LightEnv::LightEnv( const std::string& envFilename )
: m_fLightAttenuation(40.0f)
{
std::ifstream fileStream(envFilename.c_str());
if(!fileStream.is_open())
throw std::runtime_error("Could not find the mesh file.");
TiXmlDocument theDoc;
fileStream >> theDoc;
fileStream.close();
if(theDoc.Error())
throw std::runtime_error(theDoc.ErrorDesc());
TiXmlHandle docHandle(&theDoc);
const TiXmlElement *pRootNode = docHandle.FirstChild("lightenv").ToElement();
if(!pRootNode)
throw std::runtime_error("The root node must be a 'lightenv' element.");
pRootNode->QueryFloatAttribute("atten", &m_fLightAttenuation);
m_fLightAttenuation = 1.0f / (m_fLightAttenuation * m_fLightAttenuation);
const TiXmlElement *pSunNode = docHandle.FirstChild("lightenv").FirstChild("sun").ToElement();
if(!pSunNode)
throw std::runtime_error("There must be a 'lightenv' element that has a 'sun' element as a child.");
float timerTime = 0;
if(pSunNode->QueryFloatAttribute("time", &timerTime) != TIXML_SUCCESS)
throw std::runtime_error("'sun' elements must have a 'time' attribute that is a float.");
m_sunTimer = Framework::Timer(Framework::Timer::TT_LOOP, timerTime);
LightVector ambient;
LightVector light;
LightVector background;
MaxIntensityVector maxIntensity;
for(const TiXmlElement *pKeyElem = pSunNode->FirstChildElement("key");
pKeyElem;
pKeyElem = pKeyElem->NextSiblingElement("key"))
{
float keyTime = 0;
if(pKeyElem->QueryFloatAttribute("time", &keyTime) != TIXML_SUCCESS)
throw std::runtime_error("'key' elements must have a 'time' attribute that is a float.");
//Convert from hours to normalized time.
keyTime = keyTime / 24.0f;
std::string strVec4;
if(pKeyElem->QueryStringAttribute("ambient", &strVec4) != TIXML_SUCCESS)
throw std::runtime_error("'key' elements must have an 'ambient' attribute.");
ambient.push_back(LightData(ParseVec4(strVec4), keyTime));
if(pKeyElem->QueryStringAttribute("intensity", &strVec4) != TIXML_SUCCESS)
throw std::runtime_error("'key' elements must have a 'intensity' attribute.");
light.push_back(LightData(ParseVec4(strVec4), keyTime));
if(pKeyElem->QueryStringAttribute("background", &strVec4) != TIXML_SUCCESS)
throw std::runtime_error("'key' elements must have a 'background' attribute.");
background.push_back(LightData(ParseVec4(strVec4), keyTime));
maxIntensity.push_back(MaxIntensityData(0.0f, keyTime));
if(pKeyElem->QueryFloatAttribute("max-intensity", &maxIntensity.back().first) != TIXML_SUCCESS)
throw std::runtime_error("'key' elements must have a 'max-intensity' attribute that is a float.");
}
if(ambient.empty())
throw std::runtime_error("'sun' element must have at least one 'key' element child.");
m_ambientInterpolator.SetValues(ambient);
m_sunlightInterpolator.SetValues(light);
m_backgroundInterpolator.SetValues(background);
m_maxIntensityInterpolator.SetValues(maxIntensity);
const TiXmlElement *pLightNode = docHandle.FirstChild("lightenv").FirstChild("light").ToElement();
for(; pLightNode; pLightNode = pLightNode->NextSiblingElement("light"))
{
if(m_lightPos.size() + 1 == MAX_NUMBER_OF_LIGHTS)
throw std::runtime_error("Too many lights specified.");
float lightTime = 0;
if(pLightNode->QueryFloatAttribute("time", &lightTime) != TIXML_SUCCESS)
throw std::runtime_error("'light' elements must have a 'time' attribute that is a float.");
m_lightTimers.push_back(Framework::Timer(Framework::Timer::TT_LOOP, lightTime));
std::string strVec4;
if(pLightNode->QueryStringAttribute("intensity", &strVec4) != TIXML_SUCCESS)
throw std::runtime_error("'light' elements must have an 'intensity' attribute.");
m_lightIntensity.push_back(ParseVec4(strVec4));
std::vector<glm::vec3> posValues;
for(const TiXmlElement *pKeyElem = pLightNode->FirstChildElement("key");
pKeyElem;
pKeyElem = pKeyElem->NextSiblingElement("key"))
{
posValues.push_back(ParseVec3(pKeyElem->GetText()));
}
if(posValues.empty())
throw std::runtime_error("'light' elements must have at least one 'key' element child.");
m_lightPos.push_back(LightInterpolator());
m_lightPos.back().SetValues(posValues);
}
}
LightEnv::LightEnv( const std::string& envFilename )
: m_fLightAttenuation(40.0f)
{
std::ifstream fileStream(envFilename.c_str());
if(!fileStream.is_open())
throw std::runtime_error("Could not find the mesh file.");
std::vector<char> fileData;
fileData.reserve(2000);
fileData.insert(fileData.end(), std::istreambuf_iterator<char>(fileStream),
std::istreambuf_iterator<char>());
fileData.push_back('\0');
xml_document<> doc;
try
{
doc.parse<0>(&fileData[0]);
}
catch(rapidxml::parse_error &e)
{
std::cout << envFilename << ": Parse error in light environment file." << std::endl;
std::cout << e.what() << std::endl << e.where<char>() << std::endl;
throw;
}
xml_node<> *pRootNode = doc.first_node("lightenv");
PARSE_THROW(pRootNode, ("lightenv node not found in light environment file: " + envFilename));
m_fLightAttenuation = rapidxml::get_attrib_float(*pRootNode, "atten", m_fLightAttenuation);
m_fLightAttenuation = 1.0f / (m_fLightAttenuation * m_fLightAttenuation);
xml_node<> *pSunNode = pRootNode->first_node("sun");
PARSE_THROW(pSunNode, "lightenv node must have a first child that is called `sun`.");
m_sunTimer = Framework::Timer(Framework::Timer::TT_LOOP,
rapidxml::get_attrib_float(*pSunNode, "time", ThrowAttrib));
LightVector ambient;
LightVector light;
LightVector background;
MaxIntensityVector maxIntensity;
for(const xml_node<> *pKeyNode = pSunNode->first_node("key");
pKeyNode;
pKeyNode = pKeyNode->next_sibling("key"))
{
float keyTime = rapidxml::get_attrib_float(*pKeyNode, "time", ThrowAttrib);
//Convert from hours to normalized time.
keyTime = keyTime / 24.0f;
ambient.push_back(LightData(
rapidxml::get_attrib_vec4(*pKeyNode, "ambient", ThrowAttrib), keyTime));
light.push_back(LightData(
rapidxml::get_attrib_vec4(*pKeyNode, "intensity", ThrowAttrib), keyTime));
background.push_back(LightData(
rapidxml::get_attrib_vec4(*pKeyNode, "background", ThrowAttrib), keyTime));
maxIntensity.push_back(MaxIntensityData(
rapidxml::get_attrib_float(*pKeyNode, "max-intensity", ThrowAttrib), keyTime));
}
if(ambient.empty())
throw std::runtime_error("'sun' element must have at least one 'key' element child.");
m_ambientInterpolator.SetValues(ambient);
m_sunlightInterpolator.SetValues(light);
m_backgroundInterpolator.SetValues(background);
m_maxIntensityInterpolator.SetValues(maxIntensity);
for(xml_node<> *pLightNode = pRootNode->first_node("light");
pLightNode;
pLightNode = pLightNode->next_sibling("light"))
{
if(m_lightPos.size() + 1 == MAX_NUMBER_OF_LIGHTS)
throw std::runtime_error("Too many lights specified.");
m_lightTimers.push_back(Framework::Timer(
Framework::Timer::TT_LOOP,
rapidxml::get_attrib_float(*pLightNode, "time", ThrowAttrib)));
m_lightIntensity.push_back(rapidxml::get_attrib_vec4(
*pLightNode, "intensity", ThrowAttrib));
std::vector<glm::vec3> posValues;
for(xml_node<> *pKeyNode = pLightNode->first_node("key");
pKeyNode;
pKeyNode = pKeyNode->next_sibling("key"))
{
posValues.push_back(ParseVec3(make_string(*pKeyNode)));
}
if(posValues.empty())
throw std::runtime_error("'light' elements must have at least one 'key' element child.");
m_lightPos.push_back(LightInterpolator());
m_lightPos.back().SetValues(posValues);
}
}