Specular component added to lighting.

tracer.cpp

@@ -8,6 +8,7 @@
 #include "tracer.hpp"
 
 #define PI 3.14159265358979f
+#define SHININESS 89.0f
 
 using namespace std;
 
@@ -15,6 +16,8 @@ using std::numeric_limits;
 using glm::normalize;
 using glm::radians;
 using glm::dot;
+using glm::reflect;
+using glm::clamp;
 
 static const vec3 BCKG_COLOR = vec3(0.16f, 0.66f, 0.72f);
 
@@ -26,10 +29,10 @@ static inline float random01() {
   return static_cast<float>(rand()) / static_cast<float>(RAND_MAX);
 }
 
-Tracer::Tracer(): m_h(640), m_w(480), m_fov(90.0f), m_a_ratio(640.0f / 480.0f) {}
+Tracer::Tracer(): m_h(480), m_w(640), m_fov(90.0f), m_a_ratio(640.0f / 480.0f) {}
 
 Tracer::Tracer(int h, int w, float fov): m_h(h), m_w(w), m_fov(fov) {
-  m_a_ratio = static_cast<float>(w) / h;
+  m_a_ratio = static_cast<float>(w) / static_cast<float>(h);
 }
 
 vec2 Tracer::sample_pixel(int i, int j) const {
@@ -50,7 +53,7 @@ vec3 Tracer::trace_ray(Ray & r, vector<Figure *> & vf, vector<Light *> & vl, uns
   size_t f_index;
   float t, _t, n_dot_l;
   Figure * _f;
-  vec3 n, color, i_pos;
+  vec3 n, color, i_pos, ref;
   Ray sr;
   bool vis;
 
@@ -82,9 +85,12 @@ vec3 Tracer::trace_ray(Ray & r, vector<Figure *> & vf, vector<Light *> & vl, uns
 
       n_dot_l = max(dot(n, vl[l]->m_position), 0.0);
       color += (vis ? 1.0f : 0.0f) * (_f->color / PI) * vl[l]->m_diffuse * n_dot_l;
+
+      ref = reflect(vl[l]->m_position, n);
+      color += (vis ? 1.0f : 0.0f) * vl[l]->m_specular * pow(max(dot(ref, r.m_direction), 0.0f), SHININESS);
     }
 
-    return color;
+    return clamp(color, 0.0f, 1.0f);
   } else
     return vec3(BCKG_COLOR);
 }