--- /dev/null
+/*
+ * 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>] "
+ "[-vc]\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;
+ 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;
+ }
+
+ GLXContext context;
+ 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;
+}
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