/**
  WIP raycasting demo for Pokitto.

  Don't forget to compile with -O3!

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

#define CAMERA_COLL_HEIGHT_BELOW ((3 * UNITS_PER_SQUARE) / 2)

#include "general.hpp"

#define LEVEL_X_RES 29
#define LEVEL_Y_RES 21

Player player;

#define SPRITES 3
#define SPRITE_MAX_DISTANCE 5 * UNITS_PER_SQUARE

#define JUMP_SPEED 500

Sprite sprites[SPRITES];

/// For each level square says the texture index.
const unsigned char levelTexture[] =
{
   1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 0, 3, 0, 3, 3, 2, 2, 2, 2, 
   1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 1, 1, 1, 2, 
   1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 2, 
   1, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 1, 1, 1, 2, 
   1, 0, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 2, 
   1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 1, 1, 1, 2, 
   1, 0, 1, 0, 0, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 
   1, 0, 1, 0, 0, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 0, 0, 0, 2, 
   1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 
   1, 1, 1, 0, 0, 0, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 
   1, 1, 1, 1, 0, 0, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 
   1, 1, 1, 1, 0, 0, 3, 3, 3, 3, 0, 0, 0, 0, 0, 3, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 
   1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 
   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 3, 3, 3, 3, 3, 
   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 0, 0, 0, 0, 0, 
   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 3, 3, 3, 3, 3, 
   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 3, 3, 3, 3, 3, 
   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 3, 3, 3, 3, 3, 
   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 3, 3, 3, 3, 3, 
   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 3, 3, 3, 3, 3, 
   1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3 
};

/// For each level square says the floor height.
const signed char levelFloor[] =
{
  40,40,40,40,40,40,40,40,48,40,48,40,40,40,40,40,40,48,40,48,40,48,40,48,48,24,24,26,28,
  40, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,40, 2, 2, 2,40,32,32,32,32,32,32,32,48, 2, 2, 2,26,
  40, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,40, 2, 2, 2,40, 0, 0, 0, 0, 0,32,32,40, 2, 2, 2,26,
  40,16,12, 8, 4, 0,48, 0, 0, 0, 0, 0,24, 2,24, 8,24, 0, 0, 9, 9, 0,28,32,48, 2, 2, 2,24,
  40,20,48,48,48,48,48, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 9, 9, 0,24,32,40, 0, 0, 0,24,
  40,24,48,40,40,40,40, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,20,32,48, 0, 0, 0,24,
  40,28,32,32,32,32, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, 8,12,16,32,40, 0, 0, 0,24,
  40,32,32,32,32,32, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,32,32,32,32,32,32,48, 0, 0, 0,24,
  40, 0,48,40,40,40,40, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,32,-3,-8,-8,-5,-2, 0, 0, 0, 0,24,
  40, 0,-3,-8,-8,-8,32, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,32,-3,-8,-8, 0, 0, 0, 0, 0, 0,24,
  40, 0,-6,-8,-8,-8,32, 0, 0, 0,48,48, 0,48,48, 0, 0,36,32,36,-8,-8, 0, 0, 0, 0, 0, 0,24,
  40, 0,48,-8,-8,-8,32,32,32,32,40, 1, 0, 1,40,32,32,32,32,32,-8,-8, 0, 0, 0, 0, 0, 0,24,
  40, 0,48,-8,-8,-8,-8,-8,-8,-8,-8, 0, 0, 0,-8,-8,-8,36,32,36,-8,-8, 0, 0, 0, 0, 0, 0,24,
  40, 0,48,-8,-8,-8,-8,-8,-8,-8,-8, 0, 0, 0,-8,-8,-8,-8,-8,-8,-8,-8, 0, 0, 0, 0, 0, 0,24,
  40, 0,48, 0,-2,-2, 0,-8,-8,-8,-8, 0, 0, 0,-8,-8, 0, 0, 0, 0, 0, 0, 0, 0,24,24,10,24,24,
  40, 0, 0, 0,-2,-2, 0, 0, 0, 0, 8, 0, 0, 0, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0,24, 0, 0, 0,24,
  40, 0, 0, 0,-2,-2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,24, 0, 0, 0,24,
  40,24,48,-2,-2,-2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,24,
   0,24,48,48,-2,-2,-2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,24,
   0,24,48,48,48,-2,-2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,24, 0, 0, 0,24,
   0,24,24,24,32,32,32,27,24,27,30,34,36,38,36,34,36,34,34,32,32,33,37,39,24,24,24,24,24
};

/// For each level square says the ceiling height.
const signed char levelCeiling[] =
{
  40,40,40,40,40,40,40,99,99,99,99,36,40,40,40,40,40,36,99,99,99,99,99,99,99,99,99,99,99,
  40,50,50,50,45,40,20,99,99,99,99,36,40,30,30,30,99,36,99,99,99,99,99,99,99,99,99,99,99,
  40,50,50,50,45,40,20,99,99,99,99,36,40,30,30,30,99,36,99,99,99,99,99,99,99,99,99,99,99,
  40,50,50,50,45,40,48,99,99,99,99,36,24,24,24,24,24,36,99,99,99,99,99,99,99,99,99,99,99,
  40,50,48,48,48,48,47,99,99,99,99,36,36,36,36,36,36,36,99,99,99,99,99,99,99,99,99,99,99,
  40,50,48,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,
  40,50,48,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,
  40,50,48,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,
  40,50,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,
  40,40,16,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,
  40,30,16,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,
  40,25,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,
  40,20,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,
  40,18,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,24,24,24,24,24,24,
  40,18,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,24,24,24,24,24,24,
  40,18,16,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,24,24,25,27,29,24,
  40,18,16,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,24,24,25,27,29,24,
  40,24,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,24,24,25,27,29,24,
  99,24,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,24,24,25,27,29,24,
  99,24,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,24,24,25,27,29,24,
  99,24,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,24,24,24,24,24,24
};

const unsigned char texture1[] =
{  32, 32 // width, height
  ,0x12,0x65,0x65,0x6d,0x24,0x64,0x5b,0x12,0x12,0x64,0x5b,0x5b,0x12,0x51
  ,0x12,0x09,0x00,0x6d,0x6d,0x6d,0x24,0x5b,0x5b,0x52,0x12,0x5b,0x52,0x5b
  ,0x12,0x5b,0x52,0x09,0x12,0x5b,0x5b,0x5b,0x52,0x5b,0x5b,0x52,0x00,0x64
  ,0x64,0x52,0x52,0x52,0x5b,0x00,0x09,0x6d,0x5b,0x5a,0x5b,0x5b,0x5a,0x51
  ,0x12,0x64,0x5b,0x52,0x5b,0x52,0x5b,0x08,0x12,0x24,0x5b,0x5b,0x5b,0x5b
  ,0x09,0x11,0x00,0x64,0x5b,0x5b,0x5a,0x09,0x09,0x08,0x00,0x5b,0x5b,0x5b
  ,0x5a,0x64,0x12,0x51,0x00,0x64,0x5b,0x52,0x52,0x11,0x09,0x09,0x12,0x24
  ,0x5b,0x5b,0x52,0x5a,0x12,0x09,0x00,0x5b,0x52,0x09,0x12,0x09,0x09,0x09
  ,0x00,0x24,0x5a,0x5a,0x5b,0x51,0x12,0x08,0x09,0x25,0x5b,0x52,0x5b,0x52
  ,0x11,0x09,0x12,0x64,0x5b,0x52,0x09,0x11,0x12,0x09,0x00,0x12,0x00,0x12
  ,0x00,0x00,0x00,0x08,0x09,0x64,0x5b,0x51,0x12,0x11,0x12,0x08,0x09,0x64
  ,0x5a,0x5b,0x12,0x12,0x09,0x09,0x12,0x65,0x5c,0x52,0x5a,0x5b,0x51,0x09
  ,0x00,0x64,0x6d,0x6d,0x5c,0x65,0x64,0x09,0x00,0x24,0x64,0x5b,0x09,0x12
  ,0x11,0x00,0x09,0x64,0x5b,0x52,0x52,0x12,0x12,0x08,0x00,0x64,0x52,0x52
  ,0x52,0x52,0x5b,0x09,0x00,0x6d,0x5b,0x5b,0x52,0x5b,0x51,0x09,0x00,0x1b
  ,0x5b,0x12,0x12,0x12,0x12,0x09,0x12,0x5b,0x11,0x09,0x11,0x09,0x09,0x09
  ,0x09,0x5b,0x09,0x09,0x09,0x09,0x09,0x09,0x12,0x65,0x5b,0x5b,0x5b,0x52
  ,0x5b,0x09,0x00,0x64,0x12,0x63,0x5b,0x12,0x5b,0x09,0x00,0x00,0x00,0x00
  ,0x00,0x09,0x00,0x00,0x00,0x09,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x5b
  ,0x64,0x5b,0x09,0x5b,0x52,0x09,0x09,0x5b,0x11,0x52,0x09,0x12,0x09,0x08
  ,0x00,0x1b,0x1b,0x23,0x1b,0x5a,0x5b,0x11,0x12,0x64,0x64,0x6d,0x24,0x5b
  ,0x5b,0x09,0x00,0x5b,0x5a,0x52,0x52,0x09,0x08,0x09,0x12,0x5b,0x52,0x11
  ,0x5a,0x11,0x12,0x08,0x08,0x1b,0x52,0x52,0x5b,0x5a,0x09,0x09,0x12,0x64
  ,0x5b,0x64,0x12,0x12,0x12,0x08,0x00,0x00,0x00,0x12,0x09,0x00,0x09,0x00
  ,0x12,0x24,0x5a,0x52,0x12,0x12,0x12,0x08,0x12,0x1b,0x12,0x5a,0x49,0x5a
  ,0x52,0x09,0x12,0x6d,0x5b,0x52,0x5a,0x12,0x09,0x09,0x12,0x65,0x64,0x6d
  ,0x6d,0x64,0x64,0x5b,0x00,0x5a,0x08,0x08,0x09,0x09,0x08,0x09,0x00,0x5b
  ,0x5a,0x11,0x51,0x51,0x5a,0x09,0x12,0x6d,0x5b,0x5b,0x12,0x11,0x12,0x09
  ,0x00,0x65,0x5b,0x64,0x5b,0x5b,0x5b,0x52,0x00,0x00,0x12,0x12,0x12,0x09
  ,0x00,0x00,0x00,0x5a,0x52,0x52,0x09,0x52,0x09,0x09,0x12,0x63,0x5b,0x5a
  ,0x09,0x5b,0x11,0x08,0x00,0x65,0x5b,0x5b,0x52,0x5b,0x52,0x52,0x00,0x65
  ,0x6d,0x64,0x65,0x64,0x64,0x5b,0x00,0x5b,0x12,0x09,0x11,0x09,0x09,0x09
  ,0x09,0x5b,0x11,0x08,0x09,0x09,0x09,0x08,0x00,0x64,0x64,0x5b,0x5b,0x5b
  ,0x5b,0x09,0x00,0x5b,0x5b,0x5b,0x5b,0x5b,0x52,0x52,0x00,0x64,0x51,0x52
  ,0x52,0x52,0x09,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x12,0x00,0x00,0x5b
  ,0x5b,0x5b,0x52,0x52,0x5b,0x09,0x12,0x65,0x5b,0x5b,0x5b,0x52,0x5b,0x09
  ,0x00,0x63,0x5a,0x51,0x51,0x51,0x5a,0x08,0x12,0x24,0x64,0x65,0x24,0x64
  ,0x64,0x5b,0x00,0x5b,0x5b,0x52,0x5b,0x5b,0x52,0x09,0x00,0x64,0x5b,0x5b
  ,0x12,0x52,0x5a,0x09,0x12,0x24,0x52,0x52,0x09,0x52,0x52,0x08,0x12,0x64
  ,0x64,0x5b,0x5b,0x5b,0x64,0x52,0x00,0x6d,0x5b,0x52,0x5b,0x52,0x52,0x08
  ,0x00,0x5b,0x5b,0x52,0x52,0x5b,0x52,0x09,0x00,0x1b,0x52,0x51,0x5a,0x52
  ,0x09,0x09,0x12,0x64,0x52,0x5c,0x5b,0x64,0x5b,0x51,0x09,0x6d,0x5b,0x52
  ,0x5b,0x52,0x11,0x09,0x00,0x64,0x5a,0x64,0x5b,0x52,0x5b,0x08,0x00,0x11
  ,0x09,0x49,0x08,0x09,0x00,0x09,0x00,0x64,0x64,0x5b,0x52,0x5b,0x5b,0x09
  ,0x12,0x65,0x64,0x5b,0x52,0x5b,0x52,0x09,0x12,0x64,0x64,0x64,0x52,0x09
  ,0x5c,0x08,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x12,0x64,0x5b,0x64
  ,0x52,0x5b,0x52,0x49,0x00,0x64,0x5b,0x52,0x52,0x5b,0x51,0x09,0x09,0x5b
  ,0x09,0x09,0x09,0x08,0x09,0x12,0x00,0x6d,0x24,0x6d,0x24,0x64,0x64,0x5b
  ,0x00,0x64,0x63,0x5b,0x5b,0x52,0x52,0x09,0x12,0x64,0x5b,0x5b,0x52,0x11
  ,0x5b,0x09,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x09,0x12,0x6d,0x64,0x5b
  ,0x52,0x64,0x5b,0x52,0x12,0x6d,0x5b,0x5b,0x5b,0x5b,0x5b,0x09,0x00,0x64
  ,0x11,0x5a,0x52,0x5b,0x52,0x09,0x00,0x5b,0x5a,0x63,0x5a,0x23,0x12,0x00
  ,0x12,0x6d,0x5b,0x11,0x5b,0x64,0x64,0x52,0x12,0x63,0x5b,0x5b,0x5b,0x5b
  ,0x52,0x08,0x00,0x5c,0x52,0x5b,0x5b,0x52,0x52,0x08,0x08,0x5b,0x52,0x51
  ,0x09,0x52,0x5a,0x09,0x00,0x6d,0x52,0x11,0x52,0x5b,0x52,0x09,0x12,0x64
  ,0x5a,0x5b,0x52,0x5b,0x5b,0x08,0x00,0x5b,0x52,0x09,0x09,0x09,0x09,0x09
  ,0x09,0x24,0x52,0x09,0x12,0x09,0x52,0x08,0x00,0x5b,0x5a,0x52,0x12,0x5b
  ,0x5b,0x09,0x00,0x65,0x52,0x5b,0x5b,0x52,0x11,0x09,0x09,0x00,0x00,0x00
  ,0x00,0x12,0x00,0x08,0x00,0x5b,0x52,0x51,0x09,0x09,0x09,0x09,0x00,0x64
  ,0x5b,0x52,0x52,0x09,0x5b,0x09,0x12,0x6d,0x5b,0x5b,0x5b,0x5b,0x5a,0x11
  ,0x00,0x6d,0x6d,0x24,0x64,0x64,0x5b,0x5b,0x00,0x5a,0x12,0x52,0x12,0x09
  ,0x12,0x08,0x00,0x5b,0x12,0x09,0x09,0x09,0x08,0x09,0x00,0x64,0x5b,0x5b
  ,0x52,0x5a,0x5b,0x09,0x12,0x6d,0x64,0x5a,0x5b,0x5b,0x5b,0x5b,0x00,0x5a
  ,0x11,0x52,0x09,0x12,0x09,0x09,0x09,0x00,0x00,0x00,0x00,0x12,0x12,0x12
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  ,0x52,0x09
};

const unsigned char texture2[] =
{  32, 32 // width, height
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  ,0x66,0x25
};

const unsigned char texture3[] =
{  32, 32 // width, height
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  ,0x56,0x54
};

const unsigned char texture4[] =
{  32, 32 // width, height
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  ,0x12,0x00
};

const unsigned char sprite1[] =
{  32, 32 // width, height
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  ,0x00,0x00,0x09,0x76,0x09,0x64,0x09,0x64,0x52,0x52,0x52,0x00,0x07,0x00
  ,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x00,0x64,0x52,0x00,0x00,0x76,0x76
  ,0x00,0x07,0x07,0x07,0x00,0x64,0x09,0x76,0x52,0x64,0x09,0x76,0x09,0x52
  ,0x52,0x00,0x07,0x07,0x07,0x07,0x07,0x00,0x00,0x00,0x07,0x00,0x64,0x09
  ,0x00,0x76,0x64,0x00,0x00,0x07,0x07,0x07,0x00,0x52,0x00,0x76,0x09,0x52
  ,0x09,0x64,0x52,0x64,0x52,0x00,0x07,0x00,0x07,0x07,0x00,0x64,0x76,0x64
  ,0x00,0x07,0x00,0x09,0x76,0x64,0x76,0x00,0x76,0x00,0x07,0x00,0x64,0x64
  ,0x09,0x64,0x52,0x64,0x09,0x76,0x52,0x64,0x52,0x00,0x00,0xff,0x00,0x00
  ,0x76,0x00,0x00,0x64,0x64,0x00,0x52,0x52,0x64,0x00,0x00,0x76,0x64,0x64
  ,0x00,0x64,0x00,0x00,0x09,0x76,0x09,0x64,0x09,0x76,0x52,0x52,0x52,0x00
  ,0x07,0x00,0x76,0x76,0x00,0x07,0x07,0x00,0x64,0x00,0x09,0x64,0x52,0x64
  ,0x64,0x64,0x00,0x00,0x64,0x00,0x00,0x52,0x09,0x64,0x09,0x52,0x00,0x76
  ,0x09,0x64,0x52,0x00,0x07,0x07,0x00,0x00,0x07,0x07,0x07,0x00,0x64,0x52
  ,0x64,0x52,0x52,0x64,0x64,0x00,0x07,0x07,0x00,0x07,0x00,0x52,0x09,0x64
  ,0x52,0x52,0x00,0x64,0x09,0x52,0x52,0x00,0x07,0x07,0x00,0x00,0x07,0x07
  ,0x07,0x00,0x64,0x52,0x64,0x52,0x52,0x52,0x64,0x00,0x07,0x07,0x00,0x07
  ,0x00,0x52,0x00,0x64,0x09,0x64,0x00,0x64,0x09,0x52,0x52,0x00,0x07,0x00
  ,0x64,0x64,0x00,0x07,0x07,0x00,0x52,0x00,0x09,0x64,0x52,0x52,0x52,0x64
  ,0x00,0x00,0x64,0x00,0x00,0x09,0x00,0x76,0x09,0x52,0x00,0x76,0x09,0x52
  ,0x52,0x00,0x00,0x64,0x00,0x00,0x64,0x00,0x00,0x52,0x64,0x00,0x52,0x52
  ,0x64,0x00,0x00,0x64,0x64,0x64,0x00,0x64,0x00,0x00,0x00,0x64,0x09,0x52
  ,0x00,0x64,0x52,0x52,0x52,0x00,0x07,0x00,0x07,0x07,0x00,0x52,0x64,0x52
  ,0x00,0x07,0x00,0x09,0x64,0x64,0x64,0x00,0x64,0x00,0x07,0x00,0x64,0x64
  ,0x00,0x64,0x09,0x52,0x00,0x64,0x09,0x64,0x52,0x00,0x07,0x07,0x07,0x07
  ,0x07,0x00,0x00,0x00,0x07,0x00,0x64,0x00,0x00,0x64,0x52,0x00,0x00,0x07
  ,0x07,0x07,0x00,0x52,0x09,0x64,0x52,0x52,0x00,0x64,0x52,0x52,0x52,0x00
  ,0x07,0x00,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x00,0x64,0x00,0x00,0x00
  ,0x64,0x64,0x00,0x07,0x07,0x07,0x00,0x64,0x00,0x64,0x09,0x52,0x00,0x52
  ,0x09,0x52,0x52,0x00,0x00,0x64,0x00,0x07,0x07,0x07,0x07,0x07,0x00,0x64
  ,0x00,0x00,0x09,0x00,0x00,0x00,0x07,0x07,0x07,0x07,0x00,0x00,0x00,0x52
  ,0x52,0x52,0x00,0x64,0x09,0x52,0x52,0x00,0x00,0x64,0x64,0x00,0x00,0x00
  ,0x00,0x00,0x64,0x00,0x00,0x09,0x09,0x09,0x00,0x00,0x00,0x00,0x07,0x07
  ,0x00,0x00,0x00,0x64,0x09,0x52,0x00,0x52,0x09,0x52,0x52,0x00,0x07,0x00
  ,0x64,0x00,0x09,0x52,0x52,0x52,0x09,0x09,0x52,0x09,0x52,0x52,0x52,0x52
  ,0x52,0x00,0x00,0x07,0x00,0x09,0x00,0x52,0x09,0x52,0x00,0x52,0x52,0x52
  ,0x52,0x00,0x07,0x07,0x00,0x64,0x00,0x09,0x09,0x09,0x09,0x09,0x09,0x09
  ,0x09,0x09,0x09,0x00,0x00,0x00,0x07,0x07,0x07,0x00,0x09,0x64,0x52,0x52
  ,0x00,0x64,0x09,0x52,0x52,0x00,0x07,0x07,0x07,0x00,0x64,0x64,0x00,0x09
  ,0x09,0x52,0x09,0x09,0x09,0x09,0x52,0x00,0x00,0x07,0x07,0x07,0x07,0x07
  ,0x00,0x52,0x52,0x52,0x00,0x52,0x09,0x52,0x52,0x00,0x07,0x07,0x07,0x07
  ,0x00,0x00,0x64,0x64,0x09,0x09,0x09,0x52,0x09,0x52,0x09,0x00,0x00,0x00
  ,0x00,0x07,0x07,0x07,0x07,0x00,0x00,0x00,0x00,0x64,0x52,0x52,0x52,0x00
  ,0x07,0x07,0x07,0x07,0x07,0x07,0x00,0x00,0x64,0x64,0x09,0x09,0x52,0x09
  ,0x52,0x09,0x00,0x00,0x00,0x00,0x07,0x07,0x07,0x07,0x00,0x00,0x09,0x52
  ,0x52,0x52,0x52,0x00,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x00,0x00
  ,0x64,0x64,0x64,0x09,0x09,0x09,0x09,0x09,0x00,0x00,0x00,0x00,0x07,0x07
  ,0x07,0x07,0x00,0x00,0x00,0x00,0x00,0x00,0x07,0x07,0x07,0x07,0x07,0x07
  ,0x07,0x07,0x07,0x07,0x00,0x00,0x00,0x64,0x64,0x64,0x64,0x64,0x64,0x64
  ,0x64,0x64,0x00,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07
  ,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x00,0x00,0x00
  ,0x00,0x00,0x00,0x00,0x00,0x00,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07
  ,0x07,0x07
};

const unsigned char sprite2[] =
{  32, 32 // width, height
  ,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07
  ,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07
  ,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07
  ,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07
  ,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07
  ,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07
  ,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07
  ,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07
  ,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07
  ,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07
  ,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07
  ,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07
  ,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x00,0x00,0x00,0x07,0x07,0x07
  ,0x07,0x07,0x07,0x07,0x07,0x07,0x00,0x07,0x07,0x07,0x07,0x07,0x07,0x07
  ,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x00,0xbf,0xbf
  ,0xbf,0x00,0x07,0x07,0x07,0x07,0x07,0x00,0x00,0x00,0x27,0x00,0x07,0x07
  ,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07
  ,0x07,0x00,0xbf,0x5b,0x5b,0x00,0x00,0x00,0x00,0x00,0x00,0x27,0x27,0x27
  ,0x0c,0x00,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07
  ,0x07,0x07,0x07,0x07,0x00,0x52,0x6d,0x5b,0x09,0x0c,0x0c,0x0c,0x27,0x27
  ,0x27,0x0c,0x0a,0x0a,0x0a,0x00,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07
  ,0x07,0x07,0x07,0x07,0x07,0x00,0x07,0x00,0x5b,0x09,0x09,0x09,0x0a,0x0a
  ,0x0a,0x0a,0x0a,0x0a,0x0a,0x0a,0x0b,0x0b,0x0a,0x00,0x07,0x07,0x00,0x00
  ,0x00,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x00,0x3f,0x00,0x5b,0x09,0x5b
  ,0x09,0x00,0x02,0x01,0x01,0x0a,0x0a,0x0a,0x0a,0x0a,0x0a,0x0a,0x0a,0x00
  ,0x00,0x07,0x00,0x3e,0xb6,0x00,0x07,0x00,0x07,0x07,0x07,0x00,0x15,0x15
  ,0x3d,0x09,0x09,0x09,0x00,0x01,0x01,0x0a,0x0a,0x0a,0x0a,0x0a,0x0a,0x01
  ,0x01,0x01,0x01,0x52,0x52,0x00,0x07,0x00,0x3e,0x6d,0x00,0xb6,0x00,0x07
  ,0x00,0x0c,0x0c,0x15,0x15,0x3d,0x00,0x00,0x0a,0x0a,0x00,0x00,0x00,0x01
  ,0x01,0x01,0x01,0x01,0x01,0x01,0x52,0x6d,0x52,0x00,0x07,0x07,0x00,0x3d
  ,0x5b,0x6d,0x00,0x00,0x27,0x27,0x0c,0x0c,0x15,0x3f,0x00,0x01,0x00,0x00
  ,0x09,0x00,0x52,0x00,0x09,0x00,0x00,0x00,0x01,0x01,0x09,0xb6,0x09,0x00
  ,0x07,0x07,0x07,0x00,0x3d,0x09,0x00,0x0a,0x0c,0x15,0x27,0x09,0x09,0x09
  ,0x09,0x00,0x3f,0x00,0x52,0x09,0x64,0x00,0x3d,0x3d,0x3f,0x64,0x64,0x09
  ,0xb6,0x6d,0x09,0x00,0x07,0x07,0x00,0xbf,0x6d,0x00,0x5b,0x52,0x0a,0x09
  ,0x09,0x09,0x5b,0x6d,0x09,0x5b,0x3d,0x00,0x64,0x00,0x64,0x09,0x00,0x1d
  ,0x3f,0x5b,0x52,0x52,0x09,0x52,0x00,0x00,0x07,0x00,0xb6,0xff,0x3e,0x00
  ,0x3e,0x3e,0x3d,0x09,0x5b,0x6d,0xbf,0xb6,0x52,0x3e,0x1d,0x3d,0x00,0x64
  ,0x00,0x52,0x00,0x00,0x09,0x52,0x52,0x12,0x09,0x00,0x00,0x00,0x00,0x3d
  ,0x3d,0x3d,0x00,0x00,0x00,0x00,0x09,0x09,0x09,0x6d,0x6d,0x52,0x52,0x3e
  ,0x1d,0x3d,0x00,0x64,0x00,0x52,0x00,0x02,0x00,0x00,0x09,0x00,0x00,0x01
  ,0x00,0x00,0x07,0x00,0x52,0x5b,0x3d,0x00,0x3d,0x3f,0x3f,0x09,0x5b,0x52
  ,0x5b,0x6d,0x52,0x3d,0x1d,0x3f,0x00,0x64,0x00,0x52,0x00,0x01,0x01,0x01
  ,0x01,0x0a,0x0a,0x0a,0x00,0x00,0x07,0x07,0x00,0x52,0x5b,0x00,0x52,0x52
  ,0x0a,0x27,0x09,0x09,0x09,0x09,0x52,0x5b,0x3f,0x00,0x00,0x64,0x00,0x52
  ,0x00,0x00,0x01,0x01,0x01,0x01,0x01,0x01,0x00,0x07,0x07,0x07,0x07,0x00
  ,0x3f,0x09,0x00,0x0a,0x0c,0x27,0x0c,0x15,0x3f,0x09,0x09,0x09,0x3f,0x00
  ,0x64,0x00,0x52,0x09,0x00,0x3d,0x3f,0x5b,0x00,0x00,0x01,0x01,0x00,0x07
  ,0x07,0x07,0x00,0x1d,0x52,0x5b,0x00,0x0c,0x27,0x0c,0x0c,0x15,0x0c,0x3d
  ,0x00,0x00,0x00,0x00,0x52,0x09,0x00,0x00,0x3f,0x3e,0x3d,0x52,0x52,0x64
  ,0x09,0x52,0x00,0x00,0x07,0x00,0x1d,0x5b,0x00,0x5b,0x00,0x27,0x0c,0x0c
  ,0x15,0x15,0x15,0x3d,0x52,0x52,0x0a,0x52,0xbf,0x6d,0x00,0x00,0x00,0x3f
  ,0x52,0x12,0x12,0x09,0x64,0xb6,0x52,0x00,0x00,0x3f,0x5b,0x00,0x07,0x00
  ,0x07,0x00,0x00,0x0c,0x27,0x15,0x15,0x3e,0x00,0x09,0x52,0xbf,0x6d,0x5b
  ,0x0a,0x0a,0x0a,0x01,0x00,0x00,0x00,0x00,0x00,0x64,0x09,0x00,0x00,0x00
  ,0x00,0x07,0x07,0x07,0x07,0x07,0x07,0x00,0x00,0x27,0x3e,0x27,0x27,0x15
  ,0x09,0x00,0x00,0x0a,0x0a,0x0a,0x0a,0x0a,0x01,0x01,0x01,0x00,0x00,0x09
  ,0x09,0x00,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x00
  ,0x3d,0x0c,0x0c,0x27,0x27,0x27,0x27,0x15,0x0a,0x0a,0x0a,0x0a,0x0a,0x0a
  ,0x01,0x01,0x01,0x0a,0x00,0x00,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07
  ,0x07,0x07,0x07,0x07,0x00,0x00,0x00,0x00,0x00,0x00,0x15,0x27,0x27,0x27
  ,0x27,0x15,0x15,0x0a,0x0a,0x0a,0x0a,0x0a,0x00,0x07,0x07,0x07,0x07,0x07
  ,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07
  ,0x00,0x00,0x00,0x00,0x00,0x00,0x15,0x15,0x15,0x15,0x15,0x15,0x00,0x07
  ,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07
  ,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x00,0x00,0x00,0x00
  ,0x00,0x00,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07
  ,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07
  ,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07
  ,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07
  ,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07
  ,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07
  ,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07
  ,0x07,0x07
};

const unsigned char *textures[] = {texture1, texture2, texture3, texture4};

Unit textureAt(int16_t x, int16_t y)
{
  if (x >= 0 && x < LEVEL_X_RES && y >= 0 && y < LEVEL_Y_RES)
    return levelTexture[(LEVEL_Y_RES - y -1) * LEVEL_X_RES + x]; 

  return 0;
}

Unit floorHeightAt(int16_t x, int16_t y)
{
  if (x >= 0 && x < LEVEL_X_RES && y >= 0 && y < LEVEL_Y_RES)
    return (levelFloor[(LEVEL_Y_RES - y -1) * LEVEL_X_RES + x] * UNITS_PER_SQUARE) / 8; 

  return 0;
}

Unit ceilingHeightAt(int16_t x, int16_t y)
{
  signed char v = 99;

  if (x >= 0 && x < LEVEL_X_RES && y >= 0 && y < LEVEL_Y_RES)
    v = levelCeiling[(LEVEL_Y_RES - y -1) * LEVEL_X_RES + x]; 

  return (v * UNITS_PER_SQUARE) / 8;
}

/**
  Function for drawing a single pixel (like fragment shader).
*/
inline void pixelFunc(PixelInfo pixel)
{
  if (pixel.position.y == MIDDLE_ROW)
    zBuffer[pixel.position.x] = pixel.depth;

  uint8_t c;

  Unit depth = pixel.depth - UNITS_PER_SQUARE * 3;
  depth = depth > 0 ? depth : 1;

  int intensity = 7 - (depth * 7) / (UNITS_PER_SQUARE * 5);

  if (intensity < 0)
    intensity = 0;

  if (pixel.isWall)
  {
    if ((pixel.hit.direction == 0 || pixel.hit.direction == 2))
      intensity -= 2;

    if (intensity < 0)
      intensity = 0;

    c = sampleImage(textures[pixel.hit.type],pixel.hit.textureCoord,pixel.textureCoordY);
    c = addIntensity(c,intensity - 3);
  }
  else
    c = pixel.isFloor ?
          rgbToIndex(intensity/2,intensity,intensity/3) :
          rgbToIndex(intensity,intensity/2,0);


  uint8_t *buf = pokitto.display.screenbuffer;

  buf += pixel.position.x * SUBSAMPLE;
  buf += pixel.position.y * pokitto.display.width;

  for (uint8_t i = 0; i < SUBSAMPLE - 1; ++i)
    *buf++ = c;

  *buf = c;
}

void draw()
{
  RayConstraints c;

  c.maxHits = 8;
  c.maxSteps = 10;
  c.computeTextureCoords = 1;

  render(player.mCamera,floorHeightAt,ceilingHeightAt,textureAt,pixelFunc,c);

  Unit previousDepth;

  // draw sprites

  for (uint8_t i = 0; i < SPRITES; ++i)
  {
    if (dist(sprites[i].mPosition,player.mCamera.position) > SPRITE_MAX_DISTANCE)
      continue;

    PixelInfo pos = mapToScreen(sprites[i].mPosition,sprites[i].mHeight,player.mCamera);

    if (pos.depth > 0)
      drawSprite(sprites[i].mImage,pos.position.x * SUBSAMPLE,pos.position.y,
                 pos.depth,perspectiveScale(sprites[i].mPixelSize,pos.depth));

    if (i != 0 && pos.depth > previousDepth)
    {
      Sprite tmp = sprites[i];
      sprites[i] = sprites[i - 1];
      sprites[i - 1] = tmp;
    }

    previousDepth = pos.depth;
  }
/*
pokitto.display.setColor(rgbToIndex(7,7,3));
pokitto.display.setCursor(1,1);
pokitto.display.print(player.mCamera.position.x);
pokitto.display.print(" ");
pokitto.display.print(player.mCamera.position.y);
pokitto.display.print(" ");
pokitto.display.print(player.mCamera.direction);
*/
}

int main()
{
  pokitto.begin();
  initPalette();

  player.setPositionSquare(4,5);

  sprites[0] = Sprite(sprite1,10,5,1,100);
  sprites[1] = Sprite(sprite1,14,5,1,100);
  sprites[2] = Sprite(sprite2,15,19,1,200);

  pokitto.display.persistence = 1;
  pokitto.setFrameRate(FPS);
  pokitto.display.setFont(fontTiny);

  uint32_t previousTime = 0;
  uint32_t dt;

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

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

      int16_t horizontalStep = (dt * PLAYER_SPEED) / 1000;
      int16_t rotationStep = (dt * PLAYER_ROTATION_SPEED) / 1000;

      Vector2D d = angleToDirection(player.mCamera.direction);

      Vector2D moveOffset;
 
      moveOffset.x = 0;
      moveOffset.y = 0;

      d.x = (d.x * horizontalStep) / UNITS_PER_SQUARE;
      d.y = (d.y * horizontalStep) / UNITS_PER_SQUARE;

      if (d.x == 0 && d.y == 0)
      {
        d.x = d.x > 0 ? horizontalStep : -1 * horizontalStep;
        d.y = d.y > 0 ? horizontalStep : -1 * horizontalStep;
      }

      bool strafe = pokitto.aBtn();
      bool lookUpDown = pokitto.cBtn();

      if (pokitto.upBtn())
      {
        if (lookUpDown)
          player.mCamera.shear = min(player.mCamera.shear + 10,60);
        else
          moveOffset = d;
      }
      else if (pokitto.downBtn())
      {
        if (lookUpDown)
          player.mCamera.shear = max(player.mCamera.shear - 10,-60);
        else
        {
          moveOffset.x = -1 * d.x;
          moveOffset.y = -1 * d.y;
        }
      }
      else
        player.mCamera.shear /= 2;
      
      if (!lookUpDown)  
        player.mCamera.shear /= 2;

      int addition = 0;

      if (pokitto.rightBtn())
        addition = 1;      
      else if (pokitto.leftBtn())
        addition = -1;

      if (strafe)
      {
        d = angleToDirection(player.mCamera.direction + UNITS_PER_SQUARE / 4);
        d.x = (d.x * horizontalStep * addition) / UNITS_PER_SQUARE;
        d.y = (d.y * horizontalStep * addition) / UNITS_PER_SQUARE;

        moveOffset = d;
      }
      else
        player.mCamera.direction += addition * rotationStep;
    
      Unit prevHeight = player.mCamera.height;

      moveCameraWithCollision(&player.mCamera,moveOffset,player.mVericalSpeed,
        floorHeightAt, ceilingHeightAt, 1);

      Unit heightDiff = player.mCamera.height - prevHeight;

      if (heightDiff == 0)
        player.mVericalSpeed = 0; // hit floor/ceiling

      if (player.mVericalSpeed == 0 && pokitto.bBtn())
      {
        int16_t camX = divRoundDown(player.mCamera.position.x,UNITS_PER_SQUARE);
        int16_t camY = divRoundDown(player.mCamera.position.y,UNITS_PER_SQUARE);

        if (player.mCamera.height - CAMERA_COLL_HEIGHT_BELOW -
          floorHeightAt(camX,camY) < 2)
          player.mVericalSpeed = JUMP_SPEED; // jump
      }     

      player.mVericalSpeed -= (dt * GRAVITY_ACCELERATION) / 1000; // gravity
    }
  }

  return 0;
}