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-/****************************************************************************
-**
-** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
-** All rights reserved.
-** Contact: Nokia Corporation ([email protected])
-**
-** This file is part of the QtQuick3D module of the Qt Toolkit.
-**
-** $QT_BEGIN_LICENSE:LGPL$
-** GNU Lesser General Public License Usage
-** This file may be used under the terms of the GNU Lesser General Public
-** License version 2.1 as published by the Free Software Foundation and
-** appearing in the file LICENSE.LGPL included in the packaging of this
-** file. Please review the following information to ensure the GNU Lesser
-** General Public License version 2.1 requirements will be met:
-** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
-**
-** In addition, as a special exception, Nokia gives you certain additional
-** rights. These rights are described in the Nokia Qt LGPL Exception
-** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
-**
-** GNU General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU General
-** Public License version 3.0 as published by the Free Software Foundation
-** and appearing in the file LICENSE.GPL included in the packaging of this
-** file. Please review the following information to ensure the GNU General
-** Public License version 3.0 requirements will be met:
-** http://www.gnu.org/copyleft/gpl.html.
-**
-** Other Usage
-** Alternatively, this file may be used in accordance with the terms and
-** conditions contained in a signed written agreement between you and Nokia.
-**
-**
-**
-**
-**
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-
-#include "qgltwosidedmaterial.h"
-#include "qglpainter.h"
-#include "qgllightmodel.h"
-
-QT_BEGIN_NAMESPACE
-
-/*!
- \class QGLTwoSidedMaterial
- \since 4.8
- \brief The QGLTwoSidedMaterial class implemented two-sided materials for 3D rendering.
- \ingroup qt3d
- \ingroup qt3d::materials
-
- Two-sided materials consist of a front() material and a back()
- material. The specific material rendered is determined by the
- direction faced by a fragment when it is rendered. Fragments
- that point towards the viewer are rendered with front(),
- and fragments that point away from the viewer are rendered
- with back(). In both cases, any textures that are used to
- render the material are taken from front().
-
- If front() and back() are the same, then the same material
- will be used on both sides of the fragment. However, this
- is not exactly the same as using a one-sided QGLMaterial in
- place of the two-sided material. One-sided materials will
- render the back of the fragment as black because the normal
- is always pointing away from the viewer. Two-sided materials
- reverse the back-facing normal so that back() is lit as
- though it was on a front-facing face.
-
- \sa QGLMaterial
-*/
-
-class QGLTwoSidedMaterialPrivate
-{
-public:
- QGLTwoSidedMaterialPrivate() : front(0), back(0), defaultMaterial(0) {}
-
- QGLMaterial *front;
- QGLMaterial *back;
- QGLMaterial *defaultMaterial;
-};
-
-/*!
- Constructs a two-sided material object and attaches it to \a parent.
-
- \sa setFront(), setBack()
-*/
-QGLTwoSidedMaterial::QGLTwoSidedMaterial(QObject *parent)
- : QGLAbstractMaterial(parent)
- , d_ptr(new QGLTwoSidedMaterialPrivate)
-{
-}
-
-/*!
- Destroys this two-sided material object.
-*/
-QGLTwoSidedMaterial::~QGLTwoSidedMaterial()
-{
-}
-
-/*!
- \property QGLTwoSidedMaterial::front
- \brief the material for the front side of the object's fragments.
-
- The default value is null, which will result in a default QGLMaterial
- object being used when bind() is called.
-
- \sa back(), frontChanged(), materialChanged()
-*/
-
-QGLMaterial *QGLTwoSidedMaterial::front() const
-{
- Q_D(const QGLTwoSidedMaterial);
- return d->front;
-}
-
-void QGLTwoSidedMaterial::setFront(QGLMaterial *material)
-{
- Q_D(QGLTwoSidedMaterial);
- if (d->front != material) {
- if (d->front && d->front != d->back) {
- disconnect(d->front, SIGNAL(materialChanged()),
- this, SIGNAL(materialChanged()));
- }
- d->front = material;
- if (d->front && d->front != d->back) {
- connect(d->front, SIGNAL(materialChanged()),
- this, SIGNAL(materialChanged()));
- }
- emit frontChanged();
- emit materialChanged();
- }
-}
-
-/*!
- \property QGLTwoSidedMaterial::back
- \brief the material for the back side of the object's fragments.
-
- The default value is null, which indicates that front() should
- be used on both the front and back sides of the object's fragments.
-
- Textures are taken from the front() material. Any textures that
- appear in the back() material are ignored. Only the material
- lighting parameters from back() will be used.
-
- \sa front(), backChanged(), materialChanged()
-*/
-
-QGLMaterial *QGLTwoSidedMaterial::back() const
-{
- Q_D(const QGLTwoSidedMaterial);
- return d->back;
-}
-
-void QGLTwoSidedMaterial::setBack(QGLMaterial *material)
-{
- Q_D(QGLTwoSidedMaterial);
- if (d->back != material) {
- if (d->back && d->back != d->front) {
- disconnect(d->back, SIGNAL(materialChanged()),
- this, SIGNAL(materialChanged()));
- }
- d->back = material;
- if (d->back && d->back != d->front) {
- connect(d->back, SIGNAL(materialChanged()),
- this, SIGNAL(materialChanged()));
- }
- emit backChanged();
- emit materialChanged();
- }
-}
-
-/*!
- \reimp
-*/
-bool QGLTwoSidedMaterial::isTransparent() const
-{
- Q_D(const QGLTwoSidedMaterial);
- if (d->front && d->front->isTransparent())
- return true;
- return d->back && d->back->isTransparent();
-}
-
-/*!
- \reimp
-*/
-void QGLTwoSidedMaterial::bind(QGLPainter *painter)
-{
- Q_D(QGLTwoSidedMaterial);
- QGLMaterial *front = d->front;
- if (!front) {
- // We need to have something for the front material.
- front = d->defaultMaterial;
- if (!front) {
- d->defaultMaterial = new QGLMaterial(this);
- front = d->defaultMaterial;
- }
- }
- const_cast<QGLLightModel *>(painter->lightModel())
- ->setModel(QGLLightModel::TwoSided); // FIXME
- if (d->back && d->back != front) {
- painter->setFaceMaterial(QGL::FrontFaces, front);
- painter->setFaceMaterial(QGL::BackFaces, d->back);
- } else {
- painter->setFaceMaterial(QGL::AllFaces, front);
- }
- front->bindTextures(painter);
-}
-
-/*!
- \reimp
-*/
-void QGLTwoSidedMaterial::release(QGLPainter *painter, QGLAbstractMaterial *next)
-{
- Q_D(const QGLTwoSidedMaterial);
- if (d->front)
- d->front->release(painter, next);
- else if (d->defaultMaterial)
- d->defaultMaterial->release(painter, next);
-}
-
-/*!
- \reimp
-*/
-void QGLTwoSidedMaterial::prepareToDraw
- (QGLPainter *painter, const QGLAttributeSet &attributes)
-{
- Q_D(QGLTwoSidedMaterial);
- QGLMaterial *front = d->front;
- if (!front)
- front = d->defaultMaterial;
- front->bindEffect(painter, attributes, true);
-}
-
-/*!
- \fn void QGLTwoSidedMaterial::frontChanged()
-
- Signal that is emitted when the front() material pointer changes.
-
- This signal is not emitted when a property on front() changes.
- Use materialChanged() for that purpose instead.
-
- \sa front(), backChanged()
-*/
-
-/*!
- \fn void QGLTwoSidedMaterial::backChanged()
-
- Signal that is emitted when the back() material pointer changes.
-
- This signal is not emitted when a property on back() changes.
- Use materialChanged() for that purpose instead.
-
- \sa back(), frontChanged()
-*/
-
-QT_END_NAMESPACE
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