diff options
Diffstat (limited to 'third_party/libepoxy/libepoxy/src/dispatch_glx.c')
-rw-r--r-- | third_party/libepoxy/libepoxy/src/dispatch_glx.c | 172 |
1 files changed, 172 insertions, 0 deletions
diff --git a/third_party/libepoxy/libepoxy/src/dispatch_glx.c b/third_party/libepoxy/libepoxy/src/dispatch_glx.c new file mode 100644 index 0000000000..e3955644d7 --- /dev/null +++ b/third_party/libepoxy/libepoxy/src/dispatch_glx.c @@ -0,0 +1,172 @@ +/* + * Copyright © 2013 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. + */ + +#include <assert.h> +#include <string.h> +#include <stdio.h> + +#include "dispatch_common.h" + +/** + * If we can determine the GLX version from the current context, then + * return that, otherwise return a version that will just send us on + * to dlsym() or get_proc_address(). + */ +int +epoxy_conservative_glx_version(void) +{ + Display *dpy = glXGetCurrentDisplay(); + GLXContext ctx = glXGetCurrentContext(); + int screen; + + if (!dpy || !ctx) + return 14; + + glXQueryContext(dpy, ctx, GLX_SCREEN, &screen); + + return epoxy_glx_version(dpy, screen); +} + + +/** + * @brief Returns the version of GLX we are using + * + * The version is encoded as: + * + * ``` + * + * version = major * 10 + minor + * + * ``` + * + * So it can be easily used for version comparisons. + * + * @param dpy The X11 display + * @param screen The X11 screen + * + * @return The encoded version of GLX we are using + * + * @see epoxy_gl_version() + */ +int +epoxy_glx_version(Display *dpy, int screen) +{ + int server_major, server_minor; + int client_major, client_minor; + int server, client; + const char *version_string; + int ret; + + version_string = glXQueryServerString(dpy, screen, GLX_VERSION); + if (!version_string) + return 0; + + ret = sscanf(version_string, "%d.%d", &server_major, &server_minor); + assert(ret == 2); + server = server_major * 10 + server_minor; + + version_string = glXGetClientString(dpy, GLX_VERSION); + if (!version_string) + return 0; + + ret = sscanf(version_string, "%d.%d", &client_major, &client_minor); + assert(ret == 2); + client = client_major * 10 + client_minor; + + if (client < server) + return client; + else + return server; +} + +/** + * If we can determine the GLX extension support from the current + * context, then return that, otherwise give the answer that will just + * send us on to get_proc_address(). + */ +bool +epoxy_conservative_has_glx_extension(const char *ext) +{ + Display *dpy = glXGetCurrentDisplay(); + GLXContext ctx = glXGetCurrentContext(); + int screen; + + if (!dpy || !ctx) + return true; + + glXQueryContext(dpy, ctx, GLX_SCREEN, &screen); + + return epoxy_has_glx_extension(dpy, screen, ext); +} + +/** + * @brief Returns true if the given GLX extension is supported in the current context. + * + * @param dpy The X11 display + * @param screen The X11 screen + * @param extension The name of the GLX extension + * + * @return `true` if the extension is available + * + * @see epoxy_has_gl_extension() + * @see epoxy_has_egl_extension() + */ +bool +epoxy_has_glx_extension(Display *dpy, int screen, const char *ext) +{ + /* No, you can't just use glXGetClientString or + * glXGetServerString() here. Those each tell you about one half + * of what's needed for an extension to be supported, and + * glXQueryExtensionsString() is what gives you the intersection + * of the two. + */ + return epoxy_extension_in_string(glXQueryExtensionsString(dpy, screen), ext); +} + +/** + * @brief Checks whether GLX is available. + * + * @param dpy The X11 display + * + * @return `true` if GLX is available + * + * @newin{1,4} + */ +bool +epoxy_has_glx(Display *dpy) +{ +#if !PLATFORM_HAS_GLX + return false; +#else + if (epoxy_load_glx(false, true)) { + Bool (* pf_glXQueryExtension) (Display *, int *, int *); + int error_base, event_base; + + pf_glXQueryExtension = epoxy_conservative_glx_dlsym("glXQueryExtension", false); + if (pf_glXQueryExtension && pf_glXQueryExtension(dpy, &error_base, &event_base)) + return true; + } + + return false; +#endif /* !PLATFORM_HAS_GLX */ +} |