surface_optics_fwd.h

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#pragma once
 
#include "Math/math.h"
#include "Utility/TBitFlags.h"
 
#include <Common/primitive_type.h>
 
#include <type_traits>
 
namespace ph
{
 
enum class ESurfacePhenomenon : uint32
{
    DiffuseReflection       = math::flag_bit<uint32, 0>(),
    NearDiffuseReflection   = math::flag_bit<uint32, 1>(),
    DeltaReflection         = math::flag_bit<uint32, 2>(),
    GlossyReflection        = math::flag_bit<uint32, 3>(),
    DiffuseTransmission     = math::flag_bit<uint32, 4>(),
    NearDiffuseTransmission = math::flag_bit<uint32, 5>(),
    DeltaTransmission       = math::flag_bit<uint32, 6>(),
    GlossyTransmission      = math::flag_bit<uint32, 7>()
};
 
PH_DEFINE_INLINE_ENUM_FLAG_OPERATORS(ESurfacePhenomenon);
 
using SurfacePhenomena = TEnumFlags<ESurfacePhenomenon>;
using SurfaceElemental = int;
 
static_assert(std::is_signed_v<SurfaceElemental>, 
    "Type of `SurfaceElemental` must be signed, as special meanings are "
    "defined with negative values.");
 
inline constexpr ESurfacePhenomenon ALL_SURFACE_PHENOMENA = 
    static_cast<ESurfacePhenomenon>(~uint32(0));
 
inline constexpr ESurfacePhenomenon DIFFUSE_SURFACE_PHENOMENA = 
    ESurfacePhenomenon::DiffuseReflection | ESurfacePhenomenon::DiffuseTransmission;
 
inline constexpr ESurfacePhenomenon DELTA_SURFACE_PHENOMENA = 
    ESurfacePhenomenon::DeltaReflection | ESurfacePhenomenon::DeltaTransmission;
 
inline constexpr ESurfacePhenomenon GLOSSY_SURFACE_PHENOMENA = 
    ESurfacePhenomenon::GlossyReflection | ESurfacePhenomenon::GlossyTransmission;
 
inline constexpr SurfaceElemental ALL_SURFACE_ELEMENTALS = -1;
 
class SurfaceOptics;
 
}// end namespace ph