sphere and disk area lights mostly ready (I think :S).

sphere_area_light.hpp

@@ -0,0 +1,26 @@
+#pragma once
+#ifndef SPHERE_AREA_LIGHT_HPP
+#define SPHERE_AREA_LIGHT_HPP
+
+#include "light.hpp"
+#include "sphere.hpp"
+
+class SphereAreaLight: public AreaLight {
+public:
+  float m_const_att;
+  float m_lin_att;
+  float m_quad_att;
+
+  SphereAreaLight(Sphere * _s, float _c = 1.0, float _l = 0.0, float _q = 0.0):
+    AreaLight(static_cast<Figure *>(_s)),
+    m_const_att(_c),
+    m_lin_att(_l),
+    m_quad_att(_q)
+  { }
+
+  virtual vec3 diffuse(vec3 normal, Ray & r, vec3 i_pos, Material & m) const;
+  virtual vec3 specular(vec3 normal, Ray & r, vec3 i_pos, Material & m) const;
+  virtual void sample_at_surface(vec3 point);
+};
+
+#endif