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#include "qquickfreenectdepthdataproxy.h"

#include "libfreenect.h"

QQuickFreenectDepthDataProxy::QQuickFreenectDepthDataProxy()
    : m_backend(QQuickFreenectBackend::instance())
{
    connect(m_backend.get(), SIGNAL(depthFrameReady()), SLOT(updateData()));
    connect(this, SIGNAL(highClipChanged()), SLOT(updateData()));

    m_dataArray = new QtDataVisualization::QSurfaceDataArray;
    m_dataArray->reserve(height);
    for (int y = 0; y < height; ++y)
        m_dataArray->append(new QtDataVisualization::QSurfaceDataRow(width));
    resetArray(m_dataArray);
    m_backend->requestDepthStreamEnabled();
}

void QQuickFreenectDepthDataProxy::updateData()
{
    unsigned frameId = m_backend->depthFrameId();
    if (m_lastUpdateFrameId == frameId)
        return;

    uint16_t *buffer = m_backend->depthBuffer();
    QSize bufferSize = m_backend->depthBufferSize();
    int widthRatio = bufferSize.width() / width;
    int heightRatio = bufferSize.height() / height;
    for (int y = 0; y < height; ++y) {
        auto proxyRow = (*m_dataArray)[y];
        for (int x = 0; x < width; ++x) {
            uint16_t data = buffer[(height - 1 - y)*widthRatio * bufferSize.width() + x*heightRatio];
            data = std::min(m_highClip, data != FREENECT_DEPTH_RAW_NO_VALUE ? FREENECT_DEPTH_RAW_MAX_VALUE - data : 0);
            (*proxyRow)[x].setPosition(QVector3D(x, data, y));
        }
    }
    resetArray(m_dataArray);
    m_lastUpdateFrameId = frameId;
}