Revision control
++ // 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
++
++ #include "qplanegeometry.h"
++ #include "qplanegeometry_p.h"
++
++ #include <Qt3DCore/qattribute.h>
++ #include <Qt3DCore/qbuffer.h>
++
++ #include <limits>
++
++ QT_BEGIN_NAMESPACE
++
++
++ namespace Qt3DExtras {
++
++ using namespace Qt3DCore;
++
++ namespace {
++
++ QByteArray createPlaneVertexData(float w, float h, const QSize &resolution, bool mirrored)
++ {
++ Q_ASSERT(w > 0.0f);
++ Q_ASSERT(h > 0.0f);
++ Q_ASSERT(resolution.width() >= 2);
++ Q_ASSERT(resolution.height() >= 2);
++
++ const int nVerts = resolution.width() * resolution.height();
++
++ // Populate a buffer with the interleaved per-vertex data with
++ // vec3 pos, vec2 texCoord, vec3 normal, vec4 tangent
++ const quint32 elementSize = 3 + 2 + 3 + 4;
++ const quint32 stride = elementSize * sizeof(float);
++ QByteArray bufferBytes;
++ bufferBytes.resize(stride * nVerts);
++ float* fptr = reinterpret_cast<float*>(bufferBytes.data());
++
++ const float x0 = -w / 2.0f;
++ const float z0 = -h / 2.0f;
++ const float dx = w / (resolution.width() - 1);
++ const float dz = h / (resolution.height() - 1);
++ const float du = 1.0 / (resolution.width() - 1);
++ const float dv = 1.0 / (resolution.height() - 1);
++
++ // Iterate over z
++ for (int j = 0; j < resolution.height(); ++j) {
++ const float z = z0 + static_cast<float>(j) * dz;
++ const float v = static_cast<float>(j) * dv;
++
++ // Iterate over x
++ for (int i = 0; i < resolution.width(); ++i) {
++ const float x = x0 + static_cast<float>(i) * dx;
++ const float u = static_cast<float>(i) * du;
++
++ // position
++ *fptr++ = x;
++ *fptr++ = 0.0;
++ *fptr++ = z;
++
++ // texture coordinates
++ *fptr++ = u;
++ *fptr++ = mirrored ? 1.0f - v : v;
++
++ // normal
++ *fptr++ = 0.0f;
++ *fptr++ = 1.0f;
++ *fptr++ = 0.0f;
++
++ // tangent
++ *fptr++ = 1.0f;
++ *fptr++ = 0.0f;
++ *fptr++ = 0.0f;
++ *fptr++ = 1.0f;
++ }
++ }
++
++ return bufferBytes;
++ }
++
++ QByteArray createPlaneIndexData(const QSize &resolution)
++ {
++ // Create the index data. 2 triangles per rectangular face
++ const int faces = 2 * (resolution.width() - 1) * (resolution.height() - 1);
++ const qsizetype indices = 3 * faces;
++ Q_ASSERT(indices < std::numeric_limits<quint16>::max());
++ QByteArray indexBytes;
++ indexBytes.resize(indices * sizeof(quint16));
++ quint16* indexPtr = reinterpret_cast<quint16*>(indexBytes.data());
++
++ // Iterate over z
++ for (int j = 0; j < resolution.height() - 1; ++j) {
++ const int rowStartIndex = j * resolution.width();
++ const int nextRowStartIndex = (j + 1) * resolution.width();
++
++ // Iterate over x
++ for (int i = 0; i < resolution.width() - 1; ++i) {
++ // Split quad into two triangles
++ *indexPtr++ = rowStartIndex + i;
++ *indexPtr++ = nextRowStartIndex + i;
++ *indexPtr++ = rowStartIndex + i + 1;
++
++ *indexPtr++ = nextRowStartIndex + i;
++ *indexPtr++ = nextRowStartIndex + i + 1;
++ *indexPtr++ = rowStartIndex + i + 1;
++ }
++ }
++
++ return indexBytes;
++ }
++
++ } // anonymous
++
++ /*!
++ * \qmltype PlaneGeometry
++ * \nativetype Qt3DExtras::QPlaneGeometry
++ * \inqmlmodule Qt3D.Extras
++ * \brief PlaneGeometry allows creation of a plane in 3D space.
++ *
++ * The PlaneGeometry type is most commonly used internally by the PlaneMesh type
++ * but can also be used in custom GeometryRenderer types.
++ */
++
++ /*!
++ * \qmlproperty real PlaneGeometry::width
++ *
++ * Holds the plane width.
++ */
++
++ /*!
++ * \qmlproperty real PlaneGeometry::height
++ *
++ * Holds the plane height.
++ */
++
++ /*!
++ * \qmlproperty size PlaneGeometry::resolution
++ *
++ * Holds the plane resolution.
++ */
++
++ /*!
++ * \qmlproperty bool PlaneGeometry::mirrored
++ * \since 5.9
++ *
++ * Controls if the UV coordinates of the plane should be flipped vertically.
++ */
++
++ /*!
++ * \qmlproperty Attribute PlaneGeometry::positionAttribute
++ *
++ * Holds the geometry position attribute.
++ */
++
++ /*!
++ * \qmlproperty Attribute PlaneGeometry::normalAttribute
++ *
++ * Holds the geometry normal attribute.
++ */
++
++ /*!
++ * \qmlproperty Attribute PlaneGeometry::texCoordAttribute
++ *
++ * Holds the geometry texture coordinate attribute.
++ */
++
++ /*!
++ * \qmlproperty Attribute PlaneGeometry::tangentAttribute
++ *
++ * Holds the geometry tangent attribute.
++ */
++
++ /*!
++ * \qmlproperty Attribute PlaneGeometry::indexAttribute
++ *
++ * Holds the geometry index attribute.
++ */
++
++ /*!
++ * \class Qt3DExtras::QPlaneGeometry
++ * \ingroup qt3d-extras-geometries
++ * \inheaderfile Qt3DExtras/QPlaneGeometry
++ * \inmodule Qt3DExtras
++ * \brief The QPlaneGeometry class allows creation of a plane in 3D space.
++ * \since 5.7
++ * \ingroup geometries
++ *
++ * The QPlaneGeometry class is most commonly used internally by the QPlaneMesh
++ * but can also be used in custom Qt3DRender::QGeometryRenderer subclasses.
++ */
++
++ /*!
++ * \fn Qt3DExtras::QPlaneGeometry::QPlaneGeometry(QNode *parent)
++ *
++ * Constructs a new QPlaneGeometry with \a parent.
++ */
++ QPlaneGeometry::QPlaneGeometry(QPlaneGeometry::QNode *parent)
++ : QGeometry(*new QPlaneGeometryPrivate(), parent)
++ {
++ Q_D(QPlaneGeometry);
++ d->init();
++ }
++
++ /*!
++ * \internal
++ */
++ QPlaneGeometry::QPlaneGeometry(QPlaneGeometryPrivate &dd, QNode *parent)
++ : QGeometry(dd, parent)
++ {
++ Q_D(QPlaneGeometry);
++ d->init();
++ }
++
++ /*!
++ * \internal
++ */
++ QPlaneGeometry::~QPlaneGeometry()
++ {
++ }
++
++ /*!
++ * Updates vertices based on mesh resolution, width, and height properties.
++ */
++ void QPlaneGeometry::updateVertices()
++ {
++ Q_D(QPlaneGeometry);
++ const int nVerts = d->m_meshResolution.width() * d->m_meshResolution.height();
++
++ d->m_positionAttribute->setCount(nVerts);
++ d->m_normalAttribute->setCount(nVerts);
++ d->m_texCoordAttribute->setCount(nVerts);
++ d->m_tangentAttribute->setCount(nVerts);
++ d->m_vertexBuffer->setData(d->generateVertexData());
++ }
++
++ /*!
++ * Updates indices based on mesh resolution.
++ */
++ void QPlaneGeometry::updateIndices()
++ {
++ Q_D(QPlaneGeometry);
++ const int faces = 2 * (d->m_meshResolution.width() - 1) * (d->m_meshResolution.height() - 1);
++ // Each primitive has 3 vertices
++ d->m_indexAttribute->setCount(faces * 3);
++ d->m_indexBuffer->setData(d->generateIndexData());
++
++ }
++
++ void QPlaneGeometry::setResolution(const QSize &resolution)
++ {
++ Q_D(QPlaneGeometry);
++ if (d->m_meshResolution == resolution)
++ return;
++ d->m_meshResolution = resolution;
++ updateVertices();
++ updateIndices();
++ emit resolutionChanged(resolution);
++ }
++
++ void QPlaneGeometry::setWidth(float width)
++ {
++ Q_D(QPlaneGeometry);
++ if (width == d->m_width)
++ return;
++ d->m_width = width;
++ updateVertices();
++ emit widthChanged(width);
++ }
++
++ void QPlaneGeometry::setHeight(float height)
++ {
++ Q_D(QPlaneGeometry);
++ if (height == d->m_height)
++ return;
++ d->m_height = height;
++ updateVertices();
++ emit heightChanged(height);
++ }
++
++ void QPlaneGeometry::setMirrored(bool mirrored)
++ {
++ Q_D(QPlaneGeometry);
++ if (mirrored == d->m_mirrored)
++ return;
++ d->m_mirrored = mirrored;
++ updateVertices();
++ emit mirroredChanged(mirrored);
++ }
++
++ /*!
++ * \property Qt3DExtras::QPlaneGeometry::resolution
++ *
++ * Holds the plane resolution.
++ */
++ QSize QPlaneGeometry::resolution() const
++ {
++ Q_D(const QPlaneGeometry);
++ return d->m_meshResolution;
++ }
++
++ /*!
++ * \property Qt3DExtras::QPlaneGeometry::width
++ *
++ * Holds the plane width.
++ */
++ float QPlaneGeometry::width() const
++ {
++ Q_D(const QPlaneGeometry);
++ return d->m_width;
++ }
++
++ /*!
++ * \property Qt3DExtras::QPlaneGeometry::height
++ *
++ * Holds the plane height.
++ */
++ float QPlaneGeometry::height() const
++ {
++ Q_D(const QPlaneGeometry);
++ return d->m_height;
++ }
++
++ /*!
++ * \property Qt3DExtras::QPlaneGeometry::mirrored
++ * \since 5.9
++ *
++ * Controls if the UV coordinates of the plane should be flipped vertically.
++ */
++ bool QPlaneGeometry::mirrored() const
++ {
++ Q_D(const QPlaneGeometry);
++ return d->m_mirrored;
++ }
++
++ /*!
++ * \property Qt3DExtras::QPlaneGeometry::positionAttribute
++ *
++ * Holds the geometry position attribute.
++ */
++ QAttribute *QPlaneGeometry::positionAttribute() const
++ {
++ Q_D(const QPlaneGeometry);
++ return d->m_positionAttribute;
++ }
++
++ /*!
++ * \property Qt3DExtras::QPlaneGeometry::normalAttribute
++ *
++ * Holds the geometry normal attribute.
++ */
++ QAttribute *QPlaneGeometry::normalAttribute() const
++ {
++ Q_D(const QPlaneGeometry);
++ return d->m_normalAttribute;
++ }
++
++ /*!
++ * \property Qt3DExtras::QPlaneGeometry::texCoordAttribute
++ *
++ * Holds the geometry texture coordinate attribute.
++ */
++ QAttribute *QPlaneGeometry::texCoordAttribute() const
++ {
++ Q_D(const QPlaneGeometry);
++ return d->m_texCoordAttribute;
++ }
++
++ /*!
++ * \property Qt3DExtras::QPlaneGeometry::tangentAttribute
++ *
++ * Holds the geometry tangent attribute.
++ */
++ QAttribute *QPlaneGeometry::tangentAttribute() const
++ {
++ Q_D(const QPlaneGeometry);
++ return d->m_tangentAttribute;
++ }
++
++ /*!
++ * \property Qt3DExtras::QPlaneGeometry::indexAttribute
++ *
++ * Holds the geometry index attribute.
++ */
++ QAttribute *QPlaneGeometry::indexAttribute() const
++ {
++ Q_D(const QPlaneGeometry);
++ return d->m_indexAttribute;
++ }
++
++ QPlaneGeometryPrivate::QPlaneGeometryPrivate()
++ : QGeometryPrivate()
++ , m_width(1.0f)
++ , m_height(1.0f)
++ , m_meshResolution(QSize(2, 2))
++ , m_mirrored(false)
++ , m_positionAttribute(nullptr)
++ , m_normalAttribute(nullptr)
++ , m_texCoordAttribute(nullptr)
++ , m_tangentAttribute(nullptr)
++ , m_indexAttribute(nullptr)
++ , m_vertexBuffer(nullptr)
++ , m_indexBuffer(nullptr)
++ {
++ }
++
++ void QPlaneGeometryPrivate::init()
++ {
++ Q_Q(QPlaneGeometry);
++ m_positionAttribute = new QAttribute(q);
++ m_normalAttribute = new QAttribute(q);
++ m_texCoordAttribute = new QAttribute(q);
++ m_tangentAttribute = new QAttribute(q);
++ m_indexAttribute = new QAttribute(q);
++ m_vertexBuffer = new Qt3DCore::QBuffer(q);
++ m_indexBuffer = new Qt3DCore::QBuffer(q);
++
++ const int nVerts = m_meshResolution.width() * m_meshResolution.height();
++ const int stride = (3 + 2 + 3 + 4) * sizeof(float);
++ const int faces = 2 * (m_meshResolution.width() - 1) * (m_meshResolution.height() - 1);
++
++ 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_tangentAttribute->setName(QAttribute::defaultTangentAttributeName());
++ m_tangentAttribute->setVertexBaseType(QAttribute::Float);
++ m_tangentAttribute->setVertexSize(4);
++ m_tangentAttribute->setAttributeType(QAttribute::VertexAttribute);
++ m_tangentAttribute->setBuffer(m_vertexBuffer);
++ m_tangentAttribute->setByteStride(stride);
++ m_tangentAttribute->setByteOffset(8 * sizeof(float));
++ m_tangentAttribute->setCount(nVerts);
++
++ m_indexAttribute->setAttributeType(QAttribute::IndexAttribute);
++ m_indexAttribute->setVertexBaseType(QAttribute::UnsignedShort);
++ m_indexAttribute->setBuffer(m_indexBuffer);
++
++ // Each primitive has 3 vertives
++ 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_tangentAttribute);
++ q->addAttribute(m_indexAttribute);
++ }
++
++ QByteArray QPlaneGeometryPrivate::generateVertexData() const
++ {
++ return createPlaneVertexData(m_width, m_height, m_meshResolution, m_mirrored);
++ }
++
++ QByteArray QPlaneGeometryPrivate::generateIndexData() const
++ {
++ return createPlaneIndexData(m_meshResolution);
++ }
++
++ } // Qt3DExtras
++
++ QT_END_NAMESPACE
++
++ #include "moc_qplanegeometry.cpp"