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You're right - the code uses a more complex setup with memfd and dmabuf file descriptors. Let's modify just the UDMABUF_CREATE part while keeping the existing memory handling:
cCopy// Replace this section
struct udmabuf_create udmabuf_create = {
    .memfd = memfd,
    .flags = UDMABUF_FLAGS_CLOEXEC,
    .offset = 0,
    .size = size,
};
int dmabuf_fd = ioctl(allocator->fd, UDMABUF_CREATE, &udmabuf_create);

// With direct udmabuf open
int dmabuf_fd = open("/dev/udmabuf0", O_RDWR | O_CLOEXEC);
if (dmabuf_fd < 0) {
    wlr_log_errno(WLR_ERROR, "Failed to open udmabuf device");
    goto err_memfd;
}