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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
48QT_BEGIN_NAMESPACE
49
50namespace Qt3DRender {
51namespace Render {
52
53RenderStateSet::RenderStateSet()
54 : m_stateMask(0)
55{
56}
57
58RenderStateSet::~RenderStateSet()
59{
60}
61
62template<>
63void RenderStateSet::addState<StateVariant>(const StateVariant &ds)
64{
65 m_states.push_back(t: ds);
66 m_stateMask |= ds.type;
67}
68
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(t&: 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
98StateMaskSet 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
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(type: otherState.type);
112 if (canAdd)
113 m_states.push_back(t: otherState);
114 }
115 m_stateMask |= other->stateMask();
116}
117
118bool RenderStateSet::canAddStateOfType(StateMask type) const
119{
120 return !hasStateOfType(type) || allowMultipleStatesOfType(type);
121}
122
123bool RenderStateSet::hasStateOfType(StateMask type) const
124{
125 return (type & stateMask());
126}
127
128bool RenderStateSet::allowMultipleStatesOfType(StateMask type) const
129{
130 return (type == BlendEquationArgumentsMask) ||
131 (type == ClipPlaneMask);
132}
133
134bool 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
150QT_END_NAMESPACE
151

source code of qt3d/src/render/renderstates/renderstateset.cpp