Fixing .gitignore

Adding engine module for engine dispatching.
Current features:
  - Runs up to a certain framerate (doing nothing)
  - Defines mouse/keyboard events (need mouse_drag, mouse_move?)
  - Defines a mapping scheme between raw keyboard input and an enumeration of key identities
    - Discards any unmapped keyboard input
  - Abstract scene type, represents an interactable system.
  - Typedefs/bindings for time points. Including FPS literals
  - game_dispatch provides the following features
    - Maps mouse/keyboard into local-world in order to abstract the bindings/screen size away
    - throttles framerate with sleep if it goes faster than the 'minimum_frame_duration' variable.

.gitignore

@@ -1 +1 @@
-.*_tc.cpp
+*_tc.cpp

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engine/engine_fwd.hpp

@@ -0,0 +1,29 @@
+//
+//  engine_fwd.hpp
+//  engine
+//
+//  Created by Sam Jaffe on 9/2/16.
+//
+
+#pragma once
+
+#include <string>
+#include <unordered_map>
+
+namespace engine {
+  using raw_key_t = int;
+  using key_enum_t = int;
+  using scene_id_t = std::string;
+  
+  using key_binding = std::unordered_map<raw_key_t, key_enum_t>;
+
+  class game_dispatch;
+  class scene;
+  
+  namespace event {
+    struct key_event;
+    struct mouse_event;
+  }
+  
+  struct tick;
+}

engine/events.cpp

@@ -0,0 +1,8 @@
+//
+//  events.cpp
+//  engine
+//
+//  Created by Sam Jaffe on 9/2/16.
+//
+
+#include "events.hpp"

engine/events.hpp

@@ -0,0 +1,50 @@
+//
+//  events.hpp
+//  engine
+//
+//  Created by Sam Jaffe on 9/2/16.
+//
+
+#pragma once
+
+#include "engine_fwd.hpp"
+#include "math/math_fwd.hpp"
+#include "math/vector.hpp"
+
+namespace engine {
+  namespace key {
+    enum default_keys : key_enum_t {
+      FORWARD,
+      LEFT,
+      BACKWARD,
+      RIGHT,
+      JUMP,
+      CROUCH,
+      INTERACT,
+      QUIT
+    };
+  }
+  
+  namespace event {
+    enum event_type {
+      PRESSED_MASK   = 0x1,
+      RELEASED_MASK  = 0x2,
+      KEY_MASK       = 0x4,
+      MOUSE_MASK     = 0x8,
+      KEY_PRESSED    = KEY_MASK   | PRESSED_MASK ,
+      KEY_RELEASED   = KEY_MASK   | RELEASED_MASK,
+      MOUSE_PRESSED  = MOUSE_MASK | PRESSED_MASK ,
+      MOUSE_RELEASED = MOUSE_MASK | RELEASED_MASK
+    };
+    
+    struct key_event {
+      key_enum_t key;
+      event_type type;
+    };
+    
+    struct mouse_event {
+      math::vec2 current_mouse_position;
+      event_type type;
+    };
+  }
+}

engine/game_dispatch.cpp

@@ -0,0 +1,93 @@
+//
+//  game_dispatch.cpp
+//  gameutils
+//
+//  Created by Sam Jaffe on 9/2/16.
+//
+
+#include <thread>
+
+#include "game_dispatch.hpp"
+
+#include "events.hpp"
+#include "scene.hpp"
+
+namespace engine {
+  namespace {
+    event::event_type mask( event::event_type t, bool pressed ) {
+      return static_cast<event::event_type>( t | ( pressed ? event::PRESSED_MASK : event::RELEASED_MASK ) );
+    }
+  }
+  
+  game_dispatch::game_dispatch( )
+  : screen_size( { 1920.f, 1080.f } )
+  , minimum_frame_duration( engine::FPS60 )
+  , scenes( )
+  , current_timestamp( clock::now( ) )
+  , curr_scene( ) {
+    
+  }
+  
+  game_dispatch::current_scene_info::current_scene_info( ) {
+    
+  }
+  
+  game_dispatch::current_scene_info::current_scene_info( scene * curr )
+  : ptr( curr )
+  , current_scene_id( ptr->id )
+  , local_size( ptr->get_size( ) ) {
+    
+  }
+  
+  void game_dispatch::process_key_event( raw_key_t key, bool press ) {
+    if ( ! curr_scene.is_keyboard_event ) return;
+    auto const & binding = curr_scene.ptr->get_binding( );
+    auto it = binding.find( key );
+    if ( it == binding.end( ) ) return;
+
+    curr_scene.ptr->handle_key_event( {
+      it->second,
+      mask( event::KEY_MASK, press )
+    } );
+  }
+  
+  void game_dispatch::process_mouse_event( math::vec2 mouse_pos, bool press ) {
+    if ( ! curr_scene.is_mouse_event ) return;
+    math::vec2 local_scene_position = mouse_pos * curr_scene.local_size / screen_size;
+
+    curr_scene.ptr->handle_mouse_event( {
+      local_scene_position,
+      mask( event::MOUSE_MASK, press )
+    } );
+  }
+  
+  tick game_dispatch::get_tick( ) {
+    timestamp now = clock::now( );
+    return { now, now - current_timestamp };
+  }
+  
+  tick game_dispatch::next_frame( ) {
+    tick t = get_tick( );
+    
+    while ( t.since < minimum_frame_duration ) {
+      std::this_thread::sleep_for( minimum_frame_duration - t.since );
+      t = get_tick( );
+    }
+    
+    current_timestamp = t.now;
+    return t;
+  }
+  
+  void game_dispatch::gameloop( ) try {
+    while ( running ) { single_frame( next_frame( ) ); }
+    cleanup_resources( );
+    exit( EXIT_SUCCESS );
+  } catch ( std::exception const & ex ) {
+    // todo: logging
+    exit( EXIT_FAILURE );
+  }
+  
+  void game_dispatch::quit( ) {
+    running = false;
+  }
+}

engine/game_dispatch.hpp

@@ -0,0 +1,56 @@
+//
+//  game_dispatch.hpp
+//  gameutils
+//
+//  Created by Sam Jaffe on 9/2/16.
+//
+
+#pragma once
+
+#include <chrono>
+#include <memory>
+#include <unordered_map>
+
+#include "time.hpp"
+#include "engine_fwd.hpp"
+#include "events.hpp"
+#include "math/math_fwd.hpp"
+#include "math/vector.hpp"
+
+namespace engine {
+  class game_dispatch {
+  public:
+    game_dispatch( );
+    
+    void process_key_event( raw_key_t key, bool press );
+    void process_mouse_event( math::vec2 click, bool press );
+    
+    [[noreturn]] void gameloop( );
+    void quit( );
+  private:
+    void single_frame( tick t ) { }
+    tick get_tick( );
+    tick next_frame( );
+    void cleanup_resources( ) { } // TODO ???
+  private:
+    math::vec2 screen_size;
+    duration minimum_frame_duration;
+
+    using scene_t = std::unique_ptr<scene>;
+    std::unordered_map<scene_id_t, scene_t> scenes;
+    
+    bool running = true;
+    timestamp current_timestamp;
+    struct current_scene_info {
+      current_scene_info( );
+      current_scene_info( scene * );
+      
+      scene * ptr; // weak
+      
+      std::string current_scene_id; // metadata
+      math::vec2 local_size; // metadata
+      bool is_mouse_event;
+      bool is_keyboard_event;
+    } curr_scene;
+  };
+}

engine/scene.cpp

@@ -0,0 +1,44 @@
+//
+//  scene.cpp
+//  engine
+//
+//  Created by Sam Jaffe on 9/2/16.
+//
+
+#include "scene.hpp"
+
+#include "events.hpp"
+#include "game_dispatch.hpp"
+
+namespace engine {
+  
+  
+  scene::~scene( ) { }
+  
+  void scene::update( tick ) {
+    
+  }
+  
+  void scene::render( ) {
+    
+  }
+  
+  void scene::handle_key_event( event::key_event evt ) {
+    if ( evt.type & event::PRESSED_MASK &&
+        evt.key == key::QUIT ) {
+      dispatch.lock()->quit( );
+    }
+  }
+  
+  void scene::handle_mouse_event( event::mouse_event evt ) {
+    
+  }
+  
+  math::vec2 scene::get_size( ) const {
+    return local_scene_dimension;
+  }
+  
+  key_binding const & scene::get_binding( ) const {
+    return keys;
+  }
+}

engine/scene.hpp

@@ -0,0 +1,37 @@
+//
+//  scene.hpp
+//  engine
+//
+//  Created by Sam Jaffe on 9/2/16.
+//
+
+#pragma once
+
+#include <memory>
+
+#include "engine_fwd.hpp"
+#include "math/math_fwd.hpp"
+#include "math/vector.hpp"
+#include "util/identity.hpp"
+
+namespace engine {  
+  class scene : public identity<scene, std::string> {
+  public:
+    using identity<scene, std::string>::identity;
+    virtual ~scene( );
+    
+    virtual void update( tick );
+    virtual void render( );
+    virtual void handle_key_event( event::key_event evt );
+    virtual void handle_mouse_event( event::mouse_event evt );
+    
+    math::vec2 get_size( ) const;
+    key_binding const & get_binding( ) const;
+  protected:
+    void change_scene( std::string const & scene_id );
+  private:
+    math::vec2 local_scene_dimension;
+    key_binding keys;
+    std::weak_ptr<game_dispatch> dispatch;
+  };
+}

engine/time.cpp

@@ -0,0 +1,18 @@
+//
+//  time.cpp
+//  engine
+//
+//  Created by Sam Jaffe on 9/3/16.
+//
+
+#include "time.hpp"
+
+namespace engine {
+  using std::chrono::duration_cast;
+  using std::chrono::nanoseconds;
+  
+  duration const FPS30 { nanoseconds{ 33333333 } };
+  duration const FPS60 { nanoseconds{ 16666666 } };
+  duration const FPS120{ nanoseconds{  8333333 } };
+  duration const FPS144{ nanoseconds{  6944444 } };
+}

engine/time.hpp

@@ -0,0 +1,26 @@
+//
+//  time.hpp
+//  engine
+//
+//  Created by Sam Jaffe on 9/3/16.
+//
+
+#pragma once
+
+#include <chrono>
+
+namespace engine {
+  using clock = std::chrono::steady_clock;
+  using timestamp = std::chrono::time_point<clock>;
+  using duration = clock::duration;
+  
+  extern duration const FPS30;
+  extern duration const FPS60;
+  extern duration const FPS120;
+  extern duration const FPS144;
+  
+  struct tick {
+    timestamp now;
+    duration since;
+  };  
+}

game.xcworkspace/contents.xcworkspacedata

@@ -1,6 +1,9 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Workspace
    version = "1.0">
+   <FileRef
+      location = "group:engine/engine.xcodeproj">
+   </FileRef>
    <FileRef
       location = "group:util/gameutils.xcodeproj">
    </FileRef>