| 1 | // Copyright (C) 2014 Klaralvdalens Datakonsult AB (KDAB). |
|---|---|
| 2 | // Copyright (C) 2016 The Qt Company Ltd and/or its subsidiary(-ies). |
| 3 | // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only |
| 4 | |
| 5 | #include "renderstateset_p.h" |
| 6 | |
| 7 | #include <bitset> |
| 8 | |
| 9 | #include <Qt3DRender/private/renderstates_p.h> |
| 10 | #include <Qt3DRender/private/qrenderstate_p.h> |
| 11 | |
| 12 | QT_BEGIN_NAMESPACE |
| 13 | |
| 14 | namespace Qt3DRender { |
| 15 | namespace Render { |
| 16 | |
| 17 | RenderStateSet::RenderStateSet() |
| 18 | : m_stateMask(0) |
| 19 | { |
| 20 | } |
| 21 | |
| 22 | RenderStateSet::~RenderStateSet() |
| 23 | { |
| 24 | } |
| 25 | |
| 26 | template<> |
| 27 | void RenderStateSet::addState<StateVariant>(const StateVariant &ds) |
| 28 | { |
| 29 | m_states.push_back(x: ds); |
| 30 | m_stateMask |= ds.type; |
| 31 | } |
| 32 | |
| 33 | int RenderStateSet::changeCost(RenderStateSet *previousState) |
| 34 | { |
| 35 | if (previousState == this) |
| 36 | return 0; |
| 37 | |
| 38 | int cost = 0; |
| 39 | |
| 40 | // first, find cost of any resets |
| 41 | StateMaskSet invOurState = ~stateMask(); |
| 42 | StateMaskSet stateToReset = previousState->stateMask() & invOurState; |
| 43 | |
| 44 | std::bitset<64> bs(stateToReset); |
| 45 | cost += int(bs.count()); |
| 46 | |
| 47 | // now, find out how many states we're changing |
| 48 | for (const StateVariant &ds : std::as_const(t&: m_states)) { |
| 49 | // if the other state contains matching, then doesn't |
| 50 | // contribute to cost at all |
| 51 | if (previousState->contains(ds)) |
| 52 | continue; |
| 53 | |
| 54 | // flat cost for now; could be replaced with a cost() method on |
| 55 | // RenderState |
| 56 | cost += 2; |
| 57 | } |
| 58 | |
| 59 | return cost; |
| 60 | } |
| 61 | |
| 62 | StateMaskSet RenderStateSet::stateMask() const |
| 63 | { |
| 64 | return m_stateMask; |
| 65 | } |
| 66 | |
| 67 | // This modifies our state to add states from others |
| 68 | // if we don't already contain a state with that type set |
| 69 | void RenderStateSet::merge(const RenderStateSet *other) |
| 70 | { |
| 71 | const std::vector<StateVariant> &otherStates = other->states(); |
| 72 | |
| 73 | // We only add states which are new (different type) |
| 74 | for (const StateVariant &otherState : otherStates) { |
| 75 | const bool canAdd = canAddStateOfType(type: otherState.type); |
| 76 | if (canAdd) |
| 77 | m_states.push_back(x: otherState); |
| 78 | } |
| 79 | m_stateMask |= other->stateMask(); |
| 80 | } |
| 81 | |
| 82 | bool RenderStateSet::canAddStateOfType(StateMask type) const |
| 83 | { |
| 84 | return !hasStateOfType(type) || allowMultipleStatesOfType(type); |
| 85 | } |
| 86 | |
| 87 | bool RenderStateSet::hasStateOfType(StateMask type) const |
| 88 | { |
| 89 | return (type & stateMask()); |
| 90 | } |
| 91 | |
| 92 | bool RenderStateSet::allowMultipleStatesOfType(StateMask type) const |
| 93 | { |
| 94 | return (type == BlendEquationArgumentsMask) || |
| 95 | (type == ClipPlaneMask); |
| 96 | } |
| 97 | |
| 98 | bool RenderStateSet::contains(const StateVariant &ds) const |
| 99 | { |
| 100 | // trivial reject using the state mask bits |
| 101 | if (!(ds.type & stateMask())) |
| 102 | return false; |
| 103 | |
| 104 | for (const StateVariant &rs : m_states) { |
| 105 | if (rs == ds) |
| 106 | return true; |
| 107 | } |
| 108 | return false; |
| 109 | } |
| 110 | |
| 111 | } // namespace Render |
| 112 | } // namespace Qt3DRender |
| 113 | |
| 114 | QT_END_NAMESPACE |
| 115 |