OpenSpace/modules/base/rendering/screenspaceimagelocal.cpp

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 * OpenSpace                                                                             *
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#include <modules/base/rendering/screenspaceimagelocal.h>

#include <openspace/documentation/documentation.h>
#include <openspace/documentation/verifier.h>
#include <ghoul/filesystem/filesystem.h>
#include <ghoul/io/texture/texturereader.h>
#include <ghoul/logging/logmanager.h>
#include <ghoul/opengl/programobject.h>
#include <ghoul/opengl/texture.h>
#include <ghoul/opengl/textureconversion.h>
#include <filesystem>
#include <optional>

namespace {
    constexpr openspace::properties::Property::PropertyInfo TexturePathInfo = {
        "TexturePath",
        "Texture path",
        "Sets the path of the texture that is displayed on this screen space plane. If "
        "this value is changed, the image at the new path will automatically be loaded "
        "and displayed. The size of the image will also automatically set the default "
        "size of this plane",
        // @VISIBILITY(2.4)
        openspace::properties::Property::Visibility::User
    };

    struct [[codegen::Dictionary(ScreenSpaceImageLocal)]] Parameters {
        // Specifies the GUI name of the ScreenspaceImage
        std::optional<std::string> name;

        // [[codegen::verbatim(TexturePathInfo.description)]]
        std::optional<std::string> texturePath;
    };
#include "screenspaceimagelocal_codegen.cpp"
} // namespace

namespace openspace {

documentation::Documentation ScreenSpaceImageLocal::Documentation() {
    return codegen::doc<Parameters>("base_screenspace_image_local");
}

ScreenSpaceImageLocal::ScreenSpaceImageLocal(const ghoul::Dictionary& dictionary)
    : ScreenSpaceRenderable(dictionary)
    , _texturePath(TexturePathInfo)
{
    const Parameters p = codegen::bake<Parameters>(dictionary);

    // @TODO (abock, 2021-02-02) Should this be the name variable? The identifier wasn't
    // declared in the documentation
    std::string identifier;
    if (dictionary.hasValue<std::string>(KeyIdentifier)) {
        identifier = dictionary.value<std::string>(KeyIdentifier);
    }
    else {
        identifier = "ScreenSpaceImageLocal";
    }
    identifier = makeUniqueIdentifier(identifier);
    setIdentifier(identifier);

    _texturePath.onChange([this]() {
        if (!std::filesystem::is_regular_file(absPath(_texturePath))) {
            LWARNINGC(
                "ScreenSpaceImageLocal",
                std::format(
                    "Image '{}' did not exist for '{}'", _texturePath.value(), _identifier
                )
            );
        }
        else {
            _textureIsDirty = true;
        }
    });
    addProperty(_texturePath);

    if (p.texturePath.has_value()) {
        if (std::filesystem::is_regular_file(absPath(*p.texturePath))) {
            _texturePath = absPath(*p.texturePath).string();
        }
        else {
            LWARNINGC(
                "ScreenSpaceImageLocal",
                std::format(
                    "Image '{}' did not exist for '{}'", *p.texturePath, _identifier
                )
            );
        }
    }
}

bool ScreenSpaceImageLocal::deinitializeGL() {
    _texture = nullptr;

    return ScreenSpaceRenderable::deinitializeGL();
}

void ScreenSpaceImageLocal::update() {
    if (_textureIsDirty && !_texturePath.value().empty()) {
        std::unique_ptr<ghoul::opengl::Texture> texture =
            ghoul::io::TextureReader::ref().loadTexture(
                absPath(_texturePath).string(),
                2
            );

        if (texture) {
            // Images don't need to start on 4-byte boundaries, for example if the
            // image is only RGB
            glPixelStorei(GL_UNPACK_ALIGNMENT, 1);

            if (texture->format() == ghoul::opengl::Texture::Format::Red) {
                texture->setSwizzleMask({ GL_RED, GL_RED, GL_RED, GL_ONE });
            }

            texture->uploadTexture();
            texture->setFilter(ghoul::opengl::Texture::FilterMode::LinearMipMap);
            texture->purgeFromRAM();

            _texture = std::move(texture);
            _objectSize = _texture->dimensions();
            _textureIsDirty = false;
        }
    }
}

void ScreenSpaceImageLocal::bindTexture() {
    if (_texture) {
        _texture->bind();
    }
}

} // namespace openspace