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  1. /*
  2.  * Copyright (c) 2007-2011 Intel Corporation. All Rights Reserved.
  3.  *
  4.  * Permission is hereby granted, free of charge, to any person obtaining a
  5.  * copy of this software and associated documentation files (the
  6.  * "Software"), to deal in the Software without restriction, including
  7.  * without limitation the rights to use, copy, modify, merge, publish,
  8.  * distribute, sub license, and/or sell copies of the Software, and to
  9.  * permit persons to whom the Software is furnished to do so, subject to
  10.  * the following conditions:
  11.  *
  12.  * The above copyright notice and this permission notice (including the
  13.  * next paragraph) shall be included in all copies or substantial portions
  14.  * of the Software.
  15.  *
  16.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  17.  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  18.  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  19.  * IN NO EVENT SHALL INTEL AND/OR ITS SUPPLIERS BE LIABLE FOR
  20.  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  21.  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  22.  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23.  */
  24.  
  25. /**
  26.  * \file va_compat.h
  27.  * \brief The Compatibility API
  28.  *
  29.  * This file contains the \ref api_compat "Compatibility API".
  30.  */
  31.  
  32. #ifndef VA_COMPAT_H
  33. #define VA_COMPAT_H
  34.  
  35. #ifdef __cplusplus
  36. extern "C" {
  37. #endif
  38.  
  39. /**
  40.  * \defgroup api_compat Compatibility API
  41.  *
  42.  * The Compatibility API allows older programs that are not ported to
  43.  * the current API to still build and run correctly. In particular,
  44.  * this exposes older API to allow for backwards source compatibility.
  45.  *
  46.  * @{
  47.  */
  48.  
  49. /**
  50.  * Makes a string literal out of the macro argument
  51.  */
  52. #define VA_CPP_HELPER_STRINGIFY(x) \
  53.     VA_CPP_HELPER_STRINGIFY_(x)
  54. #define VA_CPP_HELPER_STRINGIFY_(x) \
  55.     #x
  56.  
  57. /**
  58.  * Concatenates two macro arguments at preprocessing time.
  59.  */
  60. #define VA_CPP_HELPER_CONCAT(a, b) \
  61.     VA_CPP_HELPER_CONCAT_(a, b)
  62. #define VA_CPP_HELPER_CONCAT_(a, b) \
  63.     a ## b
  64.  
  65. /**
  66.  * Generates the number of macro arguments at preprocessing time.
  67.  * <http://groups.google.com/group/comp.std.c/browse_thread/thread/77ee8c8f92e4a3fb/346fc464319b1ee5>
  68.  *
  69.  * Note: this doesn't work for macros with no arguments
  70.  */
  71. #define VA_CPP_HELPER_N_ARGS(...) \
  72.     VA_CPP_HELPER_N_ARGS_(__VA_ARGS__, VA_CPP_HELPER_N_ARGS_LIST_REV())
  73. #define VA_CPP_HELPER_N_ARGS_(...) \
  74.     VA_CPP_HELPER_N_ARGS_LIST(__VA_ARGS__)
  75. #define VA_CPP_HELPER_N_ARGS_LIST(a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a12, a13, a14, a15, a16, N, ...) N
  76. #define VA_CPP_HELPER_N_ARGS_LIST_REV() \
  77.     15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0
  78.  
  79. /**
  80.  * Generates a versioned function alias.
  81.  *
  82.  * VA_CPP_HELPER_ALIAS(vaSomeFunction, 0,32,0) will generate
  83.  *   .symber vaSomeFunction_0_32_0, vaSomeFunction@VA_API_0.32.0
  84.  */
  85. #define VA_CPP_HELPER_ALIAS(func, major, minor, micro) \
  86.     VA_CPP_HELPER_ALIAS_(func, major, minor, micro, "@")
  87. #define VA_CPP_HELPER_ALIAS_DEFAULT(func, major, minor, micro) \
  88.     VA_CPP_HELPER_ALIAS_(func, major, minor, micro, "@@")
  89. #define VA_CPP_HELPER_ALIAS_(func, major, minor, micro, binding)        \
  90.     asm(".symver " #func "_" #major "_" #minor "_" #micro ", "          \
  91.         #func binding "VA_API_" #major "." #minor "." #micro)
  92.  
  93. /* vaCreateSurfaces() */
  94.  
  95. #ifndef VA_COMPAT_DISABLED
  96. #define vaCreateSurfaces(dpy, ...)                                      \
  97.     VA_CPP_HELPER_CONCAT(vaCreateSurfaces,                              \
  98.                          VA_CPP_HELPER_N_ARGS(dpy, __VA_ARGS__))        \
  99.     (dpy, __VA_ARGS__)
  100. #endif
  101.  
  102. #define vaCreateSurfaces6(dpy, width, height, format, num_surfaces, surfaces) \
  103.     (vaCreateSurfaces)(dpy, format, width, height, surfaces, num_surfaces, \
  104.                        NULL, 0)
  105.  
  106. #define vaCreateSurfaces8(dpy, format, width, height, surfaces, num_surfaces, attribs, num_attribs) \
  107.     (vaCreateSurfaces)(dpy, format, width, height, surfaces, num_surfaces, \
  108.                        attribs, num_attribs)
  109.  
  110. /*@}*/
  111.  
  112. #ifdef __cplusplus
  113. }
  114. #endif
  115.  
  116. #endif /* VA_COMPAT_H */
  117.