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50
51#include "mesh.h"
52#include <QtConcurrentRun>
53#include <QFile>
54
55void Mesh::load(const QString &fn)
56{
57 reset();
58 m_maybeRunning = true;
59 m_future = QtConcurrent::run(functor: [fn]() {
60 MeshData md;
61 QFile f(fn);
62 if (!f.open(flags: QIODevice::ReadOnly)) {
63 qWarning(msg: "Failed to open %s", qPrintable(fn));
64 return md;
65 }
66 QByteArray buf = f.readAll();
67 const char *p = buf.constData();
68 quint32 format;
69 memcpy(dest: &format, src: p, n: 4);
70 if (format != 1) {
71 qWarning(msg: "Invalid format in %s", qPrintable(fn));
72 return md;
73 }
74 int ofs = 4;
75 memcpy(dest: &md.vertexCount, src: p + ofs, n: 4);
76 ofs += 4;
77 memcpy(dest: md.aabb, src: p + ofs, n: 6 * 4);
78 ofs += 6 * 4;
79 const int byteCount = md.vertexCount * 8 * 4;
80 md.geom.resize(size: byteCount);
81 memcpy(dest: md.geom.data(), src: p + ofs, n: byteCount);
82 return md;
83 });
84}
85
86MeshData *Mesh::data()
87{
88 if (m_maybeRunning && !m_data.isValid())
89 m_data = m_future.result();
90
91 return &m_data;
92}
93
94void Mesh::reset()
95{
96 *data() = MeshData();
97 m_maybeRunning = false;
98}
99

source code of qtbase/examples/vulkan/hellovulkancubes/mesh.cpp