VolumeFluidFoam.h

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#pragma once
 
#include <cstdint>
#include <string>
#include "common/Export.h"
#include "common/Result.h"
#include "fluids/VolumeFluid.h"
#include "fluids/VolumeFluidDiffuse.h"
 
namespace eve::fluids {
 
struct VolumeFluidFoamSettings {
    float    rate               = 500.f;
    float    randomness         = .01f;
    float    vorticityThreshold = 10.f;
    float    densityThreshold   = 2000.f;
    float    lifetime           = 2.f;
    unsigned maxPerStep         = 256;
};
struct VolumeFluidFoamSnapshot {
    std::string             schema  = "eve.volume-fluid-foam";
    unsigned                version = 1;
    VolumeFluidFoamSettings settings;
    std::string credit = "0";
    uint32_t randomState = 1;
};
 
class EVENGINE_API_DOMAINS VolumeFluidFoam final {
public:
    [[nodiscard]] Result<unsigned> advance(const VolumeFluid& source, VolumeFluidDiffuse& pool, float seconds);
    [[nodiscard]] Result<unsigned> advanceFromActor(const VolumeFluid& source, VolumeFluidDiffuse& pool, float seconds,
                                                    unsigned actorGroup);
    [[nodiscard]] Result<unsigned> advanceFromActorInterpolated(const VolumeFluid& source, VolumeFluidDiffuse& pool,
                                                                float seconds, unsigned actorGroup, float alpha);
    [[nodiscard]] VolumeFluidFoamSnapshot snapshot() const;
    [[nodiscard]] Result<void> restore(const VolumeFluidFoamSnapshot& state);
 
private:
    VolumeFluidFoamSettings                 settings_;
    double                                  credit_      = 0;
    uint32_t                                randomState_ = 1;
    std::vector<glm::vec3>                  positionScratch_;
    std::vector<VolumeFluidFieldSample>     sampleScratch_;
    std::vector<VolumeFluidDiffuseParticle> batchScratch_;
    [[nodiscard]] Result<unsigned> advanceFiltered(const VolumeFluid& source, VolumeFluidDiffuse& pool, float seconds,
                                                   bool filterActor, unsigned actorGroup, float alpha);
};
}  // namespace eve::fluids