qt-everywhere-src-5.15.1/qtquick3d/src/quick3d/qquick3darealight.cpp

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#include "qquick3darealight_p.h"
#include "qquick3dobject_p.h"

#include <QtQuick3DRuntimeRender/private/qssgrenderlight_p.h>

QT_BEGIN_NAMESPACE

/*!
    \qmltype AreaLight
    \inherits Light
    \inqmlmodule QtQuick3D
    \brief Defines an area light in the scene.

    The area light is similar to the directional light, but instead of emitting equally bright
    light across the whole scene, the area light emits directional light from a rectangle shaped
    object. Aside from the size, an area light has the same characteristics and properties as
    the directional light.

    Rotating, scaling and moving actions will all effect an area light.

    \sa DirectionalLight, PointLight, SpotLight
*/

/*!
 * \qmlproperty real AreaLight::width
 *
 * This property controls the width of an Area lights rectangle.
 *
 */

/*!
 * \qmlproperty real AreaLight::height
 *
 * This property controls the height of an Area lights rectangle
 *
 */

float QQuick3DAreaLight::width() const
{
    return m_width;
}

float QQuick3DAreaLight::height() const
{
    return m_height;
}

void QQuick3DAreaLight::setWidth(float width)
{
    if (qFuzzyCompare(m_width, width))
        return;

    m_width = width;
    m_dirtyFlags.setFlag(DirtyFlag::AreaDirty);
    emit widthChanged();
    update();
}

void QQuick3DAreaLight::setHeight(float height)
{
    if (qFuzzyCompare(m_height, height))
        return;

    m_height = height;
    m_dirtyFlags.setFlag(DirtyFlag::AreaDirty);
    emit heightChanged();
    update();
}

QSSGRenderGraphObject *QQuick3DAreaLight::updateSpatialNode(QSSGRenderGraphObject *node)
{
    if (!node) {
        markAllDirty();
        node = new QSSGRenderLight();
        QSSGRenderLight *light = static_cast<QSSGRenderLight *>(node);
        light->m_lightType = QSSGRenderLight::Type::Area;
    }

    QQuick3DAbstractLight::updateSpatialNode(node);

    QSSGRenderLight *light = static_cast<QSSGRenderLight *>(node);

    if (m_dirtyFlags.testFlag(DirtyFlag::AreaDirty)) {
        m_dirtyFlags.setFlag(DirtyFlag::AreaDirty, false);
        light->m_areaWidth = m_width;
        light->m_areaHeight = m_height;
    }

    return node;
}

QT_END_NAMESPACE