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#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/extensions/Xfixes.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <time.h>
#include <xf86drm.h>
#include <drm.h>
#include "dri2.h"
#define COUNT 60
static int dri2_open(Display *dpy)
{
drm_auth_t auth;
char *driver, *device;
int fd;
if (!DRI2Connect(dpy, DefaultRootWindow(dpy), &driver, &device))
return -1;
printf ("Connecting to %s driver on %s\n", driver, device);
fd = open(device, O_RDWR);
if (fd < 0)
return -1;
if (drmIoctl(fd, DRM_IOCTL_GET_MAGIC, &auth))
return -1;
if (!DRI2Authenticate(dpy, DefaultRootWindow(dpy), auth.magic))
return -1;
return fd;
}
static void dri2_copy_swap(Display *dpy, Drawable d,
int width, int height, int has_front)
{
XRectangle rect;
XserverRegion region;
rect.x = 0;
rect.y = 0;
rect.width = width;
rect.height = height;
region = XFixesCreateRegion(dpy, &rect, 1);
DRI2CopyRegion(dpy, d, region, DRI2BufferFrontLeft, DRI2BufferBackLeft);
if (has_front)
DRI2CopyRegion(dpy, d, region, DRI2BufferFakeFrontLeft, DRI2BufferFrontLeft);
XFixesDestroyRegion(dpy, region);
}
static void xsync(Display *dpy, Window win)
{
XImage *image;
image = XGetImage(dpy, win, 0, 0, 1, 1, ~0, ZPixmap);
if (image)
XDestroyImage(image);
}
static double elapsed(const struct timespec *start,
const struct timespec *end)
{
return (end->tv_sec - start->tv_sec) +
1e-9*(end->tv_nsec - start->tv_nsec);
}
static void run(Display *dpy, int width, int height,
unsigned int *attachments, int nattachments,
const char *name)
{
Window win;
XSetWindowAttributes attr;
int count;
DRI2Buffer *buffers;
struct timespec start, end;
/* Be nasty and install a fullscreen window on top so that we
* can guarantee we do not get clipped by children.
*/
attr.override_redirect = 1;
win = XCreateWindow(dpy, DefaultRootWindow(dpy),
0, 0, width, height, 0,
DefaultDepth(dpy, DefaultScreen(dpy)),
InputOutput,
DefaultVisual(dpy, DefaultScreen(dpy)),
CWOverrideRedirect, &attr);
XMapWindow(dpy, win);
xsync(dpy, win);
DRI2CreateDrawable(dpy, win);
buffers = DRI2GetBuffers(dpy, win, &width, &height,
attachments, nattachments, &count);
if (count != nattachments)
return;
xsync(dpy, win);
clock_gettime(CLOCK_MONOTONIC, &start);
for (count = 0; count < COUNT; count++)
DRI2SwapBuffers(dpy, win, 0, 0, 0);
xsync(dpy, win);
clock_gettime(CLOCK_MONOTONIC, &end);
printf("%d %s (%dx%d) swaps in %fs.\n",
count, name, width, height, elapsed(&start, &end));
xsync(dpy, win);
clock_gettime(CLOCK_MONOTONIC, &start);
for (count = 0; count < COUNT; count++)
dri2_copy_swap(dpy, win, width, height, nattachments == 2);
xsync(dpy, win);
clock_gettime(CLOCK_MONOTONIC, &end);
printf("%d %s (%dx%d) blits in %fs.\n",
count, name, width, height, elapsed(&start, &end));
DRI2SwapInterval(dpy, win, 0);
xsync(dpy, win);
clock_gettime(CLOCK_MONOTONIC, &start);
for (count = 0; count < COUNT; count++)
DRI2SwapBuffers(dpy, win, 0, 0, 0);
xsync(dpy, win);
clock_gettime(CLOCK_MONOTONIC, &end);
printf("%d %s (%dx%d) vblank=0 swaps in %fs.\n",
count, name, width, height, elapsed(&start, &end));
XDestroyWindow(dpy, win);
free(buffers);
XSync(dpy, 1);
}
int main(void)
{
Display *dpy;
int width, height, fd;
unsigned int attachments[] = {
DRI2BufferBackLeft,
DRI2BufferFrontLeft,
};
dpy = XOpenDisplay (NULL);
if (dpy == NULL)
return 77;
fd = dri2_open(dpy);
if (fd < 0)
return 1;
width = WidthOfScreen(DefaultScreenOfDisplay(dpy));
height = HeightOfScreen(DefaultScreenOfDisplay(dpy));
run(dpy, width, height, attachments, 1, "fullscreen");
run(dpy, width, height, attachments, 2, "fullscreen (with front)");
width /= 2;
height /= 2;
run(dpy, width, height, attachments, 1, "windowed");
run(dpy, width, height, attachments, 2, "windowed (with front)");
return 0;
}
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