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// Copyright (C) 2015 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
#ifndef _USE_MATH_DEFINES
# define _USE_MATH_DEFINES // For MSVC
#endif
#include "qcylindergeometry.h"
#include "qcylindergeometry_p.h"
#include <Qt3DCore/qbuffer.h>
#include <Qt3DCore/qattribute.h>
#include <QtGui/QVector3D>
#include <qmath.h>
QT_BEGIN_NAMESPACE
namespace Qt3DExtras {
using namespace Qt3DCore;
namespace {
int faceCount(int slices, int rings)
{
return (slices * 2) * (rings - 1) // two tris per side, for each pair of adjacent rings
+ slices * 2; // two caps
}
int vertexCount(int slices, int rings)
{
return (slices + 1) * rings + 2 * (slices + 1) + 2;
}
void createSidesVertices(float *&verticesPtr,
int rings,
int slices,
double radius,
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;
for (int slice = 0; slice <= slices; ++slice) {
const float theta = static_cast<float>(slice) * dTheta;
const float ct = qCos(theta);
const float st = qSin(theta);
*verticesPtr++ = radius * ct;
*verticesPtr++ = y;
*verticesPtr++ = radius * st;
*verticesPtr++ = (y + length / 2.0) / length;
*verticesPtr++ = theta / (M_PI * 2);
QVector3D n(ct, 0.0f, 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) {
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 radius,
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 = qCos(theta);
const float st = qSin(theta);
*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,
double yPosition)
{
const double yNormal = (yPosition < 0.0f) ? -1.0f : 1.0f;
for (int slice = 0; slice < slices; ++slice) {
const int nextSlice = slice + 1;
*indicesPtr++ = discCenterIndex;
*indicesPtr++ = (discCenterIndex + 1 + nextSlice);
*indicesPtr++ = (discCenterIndex + 1 + slice);
if (yNormal < 0.0f)
qSwap(*(indicesPtr -1), *(indicesPtr - 2));
}
}
} // anonymous
QCylinderGeometryPrivate::QCylinderGeometryPrivate()
: QGeometryPrivate()
, m_rings(16)
, m_slices(16)
, m_radius(1.0f)
, m_length(1.0f)
, m_positionAttribute(nullptr)
, m_normalAttribute(nullptr)
, m_texCoordAttribute(nullptr)
, m_indexAttribute(nullptr)
, m_vertexBuffer(nullptr)
, m_indexBuffer(nullptr)
{
}
void QCylinderGeometryPrivate::init()
{
Q_Q(QCylinderGeometry);
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 nVerts = vertexCount(m_slices, m_rings);
const int faces = faceCount(m_slices, m_rings);
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 QCylinderGeometryPrivate::generateVertexData() const
{
const int verticesCount = vertexCount(m_slices, m_rings);
// 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_radius, m_length);
createDiscVertices(verticesPtr, m_slices, m_radius, -m_length * 0.5f);
createDiscVertices(verticesPtr, m_slices, m_radius, m_length * 0.5f);
return verticesData;
}
QByteArray QCylinderGeometryPrivate::generateIndexData() const
{
const int facesCount = faceCount(m_slices, m_rings);
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);
createDiscIndices(indicesPtr, m_rings * (m_slices + 1), m_slices, -m_length * 0.5);
createDiscIndices(indicesPtr, m_rings * (m_slices + 1) + m_slices + 2, m_slices, m_length * 0.5);
Q_ASSERT(indicesPtr == (reinterpret_cast<quint16*>(indicesBytes.data()) + indicesCount));
return indicesBytes;
}
/*!
* \qmltype CylinderGeometry
* \nativetype Qt3DExtras::QCylinderGeometry
* \inqmlmodule Qt3D.Extras
* \brief CylinderGeometry allows creation of a cylinder in 3D space.
*
* The CylinderGeometry type is most commonly used internally by the CylinderMesh type
* but can also be used in custom GeometryRenderer types.
*/
/*!
* \qmlproperty int CylinderGeometry::rings
*
* Holds the number of rings in the cylinder.
*/
/*!
* \qmlproperty int CylinderGeometry::slices
*
* Holds the number of slices in the cylinder.
*/
/*!
* \qmlproperty real CylinderGeometry::radius
*
* Holds the radius of the cylinder.
*/
/*!
* \qmlproperty real CylinderGeometry::length
*
* Holds the length of the cylinder.
*/
/*!
* \qmlproperty Attribute CylinderGeometry::positionAttribute
*
* Holds the geometry position attribute.
*/
/*!
* \qmlproperty Attribute CylinderGeometry::normalAttribute
*
* Holds the geometry normal attribute.
*/
/*!
* \qmlproperty Attribute CylinderGeometry::texCoordAttribute
*
* Holds the geometry texture coordinate attribute.
*/
/*!
* \qmlproperty Attribute CylinderGeometry::indexAttribute
*
* Holds the geometry index attribute.
*/
/*!
* \class Qt3DExtras::QCylinderGeometry
* \ingroup qt3d-extras-geometries
* \inheaderfile Qt3DExtras/QCylinderGeometry
* \inmodule Qt3DExtras
* \brief The QCylinderGeometry class allows creation of a cylinder in 3D space.
* \since 5.7
* \ingroup geometries
* \inherits Qt3DCore::QGeometry
*
* The QCylinderGeometry class is most commonly used internally by the QCylinderMesh
* but can also be used in custom Qt3DRender::QGeometryRenderer subclasses.
*/
/*!
* Constructs a new QCylinderMesh with \a parent.
*/
QCylinderGeometry::QCylinderGeometry(QNode *parent)
: QGeometry(*new QCylinderGeometryPrivate, parent)
{
Q_D(QCylinderGeometry);
d->init();
}
/*!
* \internal
*/
QCylinderGeometry::QCylinderGeometry(QCylinderGeometryPrivate &dd, QNode *parent)
:QGeometry(dd, parent)
{
Q_D(QCylinderGeometry);
d->init();
}
/*!
* \internal
*/
QCylinderGeometry::~QCylinderGeometry()
{
}
/*!
* Updates the vertices based on rings, slices, and length properties.
*/
void QCylinderGeometry::updateVertices()
{
Q_D(QCylinderGeometry);
const int nVerts = vertexCount(d->m_slices, d->m_rings);
d->m_positionAttribute->setCount(nVerts);
d->m_texCoordAttribute->setCount(nVerts);
d->m_normalAttribute->setCount(nVerts);
d->m_vertexBuffer->setData(d->generateVertexData());
}
/*!
* Updates the indices based on rings, slices, and length properties.
*/
void QCylinderGeometry::updateIndices()
{
Q_D(QCylinderGeometry);
const int faces = faceCount(d->m_slices, d->m_rings);
d->m_indexAttribute->setCount(faces * 3);
d->m_indexBuffer->setData(d->generateIndexData());
}
void QCylinderGeometry::setRings(int rings)
{
Q_D(QCylinderGeometry);
if (rings != d->m_rings) {
d->m_rings = rings;
updateVertices();
updateIndices();
emit ringsChanged(rings);
}
}
void QCylinderGeometry::setSlices(int slices)
{
Q_D(QCylinderGeometry);
if (slices != d->m_slices) {
d->m_slices = slices;
updateVertices();
updateIndices();
emit slicesChanged(slices);
}
}
void QCylinderGeometry::setRadius(float radius)
{
Q_D(QCylinderGeometry);
if (radius != d->m_radius) {
d->m_radius = radius;
updateVertices();
emit radiusChanged(radius);
}
}
void QCylinderGeometry::setLength(float length)
{
Q_D(QCylinderGeometry);
if (length != d->m_length) {
d->m_length = length;
updateVertices();
updateIndices();
emit lengthChanged(length);
}
}
/*!
* \property Qt3DExtras::QCylinderGeometry::rings
*
* Holds the number of rings in the cylinder.
*/
int QCylinderGeometry::rings() const
{
Q_D(const QCylinderGeometry);
return d->m_rings;
}
/*!
* \property Qt3DExtras::QCylinderGeometry::slices
*
* Holds the number of slices in the cylinder.
*/
int QCylinderGeometry::slices() const
{
Q_D(const QCylinderGeometry);
return d->m_slices;
}
/*!
* \property Qt3DExtras::QCylinderGeometry::radius
*
* Holds the radius of the cylinder.
*/
float QCylinderGeometry::radius() const
{
Q_D(const QCylinderGeometry);
return d->m_radius;
}
/*!
* \property Qt3DExtras::QCylinderGeometry::length
*
* Holds the length of the cylinder.
*/
float QCylinderGeometry::length() const
{
Q_D(const QCylinderGeometry);
return d->m_length;
}
/*!
* \property Qt3DExtras::QCylinderGeometry::positionAttribute
*
* Holds the geometry position attribute.
*/
QAttribute *QCylinderGeometry::positionAttribute() const
{
Q_D(const QCylinderGeometry);
return d->m_positionAttribute;
}
/*!
* \property Qt3DExtras::QCylinderGeometry::normalAttribute
*
* Holds the geometry normal attribute.
*/
QAttribute *QCylinderGeometry::normalAttribute() const
{
Q_D(const QCylinderGeometry);
return d->m_normalAttribute;
}
/*!
* \property Qt3DExtras::QCylinderGeometry::texCoordAttribute
*
* Holds the geometry texture coordinate attribute.
*/
QAttribute *QCylinderGeometry::texCoordAttribute() const
{
Q_D(const QCylinderGeometry);
return d->m_texCoordAttribute;
}
/*!
* \property Qt3DExtras::QCylinderGeometry::indexAttribute
*
* Holds the geometry index attribute.
*/
QAttribute *QCylinderGeometry::indexAttribute() const
{
Q_D(const QCylinderGeometry);
return d->m_indexAttribute;
}
} // namespace Qt3DExtras
QT_END_NAMESPACE
#include "moc_qcylindergeometry.cpp"