/**
  Raycasting demo 3 for Pokitto.

  Minecraft-like demo, shows an interactive terrain editing and raycasting
  without textures.

  Don't forget to compile with -O3!

  author: Miloslav "drummyfish" Ciz
  license: CC0 1.0
*/

#define SUBSAMPLE 1

#define PLAYER_SPEED (RCL_UNITS_PER_SQUARE * 4 * SPEED_MULTIPLIER)
#define PLAYER_JUMP_SPEED 600
#define RCL_HORIZONTAL_FOV ((3 * RCL_UNITS_PER_SQUARE) / 10)
#define GRAVITY_ACCELERATION (RCL_UNITS_PER_SQUARE * 2 * SPEED_MULTIPLIER)
#define RCL_CAMERA_COLL_HEIGHT_BELOW ((3 * RCL_UNITS_PER_SQUARE) / 2)
#define FPS 255
#define HEAD_BOB_HEIGHT 150
#define HEAD_BOB_STEP 20

#define RCL_COMPUTE_WALL_TEXCOORDS 0 // we won't be using textures, so turn them off
#define RCL_COMPUTE_CEILING_DEPTH 0  // again, we don't need ceiling depth

#define TEXTURE_W 32 // required to define even though we use no textures
#define TEXTURE_H 32

#include "general.hpp"

#define LEVEL_X_RES 29
#define LEVEL_Y_RES 21

Player player;

#define SPRITE_MAX_DISTANCE 5 * RCL_UNITS_PER_SQUARE

#define JUMP_SPEED 500

RCL_Vector2D selectedSquare; ///< Coords of a square selected for editing.

/**
  Represents one terrain change against the implicit terrain.
*/
class Change
{
public:
  RCL_Vector2D mCoords;
  RCL_Unit mHeight;
  int8_t mColor;
};

#define MAX_CHANGES 16 ///< Maximum number of simultaneous terrain changes.

Change changes[MAX_CHANGES]; ///< Terrain change list.

// helpers
bool editReleased = false;
bool editing = false;
uint16_t changeIndex = 0;
int16_t editCounter = 0;

#define SQUARE_COLORS 4
const uint8_t squareColors[SQUARE_COLORS] =
  { HUE(10), HUE(8), HUE(14), HUE(15) };

#define FLOOR_COLORS 8
const uint8_t floorColors[FLOOR_COLORS] =
  { HUE(2), HUE(3), HUE(10), HUE(11), HUE(1), HUE(5), HUE(6), HUE(14) };

#define HEIGHT_PROFILE_LENGTH 256

/// Script-generated 1D terrain height profile, used for terrain generation.
const int8_t heightProfile[] =
{
  9,9,9,10,10,10,11,11,12,13,13,14,14,14,15,15,15,16,16,16,16,16,15,15,15,14,14,
  13,13,12,11,10,10,9,9,9,8,8,8,8,8,8,7,7,7,6,5,4,4,3,3,3,3,3,3,4,5,7,8,10,11,12,
  12,13,13,13,14,16,19,20,21,21,22,22,22,23,23,23,23,22,22,21,20,19,18,18,17,17,
  17,17,16,16,16,16,16,16,16,15,15,15,14,14,13,12,11,10,8,7,6,5,5,5,4,4,4,4,4,5,
  5,5,6,6,7,7,7,8,8,8,8,8,8,8,7,7,7,7,6,6,5,4,4,3,2,2,2,1,1,1,1,2,3,5,6,7,9,13,
  13,13,18,18,22,22,22,22,22,22,21,21,20,20,19,16,16,16,14,14,14,15,15,15,15,15,
  16,17,17,18,18,18,16,16,16,16,15,15,15,14,14,13,12,8,7,7,7,8,9,11,12,12,13,13,
  13,12,11,10,10,10,10,11,11,12,13,13,12,12,11,11,10,10,9,9,9,9,9,9,10,10,11,12,
  13,13,14,14,14,14,14,13,13,12,11,11,11,11,10,10,10,10
};

const unsigned char imageBackground[] =
{  110, 44 // width, height
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  ,0x0f,0x0f,0x0f,0x2f,0x2f,0xdd,0xdd,0xda,0xdd,0xda,0x38,0xac,0xac,0xac
  ,0xac,0xac,0xac,0xac,0xac,0xac,0x7f,0x7f,0x7f,0x7f,0x7f,0x7f,0x7d,0x7f
  ,0x7d,0x7d,0x7d,0x7d,0x6c,0x6c,0x6c,0x6c,0xee,0x6c,0xee,0xee,0xee,0xee
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  ,0xac,0xac,0xac,0xac,0xac,0xac,0xac,0xac,0x7f,0x7f,0x7f,0x7f,0x7f,0x7f
  ,0x7f,0x7d,0x7d,0x7d,0x7d,0x6c,0x7d,0x6c,0x6c,0x6c,0x6c,0xee,0xee,0xee
  ,0xee,0x0f,0x0f,0x0f,0x0f,0x0f,0x0f,0x2f,0x2f,0x2f,0xdd,0xda,0xdd,0xda
  ,0x38,0xad,0xac,0xad,0xac,0xad,0xac,0xad,0xac,0xad,0x7f,0x7f,0x7f,0x7f
  ,0x7f,0x7f,0x7d,0x7f,0x7d,0x7d,0x7d,0x7d,0x6c,0x6c,0x6c,0x6c,0xee,0x6c
  ,0xee,0xee,0xee,0x0f,0x0f,0x0f,0x0f,0x0f,0x0f,0x0f,0x2f,0x2f,0x08,0xdd
  ,0xda,0xda,0xda,0xac,0xad,0xac,0xad,0xac,0xad,0xac,0xad,0xac,0x7f,0x7f
  ,0x7f,0x7f,0x7f,0x7f,0x7f,0x7d,0x7d,0x7d,0x7d,0x6c,0x7d,0x6c,0x6c,0x6c
  ,0x6c,0xee,0xee,0xee,0x0f,0x0f,0x0f,0x0f,0x0f,0x0f,0x0f,0x0f,0x2f,0x2f
  ,0x08,0xda,0xdd,0xda,0xda,0xad,0xad,0xad,0xad,0xad,0xad,0xad,0xad,0xad
  ,0x7f,0x7f,0x7f,0x7f,0x7f,0x7f,0x7d,0x7f,0x7d,0x7d,0x7d,0x7d,0x6c,0x6c
  ,0x6c,0x6c,0xee,0x6c,0xee,0xee,0x0f,0x0f,0x0f,0x0f,0x0f,0x0f,0x0f,0x0f
  ,0x2f,0x2f,0x2f,0xdd,0xda,0xda,0xda,0xad,0xae,0xad,0xae,0xad,0xae,0xad
  ,0xae,0xad,0x7f,0x7f,0x7f,0x7f,0x7f,0x7f,0x7f,0x7d,0x7d,0x7d,0x7d,0x6c
  ,0x7d,0x6c,0x6c,0x6c,0x6c,0xee,0xee,0xee,0x0f,0x0f,0x0f,0x0f,0x0f,0x0f
  ,0x0f,0x0f,0x2f,0x2f,0x2f,0xda,0xdd,0xda,0xda,0xae,0xad,0xae,0xad,0xae
  ,0xad,0xae,0xad,0xae,0x7f,0x7f,0x7f,0x7f,0x7f,0x7f,0x7d,0x7f,0x7d,0x7d
  ,0x7d,0x7d,0x6c,0x6c,0x6c,0x6c,0xee,0x6c,0xee,0xee,0x0f,0x0f,0x0f,0x0f
  ,0x0f,0x0f,0x0f,0x0f,0x2f,0x2f,0x2f,0xdd,0xda,0xda,0xda,0xae,0xae,0xae
  ,0xae,0xae,0xae,0xae,0xae,0xae,0x7f,0x7f,0x7f,0x7f,0x7f,0x7f,0x7f,0x7d
  ,0x7d,0x7d,0x7d,0x6c,0x7d,0x6c,0x6c,0x6c,0x6c,0xee,0xee,0x0f,0x0f,0x0f
  ,0xee,0x0f,0x0f,0x0f,0x0f,0x0f,0x0f,0x2f,0x2f,0xda,0xdd,0xda,0xda,0x38
  ,0xae,0xaf,0xae,0xaf,0xae,0xaf,0xae,0xaf,0x7f,0x7f,0x7f,0x7f,0x7f,0x7f
  ,0x7d,0x7f,0x7d,0x7d,0x7d,0x7d,0x6c,0x6c,0x6c,0x6c,0xee,0x6c,0xee,0x0f
  ,0x0f,0x0f,0xec,0x0f,0x0f,0x0f,0x0f,0x0f,0x0f,0x2f,0x2f,0xdd,0xda,0xda
  ,0xda,0x38,0xaf,0xae,0xaf,0xae,0xaf,0xae,0xaf,0xae,0x7f,0x7f,0x7f,0x7f
  ,0x7f,0x7f,0x7f,0x7d,0x7d,0x7d,0x7d,0x6c,0x7d,0x6c,0x6c,0x6c,0x6c,0xee
  ,0xee,0x0f,0x0f,0xec,0xee,0x0f,0x0f,0x0f,0x0f,0x0f,0x0f,0x2f,0x2f,0xda
  ,0xdd,0xda,0xda,0x38,0xaf,0xaf,0xaf,0xaf,0xaf,0xaf,0xaf,0xaf,0x7f,0x7f
  ,0x7f,0x7f,0x7f,0x7f,0x7d,0x7f,0x7d,0x7d,0x7d,0x7d,0x6c,0x6c,0x6c,0x6c
  ,0xee,0x6c,0xee,0x0f,0x0f,0xee,0xec,0x0f,0x0f,0x0f,0x0f,0x0f,0x0f,0x2f
  ,0x2f,0xdd,0xda,0xda,0xda,0x38,0xaf,0x2f,0xaf,0x2f,0xaf,0x2f,0xaf,0x2f
  ,0x7f,0x7f,0x7f,0x7f,0x7f,0x7f,0x7f,0x7d,0x7d,0x7d,0x7d,0x6c,0x7d,0x6c
  ,0x6c,0x6c,0x6c,0xee,0xee,0x0f,0x0f,0xec,0xee,0x0f,0x0f,0x0f,0x0f,0x0f
  ,0x0f,0x0f,0x2f,0xda,0xdd,0xda,0xda,0xda,0x2f,0xaf,0x2f,0xaf,0x2f,0xaf
  ,0x2f,0xaf,0x7f,0x7f,0x7f,0x7f,0x7f,0x7f,0x7d,0x7f,0x7d,0x7d,0x7d,0x7d
  ,0x6c,0x6c,0x6c,0x6c,0xee,0x6c,0xee,0xee,0xee,0xee,0xec,0xec,0x0f,0x0f
  ,0x0f,0x0f,0x0f,0x0f,0x2f,0xdd,0xda,0xda,0xda,0xda,0x2f,0x1f,0x2f,0x1f
  ,0x2f,0x1f,0x2f,0x1f,0x7f,0x7f,0x7f,0x7f,0x7f,0x7f,0x7f,0x7d,0x7d,0x7d
  ,0x7d,0x6c,0x7d,0x6c,0x6c,0x6c,0x6c,0xee,0xee,0xee,0xee,0xec,0xee,0xec
  ,0x0f,0x0f,0x0f,0x0f,0x0f,0x0f,0x2f,0xda,0xdd,0xda,0xda,0xda,0xaf,0x2f
  ,0xaf,0x2f,0xaf,0x2f,0xaf,0x2f,0x7f,0x7f,0x7f,0x7f,0x7f,0x7f,0x7d,0x7f
  ,0x7d,0x7d,0x7d,0x7d,0x6c,0x6c,0x6c,0x6c,0xee,0x6c,0xee,0xee,0xee,0xee
  ,0xec,0xec,0x0f,0x0f,0x0f,0x0f,0x0f,0x0f,0x0f,0xdd,0xda,0xda,0xda,0xda
  ,0xda,0xaf,0x2f,0xaf,0x2f,0xaf,0x2f,0xaf,0x7f,0x7f,0x7f,0x7f,0x7f,0x7f
  ,0x7f,0x7d,0x7d,0x7d,0x7d,0x6c,0x7d,0x6c,0x6c,0x6c,0x6c,0xee,0xee,0xee
  ,0xee,0xec,0xee,0xec,0x0f,0x0f,0x0f,0x0f,0x0f,0x0f,0x0f,0xda,0xdd,0xda
  ,0xda,0xda,0xda,0xaf,0xaf,0xaf,0xaf,0xaf,0xaf,0xaf,0x7f,0x7f,0x7f,0x7f
  ,0x7f,0x7f,0x7d,0x7f,0x7d,0x7d,0x7d,0x7d,0x6c,0x6c,0x6c,0x6c,0xee,0x6c
  ,0xee,0xee,0xee,0xee,0xec,0xec,0x0f,0x0f,0x0f,0x0f,0x0f,0x0f,0x0f,0xdd
  ,0xda,0xda,0xda,0xda,0xda,0xaf,0xae,0xaf,0xae,0xaf,0xae,0xaf,0x7f,0x7f
  ,0x7f,0x7f,0x7f,0x7f,0x7f,0x7d,0x7d,0x7d,0x7d,0x6c,0x7d,0x6c,0x6c,0x6c
  ,0x6c,0xee,0xee,0xee,0xee,0xec,0xee,0xec,0x0f,0x0f,0x0f,0x0f,0x0f,0x0f
  ,0x0f,0xda,0xdd,0xda,0xda,0xda,0xda,0xae,0xaf,0xae,0xaf,0xae,0xaf,0xae
  ,0x7f,0x7f,0x7f,0x7f,0x7f,0x7f,0x7d,0x7f,0x7d,0x7d,0x7d,0x7d,0x6c,0x6c
  ,0x6c,0x6c,0xee,0x6c,0xee,0xee,0xee,0xee,0xec,0xec,0x0f,0x0f,0x0f,0x0f
  ,0x0f,0x0f,0x0f,0xdd,0xda,0xda,0xda,0xda,0xda,0xae,0xae,0xae,0xae,0xae
  ,0xae,0xae,0x7f,0x7f,0x7f,0x7f,0x7f,0x7f,0x7f,0x7d,0x7d,0x7d,0x7d,0x6c
  ,0x7d,0x6c,0x6c,0x6c,0x6c,0xee,0xee,0xee,0xee,0xec,0xee,0xec,0x0f,0x0f
  ,0x0f,0x0f,0x0f,0x0f,0x0f,0xda,0xdd,0xda,0xda,0xda,0xda,0x38,0xae,0xad
  ,0xae,0xad,0xae,0xad,0x7f,0x7f,0x7f,0x7f,0x7f,0x7f,0x7d,0x7f,0x7d,0x7d
  ,0x7d,0x7d,0x6c,0x6c,0x6c,0x6c,0xee,0x6c,0xee,0xee,0xee,0xee,0xec,0x0f
  ,0x0f,0x0f,0x0f,0x0f,0x0f,0x0f,0x0f,0xdd,0xda,0xda,0xda,0xda,0xda,0x38
  ,0xad,0xae,0xad,0xae,0xad,0xae,0x7f,0x7f,0x7f,0x7f,0x7f,0x7f,0x7f,0x7d
  ,0x7d,0x7d,0x7d,0x6c,0x7d,0x6c,0x6c,0x6c,0x6c,0xee,0xee,0xee,0xee,0xec
  ,0xee,0x0f,0x0f,0x0f,0x0f,0x0f,0x0f,0x0f,0xdd,0xda,0xdd,0xda,0xda,0xda
  ,0xda,0x38,0xad,0xad,0xad,0xad,0xad,0xad,0x7f,0x7f,0x7f,0x7f,0x7f,0x7f
  ,0x7d,0x7f,0x7d,0x7d,0x7d,0x7d,0x6c,0x6c,0x6c,0x6c,0xee,0x6c,0xee,0xee
  ,0xee,0xee,0xec,0x0f,0x0f,0x0f,0x0f,0x0f,0x0f,0x0f,0xdd,0xdd,0xda,0xda
  ,0xda,0xda,0xda,0x38,0xac,0xad,0xac,0xad,0xac,0xad,0x7f,0x7f,0x7f,0x7f
  ,0x7f,0x7f,0x7f,0x7d,0x7d,0x7d,0x7d,0x6c,0x7d,0x6c,0x6c,0x6c,0x6c,0xee
  ,0xee,0xee,0xee,0xec,0xee,0x0f,0x0f,0x0f,0xdd,0x0f,0x0f,0x0f,0xdd,0xda
  ,0xdd,0xda,0xda,0xda,0xda,0x38,0xad,0xac,0xad,0xac,0xad,0xac,0x7f,0x7f
  ,0x7f,0x7f,0x7f,0x7f,0x7d,0x7f,0x7d,0x7d,0x7d,0x7d,0x6c,0x6c,0x6c,0x6c
  ,0xee,0x6c,0xee,0xee,0xee,0xee,0x0f,0x0f,0x0f,0x0f,0xec,0x0f,0x0f,0x0f
  ,0xdd,0xdd,0xda,0xda,0xda,0xda,0xda,0x38,0xac,0xac,0xac,0xac,0xac,0xac
  ,0x7f,0x7f,0x7f,0x7f,0x7f,0x7f,0x7f,0x7d,0x7d,0x7d,0x7d,0x6c,0x7d,0x6c
  ,0x6c,0x6c,0x6c,0xee,0xee,0xee,0xee,0xec,0x0f,0x0f,0x0f,0x0f,0xdd,0x0f
  ,0x0f,0x0f,0xdd,0xda,0xdd,0xda,0xda,0xda,0xda,0x38,0xac,0xab,0xac,0xab
  ,0xac,0xab,0x7f,0x7f,0x7f,0x7f,0x7f,0x7f,0x7d,0x7f,0x7d,0x7d,0x7d,0x7d
  ,0x6c,0x6c,0x6c,0x6c,0xee,0x6c,0xee,0xee,0xee,0xee,0x0f,0x0f,0x0f,0x0f
  ,0xec,0x0f,0x0f,0x0f,0xdd,0xdd,0xda,0xda,0xda,0xda,0xda,0x38,0xab,0xac
  ,0xab,0xac,0xab,0xac,0x7f,0x7f,0x7f,0x7f,0x7f,0x7f,0x7f,0x7d,0x7d,0x7d
  ,0x7d,0x6c,0x7d,0x6c,0x6c,0x6c,0x6c,0xee,0xee,0xee,0xee,0xec,0x0f,0x0f
  ,0x0f,0x0f,0xdd,0xec,0x0f,0x0f,0xdd,0xda,0xdd,0xda,0xda,0xda,0xda,0xab
  ,0xab,0xab,0xab,0xab,0xab,0xab,0x7f,0x7f,0x7f,0x7f,0x7f,0x7f,0x7d,0x7f
  ,0x7d,0x7d,0x7d,0x7d,0x6c,0x6c,0x6c,0x6c,0xee,0x6c,0xee,0xee,0xee,0xee
  ,0x0f,0x0f,0x0f,0x0f,0xec,0xdd,0x0f,0x0f,0xdd,0xdd,0xda,0xda,0xda,0xda
  ,0xda,0xab,0xaa,0xab,0xaa,0xab,0xaa,0xab,0x7f,0x7f,0x7f,0x7f,0x7f,0x7f
  ,0x7f,0x7d,0x7d,0x7d,0x7d,0x6c,0x7d,0x6c,0x6c,0x6c,0x6c,0xee,0xee,0xee
  ,0xee,0xec,0x0f,0x0f,0x0f,0x0f,0xdd,0xec,0x0f,0xda,0xdd,0xda,0xdd,0xda
  ,0xda,0xda,0xda,0xaa,0xab,0xaa,0xab,0xaa,0xab,0xaa,0x7f,0x7f,0x7f,0x7f
  ,0x7f,0x7f,0x7d,0x7f,0x7d,0x7d,0x7d,0x7d,0x6c,0x6c,0x6c,0x6c,0xee,0x6c
  ,0xee,0xee,0xee,0xee,0xec,0x0f,0x0f,0x0f,0xec,0xdd,0xdd,0xdd,0xdd,0xdd
  ,0xda,0xda,0xda,0xda,0x38,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0x7f,0x7f
  ,0x7f,0x2f,0x7f,0x7f,0x7f,0x7d,0x7d,0x7d,0x7d,0x6c,0x7d,0x6c,0x6c,0x6c
  ,0x6c,0xee,0xee,0xee,0xee,0xec,0xee,0x0f,0x0f,0x0f,0xdd,0xec,0xdd,0xda
  ,0xdd,0xda,0xdd,0xda,0xda,0xda,0x38,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa
  ,0x7f,0x7f,0x2f,0x2f,0x7f,0x7f,0x7d,0x7f,0x7d,0x7d,0x7d,0x7d,0x6c,0x6c
  ,0x6c,0x6c,0xee,0x6c,0xee,0xee,0xee,0xee,0xec,0xec,0x0f,0x0f,0xec,0xdd
  ,0xdd,0xdd,0xdd,0xdd,0xda,0xda,0xda,0xda,0x38,0xa9,0xaa,0xa9,0xaa,0xa9
  ,0xaa,0xa9,0x7f,0x7f,0x2f,0x2f,0x2f,0x7f,0x7f,0x7d,0x7d,0x7d,0x7d,0x6c
  ,0x0f,0x6c,0x6c,0x6c,0x6c,0xee,0xee,0xee,0xee,0xec,0xee,0xec,0x0f,0x0f
  ,0xdd,0xec,0xdd,0xda,0xdd,0xda,0xdd,0xda,0xda,0xda,0xa9,0xaa,0xa9,0xaa
  ,0xa9,0xaa,0xa9,0xaa,0x7f,0x2f,0x2f,0x2f,0x2f,0x2f,0x7d,0x7f,0x7d,0x7d
  ,0x7d,0x0f,0x0f,0x2f,0x6c,0x6c,0xee,0x6c,0xee,0xee,0xee,0xee,0xec,0xec
  ,0x0f,0xec,0xec,0xdd,0xdd,0xdd,0xdd,0xdd,0xda,0xda,0xda,0xda,0xa9,0xa9
  ,0xa9,0xa9,0xa9,0xa9,0xa9,0xa9,0x7f,0x2f,0x0f,0x0f,0x2f,0x2f,0x7f,0x7d
  ,0x7d,0x7d,0x7d,0x0f,0x0f,0x2f,0x6c,0x6c,0x6c,0xee,0xee,0xee,0xee,0xec
  ,0xee,0xec,0xec,0xec,0xdd,0xec,0xdd,0xda,0xdd,0xda,0xdd,0xda,0xda,0x38
  ,0xa9,0xa9,0xa9,0xa9,0xa9,0xa9,0xa9,0xa9,0x7f,0x0f,0x0f,0x0f,0x2f,0x2f
  ,0x2f,0x7f,0x7d,0x7d,0x7d,0x0f,0x2f,0x2f,0x6c,0x6c,0xee,0x6c,0xee,0xee
  ,0xee,0xee,0xec,0xec,0xec,0xec,0xec,0xdd,0xdd,0xdd,0xdd,0xdd,0xda,0xda
  ,0xda,0x38,0xa9,0xa9,0xa9,0xa9,0xa9,0xa9,0xa9,0xa9
};

RCL_Unit floorHeightAt(int16_t x, int16_t y)
{
  /*
    This for loop may become a bottleneck, since this function is called
    very often - if more changes are to be kept, optimizations are needed -
    probably a hash table, sorting by coordinates etc.

    Maybe the better option yet would be to generate the terrain around the
    player into an array and pull values from there.
  */
  for (uint16_t i = 0; i < MAX_CHANGES; ++i)
    if (changes[i].mCoords.x == x && changes[i].mCoords.y == y)
      return changes[i].mHeight;

  return (heightProfile[RCL_absVal(x) % HEIGHT_PROFILE_LENGTH] +
         heightProfile[RCL_absVal(y + 20) % HEIGHT_PROFILE_LENGTH]) *
         RCL_UNITS_PER_SQUARE;
}

RCL_Unit colorAt(int16_t x, int16_t y)
{
  for (uint16_t i = 0; i < MAX_CHANGES; ++i)
    if (changes[i].mCoords.x == x && changes[i].mCoords.y == y)
      return changes[i].mColor;

  return min((heightProfile[RCL_absVal(x * 2) % HEIGHT_PROFILE_LENGTH] +
         heightProfile[RCL_absVal(y) % HEIGHT_PROFILE_LENGTH]) / 10,3);
}

uint16_t previousColumn = 255; ///< Helper for precomputing background.
uint16_t backgroundColumn = 0; ///< Precomputed background column.

/**
  Function for drawing a single pixel (like fragment shader).
*/
inline void pixelFunc(RCL_PixelInfo *pixel)
{
  uint8_t color = 0;
  uint8_t intensity = 0;

  if (pixel->isWall)
  {
    if (pixel->hit.square.x != selectedSquare.x || pixel->hit.square.y != selectedSquare.y || (editing && pokitto.frameCount % 2) == 0)
    {
      intensity = pixel->depth / (RCL_UNITS_PER_SQUARE * 2) +
      ((pixel->hit.direction == 0 || pixel->hit.direction == 2) ? 4 : 0);

      color = plusIntensity(squareColors[pixel->hit.type],intensity);
    }
    else
      color = 30;
  }
  else if (pixel->isFloor)
  {
    if (!pixel->isHorizon)
    {
      intensity = pixel->depth / RCL_UNITS_PER_SQUARE;
      color = plusIntensity(floorColors[(pixel->height / RCL_UNITS_PER_SQUARE) % FLOOR_COLORS],intensity);
    }
    else
      color = floorColors[0];
  }
  else
  {
    if (previousColumn != pixel->position.x)
    {
      backgroundColumn = RCL_absVal(pixel->position.x + (110 * player.mCamera.direction) / RCL_UNITS_PER_SQUARE) % 110;
      previousColumn = pixel->position.x;
    }
    
    color = imageBackground[2 + backgroundColumn * 44 + RCL_clamp(pixel->position.y - player.mCamera.shear,0,43)];
  }

  putSubsampledPixel(pixel->position.x,pixel->position.y,color);
}

bool flyBy = true;

void draw()
{
  player.mCamera.height += player.mHeadBob;
  RCL_renderComplex(player.mCamera,floorHeightAt,0,colorAt,defaultConstraints);
  player.mCamera.height -= player.mHeadBob;

  if (flyBy && (pokitto.frameCount >> 3) % 3 != 0)
  {
    pokitto.display.setColor(0);
    pokitto.display.fillRect(22,3,66,10);
    pokitto.display.setCursor(25,5);
    pokitto.display.setColor(47);
    pokitto.display.invisiblecolor = 0;
    pokitto.display.print("press any key");
  }
}

void cameraFlyBy(uint32_t dt)
{
  RCL_Unit height = floorHeightAt(
    RCL_divRoundDown(player.mCamera.position.x,RCL_UNITS_PER_SQUARE),
    RCL_divRoundDown(player.mCamera.position.y,RCL_UNITS_PER_SQUARE)) + RCL_UNITS_PER_SQUARE * 3;

  RCL_Unit heightDiff = player.mCamera.height - height;

  RCL_Unit step = (200 * dt) / 1000;

  if (heightDiff > RCL_UNITS_PER_SQUARE * 2)
  {
    player.mCamera.height -= step * heightDiff / 200;
    player.mCamera.shear = max(player.mCamera.shear - 1,-80);
  }
  else
  {
    if (heightDiff < RCL_UNITS_PER_SQUARE)
      player.mCamera.height += step * RCL_absVal(heightDiff / 70);

    if (player.mCamera.shear < 0 && pokitto.frameCount % 2 == 0)
      player.mCamera.shear++;
  }

  player.mCamera.position.x += step * 30;
  player.mCamera.position.y += step * 15;
  player.mCamera.direction = RCL_sinInt(pokitto.frameCount / 8);
}

int main()
{
  initGeneral();

  defaultConstraints.maxHits = 6;
  defaultConstraints.maxSteps = 20;

  player.setPositionSquare(4,5);
  player.mCamera.height = floorHeightAt(4,5);

  // init changes

  for (uint16_t i = 0; i < MAX_CHANGES; ++i)
  {
    changes[i].mCoords.x = (i + 1) * 1000;
    changes[i].mCoords.y = 0;
    changes[i].mHeight = floorHeightAt(i,0);
  }

  uint32_t previousTime = 0;
  uint32_t dt;

  int16_t moveDirection;
  int16_t shearDirection;
  int16_t rotationDirection;
  bool strafe;

  while (pokitto.isRunning())
  {
    if (pokitto.update())
    {
      draw();

      moveDirection = 0;
      shearDirection = 0;
      rotationDirection = 0;
      strafe = false;

      uint32_t timeNow = pokitto.getTime();
      dt = timeNow - previousTime;
      previousTime = timeNow;

      if (flyBy)
      {
        cameraFlyBy(dt);

        if (pokitto.aBtn() || pokitto.bBtn() || pokitto.cBtn() ||
            pokitto.upBtn() || pokitto.downBtn() || pokitto.leftBtn() ||
            pokitto.rightBtn())
          flyBy = false;

        continue;
      }

      strafe = pokitto.aBtn();

      if (pokitto.cBtn())
      {
        if (editReleased)
        {
          editing = !editing;

          if (editing)
          {
            RCL_Vector2D facingOffset;
            facingOffset.x = 0;
            facingOffset.y = 0;

            if (player.mCamera.direction > (4 * RCL_UNITS_PER_SQUARE / 12) &&
              player.mCamera.direction <= (8 * RCL_UNITS_PER_SQUARE / 12))
              facingOffset.x = -1;
            else if (player.mCamera.direction < (2 * RCL_UNITS_PER_SQUARE / 12) ||
              player.mCamera.direction >= (10 * RCL_UNITS_PER_SQUARE / 12))
              facingOffset.x = 1;
            else
              facingOffset.x = 0;

            if (player.mCamera.direction > (RCL_UNITS_PER_SQUARE / 12) &&
              player.mCamera.direction <= (5 * RCL_UNITS_PER_SQUARE / 12))
              facingOffset.y = -1;
            else if (player.mCamera.direction > (6 * RCL_UNITS_PER_SQUARE / 12) &&
              player.mCamera.direction <= (11 * RCL_UNITS_PER_SQUARE / 12))
              facingOffset.y = 1;
            else
              facingOffset.y = 0;

            selectedSquare.x = RCL_divRoundDown(player.mCamera.position.x,RCL_UNITS_PER_SQUARE) + facingOffset.x;
            selectedSquare.y = RCL_divRoundDown(player.mCamera.position.y,RCL_UNITS_PER_SQUARE) + facingOffset.y;

            changeIndex = (changeIndex + 1) % MAX_CHANGES;

            for (uint16_t i = 0; i < MAX_CHANGES; ++i)
              if (changes[i].mCoords.x == selectedSquare.x &&
                  changes[i].mCoords.y == selectedSquare.y)
              {
                changeIndex = i;
                break;
              }

            changes[changeIndex].mHeight = floorHeightAt(selectedSquare.x,selectedSquare.y);
            changes[changeIndex].mColor = colorAt(selectedSquare.x,selectedSquare.y);
            changes[changeIndex].mCoords.x = selectedSquare.x;
            changes[changeIndex].mCoords.y = selectedSquare.y;
            editCounter = 0;
          }
        
          editReleased = false;
        }
      }
      else
        editReleased = true;

      if (pokitto.upBtn())
      {
        if (editing)
        {
          if (editCounter == 0)
          {
            changes[changeIndex].mHeight += RCL_UNITS_PER_SQUARE / 4;
            editCounter = 4;
          }
        }
        else if (strafe)
          shearDirection = 1;
        else
          moveDirection = 1;
      }
      else if (pokitto.downBtn())
      {
        if (editing)
        {
          if (editCounter == 0)
          {
            changes[changeIndex].mHeight -= RCL_UNITS_PER_SQUARE / 4;
            editCounter = 4;
          }
        }
        else if (strafe)
          shearDirection = -1;
        else
          moveDirection = -1;
      }
 
      uint16_t colorAddition = 0;

      if (pokitto.rightBtn())
      {
        if (strafe)
          moveDirection = 1;
        else if (!editing)
          rotationDirection = 1;
        else
          colorAddition = 1;      
      }
      else if (pokitto.leftBtn())
      {
        if (strafe)
          moveDirection = - 1;
        else if (!editing)
          rotationDirection = -1;
        else
          colorAddition = -1;      
      }

      if (editing)
      {
        int16_t heightDiff = changes[changeIndex].mHeight - player.mCamera.height;

        if (heightDiff > RCL_UNITS_PER_SQUARE / 2)
          shearDirection = 1; 
        else if (heightDiff < -1 * RCL_UNITS_PER_SQUARE / 2)
          shearDirection = -1; 

        if (editCounter == 0 && colorAddition != 0)
        {
          changes[changeIndex].mColor = RCL_wrap(changes[changeIndex].mColor + colorAddition,SQUARE_COLORS);
          editCounter = 4;
        }
      }

      editCounter = max(0, editCounter - 1);

      player.update(moveDirection,strafe,rotationDirection,pokitto.bBtn(),shearDirection,
        floorHeightAt,0,true,dt);
    }
  }

  return 0;
}