GEO_reverse_uv_sampler.hh

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/* SPDX-FileCopyrightText: 2023 Blender Authors
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */
 
#pragma once
 
#include <optional>
 
#include "BLI_math_vector_types.hh"
#include "BLI_multi_value_map.hh"
#include "BLI_span.hh"
 
namespace blender::geometry {
 
class ReverseUVSampler {
 public:
  struct LookupGrid;
 
 private:
  Span<float2> uv_map_;
  Span<int3> corner_tris_;
  int resolution_;
  std::unique_ptr<LookupGrid> lookup_grid_;
 
 public:
  ReverseUVSampler(Span<float2> uv_map, Span<int3> corner_tris);
  ~ReverseUVSampler();
 
  enum class ResultType {
    None,
    Ok,
    Multiple,
  };
 
  struct Result {
    ResultType type = ResultType::None;
    int tri_index = -1;
    float3 bary_weights;
  };
 
  Result sample(const float2 &query_uv) const;
  void sample_many(Span<float2> query_uvs, MutableSpan<Result> r_results) const;
};
 
}  // namespace blender::geometry