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++ // Copyright (C) 2016 Klaralvdalens Datakonsult AB (KDAB).
++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
++
++ /*!
++ * \class Qt3DExtras::QConeGeometry
++ * \ingroup qt3d-extras-geometries
++ * \inheaderfile Qt3DExtras/QConeGeometry
++ * \inmodule Qt3DExtras
++ * \brief The QConeGeometry class allows creation of a cone in 3D space.
++ * \since 5.7
++ * \ingroup geometries
++ * \inherits Qt3DCore::QGeometry
++ *
++ * The QConeGeometry class is most commonly used internally by the QConeMesh
++ * but can also be used in custom Qt3DRender::QGeometryRenderer subclasses. The class
++ * allows for creation of both a cone and a truncated cone.
++ */
++
++ #ifndef _USE_MATH_DEFINES
++ # define _USE_MATH_DEFINES // For MSVC
++ #endif
++
++ #include "qconegeometry.h"
++ #include "qconegeometry_p.h"
++
++ #include <Qt3DCore/qattribute.h>
++ #include <Qt3DCore/qbuffer.h>
++ #include <QtGui/QVector3D>
++
++ #include <cmath>
++
++ QT_BEGIN_NAMESPACE
++
++
++ namespace Qt3DExtras {
++
++ using namespace Qt3DCore;
++
++ namespace {
++
++ int faceCount(int slices, int rings, int capCount)
++ {
++ return (slices * 2) * (rings - 1) + slices * capCount;
++ }
++
++ int vertexCount(int slices, int rings, int capCount)
++ {
++ return (slices + 1) * rings + capCount * (slices + 2);
++ }
++
++ void createSidesVertices(float *&verticesPtr,
++ int rings,
++ int slices,
++ double topRadius,
++ double bottomRadius,
++ double length)
++ {
++ const float dY = length / static_cast<float>(rings - 1);
++ const float dTheta = (M_PI * 2) / static_cast<float>(slices);
++
++ for (int ring = 0; ring < rings; ++ring) {
++ const float y = -length / 2.0f + static_cast<float>(ring) * dY;
++
++ const float t = (y + length / 2) / length;
++ const float radius = (bottomRadius * (1 - t)) + (t * topRadius);
++
++ for (int slice = 0; slice <= slices; ++slice) {
++ const float theta = static_cast<float>(slice) * dTheta;
++ const float ta = std::tan((M_PI/2) - std::atan(length / (bottomRadius - topRadius)));
++ const float ct = std::cos(theta);
++ const float st = std::sin(theta);
++
++ *verticesPtr++ = radius * ct;
++ *verticesPtr++ = y;
++ *verticesPtr++ = radius * st;
++
++ *verticesPtr++ = (y + length / 2.0) / length;
++ *verticesPtr++ = theta / (M_PI * 2);
++
++ QVector3D n(ct, ta, st);
++ n.normalize();
++ *verticesPtr++ = n.x();
++ *verticesPtr++ = n.y();
++ *verticesPtr++ = n.z();
++ }
++ }
++ }
++
++ void createSidesIndices(quint16 *&indicesPtr, int rings, int slices)
++ {
++ for (int ring = 0; ring < rings-1; ++ring) {
++ const int ringIndexStart = ring * (slices + 1);
++ const int nextRingIndexStart = (ring + 1) * (slices + 1);
++
++ for (int slice = 0; slice <= slices; ++slice) {
++ if (slice == slices)
++ continue;
++
++ const int nextSlice = slice + 1;
++
++ *indicesPtr++ = (ringIndexStart + slice);
++ *indicesPtr++ = (nextRingIndexStart + slice);
++ *indicesPtr++ = (ringIndexStart + nextSlice);
++ *indicesPtr++ = (ringIndexStart + nextSlice);
++ *indicesPtr++ = (nextRingIndexStart + slice);
++ *indicesPtr++ = (nextRingIndexStart + nextSlice);
++ }
++ }
++ }
++
++ void createDiscVertices(float *&verticesPtr,
++ int slices,
++ double topRadius,
++ double bottomRadius,
++ double length,
++ double yPosition)
++ {
++ const float dTheta = (M_PI * 2) / static_cast<float>(slices);
++ const double yNormal = (yPosition < 0.0f) ? -1.0f : 1.0f;
++
++ *verticesPtr++ = 0.0f;
++ *verticesPtr++ = yPosition;
++ *verticesPtr++ = 0.0f;
++
++ *verticesPtr++ = 1.0f;
++ *verticesPtr++ = 0.0f;
++
++ *verticesPtr++ = 0.0f;
++ *verticesPtr++ = yNormal;
++ *verticesPtr++ = 0.0f;
++
++
++ for (int slice = 0; slice <= slices; ++slice)
++ {
++ const float theta = static_cast<float>(slice) * dTheta;
++ const float ct = std::cos(theta);
++ const float st = std::sin(theta);
++
++ const float t = (yPosition + length / 2) / length;
++ const float radius = (bottomRadius * (1 - t)) + (t * topRadius);
++
++ *verticesPtr++ = radius * ct;
++ *verticesPtr++ = yPosition;
++ *verticesPtr++ = radius * st;
++
++ *verticesPtr++ = 1.0f;
++ *verticesPtr++ = theta / (M_PI * 2);
++
++ *verticesPtr++ = 0.0f;
++ *verticesPtr++ = yNormal;
++ *verticesPtr++ = 0.0f;
++ }
++ }
++
++ void createDiscIndices(quint16 *&indicesPtr,
++ int discCenterIndex,
++ int slices,
++ bool isTopCap)
++ {
++ if ( !isTopCap ) {
++ for ( int i = slices - 1 ; i >= 0 ; --i )
++ {
++ if ( i != 0 ) {
++ *indicesPtr++ = discCenterIndex;
++ *indicesPtr++ = discCenterIndex + i + 1;
++ *indicesPtr++ = discCenterIndex + i;
++ } else {
++ *indicesPtr++ = discCenterIndex;
++ *indicesPtr++ = discCenterIndex + i + 1;
++ *indicesPtr++ = discCenterIndex + slices;
++ }
++ }
++ } else {
++ for ( int i = 0 ; i < slices; ++i )
++ {
++ if ( i != slices - 1 ) {
++ *indicesPtr++ = discCenterIndex;
++ *indicesPtr++ = discCenterIndex + i + 1;
++ *indicesPtr++ = discCenterIndex + i + 2;
++ } else {
++ *indicesPtr++ = discCenterIndex;
++ *indicesPtr++ = discCenterIndex + i + 1;
++ *indicesPtr++ = discCenterIndex + 1;
++ }
++ }
++ }
++ }
++
++ } // anonymous
++
++ QConeGeometryPrivate::QConeGeometryPrivate()
++ : QGeometryPrivate()
++ , m_hasTopEndcap(true)
++ , m_hasBottomEndcap(true)
++ , m_rings(16)
++ , m_slices(16)
++ , m_topRadius(0.0f)
++ , m_bottomRadius(1.0f)
++ , m_length(1.0f)
++ , m_positionAttribute(nullptr)
++ , m_normalAttribute(nullptr)
++ , m_texCoordAttribute(nullptr)
++ , m_indexAttribute(nullptr)
++ , m_positionBuffer(nullptr)
++ , m_vertexBuffer(nullptr)
++ , m_indexBuffer(nullptr)
++ {
++ }
++
++ void QConeGeometryPrivate::init()
++ {
++ Q_Q(QConeGeometry);
++ m_positionAttribute = new QAttribute(q);
++ m_normalAttribute = new QAttribute(q);
++ m_texCoordAttribute = new QAttribute(q);
++ m_indexAttribute = new QAttribute(q);
++ m_vertexBuffer = new Qt3DCore::QBuffer(q);
++ m_indexBuffer = new Qt3DCore::QBuffer(q);
++
++ // vec3 pos, vec2 tex, vec3 normal
++ const quint32 elementSize = 3 + 2 + 3;
++ const quint32 stride = elementSize * sizeof(float);
++ const int faces = faceCount(m_slices, m_rings, (m_hasTopEndcap + m_hasBottomEndcap));
++ const int nVerts = vertexCount(m_slices, m_rings, (m_hasTopEndcap + m_hasBottomEndcap));
++
++ m_positionAttribute->setName(QAttribute::defaultPositionAttributeName());
++ m_positionAttribute->setVertexBaseType(QAttribute::Float);
++ m_positionAttribute->setVertexSize(3);
++ m_positionAttribute->setAttributeType(QAttribute::VertexAttribute);
++ m_positionAttribute->setBuffer(m_vertexBuffer);
++ m_positionAttribute->setByteStride(stride);
++ m_positionAttribute->setCount(nVerts);
++
++ m_texCoordAttribute->setName(QAttribute::defaultTextureCoordinateAttributeName());
++ m_texCoordAttribute->setVertexBaseType(QAttribute::Float);
++ m_texCoordAttribute->setVertexSize(2);
++ m_texCoordAttribute->setAttributeType(QAttribute::VertexAttribute);
++ m_texCoordAttribute->setBuffer(m_vertexBuffer);
++ m_texCoordAttribute->setByteStride(stride);
++ m_texCoordAttribute->setByteOffset(3 * sizeof(float));
++ m_texCoordAttribute->setCount(nVerts);
++
++ m_normalAttribute->setName(QAttribute::defaultNormalAttributeName());
++ m_normalAttribute->setVertexBaseType(QAttribute::Float);
++ m_normalAttribute->setVertexSize(3);
++ m_normalAttribute->setAttributeType(QAttribute::VertexAttribute);
++ m_normalAttribute->setBuffer(m_vertexBuffer);
++ m_normalAttribute->setByteStride(stride);
++ m_normalAttribute->setByteOffset(5 * sizeof(float));
++ m_normalAttribute->setCount(nVerts);
++
++ m_indexAttribute->setAttributeType(QAttribute::IndexAttribute);
++ m_indexAttribute->setVertexBaseType(QAttribute::UnsignedShort);
++ m_indexAttribute->setBuffer(m_indexBuffer);
++
++ m_indexAttribute->setCount(faces * 3);
++
++ m_vertexBuffer->setData(generateVertexData());
++ m_indexBuffer->setData(generateIndexData());
++
++ q->addAttribute(m_positionAttribute);
++ q->addAttribute(m_texCoordAttribute);
++ q->addAttribute(m_normalAttribute);
++ q->addAttribute(m_indexAttribute);
++ }
++
++ QByteArray QConeGeometryPrivate::generateVertexData() const
++ {
++ const int verticesCount =
++ vertexCount(m_slices, m_rings, (m_hasTopEndcap + m_hasBottomEndcap));
++
++ // vec3 pos, vec2 texCoord, vec3 normal
++ const quint32 vertexSize = (3 + 2 + 3) * sizeof(float);
++
++ QByteArray verticesData;
++ verticesData.resize(vertexSize * verticesCount);
++ float *verticesPtr = reinterpret_cast<float*>(verticesData.data());
++
++ createSidesVertices(verticesPtr, m_rings, m_slices, m_topRadius, m_bottomRadius, m_length);
++ if ( m_hasTopEndcap )
++ createDiscVertices(verticesPtr, m_slices, m_topRadius, m_bottomRadius, m_length, m_length * 0.5f);
++ if ( m_hasBottomEndcap )
++ createDiscVertices(verticesPtr, m_slices, m_topRadius, m_bottomRadius, m_length, -m_length * 0.5f);
++
++ return verticesData;
++ }
++
++ QByteArray QConeGeometryPrivate::generateIndexData() const
++ {
++ const int facesCount = faceCount(m_slices, m_rings, (m_hasTopEndcap + m_hasBottomEndcap));
++
++ const int indicesCount = facesCount * 3;
++ const int indexSize = sizeof(quint16);
++ Q_ASSERT(indicesCount < 65536);
++
++ QByteArray indicesBytes;
++ indicesBytes.resize(indicesCount * indexSize);
++ quint16 *indicesPtr = reinterpret_cast<quint16*>(indicesBytes.data());
++
++ createSidesIndices(indicesPtr, m_rings, m_slices);
++ if ( m_hasTopEndcap )
++ createDiscIndices(indicesPtr, m_rings * (m_slices + 1) + m_slices + 2, m_slices, true);
++ if ( m_hasBottomEndcap )
++ createDiscIndices(indicesPtr, m_rings * (m_slices + 1), m_slices, false);
++
++ return indicesBytes;
++ }
++
++ /*!
++ * \qmltype ConeGeometry
++ * \nativetype Qt3DExtras::QConeGeometry
++ * \inqmlmodule Qt3D.Extras
++ * \brief ConeGeometry allows creation of a cone in 3D space.
++ *
++ * The ConeGeometry type is most commonly used internally by the ConeMesh type
++ * but can also be used in custom GeometryRenderer types.
++ * The ConeGeometry type allows for creation of both a cone and a truncated cone.
++ */
++
++ /*!
++ * \qmlproperty bool ConeGeometry::hasTopEndcap
++ *
++ * Determines if the cone top is capped or open.
++ */
++
++ /*!
++ * \qmlproperty bool ConeGeometry::hasBottomEndcap
++ *
++ * Determines if the cone bottom is capped or open.
++ */
++
++ /*!
++ * \qmlproperty int ConeGeometry::rings
++ *
++ * Holds the number of rings in the geometry.
++ */
++
++ /*!
++ * \qmlproperty int ConeGeometry::slices
++ *
++ * Holds the number of slices in the geometry.
++ */
++
++ /*!
++ * \qmlproperty real ConeGeometry::topRadius
++ *
++ * Holds the top radius of the cone.
++ */
++
++ /*!
++ * \qmlproperty real ConeGeometry::bottomRadius
++ *
++ * Holds the bottom radius of the cone.
++ */
++
++ /*!
++ * \qmlproperty real ConeGeometry::length
++ *
++ * Holds the length of the cone.
++ */
++
++ /*!
++ * \qmlproperty Attribute ConeGeometry::positionAttribute
++ *
++ * Holds the geometry position attribute.
++ */
++
++ /*!
++ * \qmlproperty Attribute ConeGeometry::normalAttribute
++ *
++ * Holds the geometry normal attribute.
++ */
++
++ /*!
++ * \qmlproperty Attribute ConeGeometry::texCoordAttribute
++ *
++ * Holds the geometry texture coordinate attribute.
++ */
++
++ /*!
++ * \qmlproperty Attribute ConeGeometry::indexAttribute
++ *
++ * Holds the geometry index attribute.
++ */
++
++ QConeGeometry::QConeGeometry(QNode *parent)
++ : QGeometry(*new QConeGeometryPrivate, parent)
++ {
++ Q_D(QConeGeometry);
++ d->init();
++ }
++
++ QConeGeometry::QConeGeometry(QConeGeometryPrivate &dd, QNode *parent)
++ :QGeometry(dd, parent)
++ {
++ Q_D(QConeGeometry);
++ d->init();
++ }
++
++
++ /*! \internal */
++ QConeGeometry::~QConeGeometry()
++ {
++ }
++
++ /*!
++ * Updates vertices based on geometry properties.
++ */
++ void QConeGeometry::updateVertices()
++ {
++ Q_D(QConeGeometry);
++ const int nVerts = vertexCount(d->m_slices, d->m_rings,
++ (d->m_hasTopEndcap + d->m_hasBottomEndcap));
++
++ d->m_positionAttribute->setCount(nVerts);
++ d->m_texCoordAttribute->setCount(nVerts);
++ d->m_normalAttribute->setCount(nVerts);
++ d->m_vertexBuffer->setData(d->generateVertexData());
++ }
++
++ /*!
++ * Updates indices based on geometry properties.
++ */
++ void QConeGeometry::updateIndices()
++ {
++ Q_D(QConeGeometry);
++ const int faces = faceCount(d->m_slices, d->m_rings,
++ (d->m_hasTopEndcap + d->m_hasBottomEndcap));
++
++ d->m_indexAttribute->setCount(faces * 3);
++ d->m_indexBuffer->setData(d->generateIndexData());
++ }
++
++ /*!
++ * \property Qt3DExtras::QConeGeometry::hasTopEndcap
++ *
++ * Determines if the cone top is capped or open.
++ */
++ /*!
++ * \property Qt3DExtras::QConeGeometry::hasBottomEndcap
++ *
++ * Determines if the cone bottom is capped or open.
++ */
++
++ /*!
++ * \property Qt3DExtras::QConeGeometry::rings
++ *
++ * Holds the number of rings in the geometry.
++ */
++
++ /*!
++ * \property Qt3DExtras::QConeGeometry::slices
++ *
++ * Holds the number of slices in the geometry.
++ */
++
++ /*!
++ * \property Qt3DExtras::QConeGeometry::topRadius
++ *
++ * Holds the top radius of the cone.
++ */
++
++ /*!
++ * \property Qt3DExtras::QConeGeometry::bottomRadius
++ *
++ * Holds the bottom radius of the cone.
++ */
++
++ /*!
++ * \property Qt3DExtras::QConeGeometry::length
++ *
++ * Holds the length of the cone.
++ */
++
++ /*!
++ * \property Qt3DExtras::QConeGeometry::positionAttribute
++ *
++ * Holds the geometry position attribute.
++ */
++
++ /*!
++ * \property Qt3DExtras::QConeGeometry::normalAttribute
++ *
++ * Holds the geometry normal attribute.
++ */
++
++ /*!
++ * \property Qt3DExtras::QConeGeometry::texCoordAttribute
++ *
++ * Holds the geometry texture coordinate attribute.
++ */
++
++ /*!
++ * \property Qt3DExtras::QConeGeometry::indexAttribute
++ *
++ * Holds the geometry index attribute.
++ */
++
++ void QConeGeometry::setHasTopEndcap(bool hasTopEndcap)
++ {
++ Q_D(QConeGeometry);
++ if (hasTopEndcap != d->m_hasTopEndcap) {
++ d->m_hasTopEndcap = hasTopEndcap;
++ updateVertices();
++ emit hasTopEndcapChanged(hasTopEndcap);
++ }
++ }
++
++ void QConeGeometry::setHasBottomEndcap(bool hasBottomEndcap)
++ {
++ Q_D(QConeGeometry);
++ if (hasBottomEndcap != d->m_hasBottomEndcap) {
++ d->m_hasBottomEndcap = hasBottomEndcap;
++ updateVertices();
++ emit hasBottomEndcapChanged(hasBottomEndcap);
++ }
++ }
++
++ void QConeGeometry::setRings(int rings)
++ {
++ Q_D(QConeGeometry);
++ if (rings != d->m_rings) {
++ d->m_rings = rings;
++ updateVertices();
++ updateIndices();
++ emit ringsChanged(rings);
++ }
++ }
++
++ void QConeGeometry::setSlices(int slices)
++ {
++ Q_D(QConeGeometry);
++ if (slices != d->m_slices) {
++ d->m_slices = slices;
++ updateVertices();
++ updateIndices();
++ emit slicesChanged(slices);
++ }
++ }
++
++ void QConeGeometry::setTopRadius(float topRadius)
++ {
++ Q_D(QConeGeometry);
++ if (topRadius != d->m_topRadius) {
++ d->m_topRadius = topRadius;
++ updateVertices();
++ emit topRadiusChanged(topRadius);
++ }
++ }
++
++ void QConeGeometry::setBottomRadius(float bottomRadius)
++ {
++ Q_D(QConeGeometry);
++ if (bottomRadius != d->m_bottomRadius) {
++ d->m_bottomRadius = bottomRadius;
++ updateVertices();
++ emit bottomRadiusChanged(bottomRadius);
++ }
++ }
++
++ void QConeGeometry::setLength(float length)
++ {
++ Q_D(QConeGeometry);
++ if (length != d->m_length) {
++ d->m_length = length;
++ updateVertices();
++ updateIndices();
++ emit lengthChanged(length);
++ }
++ }
++
++ bool QConeGeometry::hasTopEndcap() const
++ {
++ Q_D(const QConeGeometry);
++ return d->m_hasTopEndcap;
++ }
++
++ bool QConeGeometry::hasBottomEndcap() const
++ {
++ Q_D(const QConeGeometry);
++ return d->m_hasBottomEndcap;
++ }
++
++ float QConeGeometry::topRadius() const
++ {
++ Q_D(const QConeGeometry);
++ return d->m_topRadius;
++ }
++
++ float QConeGeometry::bottomRadius() const
++ {
++ Q_D(const QConeGeometry);
++ return d->m_bottomRadius;
++ }
++
++ int QConeGeometry::rings() const
++ {
++ Q_D(const QConeGeometry);
++ return d->m_rings;
++ }
++
++ int QConeGeometry::slices() const
++ {
++ Q_D(const QConeGeometry);
++ return d->m_slices;
++ }
++
++ float QConeGeometry::length() const
++ {
++ Q_D(const QConeGeometry);
++ return d->m_length;
++ }
++
++ QAttribute *QConeGeometry::positionAttribute() const
++ {
++ Q_D(const QConeGeometry);
++ return d->m_positionAttribute;
++ }
++
++ QAttribute *QConeGeometry::normalAttribute() const
++ {
++ Q_D(const QConeGeometry);
++ return d->m_normalAttribute;
++ }
++
++ QAttribute *QConeGeometry::texCoordAttribute() const
++ {
++ Q_D(const QConeGeometry);
++ return d->m_texCoordAttribute;
++ }
++
++ QAttribute *QConeGeometry::indexAttribute() const
++ {
++ Q_D(const QConeGeometry);
++ return d->m_indexAttribute;
++ }
++
++ } // namespace Qt3DExtras
++
++ QT_END_NAMESPACE
++
++ #include "moc_qconegeometry.cpp"