/**
  WIP raycasting demo for Pokitto.

  Don't forget to compile with -O3!

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

//#define RAYCAST_TINY

#include <stdio.h>
#define VERTICAL_FOV UNITS_PER_SQUARE // for raycastlib
#include "raycastlib.h"
#include "Pokitto.h"

#define SUBSAMPLE 2

#define SCREEN_WIDTH 110
#define SCREEN_HEIGHT 88

#define SUBSAMPLED_WIDTH (SCREEN_WIDTH / SUBSAMPLE)
#define SUBSAMPLED_HEIGHT (SCREEN_HEIGHT / SUBSAMPLE)

#define MIDDLE_ROW (SCREEN_HEIGHT / 2)
#define MIDDLE_COLUMN (SCREEN_WIDTH / 2)

#define SPRITES 3
#define SPRITE_MAX_DISTANCE 5 * UNITS_PER_SQUARE

Pokitto::Core p;

Unit zBuffer[SUBSAMPLED_WIDTH];

#define LEVEL_X_RES 29
#define LEVEL_Y_RES 21

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 
};

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, 0, 4, 8,16,32,40, 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, 0,24,24,15,24,24,
  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
};

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,
  40,99,99,99,99,99,20,99,99,99,99,36,40,99,99,99,99,36,99,99,99,99,99,99,99,99,99,99,99,
  40,99,99,99,99,99,20,99,99,99,99,36,40,99,99,99,99,36,99,99,99,99,99,99,99,99,99,99,99,
  40,99,99,99,99,99,48,99,99,99,99,36,24,24,24,24,24,36,99,99,99,99,99,99,99,99,99,99,99,
  40,99,48,48,48,48,47,99,99,99,99,36,36,36,36,36,36,36,99,99,99,99,99,99,99,99,99,99,99,
  40,99,48,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,
  40,99,48,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,
  40,99,48,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,
  40,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,
  40,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,
  40,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,
  40,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,
  40,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,
  40,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,24,24,24,24,24,24,
  40,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,24,24,24,24,24,24,
  40,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,24,24,25,27,29,24,
  40,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,24,24,25,27,29,24,
  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,
  99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,24,24,25,27,29,24,
  99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,24,24,25,27,29,24,
  99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,24,24,24,24,24,24
};

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
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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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  ,0x52,0x64,0x52,0x76,0x52,0x64,0x52,0x00,0x00,0xff,0x00,0x07,0x07,0x07
  ,0x07,0x07,0x00,0x64,0x52,0x52,0x52,0x00,0x00,0x00,0x07,0x07,0x07,0x07
  ,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};

inline uint8_t sampleImage(const unsigned char *image, Unit x, Unit y)
{
  // TODO: optimize

  x = wrap(x,UNITS_PER_SQUARE);
  y = wrap(y,UNITS_PER_SQUARE);

  int32_t index =
    image[1] * ((image[1] * x) / UNITS_PER_SQUARE) + (image[0] * y) /
    UNITS_PER_SQUARE;

  return image[2 + index];
}

unsigned char translaprentColor;

void drawSprite(const unsigned char *sprite, int16_t x, int16_t y, Unit depth, int16_t size)
{
  // TODO: optimize

  x -= size / 2;
  y -= size / 2;

  Unit step = UNITS_PER_SQUARE / size;

  uint8_t c;

  int16_t jTo = size - max(0,y + size - 88);
  int16_t iTo = size - max(0,x + size - 110);

  for (Unit i = max(-1 * x,0); i < iTo; ++i)
  {
    int16_t xPos = x + i;

    if (zBuffer[xPos / SUBSAMPLE] <= depth)
      continue;

    for (Unit j = max(-1 * y,0); j < jTo; ++j)
    {
      c = sampleImage(sprite,(i * UNITS_PER_SQUARE) / size,(j * UNITS_PER_SQUARE) / size); 
     
      if (c != translaprentColor)
        p.display.drawPixel(xPos,y + j,c);
    }
  }
}

// r: 3 bits, g: 3 bits, b: 2 bits
inline uint8_t rgbToIndex(uint8_t r, uint8_t g, uint8_t b)
{
  return (r & 0b00000111) | ((g & 0b00000111) << 3) | ((b & 0b00000011) << 6);
}

inline uint8_t addIntensity(uint8_t color, int intensity)
{
  uint8_t r = color & 0b00000111;
  uint8_t g = (color & 0b00111000) >> 3;
  uint8_t b = (color & 0b11000000) >> 6;

  if (intensity >= 0)
  {
    r += intensity;
    r = r > 7 ? 7 : r;

    g += intensity;
    g = g > 7 ? 7 : g;

    b += intensity / 2;
    b = b > 3 ? 3 : b;
  }
  else
  {
    intensity *= -1;
    r = (intensity > r) ? 0 : r - intensity;
    g = (intensity > g) ? 0 : g - intensity;
    intensity /= 2;
    b = intensity > b ? 0 : b - intensity;
  }

  return rgbToIndex(r,g,b);
}

class Sprite
{
public:
  const unsigned char *mImage;
  Vector2D mPosition;
  Unit mHeight;
  Unit mPixelSize;
};

class Character
{
public:
  Camera mCamera;

  Character()
  {
    mCamera.position.x = 7807;//UNITS_PER_SQUARE * 1;
    mCamera.position.y = 18489;//UNITS_PER_SQUARE * 5;
    mCamera.direction = -3550;//200;
    mCamera.fovAngle = UNITS_PER_SQUARE / 4;
    mCamera.height = UNITS_PER_SQUARE * 3;
    mCamera.resolution.x = 110 / SUBSAMPLE;
    mCamera.resolution.y = 88;
    mCamera.shear = 0;

    mCamera.collisionRadius = UNITS_PER_SQUARE / 4;
    mCamera.collisionHeightBelow = UNITS_PER_SQUARE;
    mCamera.collisionHeightAbove = UNITS_PER_SQUARE / 3;
    mCamera.collisionStepHeight = UNITS_PER_SQUARE / 2;
  } 
};

Character player;
Sprite sprites[SPRITES];

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;
}

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 = p.display.screenbuffer;

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

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

  *buf = c;
}

unsigned short pal[256];

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;
  }

p.display.setColor(rgbToIndex(7,7,3));
p.display.setCursor(1,1);
p.display.print(player.mCamera.position.x);
p.display.print(" ");
p.display.print(player.mCamera.position.y);
p.display.print(" ");
p.display.print(player.mCamera.direction);

}

int main()
{
  translaprentColor = rgbToIndex(7,0,0);

  #define placeSprite(S,I,X,Y,Z,P)\
    sprites[I].mImage = S;\
    sprites[I].mPosition.x = X * UNITS_PER_SQUARE + UNITS_PER_SQUARE / 2;\
    sprites[I].mPosition.y = Y * UNITS_PER_SQUARE + UNITS_PER_SQUARE / 2;\
    sprites[I].mHeight = Z * UNITS_PER_SQUARE + UNITS_PER_SQUARE / 2;\
    sprites[I].mPixelSize = P;

  placeSprite(sprite1,0,10,5,1,100)
  placeSprite(sprite1,1,14,5,1,100)
  placeSprite(sprite2,2,15,19,1,200)

  #undef placeSprite

  p.begin();

  for (uint8_t r = 0; r < 8; ++r)
    for (uint8_t g = 0; g < 8; ++g)
      for (uint8_t b = 0; b < 4; ++b)
        pal[rgbToIndex(r,g,b)] = p.display.RGBto565(36 * r, 36 * g, 85 * b);

  p.display.load565Palette(&pal[0]); // load a palette the same way as any other palette in any other screen mode
  p.display.persistence = 1;
  p.setFrameRate(60);
  p.display.setFont(fontTiny);

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

      int16_t step = max(1,UNITS_PER_SQUARE / (p.bBtn() ? 7 : 15));
      const int16_t step2 = max(UNITS_PER_SQUARE / 40,1);

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

      Vector2D moveOffset;
      Unit heightOffset = -100;
 
      moveOffset.x = 0;
      moveOffset.y = 0;

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

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

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

      if (p.upBtn())
      {
        if (strafe)
          heightOffset = step;
        else if (lookUpDown)
          player.mCamera.shear = min(player.mCamera.shear + 10,60);
        else
          moveOffset = d;
      }
      else if (p.downBtn())
      {
        if (strafe)
          heightOffset = -step;
        else 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 (p.rightBtn())
        addition = 1;      
      else if (p.leftBtn())
        addition = -1;

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

        moveOffset = d;
      }
      else
        player.mCamera.direction += addition * step2;
    
      moveCameraWithCollision(&player.mCamera,moveOffset,heightOffset,
        floorHeightAt, ceilingHeightAt);
    }
  }

  return 0;
}