src/egl/main/eglglobals.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2008 VMware, Inc.
   4  * Copyright 2009-2010 Chia-I Wu <olvaffe@gmail.com>
   5  * Copyright 2010-2011 LunarG, Inc.
   6  * All Rights Reserved.
   7  *
   8  * Permission is hereby granted, free of charge, to any person obtaining a
   9  * copy of this software and associated documentation files (the
  10  * "Software"), to deal in the Software without restriction, including
  11  * without limitation the rights to use, copy, modify, merge, publish,
  12  * distribute, sub license, and/or sell copies of the Software, and to
  13  * permit persons to whom the Software is furnished to do so, subject to
  14  * the following conditions:
  15  *
  16  * The above copyright notice and this permission notice (including the
  17  * next paragraph) shall be included in all copies or substantial portions
  18  * of the Software.
  19  *
  20  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  21  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  23  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  24  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  25  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  26  * DEALINGS IN THE SOFTWARE.
  27  *
  28  **************************************************************************/
  29
  30
  31 #include <stdlib.h>
  32 #include <stdio.h>
  33 #include <string.h>
  34 #include <assert.h>
  35 #include "c11/threads.h"
  36
  37 #include "eglglobals.h"
  38 #include "egldisplay.h"
  39 #include "egldriver.h"
  40
  41
  42 static mtx_t _eglGlobalMutex = _MTX_INITIALIZER_NP;
  43
  44 struct _egl_global _eglGlobal =
  45 {
  46    &_eglGlobalMutex,       /* Mutex */
  47    NULL,                   /* DisplayList */
  48    2,                      /* NumAtExitCalls */
  49    {
  50       /* default AtExitCalls, called in reverse order */
  51       _eglUnloadDrivers, /* always called last */
  52       _eglFiniDisplay
  53    },
  54
  55    /* ClientOnlyExtensionString */
  56    "EGL_EXT_client_extensions"
  57    " EGL_EXT_platform_base"
  58    " EGL_KHR_client_get_all_proc_addresses"
  59    " EGL_KHR_debug",
  60
  61    /* PlatformExtensionString */
  62 #ifdef HAVE_WAYLAND_PLATFORM
  63    " EGL_EXT_platform_wayland"
  64 #endif
  65 #ifdef HAVE_X11_PLATFORM
  66    " EGL_EXT_platform_x11"
  67 #endif
  68 #ifdef HAVE_DRM_PLATFORM
  69    " EGL_MESA_platform_gbm"
  70 #endif
  71 #ifdef HAVE_SURFACELESS_PLATFORM
  72    " EGL_MESA_platform_surfaceless"
  73 #endif
  74    "",
  75
  76    NULL, /* ClientExtensionsString */
  77
  78    NULL, /* debugCallback */
  79    _EGL_DEBUG_BIT_CRITICAL | _EGL_DEBUG_BIT_ERROR, /* debugTypesEnabled */
  80 };
  81
  82
  83 static void
  84 _eglAtExit(void)
  85 {
  86    EGLint i;
  87    for (i = _eglGlobal.NumAtExitCalls - 1; i >= 0; i--)
  88       _eglGlobal.AtExitCalls[i]();
  89 }
  90
  91
  92 void
  93 _eglAddAtExitCall(void (*func)(void))
  94 {
  95    if (func) {
  96       static EGLBoolean registered = EGL_FALSE;
  97
  98       mtx_lock(_eglGlobal.Mutex);
  99
 100       if (!registered) {
 101          atexit(_eglAtExit);
 102          registered = EGL_TRUE;
 103       }
 104
 105       assert(_eglGlobal.NumAtExitCalls < ARRAY_SIZE(_eglGlobal.AtExitCalls));
 106       _eglGlobal.AtExitCalls[_eglGlobal.NumAtExitCalls++] = func;
 107
 108       mtx_unlock(_eglGlobal.Mutex);
 109    }
 110 }
 111
 112 const char *
 113 _eglGetClientExtensionString(void)
 114 {
 115    const char *ret;
 116
 117    mtx_lock(_eglGlobal.Mutex);
 118
 119    if (_eglGlobal.ClientExtensionString == NULL) {
 120       size_t clientLen = strlen(_eglGlobal.ClientOnlyExtensionString);
 121       size_t platformLen = strlen(_eglGlobal.PlatformExtensionString);
 122
 123       _eglGlobal.ClientExtensionString = (char *) malloc(clientLen + platformLen + 1);
 124       if (_eglGlobal.ClientExtensionString != NULL) {
 125          char *ptr = _eglGlobal.ClientExtensionString;
 126
 127          memcpy(ptr, _eglGlobal.ClientOnlyExtensionString, clientLen);
 128          ptr += clientLen;
 129
 130          if (platformLen > 0) {
 131             // Note that if PlatformExtensionString is not empty, then it will
 132             // already have a leading space.
 133             assert(_eglGlobal.PlatformExtensionString[0] == ' ');
 134             memcpy(ptr, _eglGlobal.PlatformExtensionString, platformLen);
 135             ptr += platformLen;
 136          }
 137          *ptr = '\0';
 138       }
 139    }
 140    ret = _eglGlobal.ClientExtensionString;
 141
 142    mtx_unlock(_eglGlobal.Mutex);
 143    return ret;
 144 }