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// Copyright (C) 2017 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 "updatelevelofdetailjob_p.h"
#include <Qt3DCore/private/qaspectmanager_p.h>
#include <Qt3DRender/QLevelOfDetail>
#include <Qt3DRender/private/entityvisitor_p.h>
#include <Qt3DRender/private/job_common_p.h>
#include <Qt3DRender/private/nodemanagers_p.h>
#include <Qt3DRender/private/managers_p.h>
#include <Qt3DRender/private/sphere_p.h>
#include <Qt3DRender/private/pickboundingvolumeutils_p.h>
QT_BEGIN_NAMESPACE
namespace
{
template <unsigned N>
double approxRollingAverage(double avg, double input) {
avg -= avg / N;
avg += input / N;
return avg;
}
class LODUpdateVisitor : public Qt3DRender::Render::EntityVisitor
{
public:
LODUpdateVisitor(double filterValue, Qt3DRender::Render::FrameGraphNode *frameGraphRoot, Qt3DRender::Render::NodeManagers *manager)
: Qt3DRender::Render::EntityVisitor(manager)
, m_filterValue(filterValue)
, m_frameGraphRoot(frameGraphRoot)
{
m_updatedIndices.reserve(manager->levelOfDetailManager()->count());
}
double filterValue() const { return m_filterValue; }
const QList<QPair<Qt3DCore::QNodeId, int>> &updatedIndices() const { return m_updatedIndices; }
Operation visit(Qt3DRender::Render::Entity *entity = nullptr) override {
using namespace Qt3DRender;
using namespace Qt3DRender::Render;
if (!entity->isEnabled())
return Prune; // skip disabled sub-trees, since their bounding box is probably not valid anyway
const std::vector<LevelOfDetail *> &lods = entity->renderComponents<LevelOfDetail>();
if (!lods.empty()) {
LevelOfDetail* lod = lods.front(); // other lods are ignored
if (lod->isEnabled() && !lod->thresholds().isEmpty()) {
switch (lod->thresholdType()) {
case QLevelOfDetail::DistanceToCameraThreshold:
updateEntityLodByDistance(entity, lod);
break;
case QLevelOfDetail::ProjectedScreenPixelSizeThreshold:
updateEntityLodByScreenArea(entity, lod);
break;
default:
Q_ASSERT(false);
break;
}
}
}
return Continue;
}
private:
double m_filterValue = 0.;
Qt3DRender::Render::FrameGraphNode *m_frameGraphRoot;
QList<QPair<Qt3DCore::QNodeId, int>> m_updatedIndices;
void updateEntityLodByDistance(Qt3DRender::Render::Entity *entity, Qt3DRender::Render::LevelOfDetail *lod)
{
using namespace Qt3DRender;
using namespace Qt3DRender::Render;
Matrix4x4 viewMatrix;
Matrix4x4 projectionMatrix;
if (!Render::CameraLens::viewMatrixForCamera(m_manager->renderNodesManager(), lod->camera(), viewMatrix, projectionMatrix))
return;
const QList<qreal> thresholds = lod->thresholds();
Vector3D center(lod->center());
if (lod->hasBoundingVolumeOverride() || entity->worldBoundingVolume() == nullptr) {
center = entity->worldTransform()->map(center);
} else {
center = entity->worldBoundingVolume()->center();
}
const Vector3D tcenter = viewMatrix.map(center);
const double dist = double(tcenter.length());
const qsizetype n = thresholds.size();
for (qsizetype i = 0; i < n; ++i) {
if (dist <= thresholds[i] || i == n -1) {
m_filterValue = approxRollingAverage<30>(m_filterValue, i);
i = qBound(0, static_cast<int>(qRound(m_filterValue)), n - 1);
if (lod->currentIndex() != i) {
lod->setCurrentIndex(i);
m_updatedIndices.push_back({lod->peerId(), i});
}
break;
}
}
}
void updateEntityLodByScreenArea(Qt3DRender::Render::Entity *entity, Qt3DRender::Render::LevelOfDetail *lod)
{
using namespace Qt3DRender;
using namespace Qt3DRender::Render;
Matrix4x4 viewMatrix;
Matrix4x4 projectionMatrix;
if (!Render::CameraLens::viewMatrixForCamera(m_manager->renderNodesManager(), lod->camera(), viewMatrix, projectionMatrix))
return;
PickingUtils::ViewportCameraAreaGatherer vcaGatherer(lod->camera());
const std::vector<PickingUtils::ViewportCameraAreaDetails> &vcaTriplets = vcaGatherer.gather(m_frameGraphRoot);
if (vcaTriplets.empty())
return;
const PickingUtils::ViewportCameraAreaDetails &vca = vcaTriplets.front();
const QList<qreal> thresholds = lod->thresholds();
Sphere bv(Vector3D(lod->center()), lod->radius());
if (!lod->hasBoundingVolumeOverride() && entity->worldBoundingVolume() != nullptr) {
bv = *(entity->worldBoundingVolume());
} else {
bv.transform(*entity->worldTransform());
}
bv.transform(projectionMatrix * viewMatrix);
const float sideLength = bv.radius() * 2.f;
float area = vca.viewport.width() * sideLength * vca.viewport.height() * sideLength;
const QRect r = windowViewport(vca.area, vca.viewport);
area = std::sqrt(area * float(r.width()) * float(r.height()));
const qsizetype n = thresholds.size();
for (qsizetype i = 0; i < n; ++i) {
if (thresholds[i] < area || i == n -1) {
m_filterValue = approxRollingAverage<30>(m_filterValue, i);
i = qBound(0, static_cast<int>(qRound(m_filterValue)), n - 1);
if (lod->currentIndex() != i) {
lod->setCurrentIndex(i);
m_updatedIndices.push_back({lod->peerId(), i});
}
break;
}
}
}
QRect windowViewport(const QSize &area, const QRectF &relativeViewport) const
{
if (area.isValid()) {
const int areaWidth = area.width();
const int areaHeight = area.height();
return QRect(relativeViewport.x() * areaWidth,
(1.0 - relativeViewport.y() - relativeViewport.height()) * areaHeight,
relativeViewport.width() * areaWidth,
relativeViewport.height() * areaHeight);
}
return relativeViewport.toRect();
}
};
}
namespace Qt3DRender {
namespace Render {
class UpdateLevelOfDetailJobPrivate : public Qt3DCore::QAspectJobPrivate
{
public:
UpdateLevelOfDetailJobPrivate(UpdateLevelOfDetailJob *q) : q_ptr(q) { }
bool isRequired() const override;
void postFrame(Qt3DCore::QAspectManager *manager) override;
QList<QPair<Qt3DCore::QNodeId, int>> m_updatedIndices;
UpdateLevelOfDetailJob *q_ptr;
Q_DECLARE_PUBLIC(UpdateLevelOfDetailJob)
};
UpdateLevelOfDetailJob::UpdateLevelOfDetailJob()
: Qt3DCore::QAspectJob(*new UpdateLevelOfDetailJobPrivate(this))
, m_manager(nullptr)
, m_frameGraphRoot(nullptr)
, m_root(nullptr)
, m_filterValue(0.)
{
SET_JOB_RUN_STAT_TYPE(this, JobTypes::UpdateLevelOfDetail, 0)
}
UpdateLevelOfDetailJob::~UpdateLevelOfDetailJob()
{
}
void UpdateLevelOfDetailJob::setRoot(Entity *root)
{
m_root = root;
}
void UpdateLevelOfDetailJob::setManagers(NodeManagers *manager)
{
m_manager = manager;
}
void UpdateLevelOfDetailJob::setFrameGraphRoot(FrameGraphNode *frameGraphRoot)
{
m_frameGraphRoot = frameGraphRoot;
}
void UpdateLevelOfDetailJob::run()
{
Q_D(UpdateLevelOfDetailJob);
Q_ASSERT(m_frameGraphRoot && m_root && m_manager);
// short-circuit if no LoDs exist
if (m_manager->levelOfDetailManager()->count() == 0)
return;
LODUpdateVisitor visitor(m_filterValue, m_frameGraphRoot, m_manager);
visitor.apply(m_root);
m_filterValue = visitor.filterValue();
d->m_updatedIndices = visitor.updatedIndices();
}
bool UpdateLevelOfDetailJobPrivate::isRequired() const
{
Q_Q(const UpdateLevelOfDetailJob);
return q->m_manager->levelOfDetailManager()->count() > 0;
}
void UpdateLevelOfDetailJobPrivate::postFrame(Qt3DCore::QAspectManager *manager)
{
for (const auto &updatedNode: std::as_const(m_updatedIndices)) {
QLevelOfDetail *node = qobject_cast<QLevelOfDetail *>(manager->lookupNode(updatedNode.first));
if (!node)
continue;
node->setCurrentIndex(updatedNode.second);
}
}
} // Render
} // Qt3DRender
QT_END_NAMESPACE
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