VolumeFluidDiffuse.h

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#pragma once
#include "common/Export.h"
 
 
#include <glm/vec3.hpp>
#include <glm/vec4.hpp>
#include <span>
#include <string>
#include <vector>
#include "common/Result.h"
#include "fluids/VolumeFluid.h"
 
namespace eve::fluids {
 
struct VolumeFluidDiffuseParticle {
    glm::vec3 position{0.f};
    glm::vec3 velocity{0.f};
    float life = 2.f;
};
 
struct VolumeFluidDiffuseSnapshot {
    std::string                             schema   = "eve.volume-fluid-diffuse";
    unsigned                                version  = 1;
    unsigned                                capacity = 2048;
    std::vector<VolumeFluidDiffuseParticle> particles;
};
 
class EVENGINE_API_DOMAINS VolumeFluidDiffuse final {
public:
    VolumeFluidDiffuse() = default;
    [[nodiscard]] Result<void> emit(std::span<const VolumeFluidDiffuseParticle> particles);
    [[nodiscard]] Result<void> advance(const VolumeFluid& fluid, float seconds, unsigned minimumNeighbors = 4);
    [[nodiscard]] VolumeFluidDiffuseSnapshot snapshot() const;
    [[nodiscard]] Result<void> restore(const VolumeFluidDiffuseSnapshot& snapshot);
    [[nodiscard]] unsigned particleCount() const;
    [[nodiscard]] unsigned availableCapacity() const;
    void copyRenderData(std::vector<glm::vec4>& positionLife) const;
    void clear();
 
private:
    unsigned                                capacity_ = 2048;
    std::vector<VolumeFluidDiffuseParticle> particles_;
    std::vector<VolumeFluidDiffuseParticle> candidateScratch_;
    std::vector<glm::vec3>                  positionScratch_;
    std::vector<VolumeFluidFieldSample>     sampleScratch_;
};
}  // namespace eve::fluids