TSdlSpectrum.h

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#pragma once
 
#include "SDL/Introspect/TSdlValue.h"
#include "SDL/Introspect/TSdlOptionalValue.h"
#include "Math/Color/Spectrum.h"
#include "SDL/sdl_helpers.h"
#include "SDL/SdlResourceLocator.h"
#include "SDL/Introspect/SdlInputContext.h"
#include "DataIO/io_utils.h"
#include "Actor/SDLExtension/sdl_spectrum_io.h"
#include "Actor/SDLExtension/sdl_color_enums.h"
 
#include <Common/assertion.h>
#include <Common/primitive_type.h>
#include <Common/io_exceptions.h>
 
#include <type_traits>
#include <string>
#include <vector>
#include <utility>
 
namespace ph
{
 
template<typename Owner, typename SdlValueType = TSdlValue<math::Spectrum, Owner>>
class TSdlSpectrum : public SdlValueType
{
    static_assert(std::is_base_of_v<TSdlAbstractValue<math::Spectrum, Owner>, SdlValueType>,
        "SdlValueType should be a subclass of TSdlAbstractValue.");
 
public:
    template<typename ValueType>
    TSdlSpectrum(
        std::string valueName, 
        const math::EColorUsage usage,
        ValueType Owner::* const valuePtr)
 
        : SdlValueType("spectrum", std::move(valueName), valuePtr)
 
        , m_usage(usage)
    {}
 
    std::string valueAsString(const math::Spectrum& spectrum) const override
    {
        // TODO: add type, # values?
        return spectrum.toString();
    }
 
    SdlNativeData ownedNativeData(Owner& owner) const override
    {
        math::Spectrum* const spectrum = this->getValue(owner);
        if constexpr(std::is_base_of_v<TSdlOptionalValue<math::Spectrum, Owner>, SdlValueType>)
        {
            auto data = SdlNativeData(
                [&optSpectrum = this->valueRef(owner)](std::size_t /* elementIdx */) -> SdlGetterVariant
                {
                    return optSpectrum
                        ? SdlNativeData::permissiveElementGetter(&(*optSpectrum))
                        : std::monostate{};
                },
                [&optSpectrum = this->valueRef(owner)](std::size_t /* elementIdx */, SdlSetterVariant input) -> bool
                {
                    if(input.isEmpty())
                    {
                        optSpectrum = std::nullopt;
                        return true;
                    }
                    else
                    {
                        *optSpectrum = math::Spectrum{};
                        return SdlNativeData::permissiveElementSetter(input, &(*optSpectrum));
                    }
                },
                AnyNonConstPtr(spectrum));
 
            data.numElements = spectrum ? 1 : 0;
            data.elementContainer = ESdlDataFormat::Single;
            data.elementType = ESdlDataType::Spectrum;
            data.isNullClearable = true;
            return data;
        }
        else
        {
            return SdlNativeData::fromSingleElement(
                spectrum, ESdlDataFormat::Single, ESdlDataType::Spectrum, true, true);
        }
    }
 
protected:
    void loadFromSdl(
        Owner&                 owner,
        const SdlInputClause&  clause,
        const SdlInputContext& ctx) const override
    {
        this->setValue(owner, sdl::load_spectrum(clause.value, clause.tag, m_usage));
    }
 
    void saveToSdl(
        const Owner&            owner,
        SdlOutputClause&        out_clause,
        const SdlOutputContext& ctx) const override
    {
        if(const math::Spectrum* value = this->getConstValue(owner); value)
        {
            sdl::save_spectrum(*value, out_clause.value, out_clause.tag);
        }
        else
        {
            out_clause.isEmpty = true;
        }
    }
 
private:
    math::EColorUsage m_usage;
};
 
template<typename Owner>
using TSdlOptionalSpectrum = TSdlSpectrum<Owner, TSdlOptionalValue<math::Spectrum, Owner>>;
 
}// end namespace ph