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// SPDX-License-Identifier: BSD-3-Clause
/*
* xshm_pub.c - capture an X11 screen and publish frames into the kvmfr
* ivshmem BAR so the host can display them (the Looking-Glass-style path:
* the guest renders with its real graphics stack - X on the passed GPU /
* GLX / Vulkan surface - and this tool copies the framebuffer into the
* shared BAR; the host reader decodes it).
*
* Layout in the BAR (same as tools/cuda-ab/frame_producer.cu):
* offset 0x100000: struct frame_hdr { magic, version, width, height,
* stride, format, seq } then width*height*4 RGBA8 bytes.
*
* Usage (guest, with DISPLAY set):
* ./xshm_pub [frames] [fps] [x] [y] [w] [h]
* Prints FRAME lines (first 5 and every 30th) then FRAME_DONE.
* Build (host, same glibc): gcc -O2 -o xshm_pub xshm_pub.c -lX11 -lXext
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <time.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/extensions/XShm.h>
#include <sys/ipc.h>
#include <sys/shm.h>
#define FRAME_OFFSET 0x100000UL
#define HDR_MAGIC 0x4b564d46u /* "FMVK" */
struct frame_hdr {
uint32_t magic;
uint32_t version;
uint32_t width;
uint32_t height;
uint32_t stride;
uint32_t format; /* 0 = RGBA8 */
uint32_t seq;
uint32_t reserved;
uint64_t timestamp_ns;
};
static uint64_t now_ns(void)
{
struct timespec ts;
clock_gettime(CLOCK_MONOTONIC, &ts);
return (uint64_t)ts.tv_sec * 1000000000ull + ts.tv_nsec;
}
int main(int argc, char **argv)
{
int frames = argc > 1 ? atoi(argv[1]) : 120;
int fps = argc > 2 ? atoi(argv[2]) : 10;
int gx = argc > 3 ? atoi(argv[3]) : 0;
int gy = argc > 4 ? atoi(argv[4]) : 0;
int gw = argc > 5 ? atoi(argv[5]) : 0;
int gh = argc > 6 ? atoi(argv[6]) : 0;
const char *bar_path =
"/sys/bus/pci/devices/0000:00:03.0/resource2";
Display *dpy;
Window root;
XImage *img = NULL;
XShmSegmentInfo shm;
int use_shm = 1, fd, i, w, h;
unsigned char *bar;
struct frame_hdr *hdr;
volatile uint32_t *seqp;
uint64_t t_first = 0;
uint64_t t_last = 0;
setvbuf(stdout, NULL, _IONBF, 0);
dpy = XOpenDisplay(NULL);
if (!dpy) {
printf("XOPEN_FAIL DISPLAY=%s\n",
getenv("DISPLAY") ? getenv("DISPLAY") : "(unset)");
return 1;
}
root = DefaultRootWindow(dpy);
{
XWindowAttributes wa;
XGetWindowAttributes(dpy, root, &wa);
w = gw > 0 ? gw : wa.width;
h = gh > 0 ? gh : wa.height;
printf("XSCREEN %dx%d root=%dx%d\n", w, h, wa.width,
wa.height);
}
fd = open(bar_path, O_RDWR | O_SYNC);
if (fd < 0) {
printf("OPEN_FAIL %s\n", bar_path);
return 1;
}
bar = (unsigned char *)mmap(NULL, 128UL << 20, PROT_READ | PROT_WRITE,
MAP_SHARED, fd, 0);
if (bar == MAP_FAILED) {
printf("MMAP_FAIL\n");
return 1;
}
hdr = (struct frame_hdr *)(bar + FRAME_OFFSET);
seqp = &hdr->seq;
memset(&shm, 0, sizeof(shm));
if (use_shm) {
img = XShmCreateImage(dpy, DefaultVisual(dpy,
DefaultScreen(dpy)),
DefaultDepth(dpy, DefaultScreen(dpy)),
ZPixmap, NULL, &shm, w, h);
if (!img) {
printf("XSHM_CREATE_FAIL\n");
return 1;
}
shm.shmid = shmget(IPC_PRIVATE,
(size_t)img->bytes_per_line * h,
IPC_CREAT | 0600);
if (shm.shmid < 0) {
printf("SHMGET_FAIL\n");
return 1;
}
shm.shmaddr = img->data = shmat(shm.shmid, NULL, 0);
if (shm.shmaddr == (char *)-1) {
printf("SHMAT_FAIL\n");
return 1;
}
shm.readOnly = False;
if (!XShmAttach(dpy, &shm)) {
printf("XSHM_ATTACH_FAIL (falling back)\n");
XDestroyImage(img);
img = NULL;
} else {
XSync(dpy, False);
printf("XSHM OK %dx%d bpl=%d\n", w, h,
img->bytes_per_line);
}
}
if (!img) {
img = XGetImage(dpy, root, gx, gy, w, h, AllPlanes, ZPixmap);
if (!img) {
printf("XGETIMAGE_FAIL\n");
return 1;
}
printf("XGETIMAGE OK %dx%d bpl=%d\n", w, h,
img->bytes_per_line);
}
hdr->magic = HDR_MAGIC;
hdr->version = 1;
hdr->width = (uint32_t)w;
hdr->height = (uint32_t)h;
hdr->stride = (uint32_t)w * 4;
hdr->format = 0;
for (i = 0; i < frames; i++) {
uint64_t t0 = now_ns();
unsigned char *dst = bar + FRAME_OFFSET +
sizeof(struct frame_hdr);
int x, y;
if (shm.shmaddr) {
XShmGetImage(dpy, root, img, gx, gy, AllPlanes);
} else {
XImage *n = XGetImage(dpy, root, gx, gy, w, h,
AllPlanes, ZPixmap);
if (!n)
break;
XDestroyImage(img);
img = n;
}
/* X ZPixmap: 0x00RRGGBB little-endian -> RGBA bytes */
for (y = 0; y < h; y++) {
unsigned char *s = (unsigned char *)img->data +
(size_t)y * img->bytes_per_line;
unsigned char *d = dst + (size_t)y * w * 4;
for (x = 0; x < w; x++) {
uint32_t p;
memcpy(&p, s + 4 * x, 4);
d[4 * x + 0] = (unsigned char)(p >> 16);
d[4 * x + 1] = (unsigned char)(p >> 8);
d[4 * x + 2] = (unsigned char)(p);
d[4 * x + 3] = 0xff;
}
}
hdr->timestamp_ns = now_ns();
if (!t_first)
t_first = t0;
t_last = t0;
__sync_synchronize();
*seqp = (uint32_t)(i + 1);
__sync_synchronize();
if (i < 5 || (i % 30) == 29)
printf("FRAME seq=%d ms=%.1f\n", i + 1,
(double)(now_ns() - t0) / 1e6);
if (fps > 0)
usleep((useconds_t)(1000000 / fps));
}
if (t_first && t_last > t_first)
printf("XPUB_RATE fps=%.2f frames=%d\n",
(double)(i - 1) * 1e9 /
(double)(t_last - t_first), i);
printf("FRAME_DONE frames=%d %dx%d\n", i, w, h);
if (shm.shmaddr)
XShmDetach(dpy, &shm);
XCloseDisplay(dpy);
return 0;
}
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