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#include "qwaylandtexturebufferattacher_p.h"

#include <QQuickWindow>
#include <QSGTexture>

#include <QtCompositor/qwaylandquicksurface.h>
#include <QtCompositor/qwaylandoutput.h>

QWaylandTextureBufferAttacher::QWaylandTextureBufferAttacher(QWaylandQuickSurface *surface)
    : m_surface(surface)
    , m_texture(0)
    , m_update(false)
{
}

QWaylandTextureBufferAttacher::~QWaylandTextureBufferAttacher()
{
    if (m_texture)
        m_texture->deleteLater();
    m_buffer = QWaylandBufferRef();
    m_nextBuffer = QWaylandBufferRef();
}

void QWaylandTextureBufferAttacher::attach(const QWaylandBufferRef &ref)
{
    m_nextBuffer = ref;
    m_update = true;
}

void QWaylandTextureBufferAttacher::updateTexture()
{
    m_buffer = m_nextBuffer;
    delete m_texture;
    m_texture = 0;

    QQuickWindow *window = static_cast<QQuickWindow *>(m_surface->mainOutput()->window());
    if (m_nextBuffer) {
        if (m_buffer.isShm()) {
            m_texture = window->createTextureFromImage(m_buffer.image());
        } else {
            QQuickWindow::CreateTextureOptions opt = 0;
            if (m_surface->useTextureAlpha()) {
                opt |= QQuickWindow::TextureHasAlphaChannel;
            }
            m_texture = window->createTextureFromId(m_buffer.createTexture(), m_surface->size(), opt);
        }
        m_texture->bind();
    }

    m_update = false;
}

void QWaylandTextureBufferAttacher::unmap()
{
    m_nextBuffer = QWaylandBufferRef();
    m_update = true;
}

void QWaylandTextureBufferAttacher::invalidateTexture()
{
    if (m_buffer)
        m_buffer.destroyTexture();
    delete m_texture;
    m_texture = 0;
    m_update = true;
    m_buffer = QWaylandBufferRef();
}