Add basic AABB collision detection

src/include/Dengine/Entity.h

@@ -31,11 +31,24 @@ typedef struct Entity
 	v2 size;
 	enum Direction direction;
 	Texture *tex;
+	b32 collides;
 
 	// TODO(doyle): String based access
 	SpriteAnim anim[16];
 	i32 freeAnimIndex;
 	i32 currAnimIndex;
+
 } Entity;
 
+INTERNAL inline v4 getEntityScreenRect(Entity entity)
+{
+	v2 entityUpperLeftBound  = v2_add(entity.pos, V2(0.0f, entity.size.y));
+	v2 entityLowerRightBound = v2_add(entity.pos, V2(entity.size.x, 0.0f));
+
+	v4 result = V4(entityUpperLeftBound.x, entityUpperLeftBound.y,
+	               entityLowerRightBound.x, entityLowerRightBound.y);
+
+	return result;
+}
+
 #endif