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// Copyright (C) 2019 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0 WITH Qt-GPL-exception-1.0
#ifdef QUICK3D_MODULE
#include "camerageometry.h"
#include <QtQuick3DRuntimeRender/private/qssgrendercamera_p.h>
#include <QtQuick3D/private/qquick3dcustomcamera_p.h>
#include <QtQuick3D/private/qquick3dfrustumcamera_p.h>
#include <QtQuick3D/private/qquick3dorthographiccamera_p.h>
#include <QtQuick3D/private/qquick3dperspectivecamera_p.h>
#include <QtQuick3D/private/qquick3dutils_p.h>
#include <QtCore/qmath.h>
#include <limits>
namespace QmlDesigner {
namespace Internal {
CameraGeometry::CameraGeometry()
: GeometryBase()
{
}
CameraGeometry::~CameraGeometry()
{
}
QQuick3DCamera *CameraGeometry::camera() const
{
return m_camera;
}
QRectF CameraGeometry::viewPortRect() const
{
return m_viewPortRect;
}
void CameraGeometry::setCamera(QQuick3DCamera *camera)
{
if (m_camera == camera)
return;
if (m_camera)
m_camera->disconnect(this);
m_camera = camera;
if (auto perspectiveCamera = qobject_cast<QQuick3DPerspectiveCamera *>(m_camera)) {
QObject::connect(perspectiveCamera, &QQuick3DPerspectiveCamera::clipNearChanged,
this, &CameraGeometry::handleCameraPropertyChange);
QObject::connect(perspectiveCamera, &QQuick3DPerspectiveCamera::clipFarChanged,
this, &CameraGeometry::handleCameraPropertyChange);
QObject::connect(perspectiveCamera, &QQuick3DPerspectiveCamera::fieldOfViewChanged,
this, &CameraGeometry::handleCameraPropertyChange);
QObject::connect(perspectiveCamera, &QQuick3DPerspectiveCamera::fieldOfViewOrientationChanged,
this, &CameraGeometry::handleCameraPropertyChange);
if (auto frustumCamera = qobject_cast<QQuick3DFrustumCamera *>(m_camera)) {
QObject::connect(frustumCamera, &QQuick3DFrustumCamera::topChanged,
this, &CameraGeometry::handleCameraPropertyChange);
QObject::connect(frustumCamera, &QQuick3DFrustumCamera::bottomChanged,
this, &CameraGeometry::handleCameraPropertyChange);
QObject::connect(frustumCamera, &QQuick3DFrustumCamera::rightChanged,
this, &CameraGeometry::handleCameraPropertyChange);
QObject::connect(frustumCamera, &QQuick3DFrustumCamera::leftChanged,
this, &CameraGeometry::handleCameraPropertyChange);
}
} else if (auto orthoCamera = qobject_cast<QQuick3DOrthographicCamera *>(m_camera)) {
QObject::connect(orthoCamera, &QQuick3DOrthographicCamera::clipNearChanged,
this, &CameraGeometry::handleCameraPropertyChange);
QObject::connect(orthoCamera, &QQuick3DOrthographicCamera::clipFarChanged,
this, &CameraGeometry::handleCameraPropertyChange);
} else if (auto customCamera = qobject_cast<QQuick3DCustomCamera *>(m_camera)) {
QObject::connect(customCamera, &QQuick3DCustomCamera::projectionChanged,
this, &CameraGeometry::handleCameraPropertyChange);
}
emit cameraChanged();
handleCameraPropertyChange();
}
void CameraGeometry::setViewPortRect(const QRectF &rect)
{
if (m_viewPortRect == rect)
return;
m_viewPortRect = rect;
emit viewPortRectChanged();
updateGeometry();
}
void CameraGeometry::handleCameraPropertyChange()
{
m_cameraUpdatePending = true;
clear();
setStride(12); // To avoid div by zero inside QtQuick3D
update();
}
QSSGRenderGraphObject *CameraGeometry::updateSpatialNode(QSSGRenderGraphObject *node)
{
if (m_cameraUpdatePending) {
m_cameraUpdatePending = false;
updateGeometry();
}
return QQuick3DGeometry::updateSpatialNode(node);
}
void CameraGeometry::doUpdateGeometry()
{
if (!m_camera)
return;
// If camera properties have been updated, we need to defer updating the frustum geometry
// to the next frame to ensure camera's spatial node has been properly updated.
if (m_cameraUpdatePending) {
update();
return;
}
if (!QQuick3DObjectPrivate::get(m_camera)->spatialNode) {
// Doing explicit viewport mapping forces cameraNode creation
m_camera->mapToViewport({}, m_viewPortRect.width(), m_viewPortRect.height());
#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
if (!m_nodeCreationUpdateDone) {
// Post-node creation update is done only once to avoid infinite loop in case the node
// creation fails.
m_nodeCreationUpdateDone = true;
m_cameraUpdatePending = true;
update();
return;
}
#endif
}
GeometryBase::doUpdateGeometry();
QByteArray vertexData;
QByteArray indexData;
QVector3D minBounds;
QVector3D maxBounds;
fillVertexData(vertexData, indexData, minBounds, maxBounds);
addAttribute(QQuick3DGeometry::Attribute::IndexSemantic, 0,
QQuick3DGeometry::Attribute::U16Type);
setVertexData(vertexData);
setIndexData(indexData);
setBounds(minBounds, maxBounds);
}
void CameraGeometry::fillVertexData(QByteArray &vertexData, QByteArray &indexData,
QVector3D &minBounds, QVector3D &maxBounds)
{
const int vertexSize = int(sizeof(float)) * 8 * 3; // 8 vertices, 3 floats/vert
vertexData.resize(vertexSize);
const int indexSize = int(sizeof(quint16)) * 12 * 2; // 12 lines, 2 vert/line
indexData.resize(indexSize);
auto dataPtr = reinterpret_cast<float *>(vertexData.data());
auto indexPtr = reinterpret_cast<quint16 *>(indexData.data());
QMatrix4x4 m;
QSSGRenderCamera *camera = static_cast<QSSGRenderCamera *>(QQuick3DObjectPrivate::get(m_camera)->spatialNode);
if (camera) {
QRectF rect = m_viewPortRect;
if (rect.isNull())
rect = QRectF(0, 0, 1000, 1000); // Let's have some visualization for null viewports
camera->calculateGlobalVariables(rect);
m = camera->projection.inverted();
}
const QVector3D farTopLeft = m * QVector3D(1.f, -1.f, 1.f);
const QVector3D farBottomRight = m * QVector3D(-1.f, 1.f, 1.f);
const QVector3D nearTopLeft = m * QVector3D(1.f, -1.f, -1.f);
const QVector3D nearBottomRight = m * QVector3D(-1.f, 1.f, -1.f);
*dataPtr++ = nearTopLeft.x(); *dataPtr++ = nearBottomRight.y(); *dataPtr++ = nearTopLeft.z();
*dataPtr++ = nearTopLeft.x(); *dataPtr++ = nearTopLeft.y(); *dataPtr++ = nearTopLeft.z();
*dataPtr++ = nearBottomRight.x(); *dataPtr++ = nearTopLeft.y(); *dataPtr++ = nearTopLeft.z();
*dataPtr++ = nearBottomRight.x(); *dataPtr++ = nearBottomRight.y(); *dataPtr++ = nearTopLeft.z();
*dataPtr++ = farTopLeft.x(); *dataPtr++ = farBottomRight.y(); *dataPtr++ = farTopLeft.z();
*dataPtr++ = farTopLeft.x(); *dataPtr++ = farTopLeft.y(); *dataPtr++ = farTopLeft.z();
*dataPtr++ = farBottomRight.x(); *dataPtr++ = farTopLeft.y(); *dataPtr++ = farTopLeft.z();
*dataPtr++ = farBottomRight.x(); *dataPtr++ = farBottomRight.y(); *dataPtr++ = farTopLeft.z();
// near rect
*indexPtr++ = 0; *indexPtr++ = 1;
*indexPtr++ = 1; *indexPtr++ = 2;
*indexPtr++ = 2; *indexPtr++ = 3;
*indexPtr++ = 3; *indexPtr++ = 0;
// near to far
*indexPtr++ = 0; *indexPtr++ = 4;
*indexPtr++ = 1; *indexPtr++ = 5;
*indexPtr++ = 2; *indexPtr++ = 6;
*indexPtr++ = 3; *indexPtr++ = 7;
// far rect
*indexPtr++ = 4; *indexPtr++ = 5;
*indexPtr++ = 5; *indexPtr++ = 6;
*indexPtr++ = 6; *indexPtr++ = 7;
*indexPtr++ = 7; *indexPtr++ = 4;
static const float floatMin = std::numeric_limits<float>::lowest();
static const float floatMax = std::numeric_limits<float>::max();
auto vertexPtr = reinterpret_cast<QVector3D *>(vertexData.data());
minBounds = QVector3D(floatMax, floatMax, floatMax);
maxBounds = QVector3D(floatMin, floatMin, floatMin);
for (int i = 0; i < vertexSize / 12; ++i) {
minBounds[0] = qMin((*vertexPtr)[0], minBounds[0]);
minBounds[1] = qMin((*vertexPtr)[1], minBounds[1]);
minBounds[2] = qMin((*vertexPtr)[2], minBounds[2]);
maxBounds[0] = qMax((*vertexPtr)[0], maxBounds[0]);
maxBounds[1] = qMax((*vertexPtr)[1], maxBounds[1]);
maxBounds[2] = qMax((*vertexPtr)[2], maxBounds[2]);
++vertexPtr;
}
}
}
}
#endif // QUICK3D_MODULE
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