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/****************************************************************************
**
** Copyright (C) 2014 Klaralvdalens Datakonsult AB (KDAB).
** Copyright (C) 2015 The Qt Company Ltd and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the Qt3D module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL3$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPLv3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or later 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 2.0 requirements will be
** met: http://www.gnu.org/licenses/gpl-2.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QT3D_RENDER_RENDERSTATE_H
#define QT3D_RENDER_RENDERSTATE_H
#include <QList>
#include <QSet>
QT_BEGIN_NAMESPACE
namespace Qt3D {
class QRenderState;
namespace Render {
class QGraphicsContext;
enum StateMask
{
BlendStateMask = 1 << 0,
StencilWriteStateMask = 1 << 1,
StencilTestStateMask = 1 << 2,
ScissorStateMask = 1 << 3,
DepthTestStateMask = 1 << 4,
DepthWriteStateMask = 1 << 5,
CullFaceStateMask = 1 << 6,
AlphaTestMask = 1 << 7,
FrontFaceStateMask = 1 << 8,
DitheringStateMask = 1 << 9,
AlphaCoverageStateMask = 1 << 10,
PolygonOffsetStateMask = 1 << 11,
ColorStateMask = 1 << 12
};
typedef quint64 StateMaskSet;
class Q_AUTOTEST_EXPORT RenderState
{
public:
virtual ~RenderState() {}
virtual void apply(QGraphicsContext* gc) const = 0;
virtual StateMaskSet mask() const = 0;
static RenderState *getOrCreateBackendState(QRenderState *renderState);
protected:
};
class RenderStateSet
{
public:
RenderStateSet();
void addState(RenderState* ds);
/**
* @brief changeCost - metric of cost to change to this state-set from
* a candidate previous state-set. This is used to find an optimal
* ordering of state-sets when sending draw commands.
* @param previousState
* @return
*/
int changeCost(RenderStateSet* previousState);
void apply(QGraphicsContext* gc);
StateMaskSet stateMask() const;
void resetMasked(StateMaskSet maskOfStatesToReset, QGraphicsContext* gc);
private:
/**
* @brief contains - check if this set contains a matching piece of state
* @param ds
* @return
*/
bool contains(RenderState* ds) const;
QSet<RenderState*> m_states;
StateMaskSet m_stateMask;
RenderStateSet* m_cachedPrevious;
QList<RenderState*> m_cachedDeltaStates;
};
} // Render
} // namespace Qt3D
QT_END_NAMESPACE
#endif // QT3D_RENDER_RENDERSTATE_H
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