1 files changed, 150 insertions, 0 deletions
diff --git a/src/render/renderstates/renderstateset.cpp b/src/render/renderstates/renderstateset.cpp
new file mode 100644
index 000000000..6b66d2dd7
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+++ b/src/render/renderstates/renderstateset.cpp
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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 <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 canAdd = canAddStateOfType(otherState.type);
+        if (canAdd)
+            m_states.push_back(otherState);
+    }
+}
+
+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