OpenSpace/modules/iswa/rendering/textureplane.cpp

// /*****************************************************************************************
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//  * OpenSpace                                                                             *
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//  * Copyright (c) 2014-2016                                                               *
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#include <modules/iswa/rendering/textureplane.h>
#include <openspace/engine/openspaceengine.h>
#include <openspace/rendering/renderengine.h>
//#include <ghoul/filesystem/filesystem>
#include <ghoul/io/texture/texturereader.h>
#include <ghoul/opengl/programobject.h>
#include <ghoul/opengl/texture.h>
#include <ghoul/opengl/textureunit.h>
#include <modules/kameleon/include/kameleonwrapper.h>
#include <openspace/scene/scene.h>
#include <openspace/scene/scenegraphnode.h>
#include <openspace/util/time.h>
#include <openspace/util/spicemanager.h>
#include <openspace/util/time.h>

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

namespace openspace {

TexturePlane::TexturePlane(const ghoul::Dictionary& dictionary)
    :CygnetPlane(dictionary)
    ,_futureTexture(nullptr)
{
    _id = id();
    std::string name;
    dictionary.getValue("Name", name);
    setName(name);
    registerProperties();
}


TexturePlane::~TexturePlane(){}

bool TexturePlane::initialize(){
    createPlane();
    createShader();
    updateTexture();

    return isReady();
}

bool TexturePlane::deinitialize(){
    unregisterProperties();
    destroyPlane();
    destroyShader();
    _memorybuffer = "";

    return true;
}

void TexturePlane::render(const RenderData& data){
    
    if(!_texture) return;
    
    psc position = data.position;
    glm::mat4 transform = glm::mat4(1.0);

    glm::mat4 rotx = glm::rotate(transform, static_cast<float>(M_PI_2), glm::vec3(1, 0, 0));
    glm::mat4 roty = glm::rotate(transform, static_cast<float>(M_PI_2), glm::vec3(0, -1, 0));
    glm::mat4 rotz = glm::rotate(transform, static_cast<float>(M_PI_2), glm::vec3(0, 0, 1));

    glm::mat4 rot = glm::mat4(1.0);
    for (int i = 0; i < 3; i++){
        for (int j = 0; j < 3; j++){
            transform[i][j] = static_cast<float>(_stateMatrix[i][j]);
        }
    }

    transform = transform * rotz * roty; //BATSRUS

    // Correct for the small error of x-axis not pointing directly at the sun
    if(_data->frame == "GSM"){
        glm::vec4 v(1,0,0,1);
        glm::vec3 xVec = glm::vec3(transform*v);
        xVec = glm::normalize(xVec);

        double  lt;
        glm::vec3 sunVec =
        SpiceManager::ref().targetPosition("SUN", "Earth", "GALACTIC", {}, _time, lt);
        sunVec = glm::normalize(sunVec);

        float angle = acos(glm::dot(xVec, sunVec));
        glm::vec3 ref =  glm::cross(xVec, sunVec);

        glm::mat4 rotation = glm::rotate(glm::mat4(1.0f), angle, ref); 
        transform = rotation * transform;
    }

    position += transform*glm::vec4(_data->offset.x, _data->offset.z, _data->offset.y, _data->offset.w);

    // Activate shader
    _shader->activate();
    glEnable(GL_ALPHA_TEST);
    glDisable(GL_CULL_FACE);
    _shader->setUniform("ViewProjection", OsEng.renderEngine().camera()->viewProjectionMatrix());
    _shader->setUniform("ModelTransform", transform);
    setPscUniforms(*_shader.get(), *OsEng.renderEngine().camera(), position);

    ghoul::opengl::TextureUnit unit;
    unit.activate();
    _texture->bind();
    _shader->setUniform("texture1", unit);

    glBindVertexArray(_quad);
    glDrawArrays(GL_TRIANGLES, 0, 6);
    glEnable(GL_CULL_FACE);

    _shader->deactivate();
}

void TexturePlane::update(const UpdateData& data){
    if(_planeIsDirty)
        createPlane();

    _time = Time::ref().currentTime();
    _stateMatrix = SpiceManager::ref().positionTransformMatrix("GALACTIC", _data->frame, _time);
    
    float openSpaceUpdateInterval = abs(Time::ref().deltaTime()*_updateInterval);
    if(openSpaceUpdateInterval){
        if(abs(_time-_lastUpdateTime) >= openSpaceUpdateInterval){
            updateTexture();
            _lastUpdateTime = _time;
        }
    }

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

bool TexturePlane::loadTexture() {
    // std::cout << _data->path << std::endl;
    // std::unique_ptr<ghoul::opengl::Texture> texture = ghoul::io::TextureReader::ref().loadTexture(absPath(_data->path));
    //std::unique_ptr<ghoul::opengl::Texture> texture = ghoul::io::TextureReader::ref().loadTexture(absPath("${OPENSPACE_DATA}/GM_openspace_Z0_20150315_000000.png"));
    if(_memorybuffer != ""){

         std::unique_ptr<ghoul::opengl::Texture> texture = ghoul::io::TextureReader::ref().loadTextureFromMemory(_memorybuffer);
        if (texture) {
            // LDEBUG("Loaded texture from '" << absPath(_data->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);
            
            return true;
        }
    }   

    return false;
}

bool TexturePlane::updateTexture(){
    _memorybuffer = "";
    std::shared_ptr<DownloadManager::FileFuture> future = ISWAManager::ref().downloadImageToMemory(_data->id, _memorybuffer);

    // std::shared_ptr<DownloadManager::FileFuture> future = ISWAManager::ref().downloadImage(_data->id, absPath(_data->path));
    if(future){
        _futureTexture = future;

        return true;
    }

    return false;
}

int TexturePlane::id(){
        static int id = 0;
        return id++;
}

}// namespace openspace