1 files changed, 131 insertions, 0 deletions
diff --git a/hw6/src/sceneIO_light.cpp b/hw6/src/sceneIO_light.cpp
new file mode 100644
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+++ b/hw6/src/sceneIO_light.cpp
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+/******************************************************************/
+/* This file is part of the homework assignments for CSCI-427/527 */
+/* at The College of William & Mary and authored by Pieter Peers. */
+/* No part of this file, whether altered or in original form, can */
+/* be distributed or used outside the context of CSCI-427/527     */
+/* without consent of either the College of William & Mary or     */
+/* Pieter Peers.                                                  */
+/******************************************************************/
+#include <cassert>
+
+#include "errorMessage.h"
+#include "random_number.h"
+
+#include "sceneIO_core.h"
+#include "sceneIO_basis.h"
+#include "sceneIO_light.h"
+#include "sceneIO_texture.h"
+#include "sceneIO_material.h"
+#include "sceneIO_geometry.h"
+
+#include "spotLightsource.h"
+#include "areaLightsource.h"
+#include "pointLightsource.h"
+#include "directionalLightsource.h"
+
+#include "lightsourceGeometry.h"
+
+static std::shared_ptr<const lightsource_base> importDirectionalLight(const XMLNode& node)
+{
+  // get properties
+  vec3d direction = getVec3d(node, "direction", vec3d(0.0f, 0.0f, 1.0f));
+  color power = getColor(node, "power", color(1.0f, 1.0f, 1.0f));
+                                
+  // Done.
+  return std::shared_ptr<const lightsource_base>( new directionalLightsource( direction, power));
+}
+
+
+static std::shared_ptr<const lightsource_base> importPointLight(const XMLNode& node)
+{
+  // get properties
+  vec3d position = getVec3d(node, "position", vec3d(0.0f, 0.0f, 0.0f));
+  color power = getColor(node, "power", color(1.0f, 1.0f, 1.0f));
+  vec3d attenuation = getVec3d(node, "attenuation", vec3d(0.0f, 0.0f, 1.0f));
+
+  // Done
+  return std::shared_ptr<const lightsource_base>( new pointLightsource(position, power, attenuation)); 
+}
+
+
+static std::shared_ptr<const lightsource_base> importSpotLight(const XMLNode& node)
+{
+  // Get properties
+  vec3d position = getVec3d(node, "position", vec3d(0.0f, 0.0f, 0.0f));
+  vec3d direction = getVec3d(node, "direction", vec3d(0.0f, 0.0f, 1.0f));
+  float cutoff = getFloat(node, "cutoff", 30.0f);
+  float sharpness = getFloat(node, "sharpness", 1.0f);
+  color power = getColor(node, "power", color(1.0f, 1.0f, 1.0f));
+  vec3d attenuation = getVec3d(node, "attenuation", vec3d(0.0f, 0.0f, 1.0f));
+
+  // Done.
+  return std::shared_ptr<const lightsource_base>(new spotLightsource( position, direction, cutoff, sharpness, power, attenuation ));
+}
+
+
+static std::shared_ptr<const lightsource_base> importAreaLight(const XMLNode& node, nodeCache<boundedPrimitive>& shape_cache, nodeCache<shader_base>& shader_cache, nodeCache<texture_base>& texture_cache, const std::string& rootDir)
+{
+  // get properties
+  color power = getColor(node, "power", color(1.0f, 1.0f, 1.0f));
+  vec3d attenuation = getVec3d(node, "attenuation", vec3d(0.0f, 0.0f, 1.0f));
+
+  // node properties
+  std::shared_ptr<const shader_base> reflectanceMaterial;
+  std::shared_ptr<const boundedPrimitive> geometry;
+
+  // get children
+  for(XMLNode child = node.firstChild(); child.isValid(); child++)
+  {
+    std::string name = child.name();
+
+    // general child nodes
+    auto tempMat = importMaterial(child, shader_cache, texture_cache, rootDir);
+    auto tempGeom = importGeometry(child, shape_cache, shader_cache, texture_cache, rootDir);
+
+    // specific child nodes
+    if(tempMat) reflectanceMaterial = tempMat;
+    else if(tempGeom) geometry = tempGeom;
+    else errorMessage("Unknown child-node in areaLightsource (%s).", name.c_str());
+  }
+  
+  // produce warning if shader defined on the geometry
+  if(geometry && geometry->hasShader() && !reflectanceMaterial)
+    warningMessage("Any shader defined on the geometry are ignored in AreaLightsource. Define a reflectance material explicitely in AreaLightsource instead.");
+
+  // Create
+  // 1) light source
+  // 2) light source geometry
+  std::shared_ptr<const lightsource_base> ls( new areaLightsource(power, geometry, attenuation) );
+  std::shared_ptr<boundedPrimitive> lsShape( new lightsourceGeometry(geometry, ls, reflectanceMaterial) );
+
+  // Add lsShape to shape_cache
+  char id[32]; sprintf(id, "lightgeometry-%u", random_int());
+shape_cache.add(std::string(id), lsShape);
+
+  // Done.
+  return ls;
+}
+
+
+std::shared_ptr<const lightsource_base> importLight(const XMLNode& node, nodeCache<boundedPrimitive>& shape_cache, nodeCache<shader_base>& shader_cache, nodeCache<texture_base>& texture_cache, const std::string& rootDir)
+{
+  // sanity check
+  assert(node.name() == "light");
+
+  // get light source type
+  std::string type = getString(node, "type", "directional");
+ 
+  // create light source
+  std::shared_ptr<const lightsource_base> ls;
+  if(type == "directional") ls = importDirectionalLight(node);
+  else if(type == "point") ls = importPointLight(node);
+  else if(type == "spot") ls = importSpotLight(node);
+  else if(type == "area") ls = importAreaLight(node, shape_cache, shader_cache, texture_cache, rootDir);
+  else errorMessage("Unknown light source type (%s)", type.c_str());
+
+  // Done.
+  return ls;
+}
+
+
+