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rhi: Fix intro doc snippet with Vulkan

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The QVulkanInstance must outlive the QRhi (if Vulkan is used).
Otherwise subtle problems may pop up upon application exit.

Change-Id: Ia7074c7f53633d51cf3bbdcc84e7f578214d9648
Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>
(cherry picked from commit 1d019de6b7090ea6c973f7e9fa780259a455ce98)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
This commit is contained in:
Laszlo Agocs 2023-10-04 21:45:32 +02:00 committed by Qt Cherry-pick Bot
parent 666a1db34c
commit 2d87d42040
1 changed files with 3 additions and 1 deletions
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4
src/gui/doc/snippets/rhioffscreen/main.cpp
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@ -11,6 +11,9 @@ int main(int argc, char **argv)
{
QGuiApplication app(argc, argv);
#if QT_CONFIG(vulkan)
QVulkanInstance inst;
#endif
std::unique_ptr<QRhi> rhi;
#if defined(Q_OS_WIN)
QRhiD3D12InitParams params;
@ -19,7 +22,6 @@ int main(int argc, char **argv)
QRhiMetalInitParams params;
rhi.reset(QRhi::create(QRhi::Metal, &params));
#elif QT_CONFIG(vulkan)
QVulkanInstance inst;
inst.setExtensions(QRhiVulkanInitParams::preferredInstanceExtensions());
if (inst.create()) {
QRhiVulkanInitParams params;