OpenSpace/modules/globebrowsing/tile/tileprovider/singleimageprovider.cpp

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 * OpenSpace                                                                             *
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 * Copyright (c) 2014-2017                                                               *
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#include <modules/globebrowsing/tile/tileprovider/singleimageprovider.h>

#include <ghoul/io/texture/texturereader.h>
#include <ghoul/misc/dictionary.h>
#include <ghoul/opengl/texture.h>

namespace {
    const char* KeyFilePath = "FilePath";
}

namespace openspace {
namespace globebrowsing {
namespace tileprovider {
    
SingleImageProvider::SingleImageProvider(const ghoul::Dictionary& dictionary)
    : _tile(nullptr, nullptr, Tile::Status::Unavailable)
{
    // Required input
    if (!dictionary.getValue<std::string>(KeyFilePath, _imagePath)) {
        throw std::runtime_error(std::string("Must define key '") + KeyFilePath + "'");
    }

    reset();
}

SingleImageProvider::SingleImageProvider(const std::string& imagePath)
    : _imagePath(imagePath)
    , _tile(nullptr, nullptr, Tile::Status::Unavailable)
{
    reset();
}

Tile SingleImageProvider::getTile(const TileIndex& tileIndex) {
    return _tile;
}

Tile::Status SingleImageProvider::getTileStatus(const TileIndex& index) {
    return _tile.status();
}

TileDepthTransform SingleImageProvider::depthTransform() {
    TileDepthTransform transform;
    transform.depthOffset = 0.0f;
    transform.depthScale = 1.0f;
    return transform;
}

void SingleImageProvider::update() {
    // nothing to be done
}

void SingleImageProvider::reset() {
    _tileTexture = ghoul::io::TextureReader::ref().loadTexture(_imagePath);
    Tile::Status tileStatus = _tileTexture ? Tile::Status::OK : Tile::Status::IOError;

    if (!_tileTexture) {
        throw std::runtime_error(std::string("Unable to load texture '")
            + _imagePath + "'");
    }
 
    _tileTexture->uploadTexture();
    _tileTexture->setFilter(ghoul::opengl::Texture::FilterMode::AnisotropicMipMap);

    _tile = Tile(_tileTexture.get(), nullptr, tileStatus);
}

int SingleImageProvider::maxLevel() {
    return 1337; // unlimited
}

} // namespace tileprovider
} // namespace globebrowsing
} // namespace openspace