OpenSpace/modules/iswa/rendering/datasphere.cpp

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 * OpenSpace                                                                             *
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 * Copyright (c) 2014-2018                                                               *
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#include <modules/iswa/rendering/datasphere.h>

#include <openspace/engine/globals.h>
#include <openspace/rendering/renderengine.h>
#include <openspace/util/powerscaledscalar.h>
#include <openspace/util/powerscaledsphere.h>
#include <modules/iswa/util/dataprocessorjson.h>
#include <modules/iswa/rendering/iswabasegroup.h>
#include <ghoul/filesystem/filesystem.h>
#include <ghoul/opengl/programobject.h>
#include <ghoul/glm.h>

namespace openspace {

DataSphere::DataSphere(const ghoul::Dictionary& dictionary)
    : DataCygnet(dictionary)
{
    _radius = dictionary.value<float>("Radius");
}

DataSphere::~DataSphere() {}

void DataSphere::initializeGL() {
    IswaCygnet::initializeGL();

    if (!_shader) {
        _shader = global::renderEngine.buildRenderProgram(
            "DataSphereProgram",
            absPath("${MODULE_ISWA}/shaders/datasphere_vs.glsl"),
            absPath("${MODULE_ISWA}/shaders/datasphere_fs.glsl")
        );
    }

    // Rotate 90 degrees because of the texture coordinates in PowerScaledSphere
    _rotation = glm::rotate(_rotation, glm::half_pi<float>(), glm::vec3(1.f, 0.f, 0.f));

    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) {
                _backgroundValues = _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);

    setPropertyCallbacks();
    _useHistogram = true;
    _autoFilter = true;
}

bool DataSphere::createGeometry() {
    PowerScaledScalar radius =  PowerScaledScalar(6.371f * _radius, 6.0);
    int segments = 100;
    _sphere = std::make_unique<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().empty()) { // 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->setDimensions();
    return _dataProcessor->processData(_dataBuffer, _dataOptions, _textureDimensions);
}

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

} //namespace openspace