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Sync rhi backingstore prefer-software env.var with Quick

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Behaving differently in QQuickWindow vs. a QRhi-based widget
window is not great for WebEngine. The env.var naming is not
the best (QSG prefix) but we already have some precedent for
this (recognizing QSG_INFO in QRhi), and there is no other
choice anyway.

Pick-to: 6.6 6.5 6.6.0 6.5.3
Task-number: QTBUG-116445
Change-Id: Ibfd495cbd1d42502441d6629325bdeb033e813f3
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>
This commit is contained in:
Laszlo Agocs 2023-09-14 15:56:08 +02:00
parent 12d6fc5229
commit ffb857e9d0
1 changed files with 5 additions and 0 deletions
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5
src/gui/painting/qbackingstorerhisupport.cpp
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@ -56,6 +56,11 @@ bool QBackingStoreRhiSupport::create()
QOffscreenSurface *surface = nullptr; QOffscreenSurface *surface = nullptr;
QRhi::Flags flags; QRhi::Flags flags;
// This must be the same env.var. Qt Quick uses, to ensure symmetry in the
// behavior between a QQuickWindow and a (QRhi-based) widget top-level window.
if (qEnvironmentVariableIntValue("QSG_RHI_PREFER_SOFTWARE_RENDERER"))
flags |= QRhi::PreferSoftwareRenderer;
if (m_config.api() == QPlatformBackingStoreRhiConfig::Null) { if (m_config.api() == QPlatformBackingStoreRhiConfig::Null) {
QRhiNullInitParams params; QRhiNullInitParams params;
rhi = QRhi::create(QRhi::Null, &params, flags); rhi = QRhi::create(QRhi::Null, &params, flags);