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// Copyright (C) 2025 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
#include "lightmapmesh.h"
#include <QBuffer>
#include <private/qssgmesh_p.h>
#include <private/qssglightmapio_p.h>
LightmapMesh::LightmapMesh(QQuick3DObject *parent) : QQuick3DGeometry(parent) { }
LightmapMesh::~LightmapMesh() = default;
void LightmapMesh::updateData()
{
if (!m_source.isValid() || m_key.isEmpty())
return;
if (m_currentlyLoadedSource == m_source && m_currentlyLoadedKey == m_key)
return;
auto loader = QSSGLightmapLoader::open(m_source.toLocalFile());
if (!loader) {
qWarning("Failed to open lightmap source file");
return;
}
const auto keys = loader->getKeys();
const bool isMeshKey = keys.contains(std::make_pair(m_key, QSSGLightmapIODataTag::Mesh));
if (!isMeshKey) {
return;
}
QByteArray meshData = loader->readData(m_key, QSSGLightmapIODataTag::Mesh);
if (meshData.isEmpty())
return;
QBuffer buffer(&meshData);
buffer.open(QIODevice::ReadOnly);
const QSSGMesh::Mesh mesh = QSSGMesh::Mesh::loadMesh(&buffer, 1);
if (!mesh.isValid()) {
qWarning("Mesh load failed");
return;
}
if (!mesh.hasLightmapUVChannel()) {
qWarning("Mesh does not have lightmap UVs");
return;
}
clear();
const auto &vb = mesh.vertexBuffer();
const auto &ib = mesh.indexBuffer();
setVertexData(vb.data);
setIndexData(ib.data);
setStride(vb.stride);
setPrimitiveType(QQuick3DGeometry::PrimitiveType::Triangles);
auto findEntry = [&](const QByteArray &name) -> const QSSGMesh::Mesh::VertexBufferEntry * {
for (const auto &e : vb.entries)
if (e.name == name)
return &e;
return nullptr;
};
const QByteArray posName = QSSGMesh::MeshInternal::getPositionAttrName();
const QByteArray lmuvName = QSSGMesh::MeshInternal::getLightmapUVAttrName();
const auto *pos = findEntry(posName);
const auto *lmuv = findEntry(lmuvName);
if (!pos) {
qWarning("Position attribute not found");
return;
}
if (!lmuv) {
qWarning("Lightmap UV attribute not found");
return;
}
addAttribute(QQuick3DGeometry::Attribute::PositionSemantic, pos->offset, Attribute::ComponentType::F32Type);
addAttribute(QQuick3DGeometry::Attribute::TexCoord0Semantic, lmuv->offset, Attribute::ComponentType::F32Type);
Attribute::ComponentType ibCompType;
switch (ib.componentType) {
case QSSGRenderComponentType::UnsignedInt16:
ibCompType = Attribute::ComponentType::U16Type;
break;
case QSSGRenderComponentType::UnsignedInt32:
ibCompType = Attribute::ComponentType::U32Type;
break;
case QSSGRenderComponentType::Int32:
ibCompType = Attribute::ComponentType::I32Type;
break;
case QSSGRenderComponentType::Float32:
ibCompType = Attribute::ComponentType::F32Type;
break;
default:
ibCompType = Attribute::ComponentType::U32Type;
}
addAttribute(QQuick3DGeometry::Attribute::IndexSemantic, 0, ibCompType);
m_bounds.bounds.minimum = QVector3D(std::numeric_limits<float>::max(),
std::numeric_limits<float>::max(),
std::numeric_limits<float>::max());
m_bounds.bounds.maximum = QVector3D(-std::numeric_limits<float>::max(),
-std::numeric_limits<float>::max(),
-std::numeric_limits<float>::max());
for (const auto &subset : mesh.subsets()) {
m_bounds.bounds.minimum = QSSGUtils::vec3::minimum(m_bounds.bounds.minimum, subset.bounds.min);
m_bounds.bounds.maximum = QSSGUtils::vec3::maximum(m_bounds.bounds.maximum, subset.bounds.max);
}
setBounds(m_bounds.bounds.minimum, m_bounds.bounds.maximum);
m_currentlyLoadedSource = m_source;
m_currentlyLoadedKey = m_key;
update();
emit boundsChanged();
}
QUrl LightmapMesh::source() const
{
return m_source;
}
void LightmapMesh::setSource(const QUrl &newSource)
{
if (m_source == newSource)
return;
m_source = newSource;
updateData();
emit sourceChanged();
}
QString LightmapMesh::key() const
{
return m_key;
}
void LightmapMesh::setKey(const QString &newKey)
{
if (m_key == newKey)
return;
m_key = newKey;
updateData();
emit keyChanged();
}
const QQuick3DBounds3 &LightmapMesh::bounds() const
{
return m_bounds;
}
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