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Add workaround for broken Qt EGLFS card selection logic

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Cameron Gutman
2024-04-06 14:35:34 -05:00
parent f8c5d3c0ce
commit 011feab6ce
3 changed files with 67 additions and 1 deletions
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19
app/main.cpp
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@@ -10,7 +10,7 @@
#include <QFont>
#include <QCursor>
#include <QElapsedTimer>
#include <QFile>
#include <QTemporaryFile>
// Don't let SDL hook our main function, since Qt is already
// doing the same thing. This needs to be before any headers
@@ -351,6 +351,11 @@ int main(int argc, char *argv[])
SSL_free(nullptr);
#endif
// We keep this at function scope to ensure it stays around while we're running,
// becaue the Qt QPA will need to read it. Since the temporary file is only
// created when open() is called, this doesn't do any harm for other platforms.
QTemporaryFile eglfsConfigFile("eglfs_override_XXXXXX.conf");
// Avoid using High DPI on EGLFS. It breaks font rendering.
// https://bugreports.qt.io/browse/QTBUG-64377
//
@@ -372,6 +377,7 @@ int main(int argc, char *argv[])
if (!qEnvironmentVariableIsSet("QT_QPA_PLATFORM")) {
qInfo() << "Unable to detect Wayland or X11, so EGLFS will be used by default. Set QT_QPA_PLATFORM to override this.";
qputenv("QT_QPA_PLATFORM", "eglfs");
qputenv("SDL_VIDEODRIVER", "kmsdrm");
if (!qEnvironmentVariableIsSet("QT_QPA_EGLFS_ALWAYS_SET_MODE")) {
qInfo() << "Setting display mode by default. Set QT_QPA_EGLFS_ALWAYS_SET_MODE=0 to override this.";
@@ -384,6 +390,17 @@ int main(int argc, char *argv[])
qWarning() << "Unable to find a KMSDRM display device!";
qWarning() << "On the Raspberry Pi, you must enable the 'fake KMS' driver in raspi-config to use Moonlight outside of the GUI environment.";
}
else if (!qEnvironmentVariableIsSet("QT_QPA_EGLFS_KMS_CONFIG")) {
// HACK: Remove this when Qt is fixed to properly check for display support before picking a card
QString cardOverride = WMUtils::getDrmCardOverride();
if (!cardOverride.isEmpty()) {
if (eglfsConfigFile.open()) {
qInfo() << "Overriding default Qt EGLFS card selection to" << cardOverride;
QTextStream(&eglfsConfigFile) << "{ \"device\": \"" << cardOverride << "\" }";
qputenv("QT_QPA_EGLFS_KMS_CONFIG", eglfsConfigFile.fileName().toUtf8());
}
}
}
}
// EGLFS uses OpenGLES 2.0, so we will too. Some embedded platforms may not