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test/dri2: Use xcb for more accurate timing of SwapBuffers 

To do SwapBuffers correctly requires a Swap/Get buffers combination, and
this is easiest using xcb rather than xlib.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2015-01-28 11:44:41 +00:00
parent 6f6190abcf
commit 2e7ae76038
2 changed files with 29 additions and 3 deletions
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2
configure.ac
View File

@ -205,7 +205,7 @@ if test "x$UDEV" != "xno"; then
fi
fi
PKG_CHECK_MODULES(X11, [x11 xrender xrandr xext xfixes cairo cairo-xlib-xrender pixman-1 libpng], [x11="yes"], [x11="no"])
PKG_CHECK_MODULES(X11, [x11 x11-xcb xcb-dri2 xrender xrandr xext xfixes cairo cairo-xlib-xrender pixman-1 libpng], [x11="yes"], [x11="no"])
AM_CONDITIONAL(HAVE_X11, test "x$x11" = "xyes")
cpuid="yes"

30
test/dri2-test.c
View File

@ -6,6 +6,10 @@
#include <X11/Xutil.h>
#include <X11/extensions/Xfixes.h>
#include <X11/extensions/Xrandr.h>
#include <X11/Xlib-xcb.h>
#include <xcb/xcb.h>
#include <xcb/xcbext.h>
#include <xcb/dri2.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
@ -101,10 +105,29 @@ static uint64_t check_msc(Display *dpy, Window win, uint64_t last_msc)
return current_msc;
}
static void swap_buffers(xcb_connection_t *c, Window win,
unsigned int *attachments, int nattachments)
{
unsigned int seq[2];
seq[0] = xcb_dri2_swap_buffers_unchecked(c, win,
0, 0, 0, 0, 0, 0).sequence;
seq[1] = xcb_dri2_get_buffers_unchecked(c, win,
nattachments, nattachments,
attachments).sequence;
xcb_flush(c);
xcb_discard_reply(c, seq[0]);
xcb_discard_reply(c, seq[1]);
}
static void run(Display *dpy, int width, int height,
unsigned int *attachments, int nattachments,
const char *name)
{
xcb_connection_t *c = XGetXCBConnection(dpy);
Window win;
XSetWindowAttributes attr;
int count;
@ -132,15 +155,17 @@ static void run(Display *dpy, int width, int height,
if (count != nattachments)
return;
swap_buffers(c, win, attachments, nattachments);
msc = check_msc(dpy, win, msc);
clock_gettime(CLOCK_MONOTONIC, &start);
for (count = 0; count < COUNT; count++)
DRI2SwapBuffers(dpy, win, 0, 0, 0);
swap_buffers(c, win, attachments, nattachments);
msc = check_msc(dpy, win, msc);
clock_gettime(CLOCK_MONOTONIC, &end);
printf("%d %s (%dx%d) swaps in %fs.\n",
count, name, width, height, elapsed(&start, &end));
swap_buffers(c, win, attachments, nattachments);
msc = check_msc(dpy, win, msc);
clock_gettime(CLOCK_MONOTONIC, &start);
for (count = 0; count < COUNT; count++)
@ -153,10 +178,11 @@ static void run(Display *dpy, int width, int height,
DRI2SwapInterval(dpy, win, 0);
swap_buffers(c, win, attachments, nattachments);
msc = check_msc(dpy, win, msc);
clock_gettime(CLOCK_MONOTONIC, &start);
for (count = 0; count < COUNT; count++)
DRI2SwapBuffers(dpy, win, 0, 0, 0);
swap_buffers(c, win, attachments, nattachments);
msc = check_msc(dpy, win, msc);
clock_gettime(CLOCK_MONOTONIC, &end);
printf("%d %s (%dx%d) vblank=0 swaps in %fs.\n",