third_party/libva/va/va_compat.h

   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 */