qshader.cpp

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// Copyright (C) 2023 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
#include "qshader_p.h"
#include <QDataStream>
#include <QBuffer>
 
QT_BEGIN_NAMESPACE
 
QShader::QShader()
    : d(nullptr)
{
}
 
void QShader::detach()
{
    if (d)
        qAtomicDetach(d);
    else
        d = new QShaderPrivate;
}
 
QShader::QShader(const QShader &other)
    : d(other.d)
{
    if (d)
        d->ref.ref();
}
 
QShader &QShader::operator=(const QShader &other)
{
    if (d) {
        if (other.d) {
            qAtomicAssign(d, other.d);
        } else {
            if (!d->ref.deref())
                delete d;
            d = nullptr;
        }
    } else if (other.d) {
        other.d->ref.ref();
        d = other.d;
    }
    return *this;
}
 
QShader::~QShader()
{
    if (d && !d->ref.deref())
        delete d;
}
 
bool QShader::isValid() const
{
    return d ? !d->shaders.isEmpty() : false;
}
 
QShader::Stage QShader::stage() const
{
    return d ? d->stage : QShader::VertexStage;
}
 
void QShader::setStage(Stage stage)
{
    if (!d || stage != d->stage) {
        detach();
        d->stage = stage;
    }
}
 
QShaderDescription QShader::description() const
{
    return d ? d->desc : QShaderDescription();
}
 
void QShader::setDescription(const QShaderDescription &desc)
{
    detach();
    d->desc = desc;
}
 
QList<QShaderKey> QShader::availableShaders() const
{
    return d ? d->shaders.keys().toVector() : QList<QShaderKey>();
}
 
QShaderCode QShader::shader(const QShaderKey &key) const
{
    return d ? d->shaders.value(key) : QShaderCode();
}
 
void QShader::setShader(const QShaderKey &key, const QShaderCode &shader)
{
    if (d && d->shaders.value(key) == shader)
        return;
 
    detach();
    d->shaders[key] = shader;
}
 
void QShader::removeShader(const QShaderKey &key)
{
    if (!d)
        return;
 
    auto it = d->shaders.find(key);
    if (it == d->shaders.end())
        return;
 
    detach();
    d->shaders.erase(it);
}
 
static void writeShaderKey(QDataStream *ds, const QShaderKey &k)
{
    *ds << int(k.source());
    *ds << k.sourceVersion().version();
    *ds << k.sourceVersion().flags();
    *ds << int(k.sourceVariant());
}
 
QByteArray QShader::serialized(SerializedFormatVersion version) const
{
    static QShaderPrivate sd;
    QShaderPrivate *dd = d ? d : &sd;
 
    QBuffer buf;
    QDataStream ds(&buf);
    ds.setVersion(QDataStream::Qt_5_10);
    if (!buf.open(QIODevice::WriteOnly))
        return QByteArray();
 
    const int qsbVersion = QShaderPrivate::qtQsbVersion(version);
    ds << qsbVersion;
 
    ds << int(dd->stage);
    dd->desc.serialize(&ds, qsbVersion);
    ds << int(dd->shaders.size());
    for (auto it = dd->shaders.cbegin(), itEnd = dd->shaders.cend(); it != itEnd; ++it) {
        const QShaderKey &k(it.key());
        writeShaderKey(&ds, k);
        const QShaderCode &shader(dd->shaders.value(k));
        ds << shader.shader();
        ds << shader.entryPoint();
    }
    ds << int(dd->bindings.size());
    for (auto it = dd->bindings.cbegin(), itEnd = dd->bindings.cend(); it != itEnd; ++it) {
        const QShaderKey &k(it.key());
        writeShaderKey(&ds, k);
        const NativeResourceBindingMap &map(it.value());
        ds << int(map.size());
        for (auto mapIt = map.cbegin(), mapItEnd = map.cend(); mapIt != mapItEnd; ++mapIt) {
            ds << mapIt.key();
            ds << mapIt.value().first;
            ds << mapIt.value().second;
        }
    }
    ds << int(dd->combinedImageMap.size());
    for (auto it = dd->combinedImageMap.cbegin(), itEnd = dd->combinedImageMap.cend(); it != itEnd; ++it) {
        const QShaderKey &k(it.key());
        writeShaderKey(&ds, k);
        const SeparateToCombinedImageSamplerMappingList &list(it.value());
        ds << int(list.size());
        for (auto listIt = list.cbegin(), listItEnd = list.cend(); listIt != listItEnd; ++listIt) {
            ds << listIt->combinedSamplerName;
            ds << listIt->textureBinding;
            ds << listIt->samplerBinding;
        }
    }
    if (qsbVersion > QShaderPrivate::QSB_VERSION_WITHOUT_NATIVE_SHADER_INFO) {
        ds << int(dd->nativeShaderInfoMap.size());
        for (auto it = dd->nativeShaderInfoMap.cbegin(), itEnd = dd->nativeShaderInfoMap.cend(); it != itEnd; ++it) {
            const QShaderKey &k(it.key());
            writeShaderKey(&ds, k);
            ds << it->flags;
            ds << int(it->extraBufferBindings.size());
            for (auto mapIt = it->extraBufferBindings.cbegin(), mapItEnd = it->extraBufferBindings.cend();
                 mapIt != mapItEnd; ++mapIt)
            {
                ds << mapIt.key();
                ds << mapIt.value();
            }
        }
    }
 
    return qCompress(buf.buffer());
}
 
static void readShaderKey(QDataStream *ds, QShaderKey *k)
{
    int intVal;
    *ds >> intVal;
    k->setSource(QShader::Source(intVal));
    QShaderVersion ver;
    *ds >> intVal;
    ver.setVersion(intVal);
    *ds >> intVal;
    ver.setFlags(QShaderVersion::Flags(intVal));
    k->setSourceVersion(ver);
    *ds >> intVal;
    k->setSourceVariant(QShader::Variant(intVal));
}
 
QShader QShader::fromSerialized(const QByteArray &data)
{
    QByteArray udata = qUncompress(data);
    QBuffer buf(&udata);
    QDataStream ds(&buf);
    ds.setVersion(QDataStream::Qt_5_10);
    if (!buf.open(QIODevice::ReadOnly))
        return QShader();
 
    QShader bs;
    bs.detach(); // to get d created
    QShaderPrivate *d = QShaderPrivate::get(&bs);
    Q_ASSERT(d->ref.loadRelaxed() == 1); // must be detached
    int intVal;
    ds >> intVal;
    d->qsbVersion = intVal;
    if (d->qsbVersion != QShaderPrivate::QSB_VERSION
            && d->qsbVersion != QShaderPrivate::QSB_VERSION_WITHOUT_INPUT_OUTPUT_INTERFACE_BLOCKS
            && d->qsbVersion != QShaderPrivate::QSB_VERSION_WITHOUT_EXTENDED_STORAGE_BUFFER_INFO
            && d->qsbVersion != QShaderPrivate::QSB_VERSION_WITHOUT_NATIVE_SHADER_INFO
            && d->qsbVersion != QShaderPrivate::QSB_VERSION_WITHOUT_SEPARATE_IMAGES_AND_SAMPLERS
            && d->qsbVersion != QShaderPrivate::QSB_VERSION_WITHOUT_VAR_ARRAYDIMS
            && d->qsbVersion != QShaderPrivate::QSB_VERSION_WITH_CBOR
            && d->qsbVersion != QShaderPrivate::QSB_VERSION_WITH_BINARY_JSON
            && d->qsbVersion != QShaderPrivate::QSB_VERSION_WITHOUT_BINDINGS)
    {
        qWarning("Attempted to deserialize QShader with unknown version %d.", d->qsbVersion);
        return QShader();
    }
 
    ds >> intVal;
    d->stage = Stage(intVal);
    if (d->qsbVersion > QShaderPrivate::QSB_VERSION_WITH_CBOR) {
        d->desc = QShaderDescription::deserialize(&ds, d->qsbVersion);
    } else if (d->qsbVersion > QShaderPrivate::QSB_VERSION_WITH_BINARY_JSON) {
        qWarning("Can no longer load QShaderDescription from CBOR.");
        d->desc = QShaderDescription();
    } else {
        qWarning("Can no longer load QShaderDescription from binary JSON.");
        d->desc = QShaderDescription();
    }
    int count;
    ds >> count;
    for (int i = 0; i < count; ++i) {
        QShaderKey k;
        readShaderKey(&ds, &k);
        QShaderCode shader;
        QByteArray s;
        ds >> s;
        shader.setShader(s);
        ds >> s;
        shader.setEntryPoint(s);
        d->shaders[k] = shader;
    }
 
    if (d->qsbVersion > QShaderPrivate::QSB_VERSION_WITHOUT_BINDINGS) {
        ds >> count;
        for (int i = 0; i < count; ++i) {
            QShaderKey k;
            readShaderKey(&ds, &k);
            NativeResourceBindingMap map;
            int mapSize;
            ds >> mapSize;
            for (int b = 0; b < mapSize; ++b) {
                int binding;
                ds >> binding;
                int firstNativeBinding;
                ds >> firstNativeBinding;
                int secondNativeBinding;
                ds >> secondNativeBinding;
                map.insert(binding, { firstNativeBinding, secondNativeBinding });
            }
            d->bindings.insert(k, map);
        }
    }
 
    if (d->qsbVersion > QShaderPrivate::QSB_VERSION_WITHOUT_SEPARATE_IMAGES_AND_SAMPLERS) {
        ds >> count;
        for (int i = 0; i < count; ++i) {
            QShaderKey k;
            readShaderKey(&ds, &k);
            SeparateToCombinedImageSamplerMappingList list;
            int listSize;
            ds >> listSize;
            for (int b = 0; b < listSize; ++b) {
                QByteArray combinedSamplerName;
                ds >> combinedSamplerName;
                int textureBinding;
                ds >> textureBinding;
                int samplerBinding;
                ds >> samplerBinding;
                list.append({ combinedSamplerName, textureBinding, samplerBinding });
            }
            d->combinedImageMap.insert(k, list);
        }
    }
 
    if (d->qsbVersion > QShaderPrivate::QSB_VERSION_WITHOUT_NATIVE_SHADER_INFO) {
        ds >> count;
        for (int i = 0; i < count; ++i) {
            QShaderKey k;
            readShaderKey(&ds, &k);
            int flags;
            ds >> flags;
            QMap<int, int> extraBufferBindings;
            int mapSize;
            ds >> mapSize;
            for (int b = 0; b < mapSize; ++b) {
                int k, v;
                ds >> k;
                ds >> v;
                extraBufferBindings.insert(k, v);
            }
            d->nativeShaderInfoMap.insert(k, { flags, extraBufferBindings });
        }
    }
 
    return bs;
}
 
QShaderVersion::QShaderVersion(int v, Flags f)
    : m_version(v), m_flags(f)
{
}
 
QShaderCode::QShaderCode(const QByteArray &code, const QByteArray &entry)
    : m_shader(code), m_entryPoint(entry)
{
}
 
QShaderKey::QShaderKey(QShader::Source s,
                       const QShaderVersion &sver,
                       QShader::Variant svar)
    : m_source(s),
      m_sourceVersion(sver),
      m_sourceVariant(svar)
{
}
 
bool operator==(const QShader &lhs, const QShader &rhs) noexcept
{
    if (!lhs.d || !rhs.d)
        return lhs.d == rhs.d;
 
    return lhs.d->stage == rhs.d->stage
            && lhs.d->shaders == rhs.d->shaders
            && lhs.d->bindings == rhs.d->bindings;
}
 
size_t qHash(const QShader &s, size_t seed) noexcept
{
    if (s.d) {
        QtPrivate::QHashCombine hash;
        seed = hash(seed, s.stage());
        if (!s.d->shaders.isEmpty()) {
            seed = hash(seed, s.d->shaders.firstKey());
            seed = hash(seed, s.d->shaders.first());
        }
    }
    return seed;
}
 
bool operator==(const QShaderVersion &lhs, const QShaderVersion &rhs) noexcept
{
    return lhs.version() == rhs.version() && lhs.flags() == rhs.flags();
}
 
#ifdef Q_OS_INTEGRITY
size_t qHash(const QShaderVersion &s, size_t seed) noexcept
{
    return qHashMulti(seed, s.version(), s.flags());
}
#endif
 
bool operator<(const QShaderVersion &lhs, const QShaderVersion &rhs) noexcept
{
    if (lhs.version() < rhs.version())
        return true;
 
    if (lhs.version() == rhs.version())
        return int(lhs.flags()) < int(rhs.flags());
 
    return false;
}
 
bool operator==(const QShaderKey &lhs, const QShaderKey &rhs) noexcept
{
    return lhs.source() == rhs.source() && lhs.sourceVersion() == rhs.sourceVersion()
            && lhs.sourceVariant() == rhs.sourceVariant();
}
 
bool operator<(const QShaderKey &lhs, const QShaderKey &rhs) noexcept
{
    if (int(lhs.source()) < int(rhs.source()))
        return true;
 
    if (int(lhs.source()) == int(rhs.source())) {
        if (lhs.sourceVersion() < rhs.sourceVersion())
            return true;
        if (lhs.sourceVersion() == rhs.sourceVersion()) {
            if (int(lhs.sourceVariant()) < int(rhs.sourceVariant()))
                return true;
        }
    }
 
    return false;
}
 
size_t qHash(const QShaderKey &k, size_t seed) noexcept
{
    return qHashMulti(seed,
                      k.source(),
                      k.sourceVersion().version(),
                      k.sourceVersion().flags(),
                      k.sourceVariant());
}
 
bool operator==(const QShaderCode &lhs, const QShaderCode &rhs) noexcept
{
    return lhs.shader() == rhs.shader() && lhs.entryPoint() == rhs.entryPoint();
}
 
size_t qHash(const QShaderCode &k, size_t seed) noexcept
{
    return qHash(k.shader(), seed);
}
 
#ifndef QT_NO_DEBUG_STREAM
QDebug operator<<(QDebug dbg, const QShader &bs)
{
    const QShaderPrivate *d = bs.d;
    QDebugStateSaver saver(dbg);
 
    if (d) {
        dbg.nospace() << "QShader("
                      << "stage=" << d->stage
                      << " shaders=" << d->shaders.keys()
                      << " desc.isValid=" << d->desc.isValid()
                      << ')';
    } else {
        dbg.nospace() << "QShader()";
    }
 
    return dbg;
}
 
QDebug operator<<(QDebug dbg, const QShaderKey &k)
{
    QDebugStateSaver saver(dbg);
    dbg.nospace() << "ShaderKey(" << k.source()
                  << " " << k.sourceVersion()
                  << " " << k.sourceVariant() << ")";
    return dbg;
}
 
QDebug operator<<(QDebug dbg, const QShaderVersion &v)
{
    QDebugStateSaver saver(dbg);
    dbg.nospace() << "Version(" << v.version() << " " << v.flags() << ")";
    return dbg;
}
#endif // QT_NO_DEBUG_STREAM
 
QShader::NativeResourceBindingMap QShader::nativeResourceBindingMap(const QShaderKey &key) const
{
    if (!d)
        return {};
 
    auto it = d->bindings.constFind(key);
    if (it == d->bindings.cend())
        return {};
 
    return it.value();
}
 
void QShader::setResourceBindingMap(const QShaderKey &key, const NativeResourceBindingMap &map)
{
    detach();
    d->bindings[key] = map;
}
 
void QShader::removeResourceBindingMap(const QShaderKey &key)
{
    if (!d)
        return;
 
    auto it = d->bindings.find(key);
    if (it == d->bindings.end())
        return;
 
    detach();
    d->bindings.erase(it);
}
 
QShader::SeparateToCombinedImageSamplerMappingList QShader::separateToCombinedImageSamplerMappingList(const QShaderKey &key) const
{
    if (!d)
        return {};
 
    auto it = d->combinedImageMap.constFind(key);
    if (it == d->combinedImageMap.cend())
        return {};
 
    return it.value();
}
 
void QShader::setSeparateToCombinedImageSamplerMappingList(const QShaderKey &key,
                                                           const SeparateToCombinedImageSamplerMappingList &list)
{
    detach();
    d->combinedImageMap[key] = list;
}
 
void QShader::removeSeparateToCombinedImageSamplerMappingList(const QShaderKey &key)
{
    if (!d)
        return;
 
    auto it = d->combinedImageMap.find(key);
    if (it == d->combinedImageMap.end())
        return;
 
    detach();
    d->combinedImageMap.erase(it);
}
 
QShader::NativeShaderInfo QShader::nativeShaderInfo(const QShaderKey &key) const
{
    if (!d)
        return {};
 
    auto it = d->nativeShaderInfoMap.constFind(key);
    if (it == d->nativeShaderInfoMap.cend())
        return {};
 
    return it.value();
}
 
void QShader::setNativeShaderInfo(const QShaderKey &key, const NativeShaderInfo &info)
{
    detach();
    d->nativeShaderInfoMap[key] = info;
}
 
void QShader::removeNativeShaderInfo(const QShaderKey &key)
{
    if (!d)
        return;
 
    auto it = d->nativeShaderInfoMap.find(key);
    if (it == d->nativeShaderInfoMap.end())
        return;
 
    detach();
    d->nativeShaderInfoMap.erase(it);
}
 
QT_END_NAMESPACE