/**
  Raycasting hello world program for Pokitto, using raycastlib.

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

#define RCL_PIXEL_FUNCTION pixelFunc
/* ^ Before including raycastlib, this has to be set to the name of the
     function that will render pixels. It allows super performance. */

/* There are many other options that can be defined here, check the library
   for details. */

#include "raycastlib.h"
#include "Pokitto.h"

Pokitto::Core pokitto;

RCL_Camera camera; // Defines a view that will be rendered.
RCL_RayConstraints constraints;

// Function that for given square coordinates returns height of the floor.
RCL_Unit floorHeightAt(int16_t x, int16_t y)
{
  return x < 0 || x >= 10 || y < 0 || y >= 10 ?
    RCL_UNITS_PER_SQUARE * 2 : 0;
    // ^ RCL_UNITS_PER_SQUARE is the length of one side of the game world square.
}

// Function which the library will call to draw indivifual pixels.
void pixelFunc(RCL_PixelInfo *pixel)
{
  uint8_t color;

  /* Pixel holds all kind of info about the pixel to be rendered. Check
     the PixelInfo struct for details. */

  if (pixel->isWall)
    color = pixel->hit.direction + 2;
  else
    color = pixel->isFloor ? 10 : 11;

  pokitto.display.drawPixel(pixel->position.x,pixel->position.y,color);
}

void draw()
{
  /* This triggers the rendering, which will keep calling pixelFunc to render
     the camera view. */
  RCL_renderSimple(camera,floorHeightAt,0,0,constraints);
}

int main()
{
  pokitto.begin(); 
  pokitto.setFrameRate(60);

  RCL_initCamera(&camera);

  // Set the camera position to square [4;6].
  camera.position.x = 4 * RCL_UNITS_PER_SQUARE;
  camera.position.y = 6 * RCL_UNITS_PER_SQUARE;

  camera.height = RCL_UNITS_PER_SQUARE;

  // Set the camera resolution to Pokitto display resolution.
  camera.resolution.x = 110;
  camera.resolution.y = 88;

  // This specifies the ray behavior.
  constraints.maxHits = 1;
  constraints.maxSteps = 20;

  while (pokitto.isRunning())
  {
    if (pokitto.update())
    {
      draw();
      camera.direction -= 10; // Rotate camera for some animation.
    }
  }

  return 0;
}