RibbonBuilder.h

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#pragma once
 
#include "common/Result.h"
#include "graphics/hair/StrandsDatas.h"
 
#include <cstdint>
#include <vector>
 
#include <glm/vec3.hpp>
 
namespace eve::graphics::hair {
 
struct RibbonMesh {
    std::vector<float> posXYZ;
    std::vector<float> nrmXYZ;
    std::vector<float> uvST;
    std::vector<uint32_t> indices;
 
    [[nodiscard]] int vertexCount() const { return int(posXYZ.size() / 3u); }
    [[nodiscard]] int indexCount() const { return int(indices.size()); }
};
 
struct RibbonParams {
    glm::vec3 sideHint{1.f, 0.f, 0.f};
    float widthScale = 1.f;
    float minWidth = 1e-5f;
};
 
[[nodiscard]] EVENGINE_API_BACKENDS Result<RibbonMesh> buildRibbons(const StrandsDatas &strands,
                                                                    const RibbonParams &params = {});
 
EVENGINE_API_BACKENDS void appendRibbonMesh(RibbonMesh &dst, const RibbonMesh &src);
 
}  // namespace eve::graphics::hair