OpenSpace/modules/iswa/rendering/screenspacecygnet.cpp

/*****************************************************************************************
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* OpenSpace                                                                             *
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* Copyright (c) 2014-2016                                                               *
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#include <modules/iswa/rendering/screenspacecygnet.h>
#include <ghoul/io/texture/texturereader.h>
#include <ghoul/filesystem/filesystem>
#include <openspace/util/time.h>
#include <modules/iswa/util/iswamanager.h>

namespace {
    const std::string _loggerCat = "ScreenSpaceCygnet";
}

namespace openspace {

// ScreenSpaceCygnet::ScreenSpaceCygnet(int cygnetId)
//     : ScreenSpaceRenderable()
//     , _updateInterval("updateInterval", "Update Interval", 1.0, 0.0 , 10.0)
//     , _cygnetId(cygnetId)
// {
//     setName("iSWACygnet" + std::to_string(_cygnetId));
//     addProperty(_updateInterval);

//     registerProperties();
// }

ScreenSpaceCygnet::ScreenSpaceCygnet(const ghoul::Dictionary& dictionary)
    : ScreenSpaceRenderable(dictionary)
    , _updateInterval("updateInterval", "Update Interval", 1.0, 0.0 , 10.0)
{
    // hacky, have to first get as float and then cast to int.
    float cygnetid;
    dictionary.getValue("CygnetId", cygnetid);
    _cygnetId = (int)cygnetid;
    
    setName("iSWACygnet" + std::to_string(_cygnetId));
    addProperty(_updateInterval);

    registerProperties();
}

ScreenSpaceCygnet::~ScreenSpaceCygnet(){}

bool ScreenSpaceCygnet::initialize(){
    _originalViewportSize = OsEng.windowWrapper().currentWindowResolution();
    createPlane();
    createShaders();
    updateTexture();

    _realTime = std::chrono::duration_cast<std::chrono::milliseconds>(std::chrono::system_clock::now().time_since_epoch());
    _lastUpdateRealTime = _realTime;

    return isReady();
}

bool ScreenSpaceCygnet::deinitialize(){
    OsEng.gui()._screenSpaceProperty.unregisterProperties(name());

    glDeleteVertexArrays(1, &_quad);
    _quad = 0;

    glDeleteBuffers(1, &_vertexPositionBuffer);
    _vertexPositionBuffer = 0;

    _texture = nullptr;

     RenderEngine& renderEngine = OsEng.renderEngine();
    if (_shader) {
        renderEngine.removeRenderProgram(_shader);
        _shader = nullptr;
    }

    _memorybuffer = "";
    return true;
}

void ScreenSpaceCygnet::render(){

    if(!isReady()) return;
    if(!_enabled) return;

    glm::mat4 rotation = rotationMatrix();
    glm::mat4 translation = translationMatrix();
    glm::mat4 scale = scaleMatrix();
    glm::mat4 modelTransform = rotation*translation*scale;

    draw(modelTransform);
}

void ScreenSpaceCygnet::update(){
    _realTime = std::chrono::duration_cast<std::chrono::milliseconds>(std::chrono::system_clock::now().time_since_epoch());
    int updateInterval = (int) (_updateInterval.value()*1000);
    bool timeToUpdate = ((_realTime.count()-_lastUpdateRealTime.count()) > updateInterval) &&
                        (Time::ref().deltaTime() != 0);

    if(updateInterval != 0 && (Time::ref().timeJumped() || timeToUpdate )){
        updateTexture();
        _lastUpdateRealTime = _realTime;
    }

    if(_futureTexture && _futureTexture->isFinished){
        loadTexture();
        _futureTexture = nullptr;
    }
}

bool ScreenSpaceCygnet::isReady() const{
    bool ready = true;
    if (!_shader)
        ready &= false;
    if(!_texture)
        ready &= false;
    return ready;
}

void ScreenSpaceCygnet::updateTexture(){
    // If a download is in progress, dont send another request.
    //What if image failed to download?
    if(_futureTexture && !_futureTexture->isFinished)
        return;

    _memorybuffer = "";
    std::shared_ptr<DownloadManager::FileFuture> future = ISWAManager::ref().downloadImageToMemory(_cygnetId, _memorybuffer);
    if(future){
        _futureTexture = future;
    }

}

void ScreenSpaceCygnet::loadTexture() {

    if(_memorybuffer != ""){

        std::string format;
        std::stringstream ss(_futureTexture->format);
        getline(ss, format ,'/');
        getline(ss, format);

        std::unique_ptr<ghoul::opengl::Texture> texture = ghoul::io::TextureReader::ref().loadTexture(
            (void*) _memorybuffer.c_str(), 
            _memorybuffer.size(), 
            format);
        // std::unique_ptr<ghoul::opengl::Texture> texture = ghoul::io::TextureReader::ref().loadTexture(absPath(_path));

        if (texture) {
            // LDEBUG("Loaded texture from '" << absPath(_path) << "'");

            texture->uploadTexture();
            // Textures of planets looks much smoother with AnisotropicMipMap rather than linear
            texture->setFilter(ghoul::opengl::Texture::FilterMode::Linear);

            _texture = std::move(texture);
        }
    }
}
}