IABSD.fr/xenocara/dist/libepoxy/src/dispatch_glx.c

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• Author : matthieu
  Date : 2018-05-25 06:24:59
  Hash : 9d6c7364
  Message : Update to libepoxy 1.5.2. ok aja@

• dist/libepoxy/src/dispatch_glx.c

• /*
   * 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 */
  }