OpenSpace/modules/iswa/rendering/datasphere.cpp

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 * OpenSpace                                                                             *
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 * Copyright (c) 2014-2017                                                               *
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#include <modules/iswa/rendering/datasphere.h>
#include <openspace/util/powerscaledsphere.h>
#include <modules/iswa/util/dataprocessorjson.h>

#include <ghoul/opengl/programobject.h>

#ifdef WIN32
#define _USE_MATH_DEFINES
#include <math.h>
#endif

namespace {
    const char* _loggerCat = "DataSphere";
} // namespace

namespace openspace {

DataSphere::DataSphere(const ghoul::Dictionary& dictionary)
    : DataCygnet(dictionary)
    , _sphere(nullptr)
{
    float radius;
    dictionary.getValue("Radius", radius);
    _radius = radius;

    _programName = "DataSphereProgram";
    _vsPath = "${MODULE_ISWA}/shaders/datasphere_vs.glsl";
    _fsPath = "${MODULE_ISWA}/shaders/datasphere_fs.glsl";
}

DataSphere::~DataSphere(){}

bool DataSphere::initialize(){
    IswaCygnet::initialize();

    //rotate 90 degrees because of the texture coordinates in PowerScaledSphere
    _rotation = glm::rotate(_rotation, (float)M_PI_2, glm::vec3(1.0, 0.0, 0.0));

    if(_group){
        _dataProcessor = _group->dataProcessor();
        subscribeToGroup();
    }else{
        _dataProcessor = std::make_shared<DataProcessorJson>();
        //If autofiler is on, background values property should be hidden
        _autoFilter.onChange([this](){
            // If autofiler is selected, use _dataProcessor to set backgroundValues 
            // and unregister backgroundvalues property.
            if(_autoFilter.value()){
                _backgroundValues.setValue(_dataProcessor->filterValues());
                _backgroundValues.setVisibility(properties::Property::Visibility::Hidden);
                //_backgroundValues.setVisible(false);
            // else if autofilter is turned off, register backgroundValues 
            } else {
                _backgroundValues.setVisibility(properties::Property::Visibility::All);
                //_backgroundValues.setVisible(true);
            }
        });
    }

    readTransferFunctions(_transferFunctionsFile.value());

    setPropertyCallbacks();
    _useHistogram.setValue(true);
    _autoFilter.setValue(true);

    return true;
}

bool DataSphere::createGeometry(){
    PowerScaledScalar radius =  PowerScaledScalar(6.371f*_radius, 6.0);
    int segments = 100;
    _sphere = std::make_shared<PowerScaledSphere>(radius, segments);
    _sphere->initialize();
    return true;
}

bool DataSphere::destroyGeometry(){
    _sphere = nullptr;
    return true;
}

void DataSphere::renderGeometry() const {
    glEnable(GL_CULL_FACE);
    glCullFace(GL_BACK);
    _sphere->render();
}

std::vector<float*> DataSphere::textureData(){
    // if the buffer in the datafile is empty, do not proceed
    if(_dataBuffer.empty())
        return std::vector<float*>();

    if(!_dataOptions.options().size()){ // load options for value selection
        fillOptions(_dataBuffer);
        _dataProcessor->addDataValues(_dataBuffer, _dataOptions);

        // if this datacygnet has added new values then reload texture
        // for the whole group, including this datacygnet, and return after.
        if(_group){
            _group->updateGroup();
            return std::vector<float*>();
        }
    }
    // _textureDimensions = _dataProcessor->dimensions();
    return _dataProcessor->processData(_dataBuffer, _dataOptions, _textureDimensions);
}

void DataSphere::setUniforms(){
    // set both data texture and transfer function texture
    setTextureUniforms();
    _shader->setUniform("backgroundValues", _backgroundValues.value());
    _shader->setUniform("transparency", _alpha.value());
}
} //namespace openspace