Added presentations from EVI 2017

EVI - 2017/EVI 21/EVIray/spot_light.hpp

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+#pragma once
+#ifndef SPOT_LIGHT_HPP
+#define SPOT_LIGHT_HPP
+
+#include <glm/glm.hpp>
+
+#include "point_light.hpp"
+
+using glm::vec3;
+using glm::normalize;
+
+class SpotLight: public PointLight {
+public:
+  float m_spot_cutoff;
+  float m_spot_exponent;
+  vec3 m_spot_dir;
+
+  SpotLight(): PointLight(), m_spot_cutoff(45.0f), m_spot_exponent(0.0f), m_spot_dir(vec3(0.0f, -1.0f, 0.0f)) { }
+
+  SpotLight(vec3 _p,
+	    vec3 _d,
+	    vec3 _s,
+	    float _c,
+	    float _l,
+	    float _q,
+	    float _sco,
+	    float _se,
+	    vec3 _sd):
+    PointLight(_p, _d, _s, _c, _l, _q),
+    m_spot_cutoff(_sco),
+    m_spot_exponent(_se),
+    m_spot_dir(normalize(_sd))
+  { }
+
+  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;
+};
+
+#endif