sdl_component_enums.h

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#pragma once
 
#include "Core/SurfaceBehavior/Property/enums.h"
#include "SDL/sdl_interface.h"
 
namespace ph
{
 
enum class EInterfaceFresnel
{
    Unspecified = 0,
 
    Schlick,
    Exact
};
 
enum class EInterfaceMicrosurface
{
    Unspecified = 0,
 
    TrowbridgeReitz,// a.k.a. GGX
    Beckmann
};
 
enum class ERoughnessToAlpha
{
    Unspecified = 0,
 
    Equaled,
    Squared,
    PbrtV3
};
 
PH_DEFINE_SDL_ENUM(TSdlGeneralEnum<EInterfaceFresnel>)
{
    SdlEnumType sdlEnum("interface-fresnel");
    sdlEnum.description("Controls the Fresnel model used.");
 
    sdlEnum.addEntry(EnumType::Unspecified, "");
    sdlEnum.addEntry(EnumType::Schlick, "schlick", "An approximative model developed by Schlick.");
    sdlEnum.addEntry(EnumType::Exact, "exact", "The full-form Fresnel formula.");
 
    return sdlEnum;
}
 
PH_DEFINE_SDL_ENUM(TSdlGeneralEnum<EInterfaceMicrosurface>)
{
    SdlEnumType sdlEnum("interface-microsurface");
    sdlEnum.description("Controls the model for describing the micro structure of the interface.");
 
    sdlEnum.addEntry(EnumType::Unspecified, "");
    sdlEnum.addEntry(EnumType::TrowbridgeReitz, "ggx", "Formally known as the Trowbridge-Reitz distribution.");
    sdlEnum.addEntry(EnumType::Beckmann, "beckmann", "The Beckmann distribution.");
 
    return sdlEnum;
}
 
PH_DEFINE_SDL_ENUM(TSdlGeneralEnum<ERoughnessToAlpha>)
{
    SdlEnumType sdlEnum("roughness-to-alpha");
    sdlEnum.description(
        "How roughness value will be mapped to alpha, a value that controls "
        "surface normal distribution function.");
 
    sdlEnum.addEntry(EnumType::Unspecified, "");
 
    sdlEnum.addEntry(EnumType::Equaled, "equaled",
        "Directly assign roughness value as-is to alpha.");
 
    sdlEnum.addEntry(EnumType::Squared, "squared",
        "Mapping for a perceptually linear roughness. According to a course note in SIGGRAPH 2014: "
        "Moving Frostbite to Physically Based Rendering 3.0, P.68, they concluded that a squared "
        "mapping gives slightly better distribution of the profiles (blur amount) among all mip "
        "levels in the case of pre-integrated diffuse IBL maps.");
 
    sdlEnum.addEntry(EnumType::PbrtV3, "pbrt-v3",
        "The mapping used in PBRT-v3.");
 
    return sdlEnum;
}
 
PH_DEFINE_SDL_ENUM(TSdlGeneralEnum<EMaskingShadowing>)
{
    SdlEnumType sdlEnum("masking-shadowing");
    sdlEnum.description(
        "The type of masking and shadowing term for a microfacet distribution.");
 
    sdlEnum.addEntry(EnumType::HightCorrelated, "");
 
    sdlEnum.addEntry(EnumType::HightCorrelated, "height-correlated",
        "Modeling the correlation between masking and shadowing due to the height of the microsurface.");
 
    sdlEnum.addEntry(EnumType::Separable, "separable",
        "Statistically independent masking and shadowing.");
 
    sdlEnum.addEntry(EnumType::DirectionCorrelated, "dir-correlated",
        "Modeling the correlation between masking and shadowing due to the differences between "
        "incident and outgoing directions.");
 
    sdlEnum.addEntry(EnumType::HeightDirectionCorrelated, "height-dir-correlated",
        "Modeling the correlation between masking and shadowing due to both height and direction "
        "differences.");
 
    return sdlEnum;
}
 
}// end namespace ph