AAreaLight.h

Go to the documentation of this file.

#pragma once
 
#include "Actor/Light/AGeometricLight.h"
#include "Math/Color/Spectrum.h"
#include "SDL/sdl_interface.h"
#include "Actor/SDLExtension/TSdlSpectrum.h"
 
#include <Common/primitive_type.h>
 
namespace ph
{
 
class AAreaLight : public AGeometricLight
{
public:
    virtual std::shared_ptr<Geometry> getArea(const CookingContext& ctx) const = 0;
 
    std::shared_ptr<Geometry> getGeometry(const CookingContext& ctx) const override;
    std::shared_ptr<Material> getMaterial(const CookingContext& ctx) const override;
 
    const Emitter* buildEmitter(
        const CookingContext& ctx,
        TSpanView<const Primitive*> lightPrimitives) const override;
 
private:
    math::Spectrum m_color;
    real m_numWatts;
 
public:
    PH_DEFINE_SDL_CLASS(TSdlOwnerClass<AAreaLight>)
    {
        ClassType clazz("area-light");
        clazz.docName("Area Light Actor");
        clazz.description(
            "This type of light source has a finite area, with various simplifications on the "
            "characteristics of the emission profile. Energy is allowed to emit diffusively and "
            "uniformally within the area. By default, the energy emitting surface absorbs all "
            "incoming energy (which is effectively a pure absorber).");
        clazz.baseOn<AGeometricLight>();
 
        TSdlSpectrum<OwnerType> color("color", math::EColorUsage::EMR, &OwnerType::m_color);
        color.description("The color of this light source.");
        color.defaultTo(math::Spectrum().setLinearSRGB({1, 1, 1}, math::EColorUsage::EMR));
        clazz.addField(color);
 
        TSdlReal<OwnerType> numWatts("watts", &OwnerType::m_numWatts);
        numWatts.description("Energy emitted by this light source, in watts.");
        numWatts.defaultTo(100);
        clazz.addField(numWatts);
 
        return clazz;
    }
};
 
}// end namespace ph