diff options
| -rw-r--r-- | progs/xdemos/.gitignore | 1 | ||||
| -rw-r--r-- | progs/xdemos/Makefile | 1 | ||||
| -rw-r--r-- | progs/xdemos/glsync.c | 273 |
3 files changed, 275 insertions, 0 deletions
diff --git a/progs/xdemos/.gitignore b/progs/xdemos/.gitignore index 868249db88..084dee5d84 100644 --- a/progs/xdemos/.gitignore +++ b/progs/xdemos/.gitignore @@ -1,4 +1,5 @@ corender +glsync glthreads glxcontexts glxdemo diff --git a/progs/xdemos/Makefile b/progs/xdemos/Makefile index b259671210..f8f2f15380 100644 --- a/progs/xdemos/Makefile +++ b/progs/xdemos/Makefile @@ -12,6 +12,7 @@ LIBS = -L$(TOP)/$(LIB_DIR) -l$(GL_LIB) $(APP_LIB_DEPS) PROGS = \ corender \ + glsync \ glthreads \ glxdemo \ glxgears \ diff --git a/progs/xdemos/glsync.c b/progs/xdemos/glsync.c new file mode 100644 index 0000000000..95cd1af400 --- /dev/null +++ b/progs/xdemos/glsync.c @@ -0,0 +1,273 @@ +/* + * 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; +} |