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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 "lightmapviewerhelpers.h"
#include <QtQuick3DRuntimeRender/private/qssglightmapio_p.h>
#include <QRgb>
#include <QVector>
#include <QImage>
#include <QFile>
#include <QJsonObject>
#include <QDir>
static QRgb numberToBBGRColor(quint32 i, quint32 N, bool useAlpha)
{
if (i < 1 || i > N) {
return qRgba(0, 0, 0, useAlpha ? 0 : 0xff);
}
int range = N - 1; // exclude 0
double t = static_cast<double>(i - 1) / range;
quint8 r = 0, g = 0, b = 0;
if (t < 0.5) {
// Blue -> Green
double t2 = t / 0.5; // normalize 0..1
g = 255 * t2;
b = 255 * (1.0 - t2);
} else {
// Green -> Red
double t2 = (t - 0.5) / 0.5;
r = 255 * t2;
g = 255 * (1.0 - t2);
}
return qRgba(r, g, b, 0xff);
}
void LightmapViewerHelpers::maskToBBGRColor(QByteArray &array, bool useAlpha)
{
QVector<quint32> uints;
uints.resize(array.size() / sizeof(quint32));
memcpy(uints.data(), array.data(), array.size());
quint32 maxN = 0;
for (quint32 v : uints) {
maxN = qMax(maxN, v);
}
for (quint32 &vRef : uints) {
vRef = numberToBBGRColor(vRef, maxN, useAlpha);
}
memcpy(array.data(), uints.data(), array.size());
}
bool LightmapViewerHelpers::processLightmap(const QString &filename, bool print, bool extract)
{
bool success = true;
QSharedPointer<QSSGLightmapLoader> loader = QSSGLightmapLoader::open(filename);
if (!loader) {
return false;
}
if (QDir dir; !dir.exists("meshes") && (!dir.mkpath("meshes") || !dir.mkpath("images"))) {
qInfo() << "Failed to create folders";
return false;
}
int numImagesSaved = 0;
int numMeshesSaved = 0;
QList<QString> keys = loader->getKeys();
if (print)
qInfo() << "-- Keys --";
QVector<QString> baseKeys;
QVector<QString> meshKeys;
for (const QString &key : std::as_const(keys)) {
if (print)
qInfo() << key;
if (key.endsWith(QByteArrayLiteral("_metadata"))) {
baseKeys.push_back(key.chopped(9));
} else if (key.startsWith(QByteArrayLiteral("_mesh"))) {
meshKeys.push_back(key);
}
}
if (print)
qInfo() << "-- Values --";
// Extract meshes
if (extract) {
for (const QString &key : meshKeys) {
const QByteArray meshData = loader->readData(key);
QFile meshFile(QString("meshes/" + key + ".mesh"));
if (meshFile.open(QFile::WriteOnly)) {
meshFile.write(meshData);
meshFile.close();
++numMeshesSaved;
} else {
success = false;
qInfo() << key << "->" << "FAILED TO WRITE";
}
}
}
for (const QString &key : baseKeys) {
const QString key_metadata = key + QStringLiteral("_metadata");
const QString key_mask = key + QStringLiteral("_mask");
const QString key_direct = key + QStringLiteral("_direct");
const QString key_indirect = key + QStringLiteral("_indirect");
const QString key_final = key + QStringLiteral("_final");
int width = 0;
int height = 0;
if (keys.contains(key_metadata)) {
QVariantMap map = loader->readMetadata(key);
if (print) {
qInfo() << key_metadata << ":";
qInfo().noquote() << QJsonDocument(QJsonObject::fromVariantMap(map)).toJson(QJsonDocument::Indented).trimmed();
}
width = map[QStringLiteral("width")].toInt();
height = map[QStringLiteral("height")].toInt();
} else {
success = false;
qInfo() << key << ": expected metadata key, skipping.";
continue;
}
if (extract) {
if (keys.contains(key_mask)) {
QByteArray data = loader->readU32Image(key_mask);
maskToBBGRColor(data);
QImage img = QImage(reinterpret_cast<uchar *>(data.data()), width, height, QImage::Format_RGBA8888);
img.save(QString("images/" + key_mask + ".png"));
++numImagesSaved;
}
for (const QString &imageKey : { key_direct, key_indirect, key_final }) {
if (keys.contains(imageKey)) {
QByteArray data = loader->readF32Image(imageKey);
QImage img = QImage(reinterpret_cast<uchar *>(data.data()), width, height, QImage::Format_RGBA32FPx4);
img.save(QString("images/" + imageKey + ".png"));
++numImagesSaved;
}
}
}
}
if (extract) {
qInfo() << "Saved" << numImagesSaved << "images to 'images' and " << numMeshesSaved << "meshes to 'meshes'";
}
return success;
}
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