tile.hpp as of 2024-04-26

#ifndef _TILE_HPP
#define _TILE_HPP

#include <globals.hpp>





union Tile {
  kit::u16 value;

  struct {
    kit::u16        id : 7; //id of what tile to use

    kit::u16   tileset : 1; //whether to use tileset a or b

    kit::u16 collide_a : 1; //'collide with top-left 12x12 section of tile?'
    kit::u16 collide_b : 1; //'collide with top-right 12x12 section of tile?'
    kit::u16 collide_c : 1; //'collide with bottom-left 12x12 section of tile?'
    kit::u16 collide_d : 1; //'collide with bottom-right 12x12 section of tile?'

    kit::u16      pass : 1; //allow passing through tile
    kit::u16  platform : 1; //allow falling through top side of tile conditionally

    kit::u16   _unused : 2;
  };

  Tile(               ) : value(             0) {}
  Tile(kit::u8 _lobyte) : value(0x0f00|_lobyte) {} //assumes full collision
  Tile(kit::u16 _value) : value(        _value) {}
  Tile(kit::s32 _value) : value(0xffff& _value) {}
};





struct Object;
struct Scene;

typedef void (*Object_TickCallback)(Object* obj_a, Scene* scene);

struct Object { //32B
  kit::u16                  type;
  kit::u16                    _0;
  kit::s16                     x;
  kit::s16                     y;
  Object_TickCallback funcUpdate;
  kit::u64                    _1;
};





//uncompressed scene data
struct Scene { //64B
  //pat is memory::alloc'd, bmp uses "new" instead
  kit::Bitmap* bmp_bg = nullptr; //bitmap for background layer
  Tile*        pat_mg = nullptr; //pattern for midground (collision) layer
  Tile*        pat_fg = nullptr; //pattern for foreground layer (skipped if nullptr)
  //(length of pat_<mg/fg> is [TILESIZ_X*TILESIZ_Y])

  //these two are memory::alloc'd too
  Object*  objs          = nullptr; //pointer to associated object array,
  Object*  objs_original = nullptr;  //and whatever its original state was
  kit::u16 objs_len      = 0;

  //associated edges can be manipulated by game states
  kit::u16   edge_n; //scene id for north edge
  kit::u16   edge_s; //scene id for south edge
  kit::u16   edge_w; //scene id for west edge
  kit::u16   edge_e; //scene id for east edge
  kit::u16 scene_id; //scene id for scene itself

  kit::u16     music = 0; //music id;  0 for no change, -1 (65535) to stop
  kit::u16 ambient_a = 0; //ambient track id a;  0 for no change, -1 to stop
  kit::u16 ambient_b = 0; //ambient track id b;  0 for no change, -1 to stop

  kit::u16     tileset_a = 0; //1st associated tileset
  kit::u16     tileset_b = 0; //2nd associated tileset
  kit::u8 visited_before = 0; //used to reset object (including npc) properties between deaths
  bool        stretch_bg = true; //'stretch the bg over the entire screen?' (repeats otherwise)


  void drawBg();

  void drawTiles(bool drawForeground = false); //draws midground if false
};





#endif /* _TILE_HPP */