/* * Copyright © 2007-2010 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 * */ /** @file omlsync.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 ' and '-h ' to set the * window size. */ #include #include #include #include #include #include #include #include #include #include #include Bool (*glXGetSyncValuesOML)(Display *dpy, GLXDrawable drawable, int64_t *ust, int64_t *msc, int64_t *sbc); Bool (*glXGetMscRateOML)(Display *dpy, GLXDrawable drawable, int32_t *numerator, int32_t *denominator); int64_t (*glXSwapBuffersMscOML)(Display *dpy, GLXDrawable drawable, int64_t target_msc, int64_t divisor, int64_t remainder); Bool (*glXWaitForMscOML)(Display *dpy, GLXDrawable drawable, int64_t target_msc, int64_t divisor, int64_t remainder, int64_t *ust, int64_t *msc, int64_t *sbc); Bool (*glXWaitForSbcOML)(Display *dpy, GLXDrawable drawable, int64_t target_sbc, int64_t *ust, int64_t *msc, int64_t *sbc); int (*glXSwapInterval)(int interval); static int GLXExtensionSupported(Display *dpy, const char *extension) { const char *extensionsString, *pos; extensionsString = glXQueryExtensionsString(dpy, DefaultScreen(dpy)); pos = strstr(extensionsString, 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:vd:r:n:i:"; static void usage(char *name) { printf("usage: %s [-w ] [-h ] ...\n", name); printf("\t-d - divisor for OML swap\n"); printf("\t-r - remainder for OML swap\n"); printf("\t-n - wait interval for OML WaitMSC\n"); printf("\t-i - swap at most once every n frames\n"); printf("\t-v: verbose (print count)\n"); exit(-1); } int main(int argc, char *argv[]) { Display *disp; XVisualInfo *pvi; XSetWindowAttributes swa; Window winGL; GLXContext context; int dummy; Atom wmDelete; int64_t ust, msc, sbc; int width = 500, height = 500, verbose = 0, divisor = 0, remainder = 0, wait_interval = 0, swap_interval = 1; int c, i = 1; int ret; int db_attribs[] = { GLX_RGBA, GLX_RED_SIZE, 1, GLX_GREEN_SIZE, 1, GLX_BLUE_SIZE, 1, GLX_DOUBLEBUFFER, GLX_DEPTH_SIZE, 1, None }; XSizeHints sizehints; opterr = 0; while ((c = getopt(argc, argv, optstr)) != -1) { switch (c) { case 'w': width = atoi(optarg); break; case 'h': height = atoi(optarg); break; case 'v': verbose = 1; break; case 'd': divisor = atoi(optarg); break; case 'r': remainder = atoi(optarg); break; case 'n': wait_interval = atoi(optarg); break; case 'i': swap_interval = atoi(optarg); 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_OML_sync_control")) { fprintf(stderr, "GLX_OML_sync_control not supported\n"); return -1; } if (!GLXExtensionSupported(disp, "GLX_MESA_swap_control")) { fprintf(stderr, "GLX_MESA_swap_control not supported\n"); return -1; } pvi = glXChooseVisual(disp, DefaultScreen(disp), db_attribs); if (!pvi) { fprintf(stderr, "failed to choose visual, exiting\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); sizehints.x = 0; sizehints.y = 0; sizehints.width = width; sizehints.height = height; sizehints.flags = USSize | USPosition; XSetNormalHints(disp, winGL, &sizehints); XSetStandardProperties(disp, winGL, "glsync test", "glsync text", None, NULL, 0, &sizehints); context = glXCreateContext(disp, pvi, NULL, GL_TRUE); if (!context) { fprintf(stderr, "failed to create glx context\n"); return -1; } XMapWindow(disp, winGL); ret = glXMakeCurrent(disp, winGL, context); if (!ret) { fprintf(stderr, "failed to make context current: %d\n", ret); } glXGetSyncValuesOML = (void *)glXGetProcAddress((unsigned char *)"glXGetSyncValuesOML"); glXGetMscRateOML = (void *)glXGetProcAddress((unsigned char *)"glXGetMscRateOML"); glXSwapBuffersMscOML = (void *)glXGetProcAddress((unsigned char *)"glXSwapBuffersMscOML"); glXWaitForMscOML = (void *)glXGetProcAddress((unsigned char *)"glXWaitForMscOML"); glXWaitForSbcOML = (void *)glXGetProcAddress((unsigned char *)"glXWaitForSbcOML"); glXSwapInterval = (void *)glXGetProcAddress((unsigned char *)"glXSwapIntervalMESA"); glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glXSwapInterval(swap_interval); fprintf(stderr, "set swap interval to %d\n", swap_interval); glXGetSyncValuesOML(disp, winGL, &ust, &msc, &sbc); while (i++) { /* Alternate colors to make tearing obvious */ if (i & 1) { glClearColor(1.0f, 1.0f, 1.0f, 1.0f); glColor3f(1.0f, 1.0f, 1.0f); } else { glClearColor(1.0f, 0.0f, 0.0f, 0.0f); glColor3f(1.0f, 0.0f, 0.0f); } glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glRectf(0, 0, width, height); glXSwapBuffersMscOML(disp, winGL, 0, divisor, remainder); if (wait_interval) { glXWaitForMscOML(disp, winGL, msc + wait_interval, 0, 0, &ust, &msc, &sbc); } } XDestroyWindow(disp, winGL); glXDestroyContext(disp, context); XCloseDisplay(disp); return 0; }