UwUGL/mapper.cpp

#pragma once

#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "datatypes.cpp"
#include "helpers.cpp"

namespace UwU {
  class Mapper {
    public:
    Mapper(Vec2 offset, Vec2 origin, Matrix4 transformation) {
      this->offset = offset;
      this->origin = origin;
      this->transformation = transformation;
    }
    Vec2 offset;             // offset (translation)
    Vec2 origin;           // origin (for rotation, etc)
    Matrix4 transformation;  // transformation matrix (for rotation, translation, etc)

    Coord2 map(Coord2 input) {
      int64_t x1 = (int64_t)transformation.xx * ((int64_t)input.x - (int64_t)origin.x);
      x1 +=        (int64_t)transformation.xy * ((int64_t)input.y - (int64_t)origin.y);
      x1 = x1 / 65536;
      x1 += origin.x;
      x1 += offset.x;
      int64_t y1 = (int64_t)transformation.yx * ((int64_t)input.x - (int64_t)origin.x);
      y1 +=        (int64_t)transformation.yy * ((int64_t)input.y - (int64_t)origin.y);
      y1 = y1 / 65536;
      y1 += origin.y;
      y1 += offset.y;
      return Coord2((uint16_t)x1, (uint16_t)0);
    }
  };
}