50 lines
922 B
C++
50 lines
922 B
C++
#include <psemek/vecr/intersect.hpp>
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#include <psemek/geom/math.hpp>
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#include <vector>
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namespace psemek::vecr
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{
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sdf_sample sdf(intersect const & s, geom::point<float, 2> const & p)
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{
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sdf_sample result;
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if (s.smooth == 0.f)
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{
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result.value = -std::numeric_limits<float>::infinity();
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for (auto const & ss : s.shapes)
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{
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auto r = sdf(ss, p);
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if (geom::make_max(result.value, r.value))
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result.gradient = r.gradient;
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}
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}
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else
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{
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float v = 0.f;
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for (auto const & ss : s.shapes)
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{
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auto r = sdf(ss, p);
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float vs = std::exp(r.value / s.smooth);
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v += vs;
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result.gradient += r.gradient * vs;
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}
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result.value = std::log(v) * s.smooth;
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result.gradient /= v;
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}
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return result;
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}
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geom::box<float, 2> bbox(intersect const & s)
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{
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auto result = geom::box<float, 2>::full();
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for (auto const & ss : s.shapes)
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result &= bbox(ss);
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return result;
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}
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}
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