// Copyright (C) 2008-2012 NVIDIA Corporation.
// Copyright (C) 2019 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only

#ifndef QSSGSHADERMAPKEY_P_H
#define QSSGSHADERMAPKEY_P_H

//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists purely as an
// implementation detail.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//

#include <QtQuick3DRuntimeRender/private/qtquick3druntimerenderglobal_p.h>
#include <QtQuick3DRuntimeRender/private/qssgrendershaderkeys_p.h>
#include <QtQuick3DRuntimeRender/private/qssgrendershadercache_p.h>

struct QSSGShaderMapKey
{
    QByteArray m_name;
    const QSSGShaderFeatures *m_featuresOrig;
    QSSGShaderFeatures m_featuresCopy;
    QSSGShaderDefaultMaterialKey *m_materialKeyOrig;
    QSSGShaderDefaultMaterialKey m_materialKeyCopy;
    size_t m_hashCode;

    void detach()
    {
        if (m_featuresOrig) {
            m_featuresCopy = *m_featuresOrig;
            m_featuresOrig = nullptr;
        }
        if (m_materialKeyOrig) {
            m_materialKeyCopy = *m_materialKeyOrig;
            m_materialKeyOrig = nullptr;
        }
    }

    QSSGShaderMapKey(const QByteArray &inName,
                     const QSSGShaderFeatures &inFeatures,
                     QSSGShaderDefaultMaterialKey &inMaterialKey)
        : m_name(inName), m_featuresOrig(&inFeatures), m_materialKeyOrig(&inMaterialKey)
    {
        m_hashCode = qHash(m_name) ^ qHash(m_featuresOrig) ^ qHash(m_materialKeyOrig->hash());
    }
};

inline bool operator==(const QSSGShaderMapKey &a, const QSSGShaderMapKey &b) Q_DECL_NOTHROW
{
    if (a.m_name != b.m_name)
        return false;

    const QSSGShaderDefaultMaterialKey *keyA = a.m_materialKeyOrig ? a.m_materialKeyOrig : &a.m_materialKeyCopy;
    const QSSGShaderDefaultMaterialKey *keyB = b.m_materialKeyOrig ? b.m_materialKeyOrig : &b.m_materialKeyCopy;
    if (!(*keyA == *keyB))
        return false;

    const QSSGShaderFeatures *featuresA = a.m_featuresOrig ? a.m_featuresOrig : &a.m_featuresCopy;
    const QSSGShaderFeatures *featuresB = b.m_featuresOrig ? b.m_featuresOrig : &b.m_featuresCopy;
    return *featuresA == *featuresB;
}

inline size_t qHash(const QSSGShaderMapKey &key, size_t seed)
{
    return key.m_hashCode ^ seed;
}

#endif
