kernels.hpp

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/* Copyright (c) 2023 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 <functional>
 
#include "highmap/array.hpp"
 
namespace hmap
{
enum KernelType : int
{
  BIWEIGHT,      
  CUBIC_PULSE,   
  CONE,          
  CONE_SMOOTH,   
  DISK,          
  LORENTZIAN,    
  SMOOTH_COSINE, 
  SQUARE,        
  TRICUBE,       
  CUPOLA         
};
 
Array get_kernel(glm::ivec2 shape, KernelType kernel_type);
 
// --- KERNELS
 
Array biweight(glm::ivec2 shape);
 
Array blackman(glm::ivec2 shape);
 
Array cone(glm::ivec2 shape);
 
Array cone_talus(float height, float talus);
 
Array cone_smooth(glm::ivec2 shape);
 
Array cubic_pulse(glm::ivec2 shape);
 
std::vector<float> cubic_pulse_1d(int nk);
 
Array cubic_pulse_directional(glm::ivec2 shape,
                              float      angle,
                              float      aspect_ratio,
                              float      anisotropy);
 
Array cubic_pulse_truncated(glm::ivec2 shape, float slant_ratio, float angle);
 
Array cupola(glm::ivec2 shape, float rc = 0.5f);
 
Array disk(glm::ivec2 shape);
 
Array disk_smooth(glm::ivec2 shape, float r_cutoff = 0.9f);
 
Array gabor(glm::ivec2 shape,
            float      kw,
            float      angle,
            bool       quad_phase_shift = false);
 
Array gabor_dune(glm::ivec2 shape,
                 float      kw,
                 float      angle,
                 float      xtop,
                 float      xbottom);
 
Array hann(glm::ivec2 shape);
 
Array lorentzian(glm::ivec2 shape, float footprint_threshold = 0.1f);
 
Array lorentzian_compact(glm::ivec2 shape);
 
Array sinc_radial(glm::ivec2 shape, float kw);
 
Array sinc_separable(glm::ivec2 shape, float kw);
 
Array smooth_cosine(glm::ivec2 shape);
 
Array square(glm::ivec2 shape);
 
Array tricube(glm::ivec2 shape);
 
} // namespace hmap