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#include "adaptationlayer.h"

/*!
    Constructs a new texture reference with status set to Null
 */
TextureReference::TextureReference()
    : m_status(Null)
    , m_texture_id(0)
    , m_sub_rect(0, 0, 1, 1)
    , m_has_alpha(false)
    , m_owns_texture(false)
    , m_mipmap(false)
{
}

TextureReference::~TextureReference()
{
    if (m_owns_texture) {
        glDeleteTextures(1, (GLuint *) &m_texture_id);
    }
}

void TextureReference::setStatus(Status s)
{
    m_status = s;

    Q_ASSERT(s != Uploaded || (m_texture_id > 0 && !m_texture_size.isEmpty()));

    emit statusChanged(s);
}

/*!
    Performs a synchronous upload of \a image using the specified \a hints.

    The upload is done using the QGLContext::bindTexture().
 */
const TextureReference *TextureManager::requestUploadedTexture(const QImage &image, UploadHints hints, QObject *listener, const char *slot)
{
    QGLContext *context = const_cast<QGLContext *>(QGLContext::currentContext());

    QGLContext::BindOptions options = QGLContext::PremultipliedAlphaBindOption;
    if (hints & GenerateMipmapUploadHint)
        options |= QGLContext::MipmapBindOption;

    int id = context->bindTexture(image,
                                  GL_TEXTURE_2D,
                                  image.hasAlphaChannel() ? GL_RGBA : GL_RGB,
                                  options);

    TextureReference *ref = new TextureReference();

    if (listener && slot)
        QObject::connect(ref, SIGNAL(statusChanged(int)), listener, slot);

    ref->setTextureId(id);
    ref->setOwnsTexture(true);
    ref->setAlphaChannel(image.hasAlphaChannel());
    ref->setTextureSize(image.size());
    ref->setStatus(TextureReference::Uploaded);

    return ref;
}