Code clean up and refactoring.

tracer.cpp

@@ -0,0 +1,57 @@
+#include <limits>
+#include <cstdlib>
+#include <cmath>
+
+#include <omp.h>
+
+#include "tracer.hpp"
+
+using namespace std;
+
+static const vec3 BCKG_COLOR = vec3(0.16f, 0.66f, 0.72f);
+
+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(int h, int w, float fov): m_h(h), m_w(w), m_fov(fov) {
+  m_a_ratio = static_cast<float>(w) / h;
+}
+
+vec2 Tracer::sample_pixel(int i, int j) const {
+  float pxNDC;
+  float pyNDC;
+  float pxS;
+  float pyS;
+  pyNDC = (static_cast<float>(i) + random01()) / m_h;
+  pyS = (1.0f - (2.0f * pyNDC)) * tan(radians(m_fov) / 2);
+  pxNDC = (static_cast<float>(j) + random01()) / m_w;
+  pxS = (2.0f * pxNDC) - 1.0f;
+  pxS *= m_a_ratio * tan(radians(m_fov) / 2);
+
+  return vec2(pxS, pyS);
+}
+
+vec3 Tracer::trace_ray(Ray & r, vector<Figure *> & vf, vector<Light *> & vl, unsigned int rec_level) const {
+  float t;
+  float _t;
+  Figure * _f;
+  vec3 n;
+
+  t = numeric_limits<float>::max();
+  _f = NULL;
+  
+  for (size_t f = 0; f < vf.size(); f++) {
+    if (vf[f]->intersect(r, _t, n) && _t < t) {
+      t = _t;
+      _f = vf[f];
+    }
+  }
+  
+  if (_f != NULL)
+    return _f->color;
+  else
+    return vec3(BCKG_COLOR);
+}