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++ // Copyright (C) 2023 The Qt Company Ltd.
++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
++
++ #include "datasource.h"
++ #include <QtCore/qmath.h>
++ #include <QtGui/QRgb>
++ #include <QtGui/QVector3D>
++
++ Q_DECLARE_METATYPE(QCustom3DVolume *)
++
++ DataSource::DataSource(QObject *parent) :
++ QObject(parent)
++ {
++ qRegisterMetaType<QCustom3DVolume *>();
++ }
++
++ DataSource::~DataSource()
++ {
++ }
++
++ void DataSource::fillVolume(QCustom3DVolume *volumeItem)
++ {
++ // Generate example texture data for an half-ellipsoid with a section missing.
++ // This can take a while if the dimensions are large, so we support incremental data generation.
++
++ int index = 0;
++ int textureSize = 256;
++ QVector3D midPoint(float(textureSize) / 2.0f,
++ float(textureSize) / 2.0f,
++ float(textureSize) / 2.0f);
++
++ QList<uchar> *textureData = new QList<uchar>(textureSize * textureSize * textureSize / 2);
++ for (int i = 0; i < textureSize; i++) {
++ for (int j = 0; j < textureSize / 2; j++) {
++ for (int k = 0; k < textureSize; k++) {
++ int colorIndex = 0;
++ // Take a section out of the ellipsoid
++ if (i >= textureSize / 2 || j >= textureSize / 4 || k >= textureSize / 2) {
++ QVector3D distVec = QVector3D(float(k), float(j * 2), float(i)) - midPoint;
++ float adjLen = qMin(255.0f, (distVec.length() * 512.0f / float(textureSize)));
++ colorIndex = 255 - int(adjLen);
++ }
++
++ (*textureData)[index] = colorIndex;
++ index++;
++ }
++ }
++ }
++
++ volumeItem->setScaling(QVector3D(2.0f, 1.0f, 2.0f));
++ volumeItem->setTextureWidth(textureSize);
++ volumeItem->setTextureHeight(textureSize / 2);
++ volumeItem->setTextureDepth(textureSize);
++ volumeItem->setTextureFormat(QImage::Format_Indexed8);
++ volumeItem->setTextureData(textureData);
++
++ QList<QRgb> colorTable(256);
++
++ for (int i = 1; i < 256; i++) {
++ if (i < 15)
++ colorTable[i] = qRgba(0, 0, 0, 0);
++ else if (i < 60)
++ colorTable[i] = qRgba((i * 2) + 120, 0, 0, 15);
++ else if (i < 120)
++ colorTable[i] = qRgba(0, ((i - 60) * 2) + 120, 0, 50);
++ else if (i < 180)
++ colorTable[i] = qRgba(0, 0, ((i - 120) * 2) + 120, 255);
++ else
++ colorTable[i] = qRgba(i, i, i, 255);
++ }
++
++ volumeItem->setColorTable(colorTable);
++ }