tile_region.hpp

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/* Copyright (c) 2025 Otto Link. Distributed under the terms of the GNU General
   Public License. The full license is in the file LICENSE, distributed with
   this software. */
 
#pragma once
#include <string>
 
#include <glm/vec2.hpp>
#include <glm/vec4.hpp>
 
#include "highmap/algebra.hpp"
 
namespace hmap
{
 
struct TileKey
{
  int tx;
  int ty;
 
  bool operator==(const TileKey &other) const
  {
    return tx == other.tx && ty == other.ty;
  }
 
  unsigned int hash() const
  {
    return (static_cast<uint64_t>(tx) << 32) | (static_cast<uint32_t>(ty));
  }
};
 
struct TileRegion
{
  TileKey    key;   // ID
  glm::vec4  bbox;  // (x1, x2, y1, y2) in arbitrary coordinates
  glm::ivec2 shape; // number of cells in tile (incl. halo)
  glm::ivec4 halo;  // number of extra cells around overlapping with other
                    // tiles
 
  TileRegion(const TileKey    &key,
             const glm::vec4  &bbox,
             const glm::ivec2 &shape,
             const glm::vec4  &halo = {0, 0, 0, 0});
 
  glm::vec2   cell_center(int i, int j) const;
  glm::vec2   cell_corner(int i, int j) const;
  std::string key_as_string() const;
};
 
} // namespace hmap