Atlas - openxr_platform_defines.h
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1/*
2** Copyright (c) 2017-2025 The Khronos Group Inc.
3**
4** SPDX-License-Identifier: Apache-2.0 OR MIT
5*/
6
7#ifndef OPENXR_PLATFORM_DEFINES_H_
8#define OPENXR_PLATFORM_DEFINES_H_ 1
9
10#ifdef __cplusplus
11extern "C" {
12#endif
13
14/* Platform-specific calling convention macros.
15 *
16 * Platforms should define these so that OpenXR clients call OpenXR functions
17 * with the same calling conventions that the OpenXR implementation expects.
18 *
19 * XRAPI_ATTR - Placed before the return type in function declarations.
20 *              Useful for C++11 and GCC/Clang-style function attribute syntax.
21 * XRAPI_CALL - Placed after the return type in function declarations.
22 *              Useful for MSVC-style calling convention syntax.
23 * XRAPI_PTR  - Placed between the '(' and '*' in function pointer types.
24 *
25 * Function declaration:  XRAPI_ATTR void XRAPI_CALL xrFunction(void);
26 * Function pointer type: typedef void (XRAPI_PTR *PFN_xrFunction)(void);
27 */
28#if defined(_WIN32)
29#define XRAPI_ATTR
30// On Windows, functions use the stdcall convention
31#define XRAPI_CALL __stdcall
32#define XRAPI_PTR XRAPI_CALL
33#elif defined(__ANDROID__) && defined(__ARM_ARCH) && __ARM_ARCH < 7
34#error "API not supported for the 'armeabi' NDK ABI"
35#elif defined(__ANDROID__) && defined(__ARM_ARCH) && __ARM_ARCH >= 7 && defined(__ARM_32BIT_STATE)
36// On Android 32-bit ARM targets, functions use the "hardfloat"
37// calling convention, i.e. float parameters are passed in registers. This
38// is true even if the rest of the application passes floats on the stack,
39// as it does by default when compiling for the armeabi-v7a NDK ABI.
40#define XRAPI_ATTR __attribute__((pcs("aapcs-vfp")))
41#define XRAPI_CALL
42#define XRAPI_PTR XRAPI_ATTR
43#else
44// On other platforms, use the default calling convention
45#define XRAPI_ATTR
46#define XRAPI_CALL
47#define XRAPI_PTR
48#endif
49
50#include <stddef.h>
51
52#if !defined(XR_NO_STDINT_H)
53#if defined(_MSC_VER) && (_MSC_VER < 1600)
54typedef signed __int8 int8_t;
55typedef unsigned __int8 uint8_t;
56typedef signed __int16 int16_t;
57typedef unsigned __int16 uint16_t;
58typedef signed __int32 int32_t;
59typedef unsigned __int32 uint32_t;
60typedef signed __int64 int64_t;
61typedef unsigned __int64 uint64_t;
62#else
63#include <stdint.h>
64#endif
65#endif  // !defined( XR_NO_STDINT_H )
66
67// XR_PTR_SIZE (in bytes)
68#if (defined(__LP64__) || defined(_WIN64) || (defined(__x86_64__) && !defined(__ILP32__) ) || defined(_M_X64) || defined(__ia64) || defined(_M_IA64) || defined(__aarch64__) || defined(__powerpc64__))
69#define XR_PTR_SIZE 8
70#else
71#define XR_PTR_SIZE 4
72#endif
73
74// Needed so we can use clang __has_feature portably.
75#if !defined(XR_COMPILER_HAS_FEATURE)
76#if defined(__clang__)
77#define XR_COMPILER_HAS_FEATURE(x) __has_feature(x)
78#else
79#define XR_COMPILER_HAS_FEATURE(x) 0
80#endif
81#endif
82
83// Identifies if the current compiler has C++11 support enabled.
84// Does not by itself identify if any given C++11 feature is present.
85#if !defined(XR_CPP11_ENABLED) && defined(__cplusplus)
86#if defined(__GNUC__) && defined(__GXX_EXPERIMENTAL_CXX0X__)
87#define XR_CPP11_ENABLED 1
88#elif defined(_MSC_VER) && (_MSC_VER >= 1600)
89#define XR_CPP11_ENABLED 1
90#elif (__cplusplus >= 201103L) // 201103 is the first C++11 version.
91#define XR_CPP11_ENABLED 1
92#endif
93#endif
94
95// Identifies if the current compiler supports C++11 nullptr.
96#if !defined(XR_CPP_NULLPTR_SUPPORTED)
97#if defined(XR_CPP11_ENABLED) &&                                              \
98    ((defined(__clang__) && XR_COMPILER_HAS_FEATURE(cxx_nullptr)) ||          \
99     (defined(__GNUC__) && (((__GNUC__ * 1000) + __GNUC_MINOR__) >= 4006)) || \
100     (defined(_MSC_VER) && (_MSC_VER >= 1600)) ||                             \
101     (defined(__EDG_VERSION__) && (__EDG_VERSION__ >= 403)))
102#define XR_CPP_NULLPTR_SUPPORTED 1
103#endif
104#endif
105
106#if !defined(XR_CPP_NULLPTR_SUPPORTED)
107#define XR_CPP_NULLPTR_SUPPORTED 0
108#endif  // !defined(XR_CPP_NULLPTR_SUPPORTED)
109
110#ifdef __cplusplus
111}
112#endif
113
114#endif
115
[FILE END]
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