Fix an issue where the mixer lagging too much behind CEF would cause us to display...

[nageru] / main.cpp

diff --git a/main.cpp b/main.cpp
index 34a1c497a48497c39580ae8cb24b5bd910eb78fc..4287b7e56f8d4faf321f28221d432492ac54c1bd 100644 (file)
--- a/main.cpp
+++ b/main.cpp
@@ -1,16 +1,71 @@
+extern "C" {
+#include <libavformat/avformat.h>
+}
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/mman.h>
+#include <epoxy/gl.h>  // IWYU pragma: keep
 #include <QApplication>
-#include <QDesktopWidget>
+#include <QCoreApplication>
+#include <QGL>
+#include <QSize>
 #include <QSurfaceFormat>
-#include <QtGui/QOpenGLContext>
+#include <string>
+
+#ifdef HAVE_CEF
+#include <cef_app.h>
+#include <cef_browser.h>
+#include <cef_client.h>
+#include <cef_version.h>
+#endif
 
+#include "basic_stats.h"
+#ifdef HAVE_CEF
+#include "nageru_cef_app.h"
+#endif
+#include "context.h"
+#include "flags.h"
+#include "image_input.h"
 #include "mainwindow.h"
+#include "mixer.h"
+
+#ifdef HAVE_CEF
+CefRefPtr<NageruCefApp> cef_app;
+#endif
 
 int main(int argc, char *argv[])
 {
-       setenv("QT_XCB_GL_INTEGRATION", "xcb_egl", 0);
+#ifdef HAVE_CEF
+       // Let CEF have first priority on parsing the command line, because we might be
+       // launched as a CEF sub-process.
+       CefMainArgs main_args(argc, argv);
+       cef_app = CefRefPtr<NageruCefApp>(new NageruCefApp());
+       int err = CefExecuteProcess(main_args, cef_app.get(), nullptr);
+       if (err >= 0) {
+               return err;
+       }
+
+       // CEF wants to use GLib for its main loop, which interferes with Qt's use of it.
+       // The alternative is trying to integrate CEF into Qt's main loop, but that requires
+       // fairly extensive cross-thread communication and that parts of CEF runs on Qt's UI
+       // thread.
+       setenv("QT_NO_GLIB", "1", 0);
+#endif
+
+       parse_flags(PROGRAM_NAGERU, argc, argv);
+
+       if (global_flags.va_display.empty() ||
+           global_flags.va_display[0] != '/') {
+               // We normally use EGL for zerocopy, but if we use VA against DRM
+               // instead of against X11, we turn it off, and then don't need EGL.
+               setenv("QT_XCB_GL_INTEGRATION", "xcb_egl", 0);
+               using_egl = true;
+       }
+       setlinebuf(stdout);
+       av_register_all();
 
        QCoreApplication::setAttribute(Qt::AA_ShareOpenGLContexts, true);
-       QApplication app(argc, argv);
 
        QSurfaceFormat fmt;
        fmt.setDepthBufferSize(0);
@@ -18,11 +73,46 @@ int main(int argc, char *argv[])
        fmt.setProfile(QSurfaceFormat::CoreProfile);
        fmt.setMajorVersion(3);
        fmt.setMinorVersion(1);
+
+       // Turn off vsync, since Qt generally gives us at most frame rate
+       // (display frequency) / (number of QGLWidgets active).
+       fmt.setSwapInterval(0);
+
        QSurfaceFormat::setDefaultFormat(fmt);
 
+       QGLFormat::setDefaultFormat(QGLFormat::fromSurfaceFormat(fmt));
+
+       QApplication app(argc, argv);
+       global_share_widget = new QGLWidget();
+       if (!global_share_widget->isValid()) {
+               fprintf(stderr, "Failed to initialize OpenGL. Nageru needs at least OpenGL 3.1 to function properly.\n");
+               exit(1);
+       }
+
        MainWindow mainWindow;
-       mainWindow.resize(mainWindow.sizeHint());
+       mainWindow.resize(QSize(1500, 850));
        mainWindow.show();
 
-       return app.exec();
+       app.installEventFilter(&mainWindow);  // For white balance color picking.
+
+       // Even on an otherwise unloaded system, it would seem writing the recording
+       // to disk (potentially terabytes of data as time goes by) causes Nageru
+       // to be pushed out of RAM. If we have the right privileges, simply lock us
+       // into memory for better realtime behavior.
+       if (mlockall(MCL_CURRENT | MCL_FUTURE) == -1) {
+               perror("mlockall()");
+               fprintf(stderr, "Failed to lock Nageru into RAM. You probably want to\n");
+               fprintf(stderr, "increase \"memlock\" for your user in limits.conf\n");
+               fprintf(stderr, "for better realtime behavior.\n");
+               uses_mlock = false;
+       } else {
+               uses_mlock = true;
+       }
+
+       int rc = app.exec();
+       global_mixer->quit();
+       mainWindow.mixer_shutting_down();
+       delete global_mixer;
+       ImageInput::shutdown_updaters();
+       return rc;
 }