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// Copyright 2009-2021 Intel Corporation
// SPDX-License-Identifier: Apache-2.0
#include "corona_loader.h"
#include "xml_parser.h"
#include "obj_loader.h"
namespace embree
{
class CoronaLoader
{
public:
static Ref<SceneGraph::Node> load(const FileName& fileName, const AffineSpace3fa& space);
CoronaLoader(const FileName& fileName, const AffineSpace3fa& space);
private:
template<typename T> T load(const Ref<XML>& xml) { assert(false); return T(zero); }
Ref<SceneGraph::MaterialNode> loadMaterial(const Ref<XML>& xml);
void loadMaterialDefinition(const Ref<XML>& xml);
std::shared_ptr<Texture> loadMap(const Ref<XML>& xml);
void loadMapDefinition(const Ref<XML>& xml);
Ref<SceneGraph::Node> loadMaterialLibrary(const FileName& fileName);
Ref<SceneGraph::Node> loadObject(const Ref<XML>& xml);
std::pair<Ref<SceneGraph::MaterialNode>, avector<AffineSpace3fa> > loadInstances(const Ref<XML>& xml);
Ref<SceneGraph::Node> loadGroupNode(const Ref<XML>& xml);
Ref<SceneGraph::Node> loadNode(const Ref<XML>& xml);
private:
FileName path;
std::map<std::string,Ref<SceneGraph::MaterialNode> > materialMap;
std::map<std::string,std::shared_ptr<Texture>> textureMap;
std::map<std::string,std::shared_ptr<Texture>> textureFileMap;
public:
Ref<SceneGraph::Node> root;
};
template<> FileName CoronaLoader::load<FileName>(const Ref<XML>& xml)
{
if (xml->body.size() != 1) THROW_RUNTIME_ERROR(xml->loc.str()+": wrong FileName body");
return xml->body[0].Identifier();
}
template<> std::string CoronaLoader::load<std::string>(const Ref<XML>& xml)
{
if (xml->body.size() != 1) THROW_RUNTIME_ERROR(xml->loc.str()+": wrong string body");
return xml->body[0].Identifier();
}
template<> int CoronaLoader::load<int>(const Ref<XML>& xml) {
if (xml->body.size() < 1) THROW_RUNTIME_ERROR(xml->loc.str()+": wrong int body");
return xml->body[0].Int();
}
template<> float CoronaLoader::load<float>(const Ref<XML>& xml) {
if (xml->body.size() < 1) THROW_RUNTIME_ERROR(xml->loc.str()+": wrong float body");
return xml->body[0].Float();
}
template<> Vec3f CoronaLoader::load<Vec3f>(const Ref<XML>& xml) {
if (xml->body.size() < 3) THROW_RUNTIME_ERROR(xml->loc.str()+": wrong float3 body");
return Vec3f(xml->body[0].Float(),xml->body[1].Float(),xml->body[2].Float());
}
template<> Vec3fa CoronaLoader::load<Vec3fa>(const Ref<XML>& xml) {
if (xml->body.size() < 3) THROW_RUNTIME_ERROR(xml->loc.str()+": wrong float3 body");
return Vec3fa(xml->body[0].Float(),xml->body[1].Float(),xml->body[2].Float());
}
template<> AffineSpace3fa CoronaLoader::load<AffineSpace3fa>(const Ref<XML>& xml)
{
if (xml->body.size() != 12) THROW_RUNTIME_ERROR(xml->loc.str()+": wrong AffineSpace body");
return AffineSpace3fa(LinearSpace3fa(xml->body[0].Float(),xml->body[1].Float(),xml->body[ 2].Float(),
xml->body[4].Float(),xml->body[5].Float(),xml->body[ 6].Float(),
xml->body[8].Float(),xml->body[9].Float(),xml->body[10].Float()),
Vec3fa(xml->body[3].Float(),xml->body[7].Float(),xml->body[11].Float()));
}
Ref<SceneGraph::MaterialNode> CoronaLoader::loadMaterial(const Ref<XML>& xml)
{
if (xml->name != "material")
THROW_RUNTIME_ERROR(xml->loc.str()+": invalid material: "+xml->name);
/* native material */
if (xml->parm("class") == "Native")
{
/* we convert into an OBJ material */
Ref<OBJMaterial> objmaterial = new OBJMaterial;
for (auto child : xml->children)
{
if (child->name == "diffuse") {
objmaterial->Kd = load<Vec3fa>(child);
if (child->children.size() && child->children[0]->name == "map")
objmaterial->_map_Kd = loadMap(child->children[0]);
}
else if (child->name == "reflect") {
objmaterial->Ks = load<Vec3fa>(child->child("color"));
objmaterial->Ni = load<float >(child->child("ior"));
objmaterial->Ns = load<float >(child->child("glossiness"));
}
else if (child->name == "translucency") {
objmaterial->Kt = load<Vec3fa>(child->child("color"));
}
else if (child->name == "opacity") {
objmaterial->d = load<Vec3fa>(child).x;
if (child->children.size() && child->children[0]->name == "map")
objmaterial->_map_d = loadMap(child->children[0]);
}
}
return objmaterial.dynamicCast<SceneGraph::MaterialNode>();
}
/* reference by name */
else if (xml->parm("class") == "Reference")
{
const std::string name = load<std::string>(xml);
return materialMap[name];
}
/* else return default material */
else
return new OBJMaterial;
}
void CoronaLoader::loadMaterialDefinition(const Ref<XML>& xml)
{
if (xml->name != "materialDefinition")
THROW_RUNTIME_ERROR(xml->loc.str()+": invalid material definition: "+xml->name);
if (xml->children.size() != 1)
THROW_RUNTIME_ERROR(xml->loc.str()+": invalid material definition");
const std::string name = xml->parm("name");
materialMap[name] = loadMaterial(xml->children[0]);
}
std::shared_ptr<Texture> CoronaLoader::loadMap(const Ref<XML>& xml)
{
/* process map node */
if (xml->name == "map")
{
std::string mapClass = xml->parm("class");
/* load textures */
if (mapClass == "Texture")
{
const FileName src = load<FileName>(xml->child("image"));
/* load images only once */
if (textureFileMap.find(src) != textureFileMap.end())
return textureFileMap[src];
try {
return Texture::load(path+src);
} catch (const std::runtime_error& e) {
std::cerr << "failed to load " << path+src << ": " << e.what() << std::endl;
}
}
else if (mapClass == "Reference") {
const std::string name = load<std::string>(xml);
return textureMap[name];
}
}
/* recurse into every unknown node to find some texture */
for (auto child : xml->children) {
std::shared_ptr<Texture> texture = loadMap(child);
if (texture) return texture;
}
return std::shared_ptr<Texture>();
}
void CoronaLoader::loadMapDefinition(const Ref<XML>& xml)
{
if (xml->name != "mapDefinition")
THROW_RUNTIME_ERROR(xml->loc.str()+": invalid map definition: "+xml->name);
if (xml->children.size() != 1)
THROW_RUNTIME_ERROR(xml->loc.str()+": invalid map definition");
const std::string name = xml->parm("name");
std::shared_ptr<Texture> texture = loadMap(xml->children[0]);
if (texture) textureMap[name] = texture;
}
Ref<SceneGraph::Node> CoronaLoader::loadMaterialLibrary(const FileName& fileName)
{
Ref<XML> xml = parseXML(path+fileName,"/.-",false);
if (xml->name != "mtlLib")
THROW_RUNTIME_ERROR(xml->loc.str()+": invalid material library");
for (auto child : xml->children)
{
if (child->name == "materialDefinition") {
loadMaterialDefinition(child);
}
else if (child->name == "mapDefinition")
loadMapDefinition(child);
}
return nullptr;
}
Ref<SceneGraph::Node> CoronaLoader::loadObject(const Ref<XML>& xml)
{
if (xml->name != "object")
THROW_RUNTIME_ERROR(xml->loc.str()+": invalid object node");
if (xml->parm("class") != "file")
THROW_RUNTIME_ERROR(xml->loc.str()+": invalid object class");
const FileName fileName = load<FileName>(xml);
return SceneGraph::load(path+fileName);
}
std::pair<Ref<SceneGraph::MaterialNode>, avector<AffineSpace3fa> > CoronaLoader::loadInstances(const Ref<XML>& xml)
{
if (xml->name != "instance")
THROW_RUNTIME_ERROR(xml->loc.str()+": invalid instance node");
/* create default material */
Ref<SceneGraph::MaterialNode> material = new OBJMaterial;
avector<AffineSpace3fa> xfms;
for (size_t i=0; i<xml->children.size(); i++)
{
Ref<XML> child = xml->children[i];
if (child->name == "material" ) material = loadMaterial(child);
else if (child->name == "transform") xfms.push_back(load<AffineSpace3fa>(child));
else THROW_RUNTIME_ERROR(child->loc.str()+": unknown node: "+child->name);
}
return std::make_pair(material,xfms);
}
Ref<SceneGraph::Node> CoronaLoader::loadGroupNode(const Ref<XML>& xml)
{
if (xml->children.size() < 1)
THROW_RUNTIME_ERROR(xml->loc.str()+": invalid group node");
/* load instances */
auto p = loadInstances(xml->children[0]);
Ref<SceneGraph::MaterialNode> material = p.first;
avector<AffineSpace3fa>& xfms = p.second;
/* load meshes */
Ref<SceneGraph::GroupNode> objects = new SceneGraph::GroupNode;
for (size_t i=1; i<xml->children.size(); i++)
objects->add(loadObject(xml->children[i]));
/* force material */
objects->setMaterial(material);
/* create instances */
Ref<SceneGraph::GroupNode> instances = new SceneGraph::GroupNode;
for (size_t i=0; i<xfms.size(); i++)
instances->add(new SceneGraph::TransformNode(xfms[i],objects.cast<SceneGraph::Node>()));
return instances.cast<SceneGraph::Node>();
}
Ref<SceneGraph::Node> CoronaLoader::loadNode(const Ref<XML>& xml)
{
if (xml->name == "conffile" ) return nullptr;
else if (xml->name == "mtllib" ) return loadMaterialLibrary(load<FileName>(xml));
else if (xml->name == "camera" ) return nullptr;
else if (xml->name == "environment" ) return nullptr;
else if (xml->name == "geometryGroup") return loadGroupNode(xml);
else if (xml->name == "renderElement") return nullptr;
else THROW_RUNTIME_ERROR(xml->loc.str()+": unknown tag: "+xml->name);
return nullptr;
}
Ref<SceneGraph::Node> CoronaLoader::load(const FileName& fileName, const AffineSpace3fa& space) {
CoronaLoader loader(fileName,space); return loader.root;
}
CoronaLoader::CoronaLoader(const FileName& fileName, const AffineSpace3fa& space)
{
path = fileName.path();
Ref<XML> xml = parseXML(fileName,"/.-",false);
if (xml->name == "scene")
{
Ref<SceneGraph::GroupNode> group = new SceneGraph::GroupNode;
for (size_t i=0; i<xml->children.size(); i++) {
group->add(loadNode(xml->children[i]));
}
root = group.cast<SceneGraph::Node>();
}
else
THROW_RUNTIME_ERROR(xml->loc.str()+": invalid scene tag");
if (space == AffineSpace3fa(one))
return;
root = new SceneGraph::TransformNode(space,root);
}
/*! read from disk */
Ref<SceneGraph::Node> SceneGraph::loadCorona(const FileName& fileName, const AffineSpace3fa& space) {
return CoronaLoader::load(fileName,space);
}
}
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