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/****************************************************************************
**
** Copyright (C) 2014 Klaralvdalens Datakonsult AB (KDAB).
** Copyright (C) 2016 The Qt Company Ltd and/or its subsidiary(-ies).
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt3D module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** 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 https://www.qt.io/terms-conditions. For further
** information use the contact form at https://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.LGPL3 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-3.0.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 (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "renderstateset_p.h"
#include <bitset>
#include <QDebug>
#include <QOpenGLContext>
#include <Qt3DRender/private/renderstates_p.h>
#include <Qt3DRender/private/qrenderstate_p.h>
QT_BEGIN_NAMESPACE
namespace Qt3DRender {
namespace Render {
RenderStateSet::RenderStateSet()
: m_stateMask(0)
{
}
RenderStateSet::~RenderStateSet()
{
}
template<>
void RenderStateSet::addState<StateVariant>(const StateVariant &ds)
{
m_states.push_back(ds);
m_stateMask |= ds.type;
}
int RenderStateSet::changeCost(RenderStateSet *previousState)
{
if (previousState == this)
return 0;
int cost = 0;
// first, find cost of any resets
StateMaskSet invOurState = ~stateMask();
StateMaskSet stateToReset = previousState->stateMask() & invOurState;
std::bitset<64> bs(stateToReset);
cost += int(bs.count());
// now, find out how many states we're changing
for (const StateVariant &ds : qAsConst(m_states)) {
// if the other state contains matching, then doesn't
// contribute to cost at all
if (previousState->contains(ds))
continue;
// flat cost for now; could be replaced with a cost() method on
// RenderState
cost += 2;
}
return cost;
}
StateMaskSet RenderStateSet::stateMask() const
{
return m_stateMask;
}
// This modifies our state to add states from others
// if we don't already contain a state with that type set
void RenderStateSet::merge(RenderStateSet *other)
{
m_stateMask |= other->stateMask();
const QVector<StateVariant> otherStates = other->states();
// We only add states which are new (different type)
for (const StateVariant &otherState : otherStates) {
const bool hasFoundStateOfSameType = hasStateOfType(otherState.type);
if (!hasFoundStateOfSameType)
m_states.push_back(otherState);
}
}
bool RenderStateSet::hasStateOfType(StateMask type) const
{
return (type & stateMask());
}
bool RenderStateSet::contains(const StateVariant &ds) const
{
// trivial reject using the state mask bits
if (!(ds.type & stateMask()))
return false;
for (const StateVariant &rs : m_states) {
if (rs == ds)
return true;
}
return false;
}
} // namespace Render
} // namespace Qt3DRender
QT_END_NAMESPACE
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