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| ** This file is part of the examples of the Qt Toolkit. |
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| |
| #include "mesh.h" |
| #include <QtConcurrentRun> |
| #include <QFile> |
| |
| void Mesh::load(const QString &fn) |
| { |
| reset(); |
| m_maybeRunning = true; |
| m_future = QtConcurrent::run([fn]() { |
| MeshData md; |
| QFile f(fn); |
| if (!f.open(QIODevice::ReadOnly)) { |
| qWarning("Failed to open %s", qPrintable(fn)); |
| return md; |
| } |
| QByteArray buf = f.readAll(); |
| const char *p = buf.constData(); |
| quint32 format; |
| memcpy(&format, p, 4); |
| if (format != 1) { |
| qWarning("Invalid format in %s", qPrintable(fn)); |
| return md; |
| } |
| int ofs = 4; |
| memcpy(&md.vertexCount, p + ofs, 4); |
| ofs += 4; |
| memcpy(md.aabb, p + ofs, 6 * 4); |
| ofs += 6 * 4; |
| const int byteCount = md.vertexCount * 8 * 4; |
| md.geom.resize(byteCount); |
| memcpy(md.geom.data(), p + ofs, byteCount); |
| return md; |
| }); |
| } |
| |
| MeshData *Mesh::data() |
| { |
| if (m_maybeRunning && !m_data.isValid()) |
| m_data = m_future.result(); |
| |
| return &m_data; |
| } |
| |
| void Mesh::reset() |
| { |
| *data() = MeshData(); |
| m_maybeRunning = false; |
| } |