Add basic input system

game/game_state.h

@@ -19,7 +19,7 @@ typedef struct InputState {
     MouseButton RMB;
     MouseButton MMB;
     KeyboardKey ESC;
-    f32 DRAG_LIMIT;
+    f32 CLICK_LIMIT;
     // Common
     Vector2 mouseDown;
     Vector2 mouseDownWorld;
@@ -30,7 +30,8 @@ typedef struct InputState {
     TilePosition buildingPos;
     TileSize buildingSize;
     // SELECTED_UNITS
-    // SELECTED_OBJECTS
+    ecs_entity_t *entities;
+    // SELECTED_OBJECT
     // SELECTED_BUILDING
 } InputState;
 
@@ -43,7 +44,6 @@ typedef struct Game {
     BzSpatialGrid *entityGrid;
     f32 frameDuration;
     ecs_entity_t entity;
-    InputState input;
     struct {
         i64 wood;
         i64 iron;
@@ -66,5 +66,6 @@ typedef struct Game {
 extern ecs_world_t *ECS;
 
 extern ECS_COMPONENT_DECLARE(Game);
+extern ECS_COMPONENT_DECLARE(InputState);
 
 #endif //PIXELDEFENSE_GAME_STATE_H