Hans Goudey
21adf2ec89
This separates the UV reverse sampling and the barycentric mixing of the mesh attribute into separate multi-functions. This separates concerns and allows for future de-duplication of the UV sampling function if that is implemented as an optimization pass. That would be helpful since it's the much more expensive operation. This was simplified by returning the triangle index in the reverse UV sampler rather than a pointer to the triangle, which required passing a span of triangles separately in a few places.
47 lines
998 B
C++
47 lines
998 B
C++
/* SPDX-License-Identifier: GPL-2.0-or-later */
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#pragma once
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#include <optional>
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#include "BLI_math_vector.hh"
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#include "BLI_multi_value_map.hh"
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#include "BLI_span.hh"
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#include "DNA_meshdata_types.h"
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namespace blender::geometry {
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/**
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* Can find the polygon/triangle that maps to a specific uv coordinate.
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*
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* \note this uses a trivial implementation currently that has to be replaced.
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*/
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class ReverseUVSampler {
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private:
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const Span<float2> uv_map_;
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const Span<MLoopTri> looptris_;
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int resolution_;
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MultiValueMap<int2, int> looptris_by_cell_;
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public:
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ReverseUVSampler(const Span<float2> uv_map, const Span<MLoopTri> looptris);
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enum class ResultType {
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None,
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Ok,
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Multiple,
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};
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struct Result {
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ResultType type = ResultType::None;
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int looptri_index = -1;
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float3 bary_weights;
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};
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Result sample(const float2 &query_uv) const;
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void sample_many(Span<float2> query_uvs, MutableSpan<Result> r_results) const;
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};
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} // namespace blender::geometry
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