IABSD.fr/xenocara/xserver/glamor/glamor_egl.h

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• Author : matthieu
  Date : 2019-12-12 06:05:17
  Hash : 9a532c54
  Message : Update to X server 1.20.6. Tested by naddy@

• xserver/glamor/glamor_egl.h

• /*
   * Copyright © 2016 Red Hat, Inc.
   *
   * 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:
   *	Adam Jackson <ajax@redhat.com>
   */
  
  #ifndef GLAMOR_EGL_H
  #define GLAMOR_EGL_H
  
  #define MESA_EGL_NO_X11_HEADERS
  #define EGL_NO_X11
  #include <epoxy/gl.h>
  #include <epoxy/egl.h>
  #include <glamor_egl_ext.h>
  
  /*
   * Create an EGLDisplay from a native display type. This is a little quirky
   * for a few reasons.
   *
   * 1: GetPlatformDisplayEXT and GetPlatformDisplay are the API you want to
   * use, but have different function signatures in the third argument; this
   * happens not to matter for us, at the moment, but it means epoxy won't alias
   * them together.
   *
   * 2: epoxy 1.3 and earlier don't understand EGL client extensions, which
   * means you can't call "eglGetPlatformDisplayEXT" directly, as the resolver
   * will crash.
   *
   * 3: You can't tell whether you have EGL 1.5 at this point, because
   * eglQueryString(EGL_VERSION) is a property of the display, which we don't
   * have yet. So you have to query for extensions no matter what. Fortunately
   * epoxy_has_egl_extension _does_ let you query for client extensions, so
   * we don't have to write our own extension string parsing.
   *
   * 4. There is no EGL_KHR_platform_base to complement the EXT one, thus one
   * needs to know EGL 1.5 is supported in order to use the eglGetPlatformDisplay
   * function pointer.
   * We can workaround this (circular dependency) by probing for the EGL 1.5
   * platform extensions (EGL_KHR_platform_gbm and friends) yet it doesn't seem
   * like mesa will be able to adverise these (even though it can do EGL 1.5).
   */
  static inline EGLDisplay
  glamor_egl_get_display(EGLint type, void *native)
  {
      /* In practise any EGL 1.5 implementation would support the EXT extension */
      if (epoxy_has_egl_extension(NULL, "EGL_EXT_platform_base")) {
          PFNEGLGETPLATFORMDISPLAYEXTPROC getPlatformDisplayEXT =
              (void *) eglGetProcAddress("eglGetPlatformDisplayEXT");
          if (getPlatformDisplayEXT)
              return getPlatformDisplayEXT(type, native, NULL);
      }
  
      /* Welp, everything is awful. */
      return eglGetDisplay(native);
  }
  
  #endif