1 /**************************************************************************** 2 ** 3 ** Copyright (C) 2014 Klaralvdalens Datakonsult AB (KDAB). 4 ** Copyright (C) 2016 The Qt Company Ltd and/or its subsidiary(-ies). 5 ** Contact: https://www.qt.io/licensing/ 6 ** 7 ** This file is part of the Qt3D module of the Qt Toolkit. 8 ** 9 ** $QT_BEGIN_LICENSE:LGPL$ 10 ** Commercial License Usage 11 ** Licensees holding valid commercial Qt licenses may use this file in 12 ** accordance with the commercial license agreement provided with the 13 ** Software or, alternatively, in accordance with the terms contained in 14 ** a written agreement between you and The Qt Company. For licensing terms 15 ** and conditions see https://www.qt.io/terms-conditions. For further 16 ** information use the contact form at https://www.qt.io/contact-us. 17 ** 18 ** GNU Lesser General Public License Usage 19 ** Alternatively, this file may be used under the terms of the GNU Lesser 20 ** General Public License version 3 as published by the Free Software 21 ** Foundation and appearing in the file LICENSE.LGPL3 included in the 22 ** packaging of this file. Please review the following information to 23 ** ensure the GNU Lesser General Public License version 3 requirements 24 ** will be met: https://www.gnu.org/licenses/lgpl-3.0.html. 25 ** 26 ** GNU General Public License Usage 27 ** Alternatively, this file may be used under the terms of the GNU 28 ** General Public License version 2.0 or (at your option) the GNU General 29 ** Public license version 3 or any later version approved by the KDE Free 30 ** Qt Foundation. The licenses are as published by the Free Software 31 ** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3 32 ** included in the packaging of this file. Please review the following 33 ** information to ensure the GNU General Public License requirements will 34 ** be met: https://www.gnu.org/licenses/gpl-2.0.html and 35 ** https://www.gnu.org/licenses/gpl-3.0.html. 36 ** 37 ** $QT_END_LICENSE$ 38 ** 39 ****************************************************************************/ 40 41 #include "renderstateset_p.h" 42 43 #include <bitset> 44 45 #include <Qt3DRender/private/renderstates_p.h> 46 #include <Qt3DRender/private/qrenderstate_p.h> 47 48 QT_BEGIN_NAMESPACE 49 50 namespace Qt3DRender { 51 namespace Render { 52 RenderStateSet()53RenderStateSet::RenderStateSet() 54 : m_stateMask(0) 55 { 56 } 57 ~RenderStateSet()58RenderStateSet::~RenderStateSet() 59 { 60 } 61 62 template<> addState(const StateVariant & ds)63void RenderStateSet::addState<StateVariant>(const StateVariant &ds) 64 { 65 m_states.push_back(ds); 66 m_stateMask |= ds.type; 67 } 68 changeCost(RenderStateSet * previousState)69int RenderStateSet::changeCost(RenderStateSet *previousState) 70 { 71 if (previousState == this) 72 return 0; 73 74 int cost = 0; 75 76 // first, find cost of any resets 77 StateMaskSet invOurState = ~stateMask(); 78 StateMaskSet stateToReset = previousState->stateMask() & invOurState; 79 80 std::bitset<64> bs(stateToReset); 81 cost += int(bs.count()); 82 83 // now, find out how many states we're changing 84 for (const StateVariant &ds : qAsConst(m_states)) { 85 // if the other state contains matching, then doesn't 86 // contribute to cost at all 87 if (previousState->contains(ds)) 88 continue; 89 90 // flat cost for now; could be replaced with a cost() method on 91 // RenderState 92 cost += 2; 93 } 94 95 return cost; 96 } 97 stateMask() const98StateMaskSet RenderStateSet::stateMask() const 99 { 100 return m_stateMask; 101 } 102 103 // This modifies our state to add states from others 104 // if we don't already contain a state with that type set merge(const RenderStateSet * other)105void RenderStateSet::merge(const RenderStateSet *other) 106 { 107 const QVector<StateVariant> otherStates = other->states(); 108 109 // We only add states which are new (different type) 110 for (const StateVariant &otherState : otherStates) { 111 const bool canAdd = canAddStateOfType(otherState.type); 112 if (canAdd) 113 m_states.push_back(otherState); 114 } 115 m_stateMask |= other->stateMask(); 116 } 117 canAddStateOfType(StateMask type) const118bool RenderStateSet::canAddStateOfType(StateMask type) const 119 { 120 return !hasStateOfType(type) || allowMultipleStatesOfType(type); 121 } 122 hasStateOfType(StateMask type) const123bool RenderStateSet::hasStateOfType(StateMask type) const 124 { 125 return (type & stateMask()); 126 } 127 allowMultipleStatesOfType(StateMask type) const128bool RenderStateSet::allowMultipleStatesOfType(StateMask type) const 129 { 130 return (type == BlendEquationArgumentsMask) || 131 (type == ClipPlaneMask); 132 } 133 contains(const StateVariant & ds) const134bool RenderStateSet::contains(const StateVariant &ds) const 135 { 136 // trivial reject using the state mask bits 137 if (!(ds.type & stateMask())) 138 return false; 139 140 for (const StateVariant &rs : m_states) { 141 if (rs == ds) 142 return true; 143 } 144 return false; 145 } 146 147 } // namespace Render 148 } // namespace Qt3DRender 149 150 QT_END_NAMESPACE 151