carving.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 "highmap/boundary.hpp"
#include "highmap/geometry/path.hpp"
 
namespace hmap
{
 
// clang-format off
enum ElevationLongitudinalProfile : int
{
    ELP_UNCHANGED,
    ELP_FLAT, 
    ELP_DECREASING, 
    ELP_INCREASING, 
};
// clang-format on
 
void dig_path(Array    &z,
              Path     &path,
              int       width = 1,
              int       decay = 2,
              int       flattening_radius = 16,
              bool      force_downhill = false,
              glm::vec4 bbox = {0.f, 1.f, 0.f, 1.f},
              float     depth = 0.f);
 
void dig_river(Array                   &z,
               const std::vector<Path> &path_list,
               float                    riverbank_talus,
               int                      river_width = 0,
               int                      merging_width = 0,
               float                    depth = 0.f,
               float                    riverbed_talus = 0.f,
               float                    noise_ratio = 0.9f,
               uint                     seed = 0,
               Array                   *p_mask = nullptr);
 
void dig_river(Array      &z,
               const Path &path,
               float       riverbank_talus,
               int         river_width = 0,
               int         merging_width = 0,
               float       depth = 0.f,
               float       riverbed_talus = 0.f,
               float       noise_ratio = 0.9f,
               uint        seed = 0,
               Array      *p_mask = nullptr);
 
void flatbed_carve(Array        &z,
                   const Path   &path,
                   float         bottom_extent = 32.f, // pixels
                   float         vmin = 0.1f,
                   float         depth = 0.05f,
                   float         falloff_distance = 128.f,
                   float         outer_slope = 0.1f,
                   bool          preserve_bedshape = true,
                   RadialProfile radial_profile = RadialProfile::RP_GAIN,
                   float         radial_profile_parameter = 2.f,
                   Array        *p_falloff_mask = nullptr,
                   const Array  *p_noise_r = nullptr,
                   glm::vec4     bbox = {0.f, 1.f, 0.f, 1.f});
 
void trench(Array        &z,
            const Path   &path,
            float         width,
            bool          enable_width_depth_scaling = true,
            bool          enable_width_distance_scaling = true,
            bool          enable_width_curvature_scaling = false,
            float         curvature_radius_min = 1.f,
            float         curv_width_ratio_min = 0.5f,
            float         curv_width_ratio_max = 2.f,
            RadialProfile radial_profile = RadialProfile::RP_SMOOTHSTEP_UPPER,
            float         radial_profile_parameter = 2.f,
            ElevationLongitudinalProfile longitudinal_profile =
                ElevationLongitudinalProfile::ELP_DECREASING,
            float        elevation_shift = -0.05f,
            float        shift_ramp_start_ratio = 0.f,
            float        shift_ramp_end_ratio = 0.f,
            float        min_slope = 0.001f,
            size_t       k_neighbors = 8,
            const Array *p_noise_r = nullptr,
            Array       *p_bending_mask = nullptr,
            glm::vec4    bbox = {0.f, 1.f, 0.f, 1.f});
 
} // namespace hmap