blob: da87306cf2af10227fddf2c91c85834cf32e0373 [file] [log] [blame]
/*
* Copyright © 2007 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*
* Authors:
* Jesse Barnes <jesse.barnes@intel.com>
*
*/
/** @file glsync.c
* The program is simple: it paints a window alternating colors (red &
* white) either as fast as possible or synchronized to vblank events
*
* If run normally, the program should display a window that exhibits
* significant tearing between red and white colors (e.g. you might get
* a "waterfall" effect of red and white horizontal bars).
*
* If run with the '-s b' option, the program should synchronize the
* window color changes with the vertical blank period, resulting in a
* window that looks orangish with a high frequency flicker (which may
* be invisible). If the window is moved to another screen, this
* property should be preserved. If the window spans two screens, it
* shouldn't tear on whichever screen most of the window is on; the
* portion on the other screen may show some tearing (like the
* waterfall effect above).
*
* Other options include '-w <width>' and '-h <height' to set the
* window size.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <GL/gl.h>
#include <GL/glu.h>
#include <GL/glx.h>
#include <GL/glxext.h>
#include <X11/X.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
void (*video_sync_get)();
void (*video_sync)();
static int GLXExtensionSupported(Display *dpy, const char *extension)
{
const char *extensionsString, *client_extensions, *pos;
extensionsString = glXQueryExtensionsString(dpy, DefaultScreen(dpy));
client_extensions = glXGetClientString(dpy, GLX_EXTENSIONS);
pos = strstr(extensionsString, extension);
if (pos != NULL && (pos == extensionsString || pos[-1] == ' ') &&
(pos[strlen(extension)] == ' ' || pos[strlen(extension)] == '\0'))
return 1;
pos = strstr(client_extensions, extension);
if (pos != NULL && (pos == extensionsString || pos[-1] == ' ') &&
(pos[strlen(extension)] == ' ' || pos[strlen(extension)] == '\0'))
return 1;
return 0;
}
extern char *optarg;
extern int optind, opterr, optopt;
static char optstr[] = "w:h:s:v";
enum sync_type {
none = 0,
sgi_video_sync,
buffer_swap,
};
static void usage(char *name)
{
printf("usage: %s [-w <width>] [-h <height>] [-s<sync method>] "
"[-v]\n", name);
printf("\t-s<sync method>:\n");
printf("\t\tn: none\n");
printf("\t\ts: SGI video sync extension\n");
printf("\t\tb: buffer swap\n");
printf("\t-v: verbose (print count)\n");
exit(-1);
}
int main(int argc, char *argv[])
{
Display *disp;
XVisualInfo *pvi;
XSetWindowAttributes swa;
int attrib[14];
GLint last_val = -1, count = 0;
Window winGL;
GLXContext context;
int dummy;
Atom wmDelete;
enum sync_type waitforsync = none;
int width = 500, height = 500, verbose = 0,
countonly = 0;
int c, i = 1;
opterr = 0;
while ((c = getopt(argc, argv, optstr)) != -1) {
switch (c) {
case 'w':
width = atoi(optarg);
break;
case 'h':
height = atoi(optarg);
break;
case 's':
switch (optarg[0]) {
case 'n':
waitforsync = none;
break;
case 's':
waitforsync = sgi_video_sync;
break;
case 'b':
waitforsync = buffer_swap;
break;
default:
usage(argv[0]);
break;
}
break;
case 'v':
verbose = 1;
break;
default:
usage(argv[0]);
break;
}
}
disp = XOpenDisplay(NULL);
if (!disp) {
fprintf(stderr, "failed to open display\n");
return -1;
}
if (!glXQueryExtension(disp, &dummy, &dummy)) {
fprintf(stderr, "glXQueryExtension failed\n");
return -1;
}
if (!GLXExtensionSupported(disp, "GLX_SGI_video_sync")) {
fprintf(stderr, "GLX_SGI_video_sync not supported, exiting\n");
return -1;
}
attrib[0] = GLX_RGBA;
attrib[1] = 1;
attrib[2] = GLX_RED_SIZE;
attrib[3] = 1;
attrib[4] = GLX_GREEN_SIZE;
attrib[5] = 1;
attrib[6] = GLX_BLUE_SIZE;
attrib[7] = 1;
if (waitforsync != buffer_swap)
attrib[8] = None;
else {
attrib[8] = GLX_DOUBLEBUFFER;
attrib[9] = 1;
attrib[10] = None;
}
pvi = glXChooseVisual(disp, DefaultScreen(disp), attrib);
if (!pvi) {
fprintf(stderr, "failed to choose visual, exiting\n");
return -1;
}
context = glXCreateContext(disp, pvi, None, GL_TRUE);
if (!context) {
fprintf(stderr, "failed to create glx context\n");
return -1;
}
pvi->screen = DefaultScreen(disp);
swa.colormap = XCreateColormap(disp, RootWindow(disp, pvi->screen),
pvi->visual, AllocNone);
swa.border_pixel = 0;
swa.event_mask = ExposureMask | KeyPressMask | ButtonPressMask |
StructureNotifyMask;
winGL = XCreateWindow(disp, RootWindow(disp, pvi->screen),
0, 0,
width, height,
0, pvi->depth, InputOutput, pvi->visual,
CWBorderPixel | CWColormap | CWEventMask, &swa);
if (!winGL) {
fprintf(stderr, "window creation failed\n");
return -1;
}
wmDelete = XInternAtom(disp, "WM_DELETE_WINDOW", True);
XSetWMProtocols(disp, winGL, &wmDelete, 1);
XSetStandardProperties(disp, winGL, "glsync test", "glsync text",
None, NULL, 0, NULL);
XMapRaised(disp, winGL);
glXMakeCurrent(disp, winGL, context);
video_sync_get = glXGetProcAddress((unsigned char *)"glXGetVideoSyncSGI");
video_sync = glXGetProcAddress((unsigned char *)"glXWaitVideoSyncSGI");
if (!video_sync_get || !video_sync) {
fprintf(stderr, "failed to get sync functions\n");
return -1;
}
video_sync_get(&count);
count++;
while (i++) {
/* Wait for vsync */
if (waitforsync == sgi_video_sync) {
if (verbose)
fprintf(stderr, "waiting on count %d\n", count);
video_sync(2, (count + 1) % 2, &count);
if (count < last_val)
fprintf(stderr, "error: vblank count went backwards: %d -> %d\n", last_val, count);
if (count == last_val)
fprintf(stderr, "error: count didn't change: %d\n", count);
last_val = count;
} else if (waitforsync == buffer_swap) {
glXSwapBuffers(disp, winGL);
}
if (countonly) {
video_sync(2, 1, &count);
fprintf(stderr, "current count: %d\n", count);
sleep(1);
continue;
}
/* Alternate colors to make tearing obvious */
if (i & 1)
glClearColor(1.0f, 1.0f, 1.0f, 1.0f);
else
glClearColor(1.0f, 0.0f, 0.0f, 0.0f);
glClear(GL_COLOR_BUFFER_BIT);
glFlush();
}
XDestroyWindow(disp, winGL);
glXDestroyContext(disp, context);
XCloseDisplay(disp);
return 0;
}