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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 "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;
}
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