcmp(top->name, reinterpret_cast<const xmlChar*>("world")))
   {
-    exit(2);
+    throw std::invalid_argument("Error parsing world file");
   }
-  
-  xmlChar* startxKey = xmlGetProp(top, (xmlChar*) "startx");
-  if (startxKey == 0) exit(2);
-  startX = atoi((char*) startxKey);
-  xmlFree(startxKey);
-  
-  xmlChar* startyKey = xmlGetProp(top, (xmlChar*) "starty");
-  if (startyKey == 0) exit(2);
-  startY = atoi((char*) startyKey);
-  xmlFree(startyKey);
-  
-  xmlChar* startmapKey = xmlGetProp(top, (xmlChar*) "startmap");
-  if (startxKey == 0) exit(2);
-  startMap = atoi((char*) startmapKey);
-  xmlFree(startmapKey);
-  
-  for (xmlNodePtr node = top->xmlChildrenNode; node != NULL; node = node->next)
+
+  xmlChar* key = nullptr;
+
+  key = getProp(top, "startx");
+  startX_ = atoi(reinterpret_cast<char*>(key));
+  xmlFree(key);
+
+  key = getProp(top, "starty");
+  startY_ = atoi(reinterpret_cast<char*>(key));
+  xmlFree(key);
+
+  key = getProp(top, "startmap");
+  startMap_ = atoi(reinterpret_cast<char*>(key));
+  xmlFree(key);
+
+  for (xmlNodePtr node = top->xmlChildrenNode;
+    node != nullptr;
+    node = node->next)
   {
-    if (!xmlStrcmp(node->name, (const xmlChar*) "map"))
+    if (!xmlStrcmp(node->name, reinterpret_cast<const xmlChar*>("map")))
     {
-      xmlChar* idKey = xmlGetProp(node, (xmlChar*) "id");
-      if (idKey == 0) exit(2);
-      int theId = atoi((char*) idKey);
-      xmlFree(idKey);
-      
-      maps.emplace(theId, theId);
-      Map& map = maps[theId];
-      
-      xmlChar* titleKey = xmlGetProp(node, (xmlChar*) "title");
-      if (titleKey == 0) exit(2);
-      map.setTitle((char*) titleKey);
-      xmlFree(titleKey);
-      
-      for (xmlNodePtr mapNode = node->xmlChildrenNode; mapNode != NULL; mapNode = mapNode->next)
+      key = getProp(node, "id");
+      size_t mapId = atoi(reinterpret_cast<char*>(key));
+      xmlFree(key);
+
+      key = getProp(node, "title");
+      std::string mapTitle(reinterpret_cast<char*>(key));
+      xmlFree(key);
+
+      std::vector<int> mapTiles;
+
+      for (xmlNodePtr mapNode = node->xmlChildrenNode;
+        mapNode != nullptr;
+        mapNode = mapNode->next)
       {
-        if (!xmlStrcmp(mapNode->name, (const xmlChar*) "environment"))
+        if (!xmlStrcmp(
+          mapNode->name,
+          reinterpret_cast<const xmlChar*>("environment")))
         {
-          xmlChar* key = xmlNodeGetContent(mapNode);
-          int* mapdata = (int*) malloc(MAP_WIDTH*MAP_HEIGHT*sizeof(int));
-          mapdata[0] = atoi(strtok((char*) key, ",\n"));
-          for (int i=1; i<(MAP_WIDTH*MAP_HEIGHT); i++)
+          key = xmlNodeGetContent(mapNode);
+
+          mapTiles.clear();
+          mapTiles.push_back(atoi(strtok(reinterpret_cast<char*>(key), ",\n")));
+          for (size_t i = 1; i < (MAP_WIDTH * MAP_HEIGHT); i++)
           {
-            mapdata[i] = atoi(strtok(NULL, ",\n"));
+            mapTiles.push_back(atoi(strtok(nullptr, ",\n")));
           }
-          map.setMapdata(mapdata);
+
           xmlFree(key);
-        } else if (!xmlStrcmp(mapNode->name, (const xmlChar*) "entity"))
-        {
-          Map::EntityData data;
-          
-          xmlChar* typeKey = xmlGetProp(mapNode, (const xmlChar*) "type");
-          if (typeKey == 0) exit(2);
-          data.name = (char*) typeKey;
-          xmlFree(typeKey);
-          
-          xmlChar* xKey = xmlGetProp(mapNode, (const xmlChar*) "x");
-          if (xKey == 0) exit(2);
-          data.position.first = atoi((char*) xKey);
-          xmlFree(xKey);
-          
-          xmlChar* yKey = xmlGetProp(mapNode, (const xmlChar*) "y");
-          if (yKey == 0) exit(2);
-          data.position.second = atoi((char*) yKey);
-          xmlFree(yKey);
-          
-          for (xmlNodePtr entityNode = mapNode->xmlChildrenNode; entityNode != NULL; entityNode = entityNode->next)
-          {
-            if (!xmlStrcmp(entityNode->name, (xmlChar*) "item"))
-            {
-              xmlChar* itemIdKey = xmlGetProp(entityNode, (const xmlChar*) "id");
-              if (itemIdKey == 0) exit(2);
-              std::string itemId = (char*) itemIdKey;
-              xmlFree(itemIdKey);
-              
-              xmlChar* itemIdVal = xmlNodeGetContent(entityNode);
-              if (itemIdVal == 0) exit(2);
-              data.items[itemId] = atoi((char*) itemIdVal);
-              xmlFree(itemIdVal);
-            }
-          }
-          
-          map.addEntity(data);
-        } else if (!xmlStrcmp(mapNode->name, (const xmlChar*) "adjacent"))
-        {
-          Map::MoveDir direction;
-          Map::MoveType moveType;
-          int mapId = 0;
-          
-          xmlChar* dirKey = xmlGetProp(mapNode, (const xmlChar*) "dir");
-          if (dirKey == 0) exit(2);
-          direction = Map::moveDirForShort((char*) dirKey);
-          xmlFree(dirKey);
-          
-          xmlChar* typeKey = xmlGetProp(mapNode, (const xmlChar*) "type");
-          if (typeKey == 0) exit(2);
-          moveType = Map::moveTypeForShort((char*) typeKey);
-          xmlFree(typeKey);
-          
-          xmlChar* mapIdKey = xmlGetProp(mapNode, (const xmlChar*) "map");
-          if (mapIdKey != 0)
-          {
-            mapId = atoi((char*) mapIdKey);
-          }
-          xmlFree(mapIdKey);
-          
-          map.setAdjacent(direction, moveType, mapId);
         }
       }
+
+      maps_.emplace(
+        std::piecewise_construct,
+        std::forward_as_tuple(mapId),
+        std::forward_as_tuple(
+          mapId,
+          std::move(mapTiles),
+          std::move(mapTitle)));
     }
   }
-  
-  xmlFreeDoc(doc);
-}
 
-const Map& World::getMap(int id) const
-{
-  return maps.at(id);
-}
-
-const Map& World::getStartingMap() const
-{
-  return maps.at(startMap);
-}
-
-std::pair<int, int> World::getStartingPosition() const
-{
-  return std::make_pair(startX, startY);
+  xmlFreeDoc(doc);
 }
@@ -1,21 +1,41 @@
-#ifndef WORLD_H
-#define WORLD_H
+#ifndef WORLD_H_153C698B
+#define WORLD_H_153C698B
 
 #include <map>
+#include <string>
 #include "map.h"
 
 class World {
-  public:
-    World(const char* filename);
-    const Map& getMap(int id) const;
-    const Map& getStartingMap() const;
-    std::pair<int, int> getStartingPosition() const;
-    
-  private:
-    std::map<int, Map> maps;
-    int startMap;
-    int startX;
-    int startY;
+public:
+
+  explicit World(std::string filename);
+
+  inline const Map& getMap(size_t id) const
+  {
+    return maps_.at(id);
+  }
+
+  inline size_t getStartingMapId() const
+  {
+    return startMap_;
+  }
+
+  inline int getStartingX() const
+  {
+    return startX_;
+  }
+
+  inline int getStartingY() const
+  {
+    return startY_;
+  }
+
+private:
+
+  std::map<size_t, Map> maps_;
+  size_t startMap_;
+  int startX_;
+  int startY_;
 };
 
-#endif /* end of include guard: WORLD_H */
+#endif /* end of include guard: WORLD_H_153C698B */