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/*!
 * \class QBlendEquation
 * \brief The QBlendEquation class specifies the equation used for both the RGB
 *  blend equation and the Alpha blend equation
 * \since 5.7
 * \ingroup renderstates
 *
 * The blend equation is used to determine how a new pixel is combined with a pixel
 * already in the framebuffer.
 */

#include "qblendequation.h"
#include "qblendequation_p.h"
#include <Qt3DRender/private/qrenderstatecreatedchange_p.h>

QT_BEGIN_NAMESPACE

namespace Qt3DRender {

/*!
 * The constructor creates a new blend state object with the specified \a parent.
 */
QBlendEquation::QBlendEquation(QNode *parent)
    : QRenderState(*new QBlendEquationPrivate, parent)
{
}

/*! \internal */
QBlendEquation::~QBlendEquation()
{
}

QBlendEquation::BlendFunction QBlendEquation::blendFunction() const
{
    Q_D(const QBlendEquation);
    return d->m_blendFunction;
}

/*!
 * Sets the function used to decide how the source and destination colors are combined,
 * to \a blendFunction.
 * \param blendFunction
 */
void QBlendEquation::setBlendFunction(QBlendEquation::BlendFunction blendFunction)
{
    Q_D(QBlendEquation);
    if (d->m_blendFunction != blendFunction) {
        d->m_blendFunction = blendFunction;
        emit blendFunctionChanged(blendFunction);
    }
}

Qt3DCore::QNodeCreatedChangeBasePtr QBlendEquation::createNodeCreationChange() const
{
    auto creationChange = QRenderStateCreatedChangePtr<QBlendEquationData>::create(this);
    auto &data = creationChange->data;
    data.blendFunction = d_func()->m_blendFunction;
    return creationChange;
}

} // namespace Qt3DRender

QT_END_NAMESPACE
