Revision control
++ // Copyright (C) 2014 Klaralvdalens Datakonsult AB (KDAB).
++ // Copyright (C) 2016 The Qt Company Ltd and/or its subsidiary(-ies).
++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
++
++ #include "renderstateset_p.h"
++
++ #include <bitset>
++
++ #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 : std::as_const(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(const RenderStateSet *other)
++ {
++ const std::vector<StateVariant> &otherStates = other->states();
++
++ // We only add states which are new (different type)
++ for (const StateVariant &otherState : otherStates) {
++ const bool canAdd = canAddStateOfType(otherState.type);
++ if (canAdd)
++ m_states.push_back(otherState);
++ }
++ m_stateMask |= other->stateMask();
++ }
++
++ bool RenderStateSet::canAddStateOfType(StateMask type) const
++ {
++ return !hasStateOfType(type) || allowMultipleStatesOfType(type);
++ }
++
++ bool RenderStateSet::hasStateOfType(StateMask type) const
++ {
++ return (type & stateMask());
++ }
++
++ bool RenderStateSet::allowMultipleStatesOfType(StateMask type) const
++ {
++ return (type == BlendEquationArgumentsMask) ||
++ (type == ClipPlaneMask);
++ }
++
++ 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