diff --git a/README.md b/README.md
index b9e51e3..6003d72 100644
--- a/README.md
+++ b/README.md
@@ -56,7 +56,7 @@ interface.
 how to use
 ----------
 
-For start take a look at the [testTerminal.c](https://gitlab.com/drummyfish/raycastlib/blob/master/testTerminal.c) program.
+For start take a look at the [testTerminal.c](https://gitlab.com/drummyfish/raycastlib/blob/master/programs/testTerminal.c) program.
 It is only a little bit more complex than a simple hello world.
 
 For more examples see the other files, plus my [Pokitto demos](https://gitlab.com/drummyfish/Pokitto-Raycasting) repository,
@@ -94,4 +94,4 @@ TODO
 license
 -------
 
-Everything is CC0 1.0 + a waiver of all other IP rights (including patents). Please share your own software as free and open-source.
\ No newline at end of file
+Everything is CC0 1.0 + a waiver of all other IP rights (including patents). Please share your own software as free and open-source.
diff --git a/programs/make.sh b/programs/make.sh
new file mode 100755
index 0000000..6e5b564
--- /dev/null
+++ b/programs/make.sh
@@ -0,0 +1,5 @@
+#!/bin/bash
+
+PROGRAM=testSDL
+
+clear; clear; g++ -x c -g -fmax-errors=5 -pedantic -Wall -Wextra -o $PROGRAM $PROGRAM.c -lSDL2 2>&1 >/dev/null && ./$PROGRAM
diff --git a/programs/test.c b/programs/test.c
new file mode 100644
index 0000000..b098fda
--- /dev/null
+++ b/programs/test.c
@@ -0,0 +1,396 @@
+/**
+  Tests for raycastlib.
+
+  license: CC0
+*/
+
+#define RCL_PROFILE
+
+#define RCL_HORIZONTAL_FOV RCL_UNITS_PER_SQUARE / 2
+
+#define RCL_PIXEL_FUNCTION pixelFunc
+
+#include <stdio.h>
+#include "../raycastlib.h"
+#include <sys/time.h>
+
+RCL_Unit testArrayFunc(int16_t x, int16_t y)
+{
+  if (x > 12 || y > 12)
+    return x * y * RCL_UNITS_PER_SQUARE;
+
+  return (x < 0 || y < 0 || x > 9 || y > 9) ? RCL_UNITS_PER_SQUARE : 0;
+}
+
+RCL_Unit testArrayFunc2(int16_t x, int16_t y)
+{
+  return testArrayFunc(x,y) + 10 * RCL_UNITS_PER_SQUARE;
+}
+
+/**
+  Simple automatic test function.
+*/
+
+int testSingleRay(RCL_Unit startX, RCL_Unit startY, RCL_Unit dirX, RCL_Unit dirY,
+  int16_t expectSquareX, int16_t expectSquareY, int16_t expectPointX,
+  int16_t expectPointY, int16_t tolerateError)
+{
+  RCL_Ray r;
+
+  r.start.x     = startX;
+  r.start.y     = startY;
+  r.direction.x = dirX;
+  r.direction.y = dirY;
+
+  printf("- casting ray:\n");
+  RCL_logRay(r);
+
+  RCL_HitResult h = RCL_castRay(r,testArrayFunc);
+  
+  printf("- result:\n");
+  RCL_logHitResult(h);
+
+  int result = 
+    h.square.x   == expectSquareX &&
+    h.square.y   == expectSquareY &&
+    h.position.x <= expectPointX + tolerateError &&
+    h.position.x >= expectPointX - tolerateError &&
+    h.position.y <= expectPointY + tolerateError &&
+    h.position.y >= expectPointY - tolerateError;
+
+  if (result)
+    printf("\nOK\n\n");
+  else
+    printf("\nFAIL\n\n");
+
+  return result;
+}
+
+int testSingleMapping(RCL_Unit posX, RCL_Unit posY, RCL_Unit posZ, uint32_t resX,
+  uint32_t resY, RCL_Unit camX, RCL_Unit camY, RCL_Unit camZ, RCL_Unit camDir,
+  RCL_Unit expectX, RCL_Unit expectY, RCL_Unit expectZ)
+{
+  int result;
+
+  RCL_Camera c;
+
+  c.resolution.x = resX;
+  c.resolution.y = resY;
+  c.position.x = camX;
+  c.position.y = camY;
+  c.direction = camDir;
+  c.height = camZ;
+
+  RCL_Vector2D pos;
+  RCL_Unit height;
+
+  pos.x = posX;
+  pos.y = posY;
+  height = posZ;
+ 
+  RCL_PixelInfo p;
+
+  printf("- mapping pixel: %d %d %d\n",posX,posY,posZ);
+
+  p = RCL_mapToScreen(pos,height,c);
+
+  printf("- result:\n");
+  RCL_logPixelInfo(p);
+
+  result = p.position.x == expectX && p.position.y == expectY &&
+    p.depth == expectZ;
+
+  if (result)
+    printf("\nOK\n\n");
+  else
+    printf("\nFAIL\n\n");
+
+  return result;
+}
+
+// returns milliseconds
+long measureTime(void (*func)(void))
+{
+  long start, end;
+  struct timeval timecheck;
+
+  gettimeofday(&timecheck, NULL);
+  start = (long) timecheck.tv_sec * 1000 + (long) timecheck.tv_usec / 1000;
+
+  func();
+
+  gettimeofday(&timecheck, NULL);
+  end = (long) timecheck.tv_sec * 1000 + (long) timecheck.tv_usec / 1000;
+
+  return end - start;
+}
+
+void benchCastRays()
+{
+  RCL_Ray r;
+
+  r.start.x = RCL_UNITS_PER_SQUARE + RCL_UNITS_PER_SQUARE / 2;
+  r.start.y = 2 * RCL_UNITS_PER_SQUARE + RCL_UNITS_PER_SQUARE / 4;
+
+  RCL_Vector2D directions[8];
+
+  for (int i = 0; i < 8; ++i)
+    directions[i] = RCL_angleToDirection(RCL_UNITS_PER_SQUARE / 8 * i);
+
+  for (int i = 0; i < 1000000; ++i)
+  {
+    r.direction = directions[i % 8];
+    RCL_castRay(r,testArrayFunc);
+  }
+}
+
+void benchmarkMapping()
+{
+  RCL_Camera c;
+
+  c.resolution.x = 1024;
+  c.resolution.y = 768;
+  c.position.x = RCL_UNITS_PER_SQUARE / 2;
+  c.position.y = RCL_UNITS_PER_SQUARE * 2;
+  c.direction = RCL_UNITS_PER_SQUARE / 8;
+  c.height = 0;
+
+  RCL_PixelInfo p;
+
+  RCL_Vector2D pos;
+  RCL_Unit height;
+
+  pos.x = -1024 * RCL_UNITS_PER_SQUARE;
+  pos.y = -512 * RCL_UNITS_PER_SQUARE;
+  height = 0;
+ 
+  for (int i = 0; i < 1000000; ++i)
+  {
+    p = RCL_mapToScreen(pos,height,c);
+
+    pos.x += 4;
+    pos.y += 8;
+    height = (height + 16) % 1024;
+  }
+}
+
+int countPixels = 0;
+uint32_t *pixelCounts = 0;
+RCL_Camera countCamera;
+int countOK = 1;
+
+void pixelFunc(RCL_PixelInfo *p)
+{
+  if (countPixels)
+  {
+    if (p->position.x >= countCamera.resolution.x || p->position.x < 0 ||
+        p->position.y >= countCamera.resolution.y || p->position.y < 0)
+    {
+      printf("ERROR: writing pixel outside screen at %d %d!\n",
+        p->position.x,p->position.y);
+   
+      countOK = 0;
+    }
+    else
+      pixelCounts[p->position.y * countCamera.resolution.x + p->position.x]++;
+  }
+}
+
+int testPixelCount(RCL_Unit camX, RCL_Unit camY, RCL_Unit camZ,
+  RCL_Unit camDir, RCL_Unit camShear, uint16_t camResX, uint16_t camResY,
+  int complexRender)
+{
+  printf("Counting rendered pixels...\n");
+
+  RCL_RayConstraints constraints;
+  RCL_Camera c;
+
+  RCL_initRayConstraints(&constraints);
+  constraints.maxSteps = 32;
+  RCL_initCamera(&c);
+  c.position.x = camX;
+  c.position.y = camY;
+  c.direction = camDir;
+  c.shear = camShear;
+  c.height = camZ;
+  c.resolution.x = camResX;
+  c.resolution.y = camResY;
+
+  uint32_t pixels[camResX * camResY];
+
+  for (int32_t i = 0; i < camResX * camResY; ++i)
+    pixels[i] = 0;
+
+  pixelCounts = pixels;
+  countCamera = c;
+  countPixels = 1;
+
+  countOK = 1;
+
+  if (complexRender)
+    RCL_renderComplex(c,testArrayFunc,testArrayFunc2,0,constraints);
+  else
+    RCL_renderSimple(c,testArrayFunc,0,0,constraints);
+
+  for (uint32_t y = 0; y < camResY; ++y)
+    for (uint32_t x = 0; x < camResX; ++x)
+    {
+      uint32_t index = y * camResX + x;
+
+      if (pixels[index] != 1)
+      {
+        printf("ERROR: pixel at %d %d written %d times!\n",x,y,pixels[index]);
+        countOK = 0;
+      }
+    }
+
+  return countOK;
+}
+
+void benchmarkRender()
+{
+  RCL_Camera c;
+
+  c.resolution.x = 640;
+  c.resolution.y = 300;
+  c.position.x = 10;
+  c.position.y = 12;
+  c.direction = 100;
+  c.height = 200;
+
+  RCL_RayConstraints constraints;
+
+  constraints.maxHits = 10;
+  constraints.maxSteps = 12;
+
+  countPixels = 0;
+
+  for (int i = 0; i < 100; ++i)
+    RCL_renderComplex(c,testArrayFunc,testArrayFunc2,0,constraints);
+}
+
+int main()
+{
+  printf("Testing raycastlib.\n"); 
+
+  if (!testSingleRay(
+    3 * RCL_UNITS_PER_SQUARE + RCL_UNITS_PER_SQUARE / 2,
+    4 * RCL_UNITS_PER_SQUARE + RCL_UNITS_PER_SQUARE / 2,
+    100, 50,
+    10, 7,
+    10240, 7936,
+    16))
+    return 1; 
+
+  if (!testSingleRay(
+    0,
+    0,
+    100, 100,
+    9, 10,
+    10240, 10240,
+    16))
+    return 1; 
+
+  if (!testSingleRay(
+    400,
+    6811,
+    -629,805,
+    -1, 7,
+    -1, 7325,
+    16))
+    return 1;
+
+  if (!testSingleRay(
+    -4 * RCL_UNITS_PER_SQUARE - RCL_UNITS_PER_SQUARE / 2,
+    7 * RCL_UNITS_PER_SQUARE + RCL_UNITS_PER_SQUARE / 3,
+    100,-100,
+    0, 2,
+    1, 2900,
+    16))
+    return 1;
+
+  printf("testing perspective scale...\n");
+
+  for (RCL_Unit i = 1; i < 100; ++i)
+  {
+    RCL_Unit size = i * 3;
+    RCL_Unit distance = i * 6 + 200;
+
+    RCL_Unit scaled = RCL_perspectiveScale(size,distance);
+    RCL_Unit distance2 = RCL_perspectiveScaleInverse(size,scaled);
+
+    if (RCL_absVal(distance - distance2 > 2))
+      printf("ERROR: distance: %d, distance inverse: %d\n",distance,distance2);
+  }
+
+  printf("OK\n");
+
+  if (!testPixelCount(
+    RCL_UNITS_PER_SQUARE / 2,
+    RCL_UNITS_PER_SQUARE / 2,
+    RCL_UNITS_PER_SQUARE / 2,
+    0,
+    0,
+    128,
+    64,
+    1))
+    return 1;
+
+  if (!testPixelCount(
+    3 * RCL_UNITS_PER_SQUARE + 100,
+    4 * RCL_UNITS_PER_SQUARE + RCL_UNITS_PER_SQUARE / 3,
+    RCL_UNITS_PER_SQUARE / 2,
+    512,
+    0,
+    120,
+    60,
+    0))
+    return 1;
+
+  if (!testPixelCount(
+    - RCL_UNITS_PER_SQUARE,
+    0,
+    300,
+    -600,
+    -120,
+    64,
+    68,
+    1))
+    return 1;
+
+  printf("OK\n");
+
+/*
+  if (!testSingleMapping(
+    -RCL_UNITS_PER_SQUARE,
+    0,
+    RCL_UNITS_PER_SQUARE / 2,
+    1280,
+    640,
+    0,
+    0,
+    0,
+    RCL_UNITS_PER_SQUARE / 2,
+    640,
+    0,
+    1024
+    ))
+    return -1;
+*/
+  printf("benchmark:\n");
+
+  long t;
+  t = measureTime(benchCastRays);
+  printf("cast 1000000 rays: %ld ms\n",t);
+
+  t = measureTime(benchmarkMapping);
+  printf("map point to screen 1000000 times: %ld ms\n",t);
+
+  t = measureTime(benchmarkRender);
+  printf("render 100 times: %ld ms\n",t);
+
+  printf("\n"); 
+  printProfile();
+
+  return 0;
+}
diff --git a/programs/testSDL.c b/programs/testSDL.c
new file mode 100644
index 0000000..dee57d4
--- /dev/null
+++ b/programs/testSDL.c
@@ -0,0 +1,723 @@
+/*
+  Raycasting SDL test. This is a port of my Pokitto demo.
+
+  author: Miloslav Ciz
+  license: CC0
+*/
+
+#include <SDL2/SDL.h>
+#include <stdio.h>
+#include <time.h>
+
+#define RCL_COMPUTE_FLOOR_TEXCOORDS 1
+#define RCL_HORIZONTAL_FOV (RCL_UNITS_PER_SQUARE / 5)
+#define RCL_VERTICAL_FOV RCL_UNITS_PER_SQUARE // redefine camera vertical FOV
+
+#define RCL_PIXEL_FUNCTION pixelFunc 
+
+#include "../raycastlib.h"
+
+#define LEVEL_X_RES 29
+#define LEVEL_Y_RES 21
+
+#define SCREEN_WIDTH 800
+#define SCREEN_HEIGHT 600
+#define MIDDLE_ROW (SCREEN_HEIGHT / 2)
+
+#define max(a,b) ((a) > (b) ? (a) : (b))
+
+#define KEYS 8
+#define KEY_UP 0
+#define KEY_RIGHT 1
+#define KEY_DOWN 2
+#define KEY_LEFT 3
+#define KEY_Q 4
+#define KEY_W 5
+#define KEY_A 6
+#define KEY_S 7
+
+int keys[KEYS];
+
+unsigned long frame = 0;
+
+RCL_Camera camera;
+
+uint32_t pixels[SCREEN_WIDTH * SCREEN_HEIGHT];
+uint32_t pixelCounter[SCREEN_WIDTH * SCREEN_HEIGHT];
+
+typedef struct
+{
+  unsigned char *mImage;
+  RCL_Vector2D mPosition;
+  RCL_Unit mHeight;
+  RCL_Unit mPixelSize;
+} Sprite;
+
+uint32_t palette[256];
+
+#define SPRITES 7
+#define SPRITE_MAX_DISTANCE 5 * RCL_UNITS_PER_SQUARE
+
+// For each level square says the texture index.
+const unsigned char levelTexture[] =
+{
+// 0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28
+   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, // 0   20
+   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   19
+   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, // 2   18
+   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, // 3   17
+   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, // 4   16
+   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, // 5   15
+   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, // 6   14
+   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, // 7   13
+   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, // 8   12
+   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, // 9   11
+   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, // 10  10
+   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, // 11  9
+   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, // 12  8
+   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, // 13  7
+   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, // 14  6
+   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, // 15  5
+   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, // 16  4
+   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, // 17  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, // 18  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, // 19  1
+   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  // 20  0
+};
+
+// For each level square says the floor height.
+const signed char levelFloor[] =
+{
+// 0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28
+  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, // 0  20
+  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, // 1  19
+  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, // 2  18
+  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, // 3  17
+  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, // 4  16
+  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, // 5  15
+  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, // 6  14
+  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, // 7  13
+  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, // 8  12
+  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, // 9  11
+  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, // 10 10
+  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, // 11 9
+  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, // 12 8
+  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, // 13 7
+  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, // 14 6
+  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, // 15 5
+  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, // 16 4
+  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, // 17 3
+   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, // 18 2
+   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, // 19 1
+   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  // 20 0
+};
+
+#define XX 127 // helper to keep a big number two-characters, for formatting
+
+// For each level square says the ceiling height.
+const signed char levelCeiling[] =
+{
+// 0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28
+  40,40,40,40,40,40,40,XX,XX,XX,XX,36,40,40,40,40,40,36,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX, // 0  20
+  40,50,50,50,45,40,20,XX,XX,XX,XX,36,40,30,30,30,XX,36,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX, // 1  19
+  40,50,50,50,45,40,20,XX,XX,XX,XX,36,40,30,30,30,XX,36,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX, // 2  18
+  40,50,50,50,45,40,48,XX,XX,XX,XX,36,24,24,24,24,24,36,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX, // 3  17
+  40,50,48,48,48,48,47,XX,XX,XX,XX,36,36,36,36,36,36,36,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX, // 4  16
+  40,50,48,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX, // 5  15
+  40,50,48,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX, // 6  14
+  40,50,48,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX, // 7  13
+  40,50,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX, // 8  12
+  40,40,16,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX, // 9  11
+  40,30,16,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX, // 10 10
+  40,25,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX, // 11 9
+  40,20,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX, // 12 8
+  40,18,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,24,24,24,24,24,24, // 13 7
+  40,18,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,24,24,24,24,24,24, // 14 6
+  40,18,16,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,24,24,25,27,29,24, // 15 5
+  40,18,16,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,24,24,25,27,29,24, // 16 4
+  40,24,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,24,24,25,27,29,24, // 17 3
+  XX,24,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,24,24,25,27,29,24, // 18 2
+  XX,24,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,24,24,25,27,29,24, // 19 1
+  XX,24,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,24,24,24,24,24,24  // 20 0
+};
+
+#undef XX
+
+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
+  ,0x12,0x64,0x52,0x5b,0x5b,0x5b,0x5b,0x09,0x12,0x6d,0x12,0x5b,0x12,0x52
+  ,0x5b,0x52,0x09,0x5a,0x09,0x51,0x09,0x09,0x09,0x09,0x09,0x5c,0x64,0x6d
+  ,0x1b,0x24,0x64,0x08,0x12,0x64,0x5b,0x52,0x5b,0x5b,0x52,0x09,0x00,0x5b
+  ,0x5b,0x52,0x11,0x5b,0x12,0x09,0x08,0x5b,0x5a,0x09,0x51,0x52,0x12,0x08
+  ,0x00,0x5b,0x5b,0x11,0x5b,0x5b,0x5b,0x08,0x09,0x5b,0x12,0x52,0x52,0x09
+  ,0x09,0x09,0x00,0x6d,0x5b,0x52,0x52,0x12,0x12,0x09,0x08,0x11,0x00,0x49
+  ,0x09,0x00,0x09,0x00,0x00,0x6d,0x12,0x5b,0x52,0x5b,0x52,0x09,0x00,0x00
+  ,0x09,0x09,0x12,0x00,0x12,0x00,0x00,0x64,0x52,0x5b,0x52,0x5b,0x52,0x09
+  ,0x09,0x00,0x00,0x00,0x00,0x09,0x00,0x00,0x00,0x64,0x52,0x5b,0x5b,0x52
+  ,0x52,0x09
+};
+
+const unsigned char texture2[] =
+{  32, 32 // width, height
+  ,0x65,0x1d,0x01,0x1c,0x12,0x0a,0x01,0x13,0x14,0x6e,0x2e,0x0b,0x1c,0x1d
+  ,0x2e,0x1d,0x13,0x0b,0x13,0x65,0x1d,0x1d,0x13,0x66,0x6f,0x6e,0x65,0x6f
+  ,0x77,0x7f,0x6f,0x6f,0x1d,0x14,0x13,0x6e,0x6e,0x66,0x6f,0x77,0x77,0x6f
+  ,0x66,0x66,0x13,0x25,0x0a,0x01,0x6e,0x66,0x01,0x12,0x02,0x01,0x1b,0x6e
+  ,0x77,0x77,0x77,0x77,0x77,0x6f,0x6f,0x6e,0x1c,0x1d,0x1c,0x77,0x67,0x6f
+  ,0x6f,0x77,0x67,0x77,0x77,0x66,0x13,0x0a,0x14,0x77,0x66,0x6f,0x77,0x66
+  ,0x1b,0x13,0x66,0x77,0x6f,0x77,0x6f,0x6f,0x6f,0x26,0x6e,0x1d,0x25,0x14
+  ,0x13,0x6e,0x6f,0x6f,0x77,0x6f,0x77,0x77,0x77,0x1d,0x1d,0x01,0x25,0x67
+  ,0x7f,0x6f,0x6f,0x66,0x66,0x14,0x66,0x6f,0x7f,0x6f,0x77,0x6f,0x1d,0x25
+  ,0x1d,0x66,0x1d,0x65,0x14,0x2e,0x26,0x77,0x6d,0x67,0x6f,0x25,0x6f,0x5e
+  ,0x5d,0x0b,0x5d,0x6f,0x6f,0x26,0x1d,0x77,0x66,0x1c,0x13,0x6f,0x6f,0x6f
+  ,0x66,0x67,0x66,0x65,0x6e,0x1c,0x1b,0x0a,0x01,0x1d,0x65,0x1e,0x6f,0x6e
+  ,0x67,0x66,0x66,0x65,0x14,0x1c,0x25,0x65,0x6e,0x66,0x66,0x6e,0x66,0x1c
+  ,0x02,0x1d,0x77,0x6e,0x77,0x66,0x25,0x13,0x5c,0x1d,0x0a,0x14,0x0b,0x14
+  ,0x6e,0x65,0x1d,0x66,0x1d,0x66,0x1d,0x66,0x14,0x25,0x14,0x6e,0x66,0x25
+  ,0x66,0x5d,0x66,0x25,0x0a,0x6e,0x6f,0x6f,0x6e,0x1d,0x13,0x65,0x5c,0x01
+  ,0x0a,0x15,0x1d,0x0a,0x01,0x5d,0x6e,0x5c,0x25,0x1d,0x1e,0x26,0x1d,0x1b
+  ,0x14,0x25,0x25,0x1d,0x14,0x1d,0x14,0x13,0x01,0x25,0x6e,0x25,0x25,0x25
+  ,0x1d,0x1c,0x01,0x0a,0x14,0x14,0x5d,0x14,0x14,0x0a,0x1d,0x5d,0x1c,0x6e
+  ,0x1d,0x65,0x5d,0x1d,0x0a,0x01,0x14,0x1c,0x25,0x0a,0x01,0x12,0x1c,0x0b
+  ,0x01,0x1c,0x14,0x25,0x0b,0x1b,0x25,0x14,0x25,0x02,0x1d,0x25,0x1d,0x09
+  ,0x13,0x1c,0x1d,0x66,0x1d,0x1c,0x0b,0x14,0x0b,0x65,0x2d,0x09,0x0a,0x09
+  ,0x14,0x66,0x6f,0x66,0x66,0x1c,0x0a,0x01,0x0b,0x14,0x66,0x1c,0x1d,0x1c
+  ,0x66,0x66,0x65,0x6e,0x1c,0x09,0x1c,0x1d,0x14,0x1c,0x0b,0x01,0x1d,0x6e
+  ,0x77,0x66,0x1c,0x1c,0x6e,0x6f,0x6f,0x77,0x7f,0x77,0x5e,0x6e,0x6f,0x67
+  ,0x6f,0x6f,0x0a,0x0a,0x66,0x67,0x66,0x25,0x13,0x1c,0x24,0x14,0x25,0x1c
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+  ,0x66,0x25
+};
+
+const unsigned char texture3[] =
+{  32, 32 // width, height
+  ,0xb6,0x3d,0x33,0x33,0x3e,0x33,0x2a,0x29,0x2a,0x29,0x2a,0x20,0x29,0x29
+  ,0x2a,0x29,0x10,0x10,0x10,0x49,0x58,0x99,0x50,0x50,0x10,0x4b,0x54,0x54
+  ,0x55,0x55,0x4a,0x49,0x29,0x3d,0x3d,0x7c,0x3d,0x33,0x34,0x3d,0x33,0x33
+  ,0x33,0x20,0x20,0x29,0x10,0x20,0x10,0x50,0x10,0x49,0x10,0x99,0x51,0x51
+  ,0x33,0x10,0x53,0x66,0x67,0x15,0x54,0x4b,0x7f,0x33,0x7f,0x3d,0x3e,0x3d
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+  ,0x58,0x51,0x51,0x51,0x33,0x33,0x10,0x55,0x5e,0x67,0x26,0x66,0x29,0x7f
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+  ,0x58,0x59,0x50,0x10,0x51,0x51,0x10,0x51,0x52,0x37,0x37,0x10,0x10,0x5d
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+  ,0x67,0x33,0x10,0x10,0xb6,0x3d,0x33,0x7f,0x29,0x3d,0x33,0x33,0x29,0x29
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+  ,0x33,0x10,0x00,0x49,0xb6,0x29,0x3f,0x33,0x33,0x33,0x3d,0x33,0x20,0x2a
+  ,0x33,0x2a,0x29,0x58,0x99,0x10,0x50,0x10,0x10,0x10,0x10,0x99,0x51,0x00
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+  ,0x33,0x3d,0x33,0x3f,0x2a,0x33,0x2a,0x33,0x29,0x10,0x10,0x29,0x10,0x33
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+  ,0x2a,0x20,0x10,0x10,0x10,0x50,0x49,0x58,0x51,0x51,0x58,0x99,0x00,0x00
+  ,0x00,0x00,0x00,0x10,0x33,0x33,0x7f,0x3d,0x33,0x7f,0x3d,0x3d,0x33,0x3d
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+  ,0x10,0x29,0x2a,0x29,0x10,0x20,0x10,0x58,0x58,0x58,0x99,0x51,0x10,0x49
+  ,0x49,0x4a,0x4b,0x53,0x56,0x54,0x4b,0x54,0x6c,0x33,0x3d,0x3d,0x3d,0x33
+  ,0x3d,0x33,0x29,0x33,0x20,0x20,0x20,0x10,0x2a,0x10,0x50,0x99,0x58,0x58
+  ,0x51,0x51,0x51,0x4a,0x4b,0x4b,0x54,0x66,0x67,0x56,0x2e,0x5e,0xb6,0x3d
+  ,0x33,0x7f,0x29,0x3d,0x2a,0x29,0x33,0x29,0x20,0x2a,0x10,0x10,0x2a,0x10
+  ,0x10,0x50,0x10,0x50,0x59,0x51,0x51,0x51,0x51,0x54,0x15,0x66,0x5e,0x15
+  ,0x56,0x54
+};
+
+const unsigned char texture4[] =
+{  32, 32 // width, height
+  ,0x12,0x1c,0x65,0x65,0x65,0x65,0x1c,0x1c,0x1c,0x1c,0x1c,0x1b,0x1b,0x1b
+  ,0x13,0x00,0x5b,0x5b,0xad,0xad,0xad,0xad,0x5b,0x00,0x64,0xad,0xad,0x64
+  ,0x64,0x64,0x5b,0x00,0x1c,0x1b,0x1b,0x1b,0x13,0x13,0x12,0x13,0x12,0x12
+  ,0x12,0x12,0x0a,0x0a,0x09,0x00,0x5b,0x5b,0xad,0xad,0xad,0x64,0x5b,0x00
+  ,0xad,0x64,0x64,0x64,0x64,0x64,0x5b,0x00,0x65,0x1b,0x1b,0x13,0x13,0x12
+  ,0x0a,0x0a,0x12,0x0a,0x0a,0x0a,0x0a,0x09,0x09,0x00,0x5b,0x5b,0xad,0xad
+  ,0xad,0x64,0x5b,0x00,0xad,0x64,0x64,0x64,0x64,0x64,0x5b,0x00,0x65,0x1b
+  ,0x13,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x09,0x0a,0x09,0x00
+  ,0x5b,0x5b,0xad,0xad,0x64,0x64,0x5b,0x00,0x64,0x64,0x64,0x64,0x64,0x64
+  ,0x12,0x00,0x65,0x13,0x12,0x00,0x09,0x09,0x0a,0x09,0x09,0x09,0x09,0x09
+  ,0x13,0x0a,0x09,0x00,0x5b,0x5b,0xad,0x64,0x64,0x5b,0x5b,0x00,0x64,0x64
+  ,0x64,0x64,0x64,0x64,0x5b,0x00,0x65,0x13,0x12,0x00,0x09,0x0a,0x12,0x12
+  ,0x0a,0x12,0x12,0x0a,0x1b,0x0a,0x09,0x00,0x5b,0x5b,0x64,0x64,0x5b,0x64
+  ,0x5b,0x00,0x64,0x64,0x64,0x64,0x64,0x64,0x5b,0x00,0x65,0x12,0x13,0x00
+  ,0x09,0x12,0x0a,0x0a,0x12,0x0a,0x0a,0x0a,0x1c,0x09,0x0a,0x00,0x5b,0x5b
+  ,0x64,0x64,0x64,0x64,0x5b,0x00,0x5b,0x5b,0x5b,0x12,0x5b,0x12,0x5b,0x00
+  ,0x65,0x13,0x12,0x00,0x09,0x12,0x0a,0x0a,0x0a,0x09,0x0a,0x09,0x1c,0x0a
+  ,0x0a,0x00,0x5b,0x5b,0xad,0x64,0x5b,0x64,0x5b,0x00,0x00,0x00,0x00,0x00
+  ,0x00,0x00,0x00,0x00,0x1c,0x12,0x0a,0x00,0x09,0x12,0x0a,0x0a,0x09,0x0a
+  ,0x09,0x09,0x1c,0x0a,0x0a,0x00,0x52,0x52,0x64,0x64,0x64,0x5b,0x5b,0x00
+  ,0xad,0xad,0xad,0xad,0xad,0xad,0x5b,0x00,0x1c,0x12,0x0a,0x00,0x09,0x0a
+  ,0x0a,0x0a,0x09,0x09,0x09,0x09,0x65,0x0a,0x09,0x00,0x5b,0x52,0x64,0x64
+  ,0x5b,0x64,0x5b,0x00,0xad,0xad,0xad,0xad,0xad,0x64,0x5b,0x00,0x1b,0x0a
+  ,0x12,0x00,0x09,0x0a,0x09,0x09,0x0a,0x0a,0x09,0x09,0x65,0x09,0x09,0x00
+  ,0x5b,0x5b,0x5b,0x64,0x5b,0x5b,0x5b,0x00,0xad,0xad,0xad,0xad,0xad,0x64
+  ,0x5b,0x00,0x1b,0x12,0x0a,0x00,0x09,0x0a,0x0a,0x09,0x0a,0x09,0x09,0x0a
+  ,0x1c,0x09,0x09,0x00,0x52,0x12,0x64,0x64,0x64,0x5b,0x5b,0x00,0xad,0xad
+  ,0xad,0xad,0x64,0x64,0x5b,0x00,0x1b,0x0a,0x09,0x09,0x13,0x1b,0x1c,0x1c
+  ,0x65,0x65,0x1c,0x1c,0x1b,0x09,0x09,0x00,0x5b,0x52,0x64,0x64,0x64,0x5b
+  ,0x12,0x00,0xad,0xad,0xad,0x64,0x64,0x5b,0x5b,0x00,0x1b,0x0a,0x09,0x0a
+  ,0x09,0x09,0x09,0x0a,0x09,0x0a,0x09,0x09,0x09,0x09,0x09,0x00,0x12,0x12
+  ,0x5b,0x5b,0x5b,0x5b,0x5b,0x00,0xad,0xad,0x64,0x64,0x5b,0x5b,0x12,0x00
+  ,0x13,0x09,0x09,0x09,0x09,0x09,0x0a,0x0a,0x09,0x09,0x09,0x09,0x09,0x09
+  ,0x09,0x00,0x09,0x09,0x5b,0x12,0x12,0x12,0x12,0x00,0xad,0xad,0x64,0x64
+  ,0x64,0x64,0x5b,0x00,0x0a,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00
+  ,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00
+  ,0xad,0x64,0x64,0x5b,0x5b,0x5b,0x12,0x00,0x12,0x1c,0x65,0x65,0x65,0x65
+  ,0x1c,0x1c,0x1c,0x1c,0x1c,0x1b,0x1b,0x1b,0x13,0x00,0x5b,0x5b,0xad,0x64
+  ,0xad,0xad,0x5b,0x00,0x64,0x64,0x64,0x5b,0x5b,0x64,0x5b,0x00,0x1c,0x1b
+  ,0x1b,0x1b,0x1b,0x13,0x12,0x13,0x12,0x12,0x12,0x12,0x0a,0x0a,0x09,0x00
+  ,0x5b,0x5b,0xad,0xad,0xad,0x64,0x5b,0x00,0xad,0x64,0x5b,0x5b,0x5b,0x5b
+  ,0x5b,0x00,0x65,0x1b,0x1b,0x13,0x13,0x12,0x0a,0x0a,0x12,0x0a,0x0a,0x0a
+  ,0x0a,0x09,0x09,0x00,0x5b,0x5b,0xad,0x64,0x64,0x64,0x5b,0x00,0x64,0x64
+  ,0x64,0x64,0x5b,0x5b,0x5b,0x00,0x65,0x13,0x1b,0x00,0x00,0x00,0x00,0x00
+  ,0x00,0x00,0x00,0x00,0x09,0x0a,0x09,0x00,0x5b,0x5b,0x64,0x64,0x64,0x64
+  ,0x5b,0x00,0x64,0x64,0x64,0x64,0x5b,0x64,0x5b,0x00,0x65,0x1b,0x13,0x00
+  ,0x09,0x09,0x0a,0x09,0x09,0x09,0x09,0x09,0x1b,0x0a,0x09,0x00,0x5b,0x5b
+  ,0xad,0x64,0x5b,0x64,0x5b,0x00,0x64,0x64,0x64,0x64,0x5b,0x5b,0x5b,0x00
+  ,0x65,0x13,0x12,0x00,0x09,0x0a,0x12,0x12,0x0a,0x12,0x12,0x12,0x1b,0x0a
+  ,0x09,0x00,0x5b,0x52,0x64,0x64,0x5b,0x5b,0x5b,0x00,0x64,0x64,0x64,0x64
+  ,0x5b,0x5b,0x12,0x00,0x65,0x12,0x13,0x00,0x09,0x12,0x0a,0x0a,0x0a,0x0a
+  ,0x0a,0x0a,0x1c,0x09,0x0a,0x00,0x5b,0x5b,0x64,0x64,0x5b,0x64,0x5b,0x00
+  ,0x5b,0x5b,0x5b,0x5b,0x5b,0x12,0x5b,0x00,0x65,0x13,0x12,0x00,0x09,0x12
+  ,0x0a,0x0a,0x0a,0x09,0x0a,0x09,0x1c,0x0a,0x0a,0x00,0x5b,0x52,0x64,0x5b
+  ,0x64,0x5b,0x5b,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x1c,0x12
+  ,0x0a,0x00,0x09,0x12,0x0a,0x0a,0x09,0x0a,0x09,0x09,0x1c,0x0a,0x0a,0x00
+  ,0x52,0x5b,0x64,0x64,0x5b,0x5b,0x5b,0x00,0xad,0xad,0xad,0xad,0xad,0xad
+  ,0x5b,0x00,0x1c,0x12,0x0a,0x00,0x09,0x0a,0x0a,0x0a,0x09,0x09,0x09,0x09
+  ,0x65,0x0a,0x09,0x00,0x5b,0x52,0x64,0x64,0x5b,0x5b,0x5b,0x00,0xad,0xad
+  ,0xad,0xad,0xad,0x64,0x5b,0x00,0x1b,0x0a,0x12,0x00,0x09,0x0a,0x09,0x09
+  ,0x0a,0x0a,0x09,0x09,0x65,0x09,0x09,0x00,0x52,0x12,0x64,0x5b,0x5b,0x5b
+  ,0x5b,0x00,0xad,0xad,0xad,0xad,0xad,0x64,0x5b,0x00,0x1b,0x12,0x0a,0x00
+  ,0x09,0x0a,0x0a,0x09,0x0a,0x09,0x09,0x0a,0x1c,0x09,0x09,0x00,0x52,0x52
+  ,0x5b,0x5b,0x5b,0x64,0x5b,0x00,0xad,0xad,0xad,0xad,0x64,0x64,0x5b,0x00
+  ,0x1b,0x0a,0x09,0x09,0x13,0x1b,0x1c,0x1c,0x65,0x65,0x1c,0x1c,0x1b,0x09
+  ,0x09,0x00,0x12,0x12,0x5b,0x5b,0x5b,0x5b,0x5b,0x00,0xad,0xad,0xad,0xad
+  ,0xad,0x64,0x5b,0x00,0x1b,0x0a,0x09,0x0a,0x0a,0x09,0x09,0x09,0x09,0x09
+  ,0x09,0x09,0x09,0x09,0x09,0x00,0x12,0x12,0x5b,0x5b,0x5b,0x5b,0x12,0x00
+  ,0xad,0xad,0xad,0x64,0xad,0x64,0x5b,0x00,0x13,0x09,0x0a,0x09,0x09,0x09
+  ,0x09,0x09,0x09,0x09,0x09,0x09,0x09,0x09,0x09,0x00,0x09,0x12,0x5b,0x5b
+  ,0x5b,0x12,0x5b,0x00,0xad,0xad,0x64,0x64,0xad,0x64,0x5b,0x00,0x0a,0x00
+  ,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00
+  ,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xad,0x64,0xad,0x64,0xad,0x64
+  ,0x12,0x00
+};
+
+const unsigned char *textures[] = {texture1, texture2, texture3, texture4};
+
+void clearScreen()
+{
+  memset(pixels,0,SCREEN_WIDTH * SCREEN_HEIGHT * sizeof(uint32_t));
+}
+
+void clearPixelCounter()
+{
+  memset(pixelCounter,0,SCREEN_WIDTH * SCREEN_HEIGHT * sizeof(uint32_t));
+}
+
+static inline uint8_t rgbToIndex(uint8_t r, uint8_t g, uint8_t b)
+{
+  return (r & 7) | ((g & 7) << 3) | ((b & 7) << 6);
+}
+
+uint8_t sampleImage(const unsigned char *image, RCL_Unit x, RCL_Unit y)
+{
+  x = RCL_wrap(x,RCL_UNITS_PER_SQUARE);
+  y = RCL_wrap(y,RCL_UNITS_PER_SQUARE);
+
+  int32_t index =
+    image[1] * ((image[0] * x) / RCL_UNITS_PER_SQUARE) +
+    (image[0] * y) / RCL_UNITS_PER_SQUARE;
+
+  return image[2 + index];
+}
+
+uint8_t addIntensity(uint8_t color, int16_t intensity)
+{
+  uint8_t r = color & 7;
+  uint8_t g = (color & 56) >> 3;
+  uint8_t b = (color & 172) >> 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);
+}
+
+RCL_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;
+}
+
+RCL_Unit floorHeightAt(int16_t x, int16_t y)
+{
+  if (x == 6 && (y == 13 || y == 14)) // moving lift
+    return ((RCL_absVal(-1 * (frame % 64) + 32)) * RCL_UNITS_PER_SQUARE) / 8; 
+
+  if (x >= 0 && x < LEVEL_X_RES && y >= 0 && y < LEVEL_Y_RES)
+    return (levelFloor[(LEVEL_Y_RES - y -1) * LEVEL_X_RES + x] * RCL_UNITS_PER_SQUARE) / 8; 
+
+  int a = RCL_absVal(x - LEVEL_X_RES / 2) - LEVEL_X_RES / 2;
+  int b = RCL_absVal(y - LEVEL_Y_RES / 2) - LEVEL_Y_RES / 2;
+
+  return (a > b ? a : b) * RCL_UNITS_PER_SQUARE;
+}
+
+RCL_Unit ceilingHeightAt(int16_t x, int16_t y)
+{
+  int v = 1024;
+
+  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 * RCL_UNITS_PER_SQUARE) / 8;
+}
+
+/**
+  Function for drawing a single pixel (like fragment shader). Bottleneck =>
+  should be as fast as possible.
+*/
+void pixelFunc(RCL_PixelInfo *pixel)
+{
+  uint8_t c;
+
+  if (pixel->isWall)
+    c = sampleImage(textures[pixel->hit.type],pixel->texCoords.x,pixel->texCoords.y);
+  else
+    c = pixel->height == RCL_FLOOR_TEXCOORDS_HEIGHT ?
+      sampleImage(textures[0],pixel->texCoords.x,pixel->texCoords.y) : 0b00010001;
+
+  int intensity = pixel->depth - 8 * RCL_UNITS_PER_SQUARE;
+  intensity = intensity < 0 ? 0 : intensity;
+  intensity = (intensity * 32) / RCL_UNITS_PER_SQUARE;
+
+  int32_t color = palette[c];
+
+  int32_t r = ((color & 0xFF000000) >> 24) - intensity;
+  r = r > 0 ? r : 0;
+  r = r << 24;
+
+  int32_t g = ((color & 0x00FF0000) >> 16) - intensity;
+  g = g > 0 ? g : 0;
+  g = g << 16;
+
+  int32_t b = ((color & 0x0000FF00) >> 8) - intensity;
+  b = b > 0 ? b : 0;
+  b = b << 8;
+
+  int32_t index = pixel->position.y * SCREEN_WIDTH + pixel->position.x;
+
+  pixels[index] = r | g | b;
+  pixelCounter[index]++;
+}
+
+void draw()
+{
+  RCL_RayConstraints c;
+
+  c.maxHits = 32;
+  c.maxSteps = 32;
+
+  RCL_renderComplex(camera,floorHeightAt,ceilingHeightAt,textureAt,c);
+}
+
+int main()
+{
+  for (uint8_t r = 0; r < 8; ++r)
+    for (uint8_t g = 0; g < 8; ++g)
+      for (uint8_t b = 0; b < 4; ++b)
+        palette[rgbToIndex(r,g,b)] = ((36 * r) << 24) | ((36 * g) << 16) | ((85 * b) << 8);
+
+  camera.position.x = 11237;
+  camera.position.y = 12392;
+  camera.shear = -50;
+  camera.direction = -415;
+  camera.height = 4648;
+  camera.resolution.x = SCREEN_WIDTH;
+  camera.resolution.y = SCREEN_HEIGHT;
+
+  SDL_Window *window = SDL_CreateWindow("raycasting", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, SCREEN_WIDTH, SCREEN_HEIGHT, SDL_WINDOW_SHOWN); 
+  SDL_Renderer *renderer = SDL_CreateRenderer(window,-1,0);
+  SDL_Texture *texture = SDL_CreateTexture(renderer,SDL_PIXELFORMAT_RGBX8888, SDL_TEXTUREACCESS_STATIC, SCREEN_WIDTH, SCREEN_HEIGHT);
+  SDL_Surface *screenSurface = SDL_GetWindowSurface(window);
+  SDL_Event event;
+
+  int running = 1;
+  int fps = 0;
+
+  clock_t nextT;
+
+  while (running)
+  {
+    draw();
+    fps++; 
+
+    SDL_UpdateTexture(texture,NULL,pixels,SCREEN_WIDTH * sizeof(uint32_t));
+
+    while (SDL_PollEvent(&event))
+    {
+      int newState = 0;
+      int keyIndex = -1;
+
+      switch (event.type)
+      {
+        case SDL_KEYDOWN:
+          newState = 1;
+        case SDL_KEYUP:
+          switch (event.key.keysym.scancode)
+          {
+            case SDL_SCANCODE_ESCAPE: running = 0; break;
+            case SDL_SCANCODE_UP: keyIndex = KEY_UP; break;
+            case SDL_SCANCODE_RIGHT: keyIndex = KEY_RIGHT; break;
+            case SDL_SCANCODE_DOWN: keyIndex = KEY_DOWN; break;
+            case SDL_SCANCODE_LEFT: keyIndex = KEY_LEFT; break;
+            case SDL_SCANCODE_Q: keyIndex = KEY_Q; break;
+            case SDL_SCANCODE_W: keyIndex = KEY_W; break;
+            case SDL_SCANCODE_A: keyIndex = KEY_A; break;
+            case SDL_SCANCODE_S: keyIndex = KEY_S; break;
+            default: break;
+          }
+          break;
+
+        case SDL_QUIT:
+          running = 0;
+          break;
+
+        default:
+          break;
+      }
+
+      if (keyIndex >= 0)
+        keys[keyIndex] = newState;
+    }
+
+    int step = 1;
+    int step2 = 5;
+
+    RCL_Vector2D direction = RCL_angleToDirection(camera.direction);
+
+    direction.x /= 10;
+    direction.y /= 10;
+
+    if (keys[KEY_UP])
+    {
+      camera.position.x += step * direction.x;
+      camera.position.y += step * direction.y;
+    }
+    else if (keys[KEY_DOWN])
+    {
+      camera.position.x -= step * direction.x;
+      camera.position.y -= step * direction.y;
+    }
+
+    if (keys[KEY_Q])
+      camera.height += step * 100;
+    else if (keys[KEY_W])
+      camera.height -= step * 100;
+
+    if (keys[KEY_RIGHT])
+      camera.direction += step2;
+    else if (keys[KEY_LEFT])
+      camera.direction -= step2;
+
+    const int shearAdd = 10;
+
+    if (keys[KEY_A])
+      camera.shear = camera.shear + shearAdd <= SCREEN_HEIGHT ? camera.shear + shearAdd : SCREEN_HEIGHT;
+    else if (keys[KEY_S])
+      camera.shear = camera.shear - shearAdd >= -1 * SCREEN_HEIGHT ? camera.shear - shearAdd : -1 * SCREEN_HEIGHT;
+
+    SDL_RenderClear(renderer);
+    SDL_RenderCopy(renderer,texture,NULL,NULL);
+    SDL_RenderPresent(renderer);
+
+    clock_t nowT = clock();
+
+    double timeDiff = ((double) (nowT - nextT)) / CLOCKS_PER_SEC;
+
+    fps++;
+
+    if (timeDiff >= 1.0)
+    {
+      nextT = nowT;
+      printf("FPS: %d\n",fps);
+      fps = 0;
+    }
+
+    frame++;
+  }
+
+  return 0;
+}
diff --git a/programs/testTerminal.c b/programs/testTerminal.c
new file mode 100644
index 0000000..3178a26
--- /dev/null
+++ b/programs/testTerminal.c
@@ -0,0 +1,148 @@
+/*
+  Raycasting terminal test.
+
+  author: Miloslav Ciz
+  license: CC0
+*/
+
+#define RCL_PIXEL_FUNCTION pixelFunc
+#define RCL_COMPUTE_WALL_TEXCOORDS 0
+#define RCL_COMPUTE_FLOOR_DEPTH 0
+#define RCL_COMPUTE_CEILING_DEPTH 0
+
+#include <stdio.h>
+#include "../raycastlib.h"
+#include <unistd.h>
+#include <stdlib.h>
+
+#define LEVEL_W 20
+#define LEVEL_H 15
+
+#define SCREEN_W 80
+#define SCREEN_H 40
+
+char pixels[SCREEN_W * SCREEN_H];
+RCL_Camera camera;
+
+const int8_t level[LEVEL_W * LEVEL_H] =
+{
+/*                      11  13  15  17  19 
+  0 1 2 3 4 5 6 7 8 9 10  12  14  16  18  */
+  0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,1,0,0, // 0
+  0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,1,0,0, // 1
+  0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,1,1,0,0, // 2
+  1,0,0,0,0,0,0,1,0,0,0,0,1,0,0,0,0,0,0,0, // 3
+  0,0,0,0,0,0,0,0,0,1,0,0,1,1,1,0,0,1,0,0, // 4
+  0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0, // 5
+  1,1,1,0,0,0,0,1,0,0,0,0,0,0,0,0,0,1,0,0, // 6
+  0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,1,0,0,0,0, // 7
+  0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,1,1,1,1,1, // 8
+  0,0,0,0,0,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0, // 9
+  0,0,0,0,0,1,0,0,0,1,0,0,0,0,0,0,0,0,0,1, // 10
+  0,0,0,0,0,1,0,0,0,1,0,0,0,0,1,1,1,0,0,1, // 11
+  0,0,0,0,0,1,0,0,0,0,0,0,0,0,1,0,0,0,0,0, // 12
+  0,0,0,0,0,1,0,0,0,1,1,1,0,0,1,0,0,0,0,0, // 13
+  0,0,0,0,0,1,0,0,0,1,0,0,0,0,1,0,0,0,0,0  // 14
+};
+
+RCL_Unit heightAt(int16_t x, int16_t y)
+{
+  int32_t index = y * LEVEL_W + x;
+
+  if (index < 0 || (index >= LEVEL_W * LEVEL_H))
+    return RCL_UNITS_PER_SQUARE * 2;
+
+  return level[y * LEVEL_W + x] * RCL_UNITS_PER_SQUARE * 2;
+}
+
+void pixelFunc(RCL_PixelInfo *p)
+{
+  char c = ' ';
+
+  if (p->isWall)
+  {
+    switch (p->hit.direction)
+    {
+      case 0:  c = 'X'; break;
+      case 1:  c = '#'; break;
+      case 2:  c = 'o'; break;
+      case 3:
+      default: c = '.'; break;
+    }
+  }
+
+  pixels[p->position.y * SCREEN_W + p->position.x] = c;
+}
+
+void draw()
+{
+  for (int i = 0; i < 15; ++i)
+    printf("\n");
+
+  RCL_RayConstraints c;
+
+  RCL_initRayConstraints(&c);
+
+  c.maxHits = 1;
+  c.maxSteps = 40;
+
+  //RCL_renderSimple(camera,heightAt,0,0,c);
+  RCL_renderComplex(camera,heightAt,0,0,c);
+
+  for (int j = 0; j < SCREEN_H; ++j)
+  {
+    for (int i = 0; i < SCREEN_W; ++i)
+      printf("%c",pixels[j * SCREEN_W + i]);   
+
+    printf("\n");
+  }
+}
+
+int dx = 1;
+int dy = 0;
+int dr = 1;
+int frame = 0;
+
+int main()
+{
+  RCL_initCamera(&camera);
+  camera.position.x = 2 * RCL_UNITS_PER_SQUARE;
+  camera.position.y = 2 * RCL_UNITS_PER_SQUARE;
+  camera.direction = 0;
+  camera.resolution.x = SCREEN_W;
+  camera.resolution.y = SCREEN_H;
+
+  for (int i = 0; i < 10000; ++i)
+  {
+    draw();
+
+    int squareX = RCL_divRoundDown(camera.position.x,RCL_UNITS_PER_SQUARE);
+    int squareY = RCL_divRoundDown(camera.position.y,RCL_UNITS_PER_SQUARE);
+ 
+    if (rand() % 100 == 0)
+    {
+      dx = 1 - rand() % 3;
+      dy = 1 - rand() % 3;
+      dr = 1 - rand() % 3;
+    }
+
+    while (heightAt(squareX + dx,squareY + dy) > 0)
+    {
+      dx = 1 - rand() % 3;
+      dy = 1 - rand() % 3;
+      dr = 1 - rand() % 3;
+    }
+
+    camera.position.x += dx * 200;
+    camera.position.y += dy * 200;
+    camera.direction += dr * 10;
+
+    camera.height = RCL_UNITS_PER_SQUARE + RCL_sinInt(frame * 16) / 2;
+
+    usleep(100000);
+
+    frame++;
+  }
+
+  return 0;
+}