MeshVfxScalability.h

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#pragma once
#include "common/Export.h"
 
 
#include <cstddef>
#include <cstdint>
#include <span>
#include <vector>
 
namespace eve::stylize {
 
enum class MeshVfxLodTier : std::uint8_t {
    Full,
    Reduced,
    Minimal,
    Culled,
};
 
struct MeshVfxScalabilityPolicy {
    float fullQualityMinPixels = 96.0f;
    float reducedQualityMinPixels = 32.0f;
    float maximumDistance = 80.0f;
    std::uint32_t workUnitBudget = 128;
    std::uint32_t fullWorkUnits = 4;
    std::uint32_t reducedWorkUnits = 2;
    std::uint32_t minimalWorkUnits = 1;
    std::uint32_t reducedTrailSampleStride = 2;
    std::uint32_t minimalTrailSampleStride = 4;
    std::uint32_t reducedMeshUpdateInterval = 2;
    std::uint32_t minimalMeshUpdateInterval = 4;
};
 
struct MeshVfxLodCandidate {
    std::uint64_t stableInstanceId = 0;
    float distance = 0.0f;
    float projectedRadiusPixels = 0.0f;
    std::int32_t priority = 0;
    bool visible = true;
};
 
struct MeshVfxLodDecision {
    std::uint64_t stableInstanceId = 0;
    MeshVfxLodTier tier = MeshVfxLodTier::Culled;
    std::uint32_t trailSampleStride = 1;
    std::uint32_t meshUpdateInterval = 1;
    std::uint32_t workUnits = 0;
 
};
 
class EVENGINE_API_WORLD MeshVfxScalabilityPlanner {
public:
    explicit MeshVfxScalabilityPlanner(MeshVfxScalabilityPolicy policy = {});
 
    [[nodiscard]] std::vector<MeshVfxLodDecision> plan(std::span<const MeshVfxLodCandidate> candidates) const;
 
    [[nodiscard]] const MeshVfxScalabilityPolicy& policy() const noexcept { return policy_; }
 
private:
    MeshVfxScalabilityPolicy policy_;
};
 
} // namespace eve::stylize