qquick3dparticlemodelblendparticle.cpp

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// Copyright (C) 2021 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
 
#include "qquick3dparticlemodelblendparticle_p.h"
#include "qquick3dparticleemitter_p.h"
#include "qquick3dparticlerandomizer_p.h"
 
#include <QtCore/qdir.h>
#include <QtQml/qqmlfile.h>
 
#include <QtQuick3D/private/qquick3dobject_p.h>
#include <QtQuick3D/private/qquick3dgeometry_p.h>
 
#include <QtQuick3DUtils/private/qssgutils_p.h>
#include <QtQuick3DRuntimeRender/private/qssgrenderparticles_p.h>
#include <QtQuick3DRuntimeRender/private/qssgrendergeometry_p.h>
#include <QtQuick3DRuntimeRender/private/qssgrendermodel_p.h>
#include <QtQuick3DUtils/private/qssgmesh_p.h>
 
QT_BEGIN_NAMESPACE
 
QQuick3DParticleModelBlendParticle::QQuick3DParticleModelBlendParticle(QQuick3DNode *parent)
    : QQuick3DParticle(*new QQuick3DObjectPrivate(QQuick3DObjectPrivate::Type::ModelBlendParticle), parent)
{
    setFadeInEffect(QQuick3DParticle::FadeNone);
    setFadeOutEffect(QQuick3DParticle::FadeNone);
    QQuick3DParticle::doSetMaxAmount(0);
}
 
QQuick3DParticleModelBlendParticle::~QQuick3DParticleModelBlendParticle()
{
    delete m_model;
    delete m_modelGeometry;
}
 
QQmlComponent *QQuick3DParticleModelBlendParticle::delegate() const
{
    return m_delegate;
}
 
void QQuick3DParticleModelBlendParticle::setDelegate(QQmlComponent *delegate)
{
    if (delegate == m_delegate)
        return;
    m_delegate = delegate;
 
    reset();
    regenerate();
    Q_EMIT delegateChanged();
}
 
QQuick3DNode *QQuick3DParticleModelBlendParticle::endNode() const
{
    return m_endNode;
}
 
QQuick3DParticleModelBlendParticle::ModelBlendMode QQuick3DParticleModelBlendParticle::modelBlendMode() const
{
    return m_modelBlendMode;
}
 
int QQuick3DParticleModelBlendParticle::endTime() const
{
    return m_endTime;
}
 
QQuick3DNode *QQuick3DParticleModelBlendParticle::activationNode() const
{
    return m_activationNode;
}
 
QQuick3DParticleModelBlendParticle::ModelBlendEmitMode QQuick3DParticleModelBlendParticle::emitMode() const
{
    return m_emitMode;
}
 
void QQuick3DParticleModelBlendParticle::setEndNode(QQuick3DNode *node)
{
    if (m_endNode == node)
        return;
    if (m_endNode)
        QObject::disconnect(this);
 
    m_endNode = node;
 
    if (m_endNode) {
        QObject::connect(m_endNode, &QQuick3DNode::positionChanged, this, &QQuick3DParticleModelBlendParticle::handleEndNodeChanged);
        QObject::connect(m_endNode, &QQuick3DNode::rotationChanged, this, &QQuick3DParticleModelBlendParticle::handleEndNodeChanged);
        QObject::connect(m_endNode, &QQuick3DNode::scaleChanged, this, &QQuick3DParticleModelBlendParticle::handleEndNodeChanged);
    }
    handleEndNodeChanged();
    Q_EMIT endNodeChanged();
}
 
void QQuick3DParticleModelBlendParticle::setModelBlendMode(ModelBlendMode mode)
{
    if (m_modelBlendMode == mode)
        return;
    m_modelBlendMode = mode;
    reset();
    Q_EMIT modelBlendModeChanged();
}
 
void QQuick3DParticleModelBlendParticle::setEndTime(int endTime)
{
    if (endTime == m_endTime)
        return;
    m_endTime = endTime;
    Q_EMIT endTimeChanged();
}
 
void QQuick3DParticleModelBlendParticle::setActivationNode(QQuick3DNode *activationNode)
{
    if (m_activationNode == activationNode)
        return;
 
    m_activationNode = activationNode;
    Q_EMIT activationNodeChanged();
}
 
void QQuick3DParticleModelBlendParticle::setEmitMode(ModelBlendEmitMode emitMode)
{
    if (m_emitMode == emitMode)
        return;
 
    m_emitMode = emitMode;
    Q_EMIT emitModeChanged();
}
 
void QQuick3DParticleModelBlendParticle::regenerate()
{
    delete m_model;
    m_model = nullptr;
 
    if (!isComponentComplete())
        return;
 
    if (!m_delegate)
        return;
 
    if (QQuick3DParticleSystem::isGloballyDisabled())
        return;
 
    auto *obj = m_delegate->create(m_delegate->creationContext());
 
    m_model = qobject_cast<QQuick3DModel *>(obj);
    if (m_model) {
        updateParticles();
        auto *psystem = QQuick3DParticle::system();
        m_model->setParent(psystem);
        m_model->setParentItem(psystem);
    } else {
        delete obj;
    }
    handleEndNodeChanged();
}
 
static QSSGMesh::Mesh loadModelBlendParticleMesh(const QString &source)
{
    QString src = source;
    if (source.startsWith(QLatin1Char('#'))) {
        src = QSSGBufferManager::primitivePath(source);
        src.prepend(QLatin1String(":/"));
    }
    src = QDir::cleanPath(src);
    if (src.startsWith(QLatin1String("qrc:/")))
        src = src.mid(3);
 
    QFile file(src);
    if (!file.open(QFile::ReadOnly))
        return {};
    return QSSGMesh::Mesh::loadMesh(&file);
}
 
static QVector3D getPosition(const quint8 *srcVertices, quint32 idx, quint32 vertexStride, quint32 posOffset)
{
    const quint8 *vertex = srcVertices + idx * vertexStride;
    return *reinterpret_cast<const QVector3D *>(vertex + posOffset);
}
 
static float calcTriangleRadius(const QVector3D &center, const QVector3D &p0, const QVector3D &p1, const QVector3D &p2)
{
    return qMax(center.distanceToPoint(p1), qMax(center.distanceToPoint(p2), center.distanceToPoint(p0)));
}
 
static void copyToUnindexedVertices(QByteArray &unindexedVertexData,
                                    QVector<QVector3D> &centerData,
                                    float &maxTriangleRadius,
                                    const QByteArray &vertexBufferData,
                                    quint32 vertexStride,
                                    quint32 posOffset,
                                    const QByteArray &indexBufferData,
                                    bool u16Indices,
                                    quint32 primitiveCount)
{
    const quint8 *srcVertices = reinterpret_cast<const quint8 *>(vertexBufferData.data());
    quint8 *dst = reinterpret_cast<quint8 *>(unindexedVertexData.data());
    const quint16 *indexData16 = reinterpret_cast<const quint16 *>(indexBufferData.begin());
    const quint32 *indexData32 = reinterpret_cast<const quint32 *>(indexBufferData.begin());
    const float c_div3 = 1.0f / 3.0f;
    for (quint32 i = 0; i < primitiveCount; i++) {
        quint32 i0, i1, i2;
        if (u16Indices) {
            i0 = indexData16[3 * i];
            i1 = indexData16[3 * i + 1];
            i2 = indexData16[3 * i + 2];
        } else {
            i0 = indexData32[3 * i];
            i1 = indexData32[3 * i + 1];
            i2 = indexData32[3 * i + 2];
        }
        QVector3D p0 = getPosition(srcVertices, i0, vertexStride, posOffset);
        QVector3D p1 = getPosition(srcVertices, i1, vertexStride, posOffset);
        QVector3D p2 = getPosition(srcVertices, i2, vertexStride, posOffset);
        QVector3D center = (p0 + p1 + p2) * c_div3;
        centerData[i] = center;
        maxTriangleRadius = qMax(maxTriangleRadius, calcTriangleRadius(center, p0, p1, p2));
        memcpy(dst, srcVertices + i0 * vertexStride, vertexStride);
        dst += vertexStride;
        memcpy(dst, srcVertices + i1 * vertexStride, vertexStride);
        dst += vertexStride;
        memcpy(dst, srcVertices + i2 * vertexStride, vertexStride);
        dst += vertexStride;
    }
}
 
static void getVertexCenterData(QVector<QVector3D> &centerData,
                                float &maxTriangleRadius,
                                const QByteArray &vertexBufferData,
                                quint32 vertexStride,
                                quint32 posOffset,
                                quint32 primitiveCount)
{
    const quint8 *srcVertices = reinterpret_cast<const quint8 *>(vertexBufferData.data());
    const float c_div3 = 1.0f / 3.0f;
    for (quint32 i = 0; i < primitiveCount; i++) {
        QVector3D p0 = getPosition(srcVertices, 3 * i, vertexStride, posOffset);
        QVector3D p1 = getPosition(srcVertices, 3 * i + 1, vertexStride, posOffset);
        QVector3D p2 = getPosition(srcVertices, 3 * i + 2, vertexStride, posOffset);
        QVector3D center = (p0 + p1 + p2) * c_div3;
        centerData[i] = center;
        maxTriangleRadius = qMax(maxTriangleRadius, calcTriangleRadius(center, p0, p1, p2));
    }
}
 
void QQuick3DParticleModelBlendParticle::updateParticles()
{
    m_maxTriangleRadius = 0.f;
 
    // The primitives needs to be triangle list without indexing, because each triangle
    // needs to be it's own primitive and we need vertex index to get the particle index,
    // which we don't get with indexed primitives
    if (m_model->geometry()) {
        QQuick3DGeometry *geometry = m_model->geometry();
        if (geometry->primitiveType() != QQuick3DGeometry::PrimitiveType::Triangles) {
            qWarning () << "ModelBlendParticle3D: Invalid geometry primitive type, must be Triangles. ";
            return;
        }
        auto vertexBuffer = geometry->vertexData();
        auto indexBuffer = geometry->indexData();
 
        if (!vertexBuffer.size()) {
            qWarning () << "ModelBlendParticle3D: Invalid geometry, vertexData is empty. ";
            return;
        }
 
        const auto attributeBySemantic = [&](const QQuick3DGeometry *geometry, QQuick3DGeometry::Attribute::Semantic semantic) {
            for (int i = 0; i < geometry->attributeCount(); i++) {
                const auto attr = geometry->attribute(i);
                if (attr.semantic == semantic)
                    return attr;
            }
            Q_ASSERT(0);
            return QQuick3DGeometry::Attribute();
        };
 
        if (indexBuffer.size()) {
            m_modelGeometry = new QQuick3DGeometry;
 
            m_modelGeometry->setBounds(geometry->boundsMin(), geometry->boundsMax());
            m_modelGeometry->setPrimitiveType(QQuick3DGeometry::PrimitiveType::Triangles);
            m_modelGeometry->setStride(geometry->stride());
 
            for (int i = 0; i < geometry->attributeCount(); i++) {
                auto attr = geometry->attribute(i);
                if (attr.semantic != QQuick3DGeometry::Attribute::IndexSemantic)
                    m_modelGeometry->addAttribute(attr);
            }
 
            // deindex data
            QByteArray unindexedVertexData;
            quint32 primitiveCount = indexBuffer.size();
            auto indexAttribute = attributeBySemantic(geometry, QQuick3DGeometry::Attribute::IndexSemantic);
            bool u16IndexType = indexAttribute.componentType == QQuick3DGeometry::Attribute::U16Type;
            if (u16IndexType)
                primitiveCount /= 6;
            else
                primitiveCount /= 12;
 
            unindexedVertexData.resize(geometry->stride() * primitiveCount * 3);
            m_centerData.resize(primitiveCount);
            m_particleCount = primitiveCount;
            copyToUnindexedVertices(unindexedVertexData,
                                    m_centerData,
                                    m_maxTriangleRadius,
                                    vertexBuffer,
                                    geometry->stride(),
                                    attributeBySemantic(geometry, QQuick3DGeometry::Attribute::PositionSemantic).offset,
                                    indexBuffer,
                                    u16IndexType,
                                    primitiveCount);
 
            m_modelGeometry->setVertexData(unindexedVertexData);
            m_model->setGeometry(m_modelGeometry);
        } else {
            // can use provided geometry directly
            quint32 primitiveCount = vertexBuffer.size() / geometry->stride() / 3;
            m_centerData.resize(primitiveCount);
            m_particleCount = primitiveCount;
            getVertexCenterData(m_centerData,
                                m_maxTriangleRadius,
                                vertexBuffer,
                                geometry->stride(),
                                attributeBySemantic(geometry, QQuick3DGeometry::Attribute::PositionSemantic).offset,
                                primitiveCount);
        }
    } else {
        const QQmlContext *context = qmlContext(this);
        QString src = m_model->source().toString();
        if (context && !src.startsWith(QLatin1Char('#')))
            src = QQmlFile::urlToLocalFileOrQrc(context->resolvedUrl(m_model->source()));
        QSSGMesh::Mesh mesh = loadModelBlendParticleMesh(src);
        if (!mesh.isValid()) {
            qWarning () << "ModelBlendParticle3D: Unable to load mesh: " << src;
            return;
        }
        if (mesh.drawMode() != QSSGMesh::Mesh::DrawMode::Triangles) {
            qWarning () << "ModelBlendParticle3D: Invalid mesh primitive type, must be Triangles. ";
            return;
        }
 
        m_modelGeometry = new QQuick3DGeometry;
 
        const auto vertexBuffer = mesh.vertexBuffer();
        const auto indexBuffer = mesh.indexBuffer();
 
        const auto entryOffset = [&](const QSSGMesh::Mesh::VertexBuffer &vb, const QByteArray &name) -> int {
            for (const auto &e : vb.entries) {
                if (e.name == name) {
                    Q_ASSERT(e.componentType == QSSGMesh::Mesh::ComponentType::Float32);
                    return e.offset;
                }
            }
            Q_ASSERT(0);
            return -1;
        };
        const auto toAttribute = [&](const QSSGMesh::Mesh::VertexBufferEntry &e) -> QQuick3DGeometry::Attribute {
            QQuick3DGeometry::Attribute a;
            a.componentType = QQuick3DGeometryPrivate::toComponentType(e.componentType);
            a.offset = e.offset;
            a.semantic = QQuick3DGeometryPrivate::semanticFromName(e.name);
            return a;
        };
 
        const auto indexedPrimitiveCount = [&](const QSSGMesh::Mesh::IndexBuffer &indexBuffer) -> quint32 {
            if (indexBuffer.componentType == QSSGMesh::Mesh::ComponentType::UnsignedInt16)
                return quint32(indexBuffer.data.size() / sizeof(quint16) / 3);
            return quint32(indexBuffer.data.size() / sizeof(quint32) / 3);
        };
 
        if (indexBuffer.data.size()) {
            // deindex data
            QByteArray unindexedVertexData;
            quint32 primitiveCount = indexedPrimitiveCount(indexBuffer);
            bool u16IndexType = indexBuffer.componentType == QSSGMesh::Mesh::ComponentType::UnsignedInt16;
            unindexedVertexData.resize(vertexBuffer.stride * primitiveCount * 3);
            m_centerData.resize(primitiveCount);
            m_particleCount = primitiveCount;
 
            copyToUnindexedVertices(unindexedVertexData,
                                    m_centerData,
                                    m_maxTriangleRadius,
                                    vertexBuffer.data,
                                    vertexBuffer.stride,
                                    entryOffset(vertexBuffer, QByteArray(QSSGMesh::MeshInternal::getPositionAttrName())),
                                    indexBuffer.data,
                                    u16IndexType,
                                    primitiveCount);
            m_modelGeometry->setBounds(mesh.subsets().first().bounds.min, mesh.subsets().first().bounds.max);
            m_modelGeometry->setStride(vertexBuffer.stride);
            m_modelGeometry->setVertexData(unindexedVertexData);
            m_modelGeometry->setPrimitiveType(QQuick3DGeometry::PrimitiveType::Triangles);
        } else {
            // can use vertexbuffer directly
            quint32 primitiveCount = vertexBuffer.data.size() / vertexBuffer.stride / 3;
            m_centerData.resize(primitiveCount);
            m_particleCount = primitiveCount;
            getVertexCenterData(m_centerData,
                                m_maxTriangleRadius,
                                vertexBuffer.data,
                                vertexBuffer.stride,
                                entryOffset(vertexBuffer, QByteArray(QSSGMesh::MeshInternal::getPositionAttrName())),
                                primitiveCount);
            m_modelGeometry->setBounds(mesh.subsets().first().bounds.min, mesh.subsets().first().bounds.max);
            m_modelGeometry->setStride(vertexBuffer.stride);
            m_modelGeometry->setVertexData(vertexBuffer.data);
            m_modelGeometry->setPrimitiveType(QQuick3DGeometry::PrimitiveType::Triangles);
        }
        for (auto &e : vertexBuffer.entries)
            m_modelGeometry->addAttribute(toAttribute(e));
        for (auto &s : mesh.subsets())
            m_modelGeometry->addSubset(s.offset, s.count, s.bounds.min, s.bounds.max, s.name);
 
        m_model->setSource({});
        m_model->setGeometry(m_modelGeometry);
    }
 
    QMatrix4x4 transform = m_model->sceneTransform();
    if (m_model->parentNode())
        transform = m_model->parentNode()->sceneTransform().inverted() * transform;
    const QVector3D scale = mat44::getScale(transform);
    // Take max component scale for a conservative bounds estimation
    const float scaleMax = qMax(scale.x(), qMax(scale.y(), scale.z()));
    m_maxTriangleRadius *= scaleMax;
 
    m_triangleParticleData.resize(m_particleCount);
    m_particleData.resize(m_particleCount);
    m_particleData.fill({});
    for (int i = 0; i < m_particleCount; i++) {
        m_triangleParticleData[i].center = m_centerData[i];
        m_centerData[i] = transform.map(m_centerData[i]);
        if (m_modelBlendMode == Construct) {
            m_triangleParticleData[i].size = 0.0f;
        } else {
            m_triangleParticleData[i].size = 1.0f;
            m_triangleParticleData[i].position = m_centerData[i];
        }
    }
    QQuick3DParticle::doSetMaxAmount(m_particleCount);
}
 
QSSGRenderGraphObject *QQuick3DParticleModelBlendParticle::updateSpatialNode(QSSGRenderGraphObject *node)
{
    if (!m_model)
        return node;
    auto *spatialNode = QQuick3DObjectPrivate::get(m_model)->spatialNode;
    if (!spatialNode) {
        spatialNode = QQuick3DObjectPrivate::updateSpatialNode(m_model, nullptr);
        QQuick3DObjectPrivate::get(m_model)->spatialNode = spatialNode;
        Q_QUICK3D_PROFILE_ASSIGN_ID_SG(this, spatialNode);
    }
    auto *geometrySpatialNode = QQuick3DObjectPrivate::get(m_modelGeometry)->spatialNode;
    if (geometrySpatialNode)
        Q_QUICK3D_PROFILE_ASSIGN_ID_SG(this, geometrySpatialNode);
 
    QSSGRenderModel *model = static_cast<QSSGRenderModel *>(spatialNode);
 
    if (!model->particleBuffer) {
        QSSGParticleBuffer *buffer = model->particleBuffer = new QSSGParticleBuffer;
        buffer->resize(m_particleCount, sizeof(QSSGTriangleParticle));
    }
    QQuick3DParticleSystem *psystem = QQuick3DParticle::system();
    QMatrix4x4 particleMatrix = psystem->sceneTransform().inverted() * m_model->sceneTransform();
    model->particleMatrix = particleMatrix.inverted();
    model->hasTransparency = fadeInEffect() == QQuick3DParticle::FadeOpacity || fadeOutEffect() == QQuick3DParticle::FadeOpacity;
    updateParticleBuffer(model->particleBuffer, psystem->sceneTransform());
 
    return node;
}
 
void QQuick3DParticleModelBlendParticle::componentComplete()
{
    if (!system() && qobject_cast<QQuick3DParticleSystem *>(parentItem()))
        setSystem(qobject_cast<QQuick3DParticleSystem *>(parentItem()));
 
    // don't call particles componentComplete, we don't wan't to emit maxAmountChanged yet
    QQuick3DObject::componentComplete();
    regenerate();
}
 
void QQuick3DParticleModelBlendParticle::doSetMaxAmount(int)
{
    qWarning() << "ModelBlendParticle3D.maxAmount: Unable to set maximum amount, because it is set from the model.";
    return;
}
 
int QQuick3DParticleModelBlendParticle::nextCurrentIndex(const QQuick3DParticleEmitter *emitter)
{
    if (!m_perEmitterData.contains(emitter)) {
        m_perEmitterData.insert(emitter, PerEmitterData());
        auto &perEmitter = m_perEmitterData[emitter];
        perEmitter.emitter = emitter;
        perEmitter.emitterIndex = m_nextEmitterIndex++;
    }
    auto &perEmitter = m_perEmitterData[emitter];
    int index = QQuick3DParticle::nextCurrentIndex(emitter);
    if (m_triangleParticleData[index].emitterIndex != perEmitter.emitterIndex) {
        if (m_triangleParticleData[index].emitterIndex >= 0)
            perEmitterData(m_triangleParticleData[index].emitterIndex).particleCount--;
        perEmitter.particleCount++;
    }
    m_triangleParticleData[index].emitterIndex = perEmitter.emitterIndex;
    return index;
}
 
 
void QQuick3DParticleModelBlendParticle::setParticleData(int particleIndex,
                                                         const QVector3D &position,
                                                         const QVector3D &rotation,
                                                         const QVector4D &color,
                                                         float size, float age)
{
    auto &dst = m_triangleParticleData[particleIndex];
    dst = {position, rotation, dst.center, color, age, size, dst.emitterIndex};
    m_dataChanged = true;
}
 
QQuick3DParticleModelBlendParticle::PerEmitterData &QQuick3DParticleModelBlendParticle::perEmitterData(int emitterIndex)
{
    for (auto &perEmitter : m_perEmitterData) {
        if (perEmitter.emitterIndex == emitterIndex)
            return perEmitter;
    }
    return n_noPerEmitterData;
}
 
void QQuick3DParticleModelBlendParticle::updateParticleBuffer(QSSGParticleBuffer *buffer, const QMatrix4x4 &sceneTransform)
{
    const auto &particles = m_triangleParticleData;
 
    if (!buffer || !m_dataChanged)
        return;
 
    const int particleCount = m_particleCount;
 
    char *dest = buffer->pointer();
    const TriangleParticleData *src = particles.data();
    const int pps = buffer->particlesPerSlice();
    const int ss = buffer->sliceStride();
    const int slices = buffer->sliceCount();
    const float c_degToRad = float(M_PI / 180.0f);
    int i = 0;
    QSSGBounds3 bounds;
    for (int s = 0; s < slices; s++) {
        QSSGTriangleParticle *dp = reinterpret_cast<QSSGTriangleParticle *>(dest);
        for (int p = 0; p < pps && i < particleCount; ) {
            if (src->size > 0.0f)
                bounds.include(src->position);
            dp->position = src->position;
            dp->rotation = src->rotation * c_degToRad;
            dp->color = src->color;
            dp->age = src->age;
            dp->center = src->center;
            dp->size = src->size;
            dp++;
            p++;
            i++;
            src++;
        }
        dest += ss;
    }
 
    bounds.fatten(m_maxTriangleRadius);
    bounds.transform(sceneTransform);
    buffer->setBounds(bounds);
    m_dataChanged = false;
}
 
void QQuick3DParticleModelBlendParticle::itemChange(QQuick3DObject::ItemChange change,
                                                    const QQuick3DObject::ItemChangeData &value)
{
    QQuick3DObject::itemChange(change, value);
    if (change == ItemParentHasChanged && value.sceneManager)
        regenerate();
}
 
void QQuick3DParticleModelBlendParticle::reset()
{
    QQuick3DParticle::reset();
    if (m_particleCount) {
        for (int i = 0; i < m_particleCount; i++) {
            if (m_modelBlendMode == Construct) {
                m_triangleParticleData[i].size = 0.0f;
            } else {
                m_triangleParticleData[i].size = 1.0f;
                m_triangleParticleData[i].position = m_triangleParticleData[i].center;
            }
        }
    }
}
 
QVector3D QQuick3DParticleModelBlendParticle::particleCenter(int particleIndex) const
{
    return m_centerData[particleIndex];
}
 
bool QQuick3DParticleModelBlendParticle::lastParticle() const
{
    return m_currentIndex >= m_maxAmount - 1;
}
 
static QMatrix3x3 qt_fromEulerRotation(const QVector3D &eulerRotation)
{
    float x = qDegreesToRadians(eulerRotation.x());
    float y = qDegreesToRadians(eulerRotation.y());
    float z = qDegreesToRadians(eulerRotation.z());
    float a = cos(x);
    float b = sin(x);
    float c = cos(y);
    float d = sin(y);
    float e = cos(z);
    float f = sin(z);
    QMatrix3x3 ret;
    float bd = b * d;
    float ad = a * d;
    ret(0,0) = c * e;
    ret(0,1) = -c * f;
    ret(0,2) = d;
    ret(1,0) = bd * e + a * f;
    ret(1,1) = a * e - bd * f;
    ret(1,2) = -b * c;
    ret(2,0) = b * f - ad * e;
    ret(2,1) = ad * f + b * e;
    ret(2,2) = a * c;
    return ret;
}
 
void QQuick3DParticleModelBlendParticle::handleEndNodeChanged()
{
    if (m_endNode && m_model) {
        if (!m_model->rotation().isIdentity()) {
            // Use the same function as the shader for end node rotation so that they produce same matrix
            QMatrix3x3 r1 = qt_fromEulerRotation(m_endNode->eulerRotation());
            QMatrix3x3 r2 = m_model->rotation().toRotationMatrix();
            QMatrix3x3 r = r2 * r1.transposed() * r2.transposed();
            m_endNodeRotation = m_endNode->eulerRotation();
            m_endRotationMatrix = QMatrix4x4(r);
        } else {
            m_endNodeRotation = m_endNode->eulerRotation();
            m_endRotationMatrix = QMatrix4x4(m_endNode->rotation().toRotationMatrix().transposed());
        }
        m_endNodePosition = m_endNode->position();
        m_endNodeScale = m_endNode->scale();
    } else {
        m_endNodePosition = QVector3D();
        m_endNodeRotation = QVector3D();
        m_endNodeScale = QVector3D(1.0f, 1.0f, 1.0f);
        m_endRotationMatrix.setToIdentity();
    }
}
 
QVector3D QQuick3DParticleModelBlendParticle::particleEndPosition(int idx) const
{
    return m_endRotationMatrix.map(QVector3D(m_endNodeScale * m_centerData[idx])) + m_endNodePosition;
}
 
QVector3D QQuick3DParticleModelBlendParticle::particleEndRotation(int) const
{
    return m_endNodeRotation;
}
 
int QQuick3DParticleModelBlendParticle::randomIndex(int particleIndex)
{
    if (m_randomParticles.isEmpty()) {
        m_randomParticles.resize(m_maxAmount);
        for (int i = 0; i < m_maxAmount; i++)
            m_randomParticles[i] = i;
 
        // Randomize particle indices just once
        QRandomGenerator rand(system()->rand()->generator());
        for (int i = 0; i < m_maxAmount; i++) {
            int ridx = rand.generate() % m_maxAmount;
            if (i != ridx)
                qSwap(m_randomParticles[i], m_randomParticles[ridx]);
        }
    }
    return m_randomParticles[particleIndex];
}
 
QT_END_NAMESPACE