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

[nageru] / context.cpp

diff --git a/context.cpp b/context.cpp
index 4ae85bdd95a7dc09f9abd4676d35fa078e894402..e181be7cecb644e39faa5071d61ebe9057a16190 100644 (file)
--- a/context.cpp
+++ b/context.cpp
@@ -1,31 +1,126 @@
+#include <glob.h>
 #include <stdio.h>
+extern "C" {
+#include <pci/pci.h>
+}
+
+#include <string>
 
 #include <QGL>
 #include <QOffscreenSurface>
 #include <QOpenGLContext>
+#include <QSurface>
 #include <QSurfaceFormat>
 
-class QSurface;
-
 QGLWidget *global_share_widget = nullptr;
+bool using_egl = false;
+
+using namespace std;
+
+namespace {
+
+string get_pci_device_name(const char *node_name)
+{
+       char vendor_path[256];
+       snprintf(vendor_path, sizeof(vendor_path), "/sys/class/drm/%s/device/vendor", node_name);
+       FILE *vendor_file = fopen(vendor_path, "r");
+       if (vendor_file == nullptr) {
+               return "could not look up vendor ID";
+       }
+       int vendor;
+       if (fscanf(vendor_file, "%i", &vendor) != 1) {
+               fclose(vendor_file);
+               return "could not parse vendor ID";
+       }
+       fclose(vendor_file);
+
+       char device_path[256];
+       snprintf(device_path, sizeof(device_path), "/sys/class/drm/%s/device/device", node_name);
+       FILE *device_file = fopen(device_path, "r");
+       if (device_file == nullptr) {
+               return "could not look up device ID";
+       }
+       int device;
+       if (fscanf(device_file, "%i", &device) != 1) {
+               fclose(device_file);
+               return "could not parse device ID";
+       }
+       fclose(device_file);
+
+       pci_access *pci = pci_alloc();
+       if (pci == nullptr) {
+               return "could not init libpci";
+       }
+       pci_init(pci);
+
+       char buf[256];
+       const char *name = pci_lookup_name(pci, buf, sizeof(buf), PCI_LOOKUP_VENDOR | PCI_LOOKUP_DEVICE, vendor, device);
+       pci_cleanup(pci);
+
+       if (name == nullptr) {
+               snprintf(buf, sizeof(buf), "%04x:%04x", vendor, device);
+       }
+       return buf;
+}
+
+void print_available_drm_nodes()
+{
+       glob_t g;
+       int err = glob("/dev/dri/renderD*", 0, nullptr, &g);  // TODO: Accept /dev/dri/card*, too?
+       if (err != 0) {
+               fprintf(stderr, "Couldn't list render nodes (%s).\n", strerror(errno));
+               return;
+       }
+
+       if (g.gl_pathc == 0) {
+               fprintf(stderr, "\n");
+               fprintf(stderr, "No render nodes found in /dev/dri.\n");
+       } else {
+               fprintf(stderr, "Available devices (these may or may not support VA-API encoding):\n\n");
+               for (size_t i = 0; i < g.gl_pathc; ++i) {
+                       const char *node_name = basename(g.gl_pathv[i]);
+                       fprintf(stderr, "  %s (%s)\n", g.gl_pathv[i], get_pci_device_name(node_name).c_str());
+               }
+       }
+
+       globfree(&g);
+}
+
+}  // namespace
 
 QSurface *create_surface(const QSurfaceFormat &format)
 {
        QOffscreenSurface *surface = new QOffscreenSurface;
        surface->setFormat(format);
-//     QWindow *surface = new QWindow;
        surface->create();
        if (!surface->isValid()) {
-               printf("ERROR: surface not valid!\n");
-//             abort();
+               fprintf(stderr, "ERROR: surface not valid!\n");
+               if (using_egl) {
+                       fprintf(stderr, "\n\n");
+                       fprintf(stderr, "OpenGL initialization failed. This is most likely because your driver does not\n");
+                       fprintf(stderr, "support EGL (e.g. NVIDIA drivers). You can turn off EGL by specifying the\n");
+                       fprintf(stderr, "VA-API path directly, assuming you have another GPU with VA-API support\n");
+                       fprintf(stderr, "(typically an integrated Intel GPU -- note that it you might need to manually\n");
+                       fprintf(stderr, "enable it in the BIOS, as it might be turned off when a discrete GPU is detected).\n");
+                       fprintf(stderr, "\n");
+                       fprintf(stderr, "Specify the VA-API device using “--va-display /dev/dri/<node>”.\n");
+                       print_available_drm_nodes();
+               }
+               exit(1);
        }
        return surface;
 }
 
-QOpenGLContext *create_context()
+QSurface *create_surface_with_same_format(const QSurface *surface)
+{
+       return create_surface(surface->format());
+}
+
+QOpenGLContext *create_context(const QSurface *surface)
 {
        QOpenGLContext *context = new QOpenGLContext;
        context->setShareContext(global_share_widget->context()->contextHandle());
+       context->setFormat(surface->format());
        context->create();
        return context;
 }
@@ -34,3 +129,8 @@ bool make_current(QOpenGLContext *context, QSurface *surface)
 {
        return context->makeCurrent(surface);
 }
+
+void delete_context(QOpenGLContext *context)
+{
+       delete context;
+}