StrandsDatas.h

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#pragma once
 
#include "common/Result.h"
 
#include <cstddef>
#include <cstdint>
#include <span>
#include <vector>
 
#include <glm/vec3.hpp>
 
namespace eve::graphics::hair {
 
struct StrandPoint {
    glm::vec3 position{0.f};
    float radius = 0.001f;
    float u = 0.f;
};
 
struct StrandCurve {
    uint32_t pointOffset = 0;
    uint32_t pointCount  = 0;
    float length         = 0.f;
};
 
class EVENGINE_API_BACKENDS StrandsDatas {
public:
    void setPoints(std::vector<StrandPoint> points);
    void setCurves(std::vector<StrandCurve> curves);
 
    [[nodiscard]] uint32_t addPoint(const StrandPoint &point);
    [[nodiscard]] uint32_t addCurve(const StrandCurve &curve);
 
    void clear();
 
    [[nodiscard]] Result<void> validate() const;
 
    [[nodiscard]] size_t pointCount() const { return points_.size(); }
    [[nodiscard]] size_t curveCount() const { return curves_.size(); }
 
    [[nodiscard]] std::span<const StrandPoint> points() const { return points_; }
    [[nodiscard]] std::span<const StrandCurve> curves() const { return curves_; }
 
    [[nodiscard]] std::span<const StrandPoint> curvePoints(size_t curveIndex) const;
 
    void computeBounds(glm::vec3 &outMin, glm::vec3 &outMax) const;
 
private:
    std::vector<StrandPoint> points_;
    std::vector<StrandCurve> curves_;
};
 
}  // namespace eve::graphics::hair