Added presentations from EVI 2017

EVI - 2017/EVI 21/EVIray/directional_light.cpp

@@ -0,0 +1,29 @@
+#include <limits>
+
+#include <glm/glm.hpp>
+#include <glm/gtc/constants.hpp>
+
+#include "directional_light.hpp"
+
+using std::numeric_limits;
+using glm::pi;
+using glm::reflect;
+using glm::dot;
+using glm::pow;
+using glm::max;
+
+vec3 DirectionalLight::direction(vec3 point) const {
+  return m_position;
+}
+
+float DirectionalLight::distance(vec3 point) const {
+  return numeric_limits<float>::max();
+}
+
+vec3 DirectionalLight::diffuse(vec3 normal, Ray & r, vec3 i_pos, Material & m) const {
+  return m.m_brdf->diffuse(m_position, normal, r, i_pos, m_diffuse);
+}
+
+vec3 DirectionalLight::specular(vec3 normal, Ray & r, vec3 i_pos, Material & m) const {
+  return m.m_brdf->specular(m_position, normal, r, i_pos, m_specular, m.m_shininess);
+}