Added groundwork for area lights. Added irony-mode CDB.

.clang_complete

@@ -0,0 +1,5 @@
+-ansi
+-pedantic
+-Wall
+-DGLM_FORCE_RADIANS
+-fopenmp

directional_light.hpp

@@ -8,11 +8,11 @@
 
 using glm::normalize;
 
-class DirectionalLight: public Light {
+class DirectionalLight: public InfinitesimalLight {
 public:
-  DirectionalLight(): Light() { }
+  DirectionalLight(): InfinitesimalLight() { }
 
-  DirectionalLight(vec3 _p, vec3 _d, vec3 _s): Light(normalize(_p), _d, _s) { }
+  DirectionalLight(vec3 _p, vec3 _d, vec3 _s): InfinitesimalLight(normalize(_p), _d, _s) { }
 
   virtual vec3 direction(vec3 point);
   virtual float distance(vec3 point);

light.hpp

@@ -11,6 +11,8 @@ using glm::vec3;
 
 class Light {
 public:
+  typedef enum LIGHT_TYPE { INFINITESIMAL = 0, AREA } ltype_t;
+
   vec3 m_position;
   vec3 m_diffuse;
   vec3 m_specular;
@@ -21,6 +23,45 @@ public:
   
   virtual ~Light() { }
 
+  virtual ltype_t light_type() {
+    return type;
+  }
+  
+  virtual vec3 direction(vec3 point) = 0;
+  virtual float distance(vec3 point) = 0;
+  virtual vec3 diffuse(vec3 normal, Ray & r, vec3 i_pos, Material & m) const = 0;
+  virtual vec3 specular(vec3 normal, Ray & r, vec3 i_pos, Material & m) const = 0;
+
+protected:
+  ltype_t type;
+};
+
+class InfinitesimalLight: public Light {
+public:
+  InfinitesimalLight(): Light() {
+    type = INFINITESIMAL;
+  }
+  
+  InfinitesimalLight(vec3 _p, vec3 _d, vec3 _s): Light(_p, _d, _s) {
+    type = INFINITESIMAL;
+  }
+  
+  virtual vec3 direction(vec3 point) = 0;
+  virtual float distance(vec3 point) = 0;
+  virtual vec3 diffuse(vec3 normal, Ray & r, vec3 i_pos, Material & m) const = 0;
+  virtual vec3 specular(vec3 normal, Ray & r, vec3 i_pos, Material & m) const = 0;
+};
+
+class AreaLight: public Light {
+public:
+  AreaLight(): Light() {
+    type = AREA;
+  }
+
+  AreaLight(vec3 _p, vec3 _d, vec3 _s): Light(_p, _d, _s) {
+    type = AREA;
+  }
+  
   virtual vec3 direction(vec3 point) = 0;
   virtual float distance(vec3 point) = 0;
   virtual vec3 diffuse(vec3 normal, Ray & r, vec3 i_pos, Material & m) const = 0;

path_tracer.cpp

@@ -42,6 +42,7 @@ vec3 PathTracer::trace_ray(Ray & r, Scene * s, unsigned int rec_level) const {
 	// For every light source
 	vis = true;
 
+	if (s->m_lights[l]->light_type() == Light::INFINITESIMAL) {
 	  // Cast a shadow ray to determine visibility.
 	  sr = Ray(s->m_lights[l]->direction(i_pos), i_pos + n * BIAS);
 	  for (size_t f = 0; f < s->m_figures.size(); f++) {
@@ -50,6 +51,10 @@ vec3 PathTracer::trace_ray(Ray & r, Scene * s, unsigned int rec_level) const {
 	      break;
 	    }
 	  }
+	} else if (s->m_lights[l]->light_type() == Light::AREA) {
+	  // Area lights not supported with Whitted ray tracing.
+	  vis = false;
+	}
 
 	// Evaluate the shading model accounting for visibility.
 	dir_diff_color += vis ? s->m_lights[l]->diffuse(n, r, i_pos, *_f->m_mat) : vec3(0.0f);

point_light.hpp

@@ -4,15 +4,15 @@
 
 #include "light.hpp"
 
-class PointLight: public Light {
+class PointLight: public InfinitesimalLight {
 public:
   float m_const_att;
   float m_lin_att;
   float m_quad_att;
 
-  PointLight(): Light(), m_const_att(1.0f), m_lin_att(0.0f), m_quad_att(0.0f) { }
+  PointLight(): InfinitesimalLight(), m_const_att(1.0f), m_lin_att(0.0f), m_quad_att(0.0f) { }
 
-  PointLight(vec3 _p, vec3 _d, vec3 _s, float _c, float _l, float _q): Light(_p, _d, _s), m_const_att(_c), m_lin_att(_l), m_quad_att(_q) { }
+  PointLight(vec3 _p, vec3 _d, vec3 _s, float _c, float _l, float _q): InfinitesimalLight(_p, _d, _s), m_const_att(_c), m_lin_att(_l), m_quad_att(_q) { }
 
   virtual vec3 direction(vec3 point);
   virtual float distance(vec3 point);

whitted_tracer.cpp

@@ -36,11 +36,13 @@ vec3 WhittedTracer::trace_ray(Ray & r, Scene * s, unsigned int rec_level) const
     
     // Check if the material is not reflective/refractive.
     if (!_f->m_mat->m_refract) {
+
       // Calculate the direct lighting.
       for (size_t l = 0; l < s->m_lights.size(); l++) {
 	// For every light source
 	vis = true;
 
+	if (s->m_lights[l]->light_type() == Light::INFINITESIMAL) {
 	  // Cast a shadow ray to determine visibility.
 	  sr = Ray(s->m_lights[l]->direction(i_pos), i_pos + n * BIAS);
 	  for (size_t f = 0; f < s->m_figures.size(); f++) {
@@ -49,6 +51,10 @@ vec3 WhittedTracer::trace_ray(Ray & r, Scene * s, unsigned int rec_level) const
 	      break;
 	    }
 	  }
+	} else if (s->m_lights[l]->light_type() == Light::AREA) {
+	  // Area lights not supported with Whitted ray tracing.
+	  vis = false;
+	}
 
 	// Evaluate the shading model accounting for visibility.
 	dir_diff_color += vis ? s->m_lights[l]->diffuse(n, r, i_pos, *_f->m_mat) : vec3(0.0f);