PathTracing/LightSampler.hpp at main · marko176/PathTracing · GitHub

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#pragma once
#include "Light.hpp"
#include "Primitive.hpp"
#include "BVH.hpp"
class LightSampler{
public:
    virtual ~LightSampler() = default;
    virtual void Add(const std::shared_ptr<Light>& light) = 0;
    void Add(const std::vector<std::shared_ptr<Light>>& lights){
        for(const std::shared_ptr<Light>& l : lights){
            Add(l);
        }
    }
    virtual std::shared_ptr<Light> Sample(float u) const = 0;
    virtual float PMF(const std::shared_ptr<Light>& light) const = 0;
    virtual void PreProcess(const AABB& bbox) = 0;
};

class UniformLightSampler : public LightSampler{
public:
    virtual ~UniformLightSampler() = default;

    void Add(const std::shared_ptr<Light>& light) override;

    void Add(const std::vector<std::shared_ptr<Light>>& lights) {
        LightSampler::Add(lights);
    }

    std::shared_ptr<Light> Sample(float u) const override;

    float PMF(const std::shared_ptr<Light>& light) const override;

    void PreProcess(const AABB& bbox) override;
private:
    std::vector<std::shared_ptr<Light>> lights;
};

class PowerLightSampler : public LightSampler{
public:
    virtual ~PowerLightSampler() = default;

    void Add(const std::shared_ptr<Light>& light) override;

    void Add(const std::vector<std::shared_ptr<Light>>& lights) {
        LightSampler::Add(lights);
    }

    std::shared_ptr<Light> Sample(float u) const override;

    float PMF(const std::shared_ptr<Light>& light) const override;

    void PreProcess(const AABB& bbox) override;
private:
    std::vector<std::shared_ptr<Light>> lights;
    std::vector<float> lightPowers;
    float totalPower;
};