GroomAsset.h

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#pragma once
 
#include "common/Result.h"
#include "graphics/hair/StrandsDatas.h"
 
#include <cstddef>
#include <cstdint>
#include <string>
#include <vector>
 
namespace eve::graphics::hair {
 
enum class Representation : uint8_t { Strands = 0, Cards = 1, Meshes = 2, None = 3 };
 
struct GroomLod {
    float screenSize = 1.f;
    Representation representation = Representation::Strands;
    float curveFraction = 1.f;
    float thicknessScale = 1.f;
};
 
struct GroomGroup {
    std::string name;
    uint32_t groupId = 0;
    StrandsDatas strands;
    StrandsDatas guides;
    std::vector<GroomLod> lods;
};
 
class EVENGINE_API_BACKENDS GroomAsset {
public:
    [[nodiscard]] Result<void> addGroup(GroomGroup group);
 
    [[nodiscard]] size_t groupCount() const { return groups_.size(); }
    [[nodiscard]] const GroomGroup *groupAt(size_t index) const;
    [[nodiscard]] const GroomGroup *findGroupById(uint32_t groupId) const;
 
    void clear();
 
    [[nodiscard]] Result<void> validate() const;
 
private:
    std::vector<GroomGroup> groups_;
};
 
[[nodiscard]] EVENGINE_API_BACKENDS size_t selectLodIndex(const std::vector<GroomLod> &lods, float screenSize);
 
}  // namespace eve::graphics::hair