added ambient parameter in global options{} for parser to set scene's global ambient color

git-svn-id: svn://anubis/fart/trunk@260 7f9b0f55-74a9-4bce-be96-3c2cd072584d

main/Scene-load.cc

@@ -198,6 +198,10 @@ void Scene::processOptions(refptr<Node> node)
         {
             m_max_depth = (*it)->getInteger();
         }
+        else if ( typeid(**it) == typeid(AmbientNode) )
+        {
+            setAmbientLight(Color((*it)->getVector()));
+        }
     }
 }
 

main/Scene.cc

@@ -230,6 +230,7 @@ Color Scene::computePhong(const refptr<Material> material,
         Vector lightPlaneX = directionToLightC.getPerpendicular().normalize();
         Vector lightPlaneY = (directionToLightC * lightPlaneX).normalize();
         int jitter_samples = 0, jitter_level = (*it)->getJitter();;
+        Color jitterResult;
         for (int jitter_index = 0; jitter_index < jitter_level; jitter_index++)
         {
             double jitterRadius = jitter_index * lightRadius
@@ -259,25 +260,26 @@ Color Scene::computePhong(const refptr<Material> material,
                     double diffuse_coef = directionToLight % surfaceNormal;
                     if (diffuse_coef > 0.0)
                     {
-                        result += diffuseColor
-                                * (*it)->getDiffuseColor()
-                                * diffuse_coef
-                                * light_contribution;
+                        jitterResult += diffuseColor
+                            * (*it)->getDiffuseColor()
+                            * diffuse_coef
+                            * light_contribution;
                     }
 
                     /* calculate the specular term */
                     double specular_coef = reflectedLightDirection % viewDirection;
                     if (specular_coef > 0.0)
                     {
-                        result += specularColor
-                                * (*it)->getSpecularColor()
-                                * pow(specular_coef, shininess)
-                                * light_contribution;
+                        jitterResult += specularColor
+                            * (*it)->getSpecularColor()
+                            * pow(specular_coef, shininess)
+                            * light_contribution;
                     }
                 }
             }
         }
-        result /= jitter_samples;
+        jitterResult /= jitter_samples;
+        result += jitterResult;
     }
 
     return result;

parser/parser.yy

@@ -311,6 +311,9 @@ options_item: WIDTH DEC_NUMBER {
             | EXPOSURE number {
                     $$ = new ExposureNode($2->getNumber());
                 }
+            | AMBIENT vector {
+                    $$ = new AmbientNode($2->getVector());
+                }
             ;
 
 plane: PLANE LCURLY plane_items RCURLY {

scenes/subtract-subtract.fart

@@ -4,6 +4,7 @@ scene
     options
     {
         multisample 3
+        ambient <0.2, 0.2, 0.2>
     }
 
     camera