ClusterGrid.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 HairCluster {
    glm::vec3 aabbMin{0.f};
    glm::vec3 aabbMax{0.f};
    std::vector<uint32_t> curveIndices;
};
 
class EVENGINE_API_BACKENDS ClusterGrid {
public:
    [[nodiscard]] Result<void> build(const StrandsDatas &strands, float cellSize);
 
    void clear();
 
    [[nodiscard]] size_t clusterCount() const { return clusters_.size(); }
    [[nodiscard]] const HairCluster *clusterAt(size_t index) const;
 
    [[nodiscard]] Result<std::vector<uint32_t>> cullClusters(const float *viewProj16) const;
 
    [[nodiscard]] Result<std::vector<uint32_t>>
    collectCurveIndices(const std::vector<uint32_t> &clusterIndices) const;
 
    void computeBounds(glm::vec3 &outMin, glm::vec3 &outMax) const;
 
private:
    std::vector<HairCluster> clusters_;
};
 
[[nodiscard]] EVENGINE_API_BACKENDS Result<StrandsDatas> filterStrandsByCurves(
    const StrandsDatas &src, const std::vector<uint32_t> &curveIndices);
 
}  // namespace eve::graphics::hair