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// Copyright (C) 2020 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
//
// 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.
//
#ifndef QQSBCOLLECTION_H
#define QQSBCOLLECTION_H
#include <QtQuick3DUtils/private/qtquick3dutilsglobal_p.h>
#include <QtCore/qfile.h>
#include <QtCore/qset.h>
#include <QtCore/qmap.h>
#include <rhi/qshader.h>
QT_BEGIN_NAMESPACE
class QRhiShaderStage;
class Q_QUICK3DUTILS_EXPORT QQsbCollection
{
public:
virtual ~QQsbCollection();
struct Q_QUICK3DUTILS_EXPORT Entry
{
// 'value' is optional. hashing and comparison are based solely on 'key'.
Entry() = default;
explicit Entry(const QByteArray &key) : key(key)
{
hashKey = qHash(key);
}
Entry(const QByteArray &key, qint64 value) : key(key), value(value)
{
hashKey = qHash(key);
}
bool isValid() const { return !key.isEmpty(); }
QByteArray key;
qint64 value = -1;
size_t hashKey;
};
using FeatureSet = QMap<QByteArray, bool>; // QMap so it is ordered by key
template<typename T>
static FeatureSet toFeatureSet(const T &ssgFeatureSet)
{
FeatureSet ret;
for (quint32 i = 0, end = T::Count; i != end; ++i) {
auto def = T::fromIndex(i);
if (ssgFeatureSet.isSet(def))
ret.insert(T::asDefineString(def), true);
}
return ret;
}
struct Q_QUICK3DUTILS_EXPORT EntryDesc {
QByteArray materialKey;
FeatureSet featureSet;
QShader vertShader;
QShader fragShader;
QByteArray generateSha() const;
static QByteArray generateSha(const QByteArray &materialKey, const FeatureSet &featureSet);
};
using EntryMap = QSet<Entry>;
virtual EntryMap availableEntries() const = 0;
virtual Entry addEntry(const QByteArray &key, const EntryDesc &entryDesc) = 0;
virtual bool extractEntry(Entry entry, EntryDesc &entryDesc) = 0;
protected:
enum Version : quint8
{
Unknown,
One = 0x10,
Two = 0x20
};
bool readEndHeader(QDataStream &ds, qint64 *startPos, quint8 *version);
void writeEndHeader(QDataStream &ds, qint64 startPos, quint8 version, quint64 magic);
bool readEndHeader(QIODevice *device, EntryMap *entries, quint8 *version);
void writeEndHeader(QIODevice *device, const EntryMap &entries);
};
Q_DECLARE_TYPEINFO(QQsbCollection::Entry, Q_PRIMITIVE_TYPE);
Q_QUICK3DUTILS_EXPORT QDataStream &operator<<(QDataStream &stream, const QQsbCollection::Entry &entry);
Q_QUICK3DUTILS_EXPORT QDataStream &operator>>(QDataStream &stream, QQsbCollection::Entry &entry);
Q_QUICK3DUTILS_EXPORT QDataStream &operator<<(QDataStream &stream, const QQsbCollection::EntryDesc &entryDesc);
Q_QUICK3DUTILS_EXPORT QDataStream &operator>>(QDataStream &stream, QQsbCollection::EntryDesc &entryDesc);
Q_QUICK3DUTILS_EXPORT size_t qHash(const QQsbCollection::Entry &entry, size_t);
Q_QUICK3DUTILS_EXPORT bool operator==(const QQsbCollection::Entry &l, const QQsbCollection::Entry &r);
// Simple implementation backed by a hash table. Save and load are explicit and
// all data is read and written. The file format is compatible with other
// implementations.
class Q_QUICK3DUTILS_EXPORT QQsbInMemoryCollection : public QQsbCollection
{
public:
QQsbInMemoryCollection() = default;
EntryMap availableEntries() const override;
Entry addEntry(const QByteArray &key, const EntryDesc &entryDesc) override;
bool extractEntry(Entry entry, EntryDesc &entryDesc) override;
void clear();
bool load(const QString &filename);
bool save(const QString &filename);
private:
Q_DISABLE_COPY(QQsbInMemoryCollection);
QHash<Entry, EntryDesc> entries;
};
// Serial, direct-to/from-QIODevice implementation.
class Q_QUICK3DUTILS_EXPORT QQsbIODeviceCollection : public QQsbCollection
{
public:
enum MapMode
{
Read = QIODevice::ReadOnly,
Write = (QIODevice::WriteOnly | QIODevice::Truncate)
};
explicit QQsbIODeviceCollection(const QString &filePath);
explicit QQsbIODeviceCollection(QIODevice &dev);
~QQsbIODeviceCollection();
bool map(MapMode mode);
void unmap();
EntryMap availableEntries() const override;
Entry addEntry(const QByteArray &key, const EntryDesc &entryDesc) override;
bool extractEntry(Entry entry, EntryDesc &entryDesc) override;
void dumpInfo();
static void dumpInfo(const QString &device);
static void dumpInfo(QIODevice &device);
private:
Q_DISABLE_COPY(QQsbIODeviceCollection);
enum class DeviceOwner : quint8
{
Self,
Extern
};
QFile file;
QIODevice &device;
DeviceOwner devOwner = DeviceOwner::Self;
quint8 version = Version::Unknown;
EntryMap entries;
};
QT_END_NAMESPACE
#endif // QQSBCOLLECTION_H
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