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#include "qdirectionallight.h"
#include "qdirectionallight_p.h"
#include <Qt3DCore/qscenepropertychange.h>

QT_BEGIN_NAMESPACE

namespace Qt3DRender {

/*
 *
 * Expected Shader struct
 *
 * \code
 *
 * struct DirectionalLight
 * {
 *  vec3 position;
 *  vec3 direction;
 *  vec4 color;
 *  float intensity;
 * };
 *
 * uniform DirectionalLight directionalLights[10];
 *
 * \endcode
 */

/*!
    \class Qt3DRender::QDirectionalLightPrivate
    \internal
*/
QDirectionalLightPrivate::QDirectionalLightPrivate()
    : QLightPrivate(QLight::DirectionalLight)
    , m_direction(0.0f, -1.0f, 0.0f)
{
}

void QDirectionalLight::copy(const QNode *ref)
{
    const QDirectionalLight *light = static_cast<const QDirectionalLight*>(ref);
    d_func()->m_direction = light->d_func()->m_direction;
    // This needs to be last otherwise, properties value won't be copied
    // as we use shader introspection in QShaderData::copy
    QLight::copy(ref);
}

QDirectionalLight::QDirectionalLight(QNode *parent)
    : QLight(*new QDirectionalLightPrivate, parent)
{
}

/*! \internal */
QDirectionalLight::QDirectionalLight(QDirectionalLightPrivate &dd, QNode *parent)
    : QLight(dd, parent)
{
}

void QDirectionalLight::setDirection(const QVector3D &direction)
{
    Q_D(QDirectionalLight);
    if (direction != d->m_direction) {
        d->m_direction = direction;
        emit directionChanged(direction);
    }
}

QVector3D QDirectionalLight::direction() const
{
    Q_D(const QDirectionalLight);
    return d->m_direction;
}

} // namespace Qt3DRender

QT_END_NAMESPACE