texture.hpp

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/* Copyright (c) 2026 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 <vector>
 
#include <opencv2/core.hpp>
 
#include "highmap/algebra.hpp"
#include "highmap/array.hpp"
 
namespace hmap
{
 
class Texture
{
public:
  glm::ivec2 shape = glm::ivec2(0, 0);
 
  std::vector<Array> channels;
 
  Texture() = default;
 
  Texture(glm::ivec2 shape, int num_channels);
 
  Texture(glm::ivec2 shape, int num_channels, float fill_value);
 
  explicit Texture(const Array &array);
 
  Texture(const Array &r, const Array &g, const Array &b);
 
  Texture(const Array &r, const Array &g, const Array &b, const Array &a);
 
  explicit Texture(const std::vector<Array> &channels);
 
  explicit Texture(const std::string &fname, bool flip_j = false);
 
  int num_channels() const
  {
    return static_cast<int>(channels.size());
  }
 
  Array &operator[](size_t idx)
  {
    return channels[idx];
  }
  const Array &operator[](size_t idx) const
  {
    return channels[idx];
  }
 
  Array &channel(size_t idx)
  {
    return channels[idx];
  }
  const Array &channel(size_t idx) const
  {
    return channels[idx];
  }
 
  float &operator()(int i, int j, int c)
  {
    return channels[c](i, j);
  }
 
  const float &operator()(int i, int j, int c) const
  {
    return channels[c](i, j);
  }
 
  glm::vec3 get_pixel3(int i, int j) const;
 
  glm::vec4 get_pixel4(int i, int j) const;
 
  void set_pixel(int i, int j, const glm::vec3 &color);
 
  void set_pixel(int i, int j, const glm::vec4 &color);
 
  float max() const;
 
  float min() const;
 
  void remap(float vmin = 0.f, float vmax = 1.f);
 
  Texture resample_to_shape(glm::ivec2 new_shape_xy) const;
 
  cv::Mat to_cv_mat() const;
 
  std::vector<uint8_t> to_img_8bit(bool flip_y = false) const;
 
  void to_png(const std::string &fname, int depth = CV_8U) const;
};
 
} // namespace hmap