FogRayMarch.h

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#pragma once
#include "common/Export.h"
 
#include "common/Result.h"
#include "graphics/fog/BeerLightCache.h"
#include "graphics/fog/FogDensityField.h"
#include "graphics/fog/FogProfile.h"
#include "graphics/fog/FogTypes.h"
 
#include <optional>
 
#include <glm/vec3.hpp>
 
namespace eve::graphics::fog {
 
struct FogVolumeBound {
    enum class Kind : uint8_t { SkyShell, HeightLayer, Obb };
 
    Kind kind = Kind::HeightLayer;
    float skyRadius = 200.f;
    float heightMin = 0.f;
    float heightMax = 8.f;
    glm::vec3 obbCenter{0.f};
    glm::vec3 obbHalfExtents{4.f};
    glm::vec3 obbAxisX{1.f, 0.f, 0.f};
    glm::vec3 obbAxisY{0.f, 1.f, 0.f};
    glm::vec3 obbAxisZ{0.f, 0.f, 1.f};
};
 
class EVENGINE_API_WORLD FogRayMarch {
public:
    [[nodiscard]] static std::optional<FogRayInterval> intersectBound(const glm::vec3& origin,
                                                                     const glm::vec3& direction,
                                                                     const FogVolumeBound& bound);
 
    [[nodiscard]] Result<FogRayResult> integrate(const FogDensityField& field, const FogProfile& profile,
                                                 const glm::vec3& origin, const glm::vec3& direction,
                                                 const FogVolumeBound& bound, const glm::vec3& lightDir,
                                                 const glm::vec3& lightColor, float lightIntensity,
                                                 const glm::vec3& skyAmbient, const glm::vec3& groundAmbient,
                                                 int sampleCount, float sceneDepth,
                                                 const BeerLightCache* beerCache,
                                                 bool useAnalyticSegments) const;
};
 
}  // namespace eve::graphics::fog