Binding.h

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#pragma once
 
#include "common/Result.h"
#include "graphics/hair/StrandsDatas.h"
 
#include <cstddef>
#include <cstdint>
#include <vector>
 
#include <glm/vec3.hpp>
 
namespace eve::graphics::hair {
 
struct SkinTriMesh {
    const float *posXYZ = nullptr;
    int vertexCount = 0;
    const uint32_t *indices = nullptr;
    int indexCount = 0;
};
 
enum class BindingDeformMode : uint8_t { Rigid = 0, Offset = 1 };
 
struct RootAttach {
    uint32_t triangleIndex = 0;
    glm::vec3 barycentric{1.f, 0.f, 0.f};
    glm::vec3 restRoot{0.f};
    glm::vec3 restNormal{0.f, 1.f, 0.f};
};
 
class EVENGINE_API_BACKENDS GroomBinding {
public:
    [[nodiscard]] Result<void> build(const StrandsDatas &strands, const SkinTriMesh &restMesh);
 
    void clear();
 
    [[nodiscard]] size_t rootCount() const { return roots_.size(); }
    [[nodiscard]] const RootAttach *rootAt(size_t index) const;
 
    [[nodiscard]] Result<StrandsDatas> deform(const StrandsDatas &restStrands,
                                             const SkinTriMesh &deformedMesh,
                                             BindingDeformMode mode = BindingDeformMode::Rigid) const;
 
private:
    std::vector<RootAttach> roots_;
};
 
}  // namespace eve::graphics::hair