1 files changed, 147 insertions, 0 deletions
diff --git a/hw3/src/sceneIO_material.cpp b/hw3/src/sceneIO_material.cpp
new file mode 100644
index 0000000..018e913
--- /dev/null
+++ b/hw3/src/sceneIO_material.cpp
@@ -0,0 +1,147 @@
+/******************************************************************/
+/* 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 "sceneIO_xml.h"
+#include "sceneIO_core.h"
+#include "sceneIO_material.h"
+
+#include "compoundShader.h"
+#include "reflectanceParameter.h"
+#include "phongReflectanceShader.h"
+#include "diffuseReflectanceShader.h"
+
+//////////////////////////////////////////////////////////////
+static colorReflectanceParameter importColorReflectanceParameter(const XMLNode& node, nodeCache<texture_base>& texture_cache, const std::string& rootDir)
+{
+  // get parameter
+  color value = getColor(node, "value", color(0.0f, 0.0f, 0.0f));
+  
+  // create & return parameter, give preference to textured parameters
+  return colorReflectanceParameter(value);
+
+  // Done.
+}
+
+//////////////////////////////////////////////////////////////
+static scalarReflectanceParameter importScalarReflectanceParameter(const XMLNode& node, nodeCache<texture_base>& texture_cache, const std::string& rootDir)
+{
+  // get parameters
+  float value = getFloat(node, "value", 0.0f);
+  unsigned int channel = getInteger(node, "channel", 0);
+
+  // create & return parameter, give preference to textured parameters
+  return scalarReflectanceParameter(value);
+
+  // Done.
+}
+
+//////////////////////////////////////////////////////////////
+static std::shared_ptr<shader_base> importDiffuse(const XMLNode& node, nodeCache<shader_base>& shader_cache, nodeCache<texture_base>& texture_cache, const std::string& rootDir)
+{
+  // sanity check
+  assert(node.name() == "diffuse");
+
+  // parameter storage
+  colorReflectanceParameter albedo;
+
+  // check child nodes
+  for(XMLNode child=node.firstChild(); child.isValid(); child++)
+  {
+    std::string name = child.name();
+    if(name == "albedo") albedo = importColorReflectanceParameter(child, texture_cache, rootDir);
+    else errorMessage("Unknown parameter in diffuse-node (%s).", name.c_str());
+  }
+
+  // Done.
+  return std::shared_ptr<shader_base>(new diffuseReflectanceShader(albedo));
+}
+
+//////////////////////////////////////////////////////////////
+static std::shared_ptr<shader_base> importPhong(const XMLNode& node, nodeCache<shader_base>& shader_cache, nodeCache<texture_base>& texture_cache, const std::string& rootDir)
+{
+  // sanity check
+  assert(node.name() == "phong");
+
+  // parameter storage
+  colorReflectanceParameter albedo;
+  scalarReflectanceParameter sharpness;
+
+  // check child nodes
+  for(XMLNode child=node.firstChild(); child.isValid(); child++)
+  {
+    std::string name = child.name();
+    if(name == "albedo") albedo = importColorReflectanceParameter(child, texture_cache, rootDir);
+    else if(name == "sharpness") sharpness = importScalarReflectanceParameter(child, texture_cache, rootDir);
+    else errorMessage("Unknown parameter in phong-node (%s).", name.c_str());
+  }
+
+  // Done.
+  return std::shared_ptr<shader_base>(new phongReflectanceShader(albedo, sharpness));
+}
+
+//////////////////////////////////////////////////////////////
+static std::shared_ptr<shader_base> importCompoundMaterial(const XMLNode& node, nodeCache<shader_base>& shader_cache, nodeCache<texture_base>& texture_cache, const std::string& rootDir)
+{
+  // sanity check
+  assert(node.isValid() && node.name() == "material");
+
+  // storage for child material nodes
+  std::vector<std::shared_ptr<const shader_base>> shader_list;
+
+  // for each child
+  for(XMLNode child = node.firstChild(); child.isValid(); child++)
+  {
+    // try to import material
+    std::shared_ptr<shader_base> shader = importMaterial(child, shader_cache, texture_cache, rootDir);
+
+    // add to list if successful.
+    if(shader) shader_list.push_back(shader);
+    else errorMessage("Unknown material-node (%s).", child.name().c_str());
+  }
+
+  // Done.
+  return std::shared_ptr<shader_base>(new compoundShader(shader_list));
+}
+
+
+//////////////////////////////////////////////////////////////
+std::shared_ptr<shader_base> importMaterial(const XMLNode& node, nodeCache<shader_base>& shader_cache, nodeCache<texture_base>& texture_cache, const std::string& rootDir)
+{
+  std::string name = node.name();
+
+  // check material type
+  if(name != "material" &&
+     name != "diffuse" &&
+     name != "phong") return std::shared_ptr<shader_base>(nullptr);
+
+  // check if reference
+  std::string ref = getString(node, "ref");
+  std::shared_ptr<shader_base> shader = shader_cache.get(ref);
+  if(shader) return shader;
+  else if(ref != "") errorMessage("Unknown %s name (%s).", name.c_str(), ref.c_str());
+ 
+  // get id
+  std::string id = getString(node, "id");
+  if(shader_cache.get(id))
+    errorMessage("%s-id is not unique (%s).", name.c_str(), id.c_str());
+
+  // process primitives based on type
+  if(name == "material") shader = importCompoundMaterial(node, shader_cache, texture_cache, rootDir);
+  else if(name == "diffuse") shader = importDiffuse(node, shader_cache, texture_cache, rootDir);
+  else if(name == "phong") shader = importPhong(node, shader_cache, texture_cache, rootDir);
+  else errorMessage("Unknown material-node (%s).", name.c_str());
+
+  // update cache
+  if(id != "") shader_cache.add(id, shader);
+
+  // Done.
+  return shader;
+}
+