Guides.h

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#pragma once
 
#include "common/Result.h"
#include "graphics/hair/StrandsDatas.h"
 
#include <cstddef>
#include <cstdint>
#include <vector>
 
namespace eve::graphics::hair {
 
enum class InterpolationMode : uint8_t { Rigid = 0, Offset = 1, Smooth = 2 };
 
struct GuideInfluence {
    uint32_t guideIndex = 0;
    float weight = 0.f;
};
 
struct StrandGuideWeights {
    static constexpr int kMaxInfluences = 4;
    GuideInfluence influencers[kMaxInfluences]{};
    int count = 0;
};
 
[[nodiscard]] EVENGINE_API_BACKENDS Result<StrandsDatas> extractGuides(const StrandsDatas &strands,
                                                                       float               guideFraction);
 
[[nodiscard]] Result<std::vector<StrandGuideWeights>> EVENGINE_API_BACKENDS
buildGuideWeights(const StrandsDatas &strands, const StrandsDatas &guides, int maxInfluences = 3,
                  InterpolationMode mode = InterpolationMode::Offset);
 
[[nodiscard]] Result<StrandsDatas> EVENGINE_API_BACKENDS
interpolateStrands(const StrandsDatas &strandsRest, const StrandsDatas &guidesRest, const StrandsDatas &guidesDeformed,
                   const std::vector<StrandGuideWeights> &weights, InterpolationMode mode);
 
}  // namespace eve::graphics::hair