mesh.cpp Example File

hellovulkancubes/mesh.cpp
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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; }