calculateLightEmission split into lightEmission, lightPdf

RayTracer/shape/Light.h

@@ -5,7 +5,10 @@ namespace shapes {
 class Light {
    public:
 	virtual util::SurfacePoint sampleLight(const cam::Hit& h) const = 0;
-	virtual util::Vec3 calculateLightEmission(const util::SurfacePoint& p,
-	                                          const util::Vec3& d) const = 0;
+	virtual util::Vec3 lightEmission(const util::SurfacePoint& p) const = 0;
+	virtual float lightPdf(const util::SurfacePoint& p,
+	                       const util::Vec3& dl_out) const = 0;
+
+	virtual std::optional<cam::Hit> intersect(const cam::Ray& r) const = 0;
 };
 }  // namespace shapes
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