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// Copyright (C) 2025 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#include "qthreadlocalrhi_p.h"
#include <QtCore/qcoreapplication.h>
#include <QtCore/qthreadstorage.h>
#include <QtGui/private/qguiapplication_p.h>
#include <QtGui/qoffscreensurface.h>
#include <QtGui/qpa/qplatformintegration.h>
#if defined(Q_OS_ANDROID)
# include <QtCore/qmetaobject.h>
#endif
QT_BEGIN_NAMESPACE
namespace {
static thread_local QRhi::Implementation s_preferredBackend = QRhi::Null;
#if QT_CONFIG(opengl)
bool openGLCapsSupported(const QPlatformIntegration &qpa)
{
return qpa.hasCapability(QPlatformIntegration::OpenGL) &&
!QCoreApplication::testAttribute(Qt::AA_ForceRasterWidgets) &&
(QThread::isMainThread() ||
(qpa.hasCapability(QPlatformIntegration::ThreadedOpenGL) &&
qpa.hasCapability(QPlatformIntegration::OffscreenSurface)));
}
#endif
class ThreadLocalRhiHolder
{
public:
ThreadLocalRhiHolder();
~ThreadLocalRhiHolder() { resetRhi(); }
QRhi *ensureRhi(QRhi *referenceRhi)
{
if (m_rhi || m_cpuOnly)
return m_rhi.get();
[[maybe_unused]] QRhi::Implementation referenceBackend =
referenceRhi ? referenceRhi->backend() : QRhi::Null;
const QPlatformIntegration *qpa = QGuiApplicationPrivate::platformIntegration();
if (qpa && qpa->hasCapability(QPlatformIntegration::RhiBasedRendering)) {
#if QT_CONFIG(metal)
if (canUseRhiImpl(QRhi::Metal, referenceBackend)) {
QRhiMetalInitParams params;
m_rhi.reset(QRhi::create(QRhi::Metal, ¶ms));
}
#endif
#if defined(Q_OS_WIN)
if (!m_rhi && canUseRhiImpl(QRhi::D3D11, referenceBackend)) {
QRhiD3D11InitParams params;
m_rhi.reset(QRhi::create(QRhi::D3D11, ¶ms));
}
#endif
#if QT_CONFIG(opengl)
if (!m_rhi && canUseRhiImpl(QRhi::OpenGLES2, referenceBackend)) {
if (openGLCapsSupported(*qpa)) {
m_fallbackSurface.reset(QRhiGles2InitParams::newFallbackSurface());
QRhiGles2InitParams params;
params.fallbackSurface = m_fallbackSurface.get();
if (referenceBackend == QRhi::OpenGLES2)
params.shareContext = static_cast<const QRhiGles2NativeHandles *>(
referenceRhi->nativeHandles())
->context;
m_rhi.reset(QRhi::create(QRhi::OpenGLES2, ¶ms));
# if defined(Q_OS_ANDROID)
// reset RHI state on application suspension, as this will be invalid after
// resuming
if (!m_appStateChangedConnection) {
if (!m_eventsReceiver)
m_eventsReceiver = std::make_unique<QObject>();
auto onStateChanged = [this](auto state) {
if (state == Qt::ApplicationSuspended)
resetRhi();
};
m_appStateChangedConnection =
QObject::connect(qApp, &QGuiApplication::applicationStateChanged,
m_eventsReceiver.get(), onStateChanged);
}
# endif
}
}
#endif
}
if (!m_rhi) {
m_cpuOnly = true;
qWarning() << Q_FUNC_INFO << ": No RHI backend. Using CPU conversion.";
}
return m_rhi.get();
}
void resetRhi()
{
m_rhi.reset();
#if QT_CONFIG(opengl)
m_fallbackSurface.reset();
#endif
m_cpuOnly = false;
}
bool canUseRhiImpl(const QRhi::Implementation implementation,
const QRhi::Implementation reference)
{
// First priority goes to reference backend
if (reference != QRhi::Null)
return implementation == reference;
// If no reference, but preference exists, compare to that
if (s_preferredBackend != QRhi::Null)
return implementation == s_preferredBackend;
// Can use (assuming platform and configuration allow)
return true;
}
private:
std::unique_ptr<QRhi> m_rhi;
#if QT_CONFIG(opengl)
std::unique_ptr<QOffscreenSurface> m_fallbackSurface;
#endif
bool m_cpuOnly = false;
#if defined(Q_OS_ANDROID)
std::unique_ptr<QObject> m_eventsReceiver;
// we keep and check QMetaObject::Connection because the sender, qApp,
// can be recreated and the connection invalidated.
QMetaObject::Connection m_appStateChangedConnection;
#endif
};
Q_CONSTINIT thread_local std::optional<ThreadLocalRhiHolder> g_threadLocalRhiHolder;
ThreadLocalRhiHolder::ThreadLocalRhiHolder()
{
if (QThread::isMainThread()) {
// ensure cleanup in qApp dtor
qAddPostRoutine([] {
g_threadLocalRhiHolder.reset();
});
}
}
} // namespace
QRhi *qEnsureThreadLocalRhi(QRhi *referenceRhi)
{
if (!g_threadLocalRhiHolder)
g_threadLocalRhiHolder.emplace();
return g_threadLocalRhiHolder->ensureRhi(referenceRhi);
}
void qSetPreferredThreadLocalRhiBackend(QRhi::Implementation backend)
{
s_preferredBackend = backend;
if (g_threadLocalRhiHolder)
g_threadLocalRhiHolder->resetRhi();
}
QT_END_NAMESPACE
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