IABSD.fr/xenocara/dist/libepoxy/src/dispatch_egl.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_egl.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"
  
  int
  epoxy_conservative_egl_version(void)
  {
      EGLDisplay dpy = eglGetCurrentDisplay();
  
      if (!dpy)
          return 14;
  
      return epoxy_egl_version(dpy);
  }
  
  /**
   * @brief Returns the version of OpenGL we are using
   *
   * The version is encoded as:
   *
   * ```
   *
   *   version = major * 10 + minor
   *
   * ```
   *
   * So it can be easily used for version comparisons.
   *
   * @param The EGL display
   *
   * @return The encoded version of EGL we are using
   *
   * @see epoxy_gl_version()
   */
  int
  epoxy_egl_version(EGLDisplay dpy)
  {
      int major, minor;
      const char *version_string;
      int ret;
  
      version_string = eglQueryString(dpy, EGL_VERSION);
      if (!version_string)
          return 0;
  
      ret = sscanf(version_string, "%d.%d", &major, &minor);
      assert(ret == 2);
      return major * 10 + minor;
  }
  
  bool
  epoxy_conservative_has_egl_extension(const char *ext)
  {
      return epoxy_has_egl_extension(eglGetCurrentDisplay(), ext);
  }
  
  /**
   * @brief Returns true if the given EGL extension is supported in the current context.
   *
   * @param dpy The EGL display
   * @param extension The name of the EGL extension
   *
   * @return `true` if the extension is available
   *
   * @see epoxy_has_gl_extension()
   * @see epoxy_has_glx_extension()
   */
  bool
  epoxy_has_egl_extension(EGLDisplay dpy, const char *ext)
  {
      return epoxy_extension_in_string(eglQueryString(dpy, EGL_EXTENSIONS), ext) || epoxy_extension_in_string(eglQueryString(NULL, EGL_EXTENSIONS), ext);
  }
  
  /**
   * @brief Checks whether EGL is available.
   *
   * @return `true` if EGL is available
   *
   * @newin{1,4}
   */
  bool
  epoxy_has_egl(void)
  {
  #if !PLATFORM_HAS_EGL
      return false;
  #else
      if (epoxy_load_egl(false, true)) {
          EGLDisplay* (* pf_eglGetCurrentDisplay) (void);
  
          pf_eglGetCurrentDisplay = epoxy_conservative_egl_dlsym("eglGetCurrentDisplay", false);
          if (pf_eglGetCurrentDisplay)
              return true;
      }
  
      return false;
  #endif /* PLATFORM_HAS_EGL */
  }