+static const __DRIextension *image_loader_extensions[] = {
+ &image_loader_extension.base,
+ &image_lookup_extension.base,
+ &use_invalidate.base,
+ NULL,
+};
+
+static const __DRIextension *swrast_loader_extensions[] = {
+ &swrast_pbuffer_loader_extension.base,
+ &image_loader_extension.base,
+ &image_lookup_extension.base,
+ &use_invalidate.base,
+ NULL,
+};
+
+static bool
+surfaceless_probe_device(_EGLDisplay *disp, bool swrast)
+{
+#define MAX_DRM_DEVICES 64
+ const unsigned node_type = swrast ? DRM_NODE_PRIMARY : DRM_NODE_RENDER;
+ struct dri2_egl_display *dri2_dpy = disp->DriverData;
+ drmDevicePtr device, devices[MAX_DRM_DEVICES] = { NULL };
+ int i, num_devices;
+
+ num_devices = drmGetDevices2(0, devices, ARRAY_SIZE(devices));
+ if (num_devices < 0)
+ return false;
+
+ for (i = 0; i < num_devices; ++i) {
+ device = devices[i];
+
+ if (!(device->available_nodes & (1 << node_type)))
+ continue;
+
+ dri2_dpy->fd = loader_open_device(device->nodes[node_type]);
+ if (dri2_dpy->fd < 0)
+ continue;
+
+ disp->Device = _eglAddDevice(dri2_dpy->fd, swrast);
+ if (!disp->Device) {
+ close(dri2_dpy->fd);
+ dri2_dpy->fd = -1;
+ continue;
+ }
+
+ char *driver_name = loader_get_driver_for_fd(dri2_dpy->fd);
+ if (swrast) {
+ /* Use kms swrast only with vgem / virtio_gpu.
+ * virtio-gpu fallbacks to software rendering when 3D features
+ * are unavailable since 6c5ab, and kms_swrast is more
+ * feature complete than swrast.
+ */
+ if (driver_name &&
+ (strcmp(driver_name, "vgem") == 0 ||
+ strcmp(driver_name, "virtio_gpu") == 0))
+ dri2_dpy->driver_name = strdup("kms_swrast");
+ free(driver_name);
+ } else {
+ /* Use the given hardware driver */
+ dri2_dpy->driver_name = driver_name;
+ }
+
+ if (dri2_dpy->driver_name && dri2_load_driver_dri3(disp))
+ break;
+
+ free(dri2_dpy->driver_name);
+ dri2_dpy->driver_name = NULL;
+ close(dri2_dpy->fd);
+ dri2_dpy->fd = -1;
+ }
+ drmFreeDevices(devices, num_devices);
+
+ if (i == num_devices)
+ return false;
+
+ if (swrast)
+ dri2_dpy->loader_extensions = swrast_loader_extensions;
+ else
+ dri2_dpy->loader_extensions = image_loader_extensions;
+
+ return true;
+}
+
+static bool
+surfaceless_probe_device_sw(_EGLDisplay *disp)
+{
+ struct dri2_egl_display *dri2_dpy = disp->DriverData;
+
+ dri2_dpy->fd = -1;
+ disp->Device = _eglAddDevice(dri2_dpy->fd, true);
+ assert(disp->Device);
+
+ dri2_dpy->driver_name = strdup("swrast");
+ if (!dri2_dpy->driver_name)
+ return false;
+
+ if (!dri2_load_driver_swrast(disp)) {
+ free(dri2_dpy->driver_name);
+ dri2_dpy->driver_name = NULL;
+ return false;
+ }
+
+ dri2_dpy->loader_extensions = swrast_loader_extensions;
+ return true;
+}