PathTracer.hpp

#pragma once
#include "raycaster/Raycaster.hpp"
#include "scene/Scene.hpp"
#include "Common.hpp"
 
class PathTracer {
public:
    PathTracer() = default;
 
    explicit PathTracer(const std::shared_ptr<Scene> & scene);
 
    void render(const Camera & camera, size_t samples, size_t depth, Image & render);
 
    const Raycaster & raycaster() const { return _raycaster; }
 
private:
 
    static glm::ivec2 getSampleGrid(size_t samples);
 
    static glm::vec2 getSamplePosition(size_t sid, const glm::ivec2 & cellCount, const glm::vec2 & cellSize);
 
    static glm::mat3 buildLocalFrame(const Object & obj, const Raycaster::Hit & hit, const glm::vec3 & rayDir, const glm::vec2 & uv);
 
    bool checkVisibility(const glm::vec3 & startPos, const glm::vec3 & rayDir, float maxDist) const;
 
    glm::vec3 evalBackground(const glm::vec3 & rayDir, const glm::vec3 & rayPos, const glm::vec2 & ndcPos, bool directHit) const;
 
    Raycaster _raycaster;          
    std::shared_ptr<Scene> _scene; 
};