AnalyticalVolLight.h

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#pragma once
#include "common/Export.h"
 
#include "common/Result.h"
#include "graphics/fog/FogProfile.h"
#include "graphics/fog/FogTypes.h"
 
#include <cstdint>
#include <optional>
 
#include <glm/vec3.hpp>
 
namespace eve::graphics::fog {
 
struct AnalyticBeam {
    enum class Shape : uint8_t { ConeFrustum = 0, PyramidFrustum = 1 };
 
    Shape shape = Shape::ConeFrustum;
    glm::vec3 apex{0.f};
    glm::vec3 direction{0.f, 0.f, -1.f};
    float nearDistance = 0.25f;
    float farDistance = 12.f;
    float nearRadius = 0.1f;
    float farRadius = 2.5f;
    glm::vec3 color{1.f, 0.95f, 0.85f};
    float intensity = 2.f;
};
 
class EVENGINE_API_WORLD AnalyticalVolLight {
public:
    [[nodiscard]] static std::optional<FogRayInterval> intersectBeam(const glm::vec3& origin,
                                                                     const glm::vec3& direction,
                                                                     const AnalyticBeam& beam);
 
    [[nodiscard]] Result<FogRayResult> integrate(const AnalyticBeam& beam, const FogProfile& profile,
                                                 const glm::vec3& origin, const glm::vec3& direction,
                                                 float sceneDepth, int segments,
                                                 float mediumDensity) const;
};
 
}  // namespace eve::graphics::fog