Pokitto-Raycasting/game.cpp

/**
  WIP raycasting demo for Pokitto.

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

//#define RAYCAST_TINY

#include <stdio.h>
#include "raycastlib.h"
#include "Pokitto.h"
#include <stdlib.h>

class Level
{
public:
  int16_t getHeight(int16_t x, int16_t y)
  {
    if (x > 12 || y > 12)
      return max(x,y) - 10;

    if (y < 5 && y > 0)
    {
      return y > 2 ? x : -x;
    }

    return (x < 0 || y < 0 || x > 9 || y > 9) ? 4 : 0;
  }
};

class Character
{
public:
  Camera mCamera;

  Character()
  {
    mCamera.position.x = UNITS_PER_SQUARE * 4;
    mCamera.position.y = UNITS_PER_SQUARE * 5;
    mCamera.direction = 0;
    mCamera.fovAngle = UNITS_PER_SQUARE / 4;
    mCamera.height = UNITS_PER_SQUARE / 2;
    mCamera.resolution.x = 36;
    mCamera.resolution.y = 88;
  } 
};

Pokitto::Core p;
Character player;
Level level;

Unit heightFunc(int16_t x, int16_t y)
{
  return level.getHeight(x,y) * UNITS_PER_SQUARE / 4;
}

bool dither(uint8_t intensity, uint32_t x, uint32_t y)
{
  switch (intensity)
  {
    case 0: return false; break;
    case 1: return x % 2 == 0 && y % 2 == 0; break;
    case 2: return x % 2 == y % 2; break;
    case 3: return x % 2 != 0 || y % 2 != 0; break;
    default: return true; break;
  }
}

inline void pixelFunc(PixelInfo pixel)
{
  uint8_t c = 3 + (pixel.isWall == 0 ? 12 : (pixel.hit.direction * 3));

  Unit depth = pixel.depth - UNITS_PER_SQUARE;

  if (depth < 0)
    depth = 0; 

  int16_t d = depth / (UNITS_PER_SQUARE * 4);

  if (d < 0)
    d = 0;

  if (d <= 2)
    c -= d;
  else
    c = 0;

  //c -= min(2,pixel.depth / UNITS_PER_SQUARE);

  uint8_t *buf = p.display.screenbuffer;

  buf += pixel.position.x * 3;
  buf += pixel.position.y * p.display.width;
  *buf++ = c;
  *buf++ = c;
  *buf = c;
}

unsigned short pal[256];

void draw()
{
/*
uint8_t a = 0;
for (uint8_t j = 0; j < 88; ++j)
for (uint8_t i = 0; i < 110; ++i)
{
p.display.drawPixel(i,j,a);
++a;
}
return;
*/
  RayConstraints c;

  c.maxHits = 16;
  c.maxSteps = 16;

  render(player.mCamera,heightFunc,pixelFunc,c);
}

int main()
{
  p.begin();

/*
        int a,s,r,g,b;
        for(a=0; a<=63; a++){
                s = 0;  r = a;          g = 63-a;       b = 0;          pal[a+s] = p.display.RGBto565(r*4,g*4,b*4);
                s = 64; r = 63-a;       g = 0;          b = a;          pal[a+s] = p.display.RGBto565(r*4,g*4,b*4);
                s = 128; r = 0;         g = 0;          b = 63-a;       pal[a+s] = p.display.RGBto565(r*4,g*4,b*4);
                s = 192; r = 0;         g = a;          b = 0;          pal[a+s] = p.display.RGBto565(r*4,g*4,b*4);
        }


for (int i = 0; i < 16; ++i)
pal[i] = p.display.RGBto565(255-i,255-i,255-i);
*/

pal[0] = p.display.RGBto565(0,0,0);
pal[1] = p.display.RGBto565(64,0,0);
pal[2] = p.display.RGBto565(128,0,0);
pal[3] = p.display.RGBto565(192,0,0);
pal[4] = p.display.RGBto565(0,64,0);
pal[5] = p.display.RGBto565(0,128,0);
pal[6] = p.display.RGBto565(0,192,0);
pal[7] = p.display.RGBto565(0,0,64);
pal[8] = p.display.RGBto565(0,0,128);
pal[9] = p.display.RGBto565(0,0,192);
pal[10] = p.display.RGBto565(64,64,0);
pal[11] = p.display.RGBto565(128,128,0);
pal[12] = p.display.RGBto565(192,192,0);
pal[13] = p.display.RGBto565(64,64,64);
pal[14] = p.display.RGBto565(128,128,128);
pal[15] = p.display.RGBto565(192,192,192);


  p.display.load565Palette(&pal[0]); // load a palette the same way as any other palette in any other screen mode

  p.setFrameRate(60);

  p.display.setFont(fontTiny);

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

      const int16_t step = max(UNITS_PER_SQUARE / 10,1);
      const int16_t step2 = max(UNITS_PER_SQUARE / 50,1);

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

      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;
      }

      if (p.upBtn())
      {
        player.mCamera.position.x += d.x;
        player.mCamera.position.y += d.y;
      }
      else if (p.downBtn())
      {
        player.mCamera.position.x -= d.x;
        player.mCamera.position.y -= d.y;
      }

      if (p.rightBtn())
        player.mCamera.direction += step2;
      else if (p.leftBtn())
        player.mCamera.direction -= step2;

      if (p.aBtn())
        player.mCamera.height += step;
      else if (p.bBtn())
        player.mCamera.height -= step;

      player.mCamera.height =
        max(heightFunc(player.mCamera.position.x / UNITS_PER_SQUARE,player.mCamera.position.y / UNITS_PER_SQUARE) + UNITS_PER_SQUARE / 2,player.mCamera.height);
    }
  }

  return 0;
}