OpenSpace/modules/globebrowsing/globes/renderableglobe.cpp

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 * OpenSpace                                                                             *
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 * Copyright (c) 2014-2017                                                               *
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#include <modules/globebrowsing/globes/renderableglobe.h>
 
#include <modules/debugging/rendering/debugrenderer.h>
#include <modules/globebrowsing/globes/chunkedlodglobe.h>
#include <modules/globebrowsing/rendering/layer/layermanager.h>

namespace {
    const char* keyFrame = "Frame";
    const char* keyRadii = "Radii";
    const char* keyInteractionDepthBelowEllipsoid = "InteractionDepthBelowEllipsoid";
    const char* keyCameraMinHeight = "CameraMinHeight";
    const char* keySegmentsPerPatch = "SegmentsPerPatch";
    const char* keyLayers = "Layers";
}

namespace openspace {

using namespace properties;

namespace globebrowsing {
    
RenderableGlobe::RenderableGlobe(const ghoul::Dictionary& dictionary)
    : _debugProperties({
        BoolProperty("saveOrThrowCamera", "save or throw camera", false),
        BoolProperty("showChunkEdges", "show chunk edges", false),
        BoolProperty("showChunkBounds", "show chunk bounds", false),
        BoolProperty("showChunkAABB", "show chunk AABB", false),
        BoolProperty("showHeightResolution", "show height resolution", false),
        BoolProperty("showHeightIntensities", "show height intensities", false),
        BoolProperty("performFrustumCulling", "perform frustum culling", true),
        BoolProperty("performHorizonCulling", "perform horizon culling", true),
        BoolProperty("levelByProjectedAreaElseDistance", "level by projected area (else distance)", true),
        BoolProperty("resetTileProviders", "reset tile providers", false),
        BoolProperty("toggleEnabledEveryFrame", "toggle enabled every frame", false),
        BoolProperty("collectStats", "collect stats", false),
        BoolProperty("limitLevelByAvailableData", "Limit level by available data", true),
        IntProperty("modelSpaceRenderingCutoffLevel", "Model Space Rendering Cutoff Level", 10, 1, 22)
    })
    , _generalProperties({
        BoolProperty("enabled", "Enabled", true),
        BoolProperty("performShading", "perform shading", true),
        BoolProperty("atmosphere", "atmosphere", false),
        FloatProperty("lodScaleFactor", "lodScaleFactor",10.0f, 1.0f, 50.0f),
        FloatProperty("cameraMinHeight", "cameraMinHeight", 100.0f, 0.0f, 1000.0f)
    })
    , _debugPropertyOwner("Debug")
    , _texturePropertyOwner("Textures")
{
    setName("RenderableGlobe");
        
    dictionary.getValue(keyFrame, _frame);

    // Read the radii in to its own dictionary
    glm::dvec3 radii;
    dictionary.getValue(keyRadii, radii);
    _ellipsoid = Ellipsoid(radii);
    setBoundingSphere(_ellipsoid.averageRadius());

    // Ghoul can't read ints from lua dictionaries...
    double patchSegmentsd;
    dictionary.getValue(keySegmentsPerPatch, patchSegmentsd);
    int patchSegments = patchSegmentsd;
        
    if (!dictionary.getValue(keyInteractionDepthBelowEllipsoid,
        _interactionDepthBelowEllipsoid)) {
        _interactionDepthBelowEllipsoid = 0;
    }

    float cameraMinHeight;
    dictionary.getValue(keyCameraMinHeight, cameraMinHeight);
    _generalProperties.cameraMinHeight.set(cameraMinHeight);

    // Init layer manager
    ghoul::Dictionary layersDictionary;
    if (!dictionary.getValue(keyLayers, layersDictionary)) {
        throw ghoul::RuntimeError(
            std::string(keyLayers) + " must be specified specified!");
    }

    _layerManager = std::make_shared<LayerManager>(layersDictionary);

    _chunkedLodGlobe = std::make_shared<ChunkedLodGlobe>(
        *this, patchSegments, _layerManager);
        
    // This distance will be enough to render the globe as one pixel if the field of
    // view is 'fov' radians and the screen resolution is 'res' pixels.
    double fov = 2 * glm::pi<double>() / 6; // 60 degrees
    int res = 2880;
    double distance = res * _ellipsoid.maximumRadius() / tan(fov / 2);
    _distanceSwitch.addSwitchValue(_chunkedLodGlobe, distance);
        
    addProperty(_generalProperties.isEnabled);
    addProperty(_generalProperties.atmosphereEnabled);
    addProperty(_generalProperties.performShading);
    addProperty(_generalProperties.lodScaleFactor);
    addProperty(_generalProperties.cameraMinHeight);
        
    _debugPropertyOwner.addProperty(_debugProperties.saveOrThrowCamera);
    _debugPropertyOwner.addProperty(_debugProperties.showChunkEdges);
    _debugPropertyOwner.addProperty(_debugProperties.showChunkBounds);
    _debugPropertyOwner.addProperty(_debugProperties.showChunkAABB);
    _debugPropertyOwner.addProperty(_debugProperties.showHeightResolution);
    _debugPropertyOwner.addProperty(_debugProperties.showHeightIntensities);
    _debugPropertyOwner.addProperty(_debugProperties.performFrustumCulling);
    _debugPropertyOwner.addProperty(_debugProperties.performHorizonCulling);
    _debugPropertyOwner.addProperty(
        _debugProperties.levelByProjectedAreaElseDistance
    );
    _debugPropertyOwner.addProperty(_debugProperties.resetTileProviders);
    _debugPropertyOwner.addProperty(_debugProperties.toggleEnabledEveryFrame);
    _debugPropertyOwner.addProperty(_debugProperties.collectStats);
    _debugPropertyOwner.addProperty(_debugProperties.limitLevelByAvailableData);
    _debugPropertyOwner.addProperty(_debugProperties.modelSpaceRenderingCutoffLevel);
  
    auto notifyShaderRecompilation = [&](){
        _chunkedLodGlobe->notifyShaderRecompilation();
    };
    _generalProperties.atmosphereEnabled.onChange(notifyShaderRecompilation);
    _generalProperties.performShading.onChange(notifyShaderRecompilation);
    _debugProperties.showChunkEdges.onChange(notifyShaderRecompilation);
    _debugProperties.showHeightResolution.onChange(notifyShaderRecompilation);
    _debugProperties.showHeightIntensities.onChange(notifyShaderRecompilation);

    _layerManager->onChange(notifyShaderRecompilation);

    addPropertySubOwner(_debugPropertyOwner);
    addPropertySubOwner(_layerManager.get());
}

bool RenderableGlobe::initialize() {
    return _distanceSwitch.initialize();
}

bool RenderableGlobe::deinitialize() {
    return _distanceSwitch.deinitialize();
}

bool RenderableGlobe::isReady() const {
    return true;
}

void RenderableGlobe::render(const RenderData& data) {
    bool statsEnabled = _debugProperties.collectStats.value();
    _chunkedLodGlobe->stats.setEnabled(statsEnabled);

    if (_debugProperties.toggleEnabledEveryFrame.value()) {
        _generalProperties.isEnabled.setValue(
            !_generalProperties.isEnabled.value()
        );
    }
    if (_generalProperties.isEnabled.value()) {
        if (_debugProperties.saveOrThrowCamera.value()) {
            _debugProperties.saveOrThrowCamera.setValue(false);

            if (savedCamera() == nullptr) { // save camera
                setSaveCamera(std::make_shared<Camera>(data.camera));
            }
            else { // throw camera
                setSaveCamera(nullptr);
            }
        }
        _distanceSwitch.render(data);
    }
    if (_savedCamera != nullptr) {
        DebugRenderer::ref().renderCameraFrustum(data, *_savedCamera);
    }
}

void RenderableGlobe::update(const UpdateData& data) {
    _time = data.time.j2000Seconds();
    _distanceSwitch.update(data);

    glm::dmat4 translation =
        glm::translate(glm::dmat4(1.0), data.modelTransform.translation);
    glm::dmat4 rotation = glm::dmat4(data.modelTransform.rotation);
    glm::dmat4 scaling =
        glm::scale(glm::dmat4(1.0), glm::dvec3(data.modelTransform.scale,
            data.modelTransform.scale, data.modelTransform.scale));

    _cachedModelTransform = translation * rotation * scaling;
    _cachedInverseModelTransform = glm::inverse(_cachedModelTransform);

    if (_debugProperties.resetTileProviders) {
        _layerManager->reset();
        _debugProperties.resetTileProviders = false;
    }
    _layerManager->update();
    _chunkedLodGlobe->update(data);
}

glm::dvec3 RenderableGlobe::projectOnEllipsoid(glm::dvec3 position) {
    return _ellipsoid.geodeticSurfaceProjection(position);
}

float RenderableGlobe::getHeight(glm::dvec3 position) {
    if (_chunkedLodGlobe) {
        return _chunkedLodGlobe->getHeight(position);
    }
    else {
        return 0;
    }
}

std::shared_ptr<ChunkedLodGlobe> RenderableGlobe::chunkedLodGlobe() const{
    return _chunkedLodGlobe;
}

const Ellipsoid& RenderableGlobe::ellipsoid() const{
    return _ellipsoid;
}

const glm::dmat4& RenderableGlobe::modelTransform() const{
    return _cachedModelTransform;
}

const glm::dmat4& RenderableGlobe::inverseModelTransform() const{
    return _cachedInverseModelTransform;
}

const RenderableGlobe::DebugProperties&
    RenderableGlobe::debugProperties() const{
    return _debugProperties;
}
    
const RenderableGlobe::GeneralProperties&
    RenderableGlobe::generalProperties() const{
    return _generalProperties;
}

const std::shared_ptr<const Camera> RenderableGlobe::savedCamera() const {
    return _savedCamera;
}

double RenderableGlobe::interactionDepthBelowEllipsoid() {
    return _interactionDepthBelowEllipsoid;
}

void RenderableGlobe::setSaveCamera(std::shared_ptr<Camera> camera) { 
    _savedCamera = camera;
}

} // namespace globebrowsing
} // namespace openspace