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raze/source/build/include/compat.h
Christoph Oelckers 8114309e89 - compat.h cleanup. 
* use static_assert directly. Raze is C++17, no need for that macro shit.
* removed CONSTEXPR - I seriously fail to see the use here, many of the functions marked as CONSTEXPR cannot possibly even be constant evaluated so the declaration makes no sense. Removed most of these and replaced the valid ones with the official constexpr keyword.
* got rid of EDUKE_PREDICT_FALSE - this makes zero sense in script parsing code, at best it will save a few microseconds. Clean code wins.
* replaced Blrintf with xs_CRoundToInt. Shitty name is shitty name, even if derived from POSIX.
* replaced Bstr*casecmp with str*icmp. As these get defined in the CMake project based on actual compiler checks they are preferable here.
* removed lots of other stuff that is not needed with a minimum compiler requirement of C++17.
2020-09-04 21:24:48 +02:00

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// Compatibility declarations for things which might not be present in
// certain build environments. It also levels the playing field caused
// by different platforms.
#ifndef compat_h_
#define compat_h_
#pragma once
#include "xs_Float.h"
#include "m_alloc.h"
#include "intvec.h"
#include "m_swap.h"
////////// Compiler detection //////////
#ifdef __GNUC__
# define EDUKE32_GCC_PREREQ(major, minor) (major < __GNUC__ || (major == __GNUC__ && minor <= __GNUC_MINOR__))
#else
# define EDUKE32_GCC_PREREQ(major, minor) 0
#endif
#ifdef __clang__
# define EDUKE32_CLANG_PREREQ(major, minor) (major < __clang_major__ || (major == __clang_major__ && minor <= __clang_minor__))
#else
# define EDUKE32_CLANG_PREREQ(major, minor) 0
#endif
#ifndef __has_builtin
# define __has_builtin(x) 0 // Compatibility with non-clang compilers.
#endif
#ifndef __has_feature
# define __has_feature(x) 0 // Compatibility with non-clang compilers.
#endif
#ifndef __has_extension
# define __has_extension __has_feature // Compatibility with pre-3.0 compilers.
#endif
#ifndef __has_cpp_attribute
# define __has_cpp_attribute(x) 0
#endif
#ifdef _MSC_VER
# define EDUKE32_MSVC_PREREQ(major) ((major) <= (_MSC_VER))
# ifdef __cplusplus
# define EDUKE32_MSVC_CXX_PREREQ(major) ((major) <= (_MSC_VER))
# else
# define EDUKE32_MSVC_CXX_PREREQ(major) 0
# endif
#else
# define EDUKE32_MSVC_PREREQ(major) 0
# define EDUKE32_MSVC_CXX_PREREQ(major) 0
#endif
////////// Language detection //////////
#if defined __STDC__
# if defined __STDC_VERSION__ && __STDC_VERSION__ >= 201112L
# define CSTD 2011
# elif defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L
# define CSTD 1999
# elif defined __STDC_VERSION__ && __STDC_VERSION__ >= 199409L
# define CSTD 1994
# else
# define CSTD 1989
# endif
#else
# define CSTD 0
#endif
#if defined __cplusplus && __cplusplus >= 201703L
# define CXXSTD 2017
#elif defined __cplusplus && __cplusplus >= 201402L
# define CXXSTD 2014
#elif defined __cplusplus && __cplusplus >= 201103L
# define CXXSTD 2011
#elif defined __cplusplus && __cplusplus >= 199711L
# define CXXSTD 2014 // Thanks, Microsoft... :?
#else
# define CXXSTD 0
#endif
////////// Language and compiler feature polyfills //////////
# define EXTERNC
#ifndef UNREFERENCED_PARAMETER
# define UNREFERENCED_PARAMETER(x) (x) = (x)
#endif
#ifndef UNREFERENCED_CONST_PARAMETER
# ifdef _MSC_VER
# define UNREFERENCED_CONST_PARAMETER(x) ((void)(x))
# else
# define UNREFERENCED_CONST_PARAMETER(x)
# endif
#endif
#if defined __GNUC__ || defined __clang__
# define ATTRIBUTE(attrlist) __attribute__(attrlist)
#else
# define ATTRIBUTE(attrlist)
#endif
#ifndef MAY_ALIAS
# ifdef _MSC_VER
# define MAY_ALIAS
# else
# define MAY_ALIAS __attribute__((may_alias))
# endif
#endif
#ifndef FORCE_INLINE
# ifdef _MSC_VER
# define FORCE_INLINE __forceinline
# else
# ifdef __GNUC__
# define FORCE_INLINE inline __attribute__((always_inline))
# else
# define FORCE_INLINE inline
# endif
# endif
#endif
#if EDUKE32_GCC_PREREQ(2,0) || defined _MSC_VER
# define EDUKE32_FUNCTION __FUNCTION__
#elif CSTD >= 1999 || CXXSTD >= 2011
# define EDUKE32_FUNCTION __func__
#else
# define EDUKE32_FUNCTION "???"
#endif
#if CXXSTD >= 2011
# if __has_cpp_attribute(fallthrough)
# define fallthrough__ [[fallthrough]]
# elif __has_cpp_attribute(clang::fallthrough)
# define fallthrough__ [[clang::fallthrough]]
# elif __has_cpp_attribute(gnu::fallthrough)
# define fallthrough__ [[gnu::fallthrough]]
# endif
#endif
#ifndef fallthrough__
# if !defined __clang__ && EDUKE32_GCC_PREREQ(7,0)
# define fallthrough__ __attribute__((fallthrough))
# elif defined _MSC_VER
# define fallthrough__ __fallthrough
# else
# define fallthrough__
# endif
#endif
////////// Architecture detection //////////
#ifdef WORDS_BIGENDIAN
# define B_LITTLE_ENDIAN 0
# define B_BIG_ENDIAN 1
#else
# define B_LITTLE_ENDIAN 1
# define B_BIG_ENDIAN 0
#endif
////////// Standard library headers //////////
#undef __USE_MINGW_ANSI_STDIO // Workaround for MinGW-w64.
#ifndef __STDC_FORMAT_MACROS
# define __STDC_FORMAT_MACROS
#endif
#ifndef __STDC_LIMIT_MACROS
# define __STDC_LIMIT_MACROS
#endif
#ifndef _USE_MATH_DEFINES
# define _USE_MATH_DEFINES
#endif
#include <inttypes.h>
#include <stdint.h>
#include <limits.h>
#include <stdarg.h>
#include <stddef.h>
#ifndef USE_PHYSFS
#include <stdio.h>
#endif
#include <stdlib.h>
#include <string.h>
#if !(defined _WIN32 && defined __clang__)
#include <float.h>
#endif
#include <math.h>
#include <ctype.h>
#include <errno.h>
#include <time.h>
#include <assert.h>
#ifdef __cplusplus
# include <limits>
# if CXXSTD >= 2011 || EDUKE32_MSVC_PREREQ(1800)
# include <algorithm>
# include <functional>
# include <type_traits>
// we need this because MSVC does not properly identify C++11 support
# define HAVE_CXX11_HEADERS
# endif
#endif
////////// Platform headers //////////
#if !defined __APPLE__ && (!defined EDUKE32_BSD || !__STDC__)
# include <malloc.h>
#endif
#ifndef USE_PHYSFS
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/types.h>
#if defined(_WIN32)
# include <direct.h>
# include <io.h>
#else
# include <unistd.h>
#endif
#endif
#include "engineerrors.h"
////////// DEPRECATED: Standard library prefixing //////////
typedef intptr_t ssize_t;
typedef size_t bsize_t;
typedef ssize_t bssize_t;
#define BMAX_PATH 256
#define Bstrcpy strcpy
#define Bstrncpy strncpy
#define Bstrcmp strcmp
#define Bstrncmp strncmp
#define Bstrcat strcat
#define Bstrncat strncat
#define Bstrlen strlen
#define Bstrchr strchr
#define Bstrrchr strrchr
#define Bstrtol strtol
#define Bstrtoul strtoul
#define Bstrtod strtod
#define Bstrstr strstr
#define Bmemcpy memcpy
#define Bmemset memset
////////// Standard library wrappers //////////
#if defined(__arm__)
# define Bsqrtf __builtin_sqrtf
#else
# define Bsqrtf sqrtf
#endif
////////// Metaprogramming structs //////////
# if CXXSTD >= 2014
using std::enable_if_t;
# elif defined HAVE_CXX11_HEADERS
template <bool B, class T = void>
using enable_if_t = typename std::enable_if<B, T>::type;
# endif
using native_t = intptr_t;
typedef struct MAY_ALIAS {
int32_t x, y;
} vec2_t;
typedef struct {
uint32_t x, y;
} vec2u_t;
typedef struct {
float x, y;
} vec2f_t;
typedef struct {
double x, y;
} vec2d_t;
typedef struct MAY_ALIAS {
union {
struct { int32_t x, y, z; };
vec2_t vec2;
};
} vec3_t;
typedef struct MAY_ALIAS {
union {
struct { int16_t x, y, z; };
vec2_16_t vec2;
};
} vec3_16_t;
typedef struct {
union {
struct {
union { float x, d; };
union { float y, u; };
union { float z, v; };
};
vec2f_t vec2;
};
} vec3f_t;
static_assert(sizeof(vec3f_t) == sizeof(float) * 3);
typedef struct {
union { double x; double d; };
union { double y; double u; };
union { double z; double v; };
} vec3d_t;
static_assert(sizeof(vec3d_t) == sizeof(double) * 3);
////////// Language tricks that depend on size_t //////////
#include "basics.h"
# define ARRAY_SIZE(arr) countof(arr)
////////// Pointer management //////////
#define DO_FREE_AND_NULL(var) do { \
Xfree(var); (var) = NULL; \
} while (0)
////////// Data serialization //////////
inline int32_t B_LITTLE32(int32_t val) { return LittleLong(val); }
inline uint32_t B_LITTLE32(uint32_t val) { return LittleLong(val); }
inline int32_t B_LITTLE16(int16_t val) { return LittleShort(val); }
inline uint32_t B_LITTLE16(uint16_t val) { return LittleShort(val); }
static FORCE_INLINE void B_BUF32(void * const buf, uint32_t const x) { *(uint32_t *) buf = x; }
static FORCE_INLINE uint32_t B_UNBUF32(void const * const buf) { return *(uint32_t const *) buf; }
static FORCE_INLINE uint16_t B_UNBUF16(void const * const buf) { return *(uint16_t const *) buf; }
////////// Abstract data operations //////////
template <typename T, typename X, typename Y> constexpr T clamp(T in, X min, Y max) { return in <= (T) min ? (T) min : (in >= (T) max ? (T) max : in); }
template <typename T, typename X, typename Y> constexpr T clamp2(T in, X min, Y max) { return in >= (T) max ? (T) max : (in <= (T) min ? (T) min : in); }
using std::min;
using std::max;
////////// Bitfield manipulation //////////
// This once was a static array, requiring a memory acces where a shift would suffice.
// Revert the above to a real bit shift through some C++ operator magic. That saves me from reverting all the code that uses this construct.
// Note: Only occurs 25 times in the code, should be removed for good.
static struct
{
constexpr uint8_t operator[](int index) const { return 1 << index; };
} pow2char;
static FORCE_INLINE void bitmap_set(uint8_t *const ptr, int const n) { ptr[n>>3] |= pow2char[n&7]; }
static FORCE_INLINE void bitmap_clear(uint8_t *const ptr, int const n) { ptr[n>>3] &= ~pow2char[n&7]; }
static FORCE_INLINE char bitmap_test(uint8_t const *const ptr, int const n) { return ptr[n>>3] & pow2char[n&7]; }
////////// Utility functions //////////
// breadth-first search helpers
template <typename T>
void bfirst_search_init(T *const list, uint8_t *const bitmap, T *const eltnumptr, int const maxelts, int const firstelt)
{
Bmemset(bitmap, 0, (maxelts+7)>>3);
list[0] = firstelt;
bitmap_set(bitmap, firstelt);
*eltnumptr = 1;
}
template <typename T>
void bfirst_search_try(T *const list, uint8_t *const bitmap, T *const eltnumptr, int const elt)
{
if (!bitmap_test(bitmap, elt))
{
bitmap_set(bitmap, elt);
list[(*eltnumptr)++] = elt;
}
}
// Copy min(strlen(src)+1, n) characters into dst, always terminate with a NUL.
static FORCE_INLINE char *Bstrncpyz(char *dst, const char *src, bsize_t n)
{
Bstrncpy(dst, src, n);
dst[n-1] = 0;
return dst;
}
////////// PANICKING ALLOCATION WRAPPERS //////////
#define Xstrdup(s) (strdup(s))
#define Xmalloc(size) (M_Malloc(size))
#define Xcalloc(nmemb, size) (M_Calloc(nmemb, size))
#define Xrealloc(ptr, size) (M_Realloc(ptr, size))
#define Xfree(ptr) (M_Free(ptr))
////////// Inlined external libraries //////////
#include "m_fixed.h"
#include "vectors.h"
inline FVector3 GetSoundPos(const vec3_t *pos)
{
// converts a Build coordinate to a sound system coordinate
const float xmul = 1 / 16.f;
const float ymul = -1 / 16.f;
const float zmul = -1 / 256.f;
return { pos->x* xmul, pos->z* zmul, pos->y* ymul };
}
/* End dependence on compat.o object. */
////////// EDuke32-specific features //////////
#ifndef TRUE
# define TRUE 1
#endif
#ifndef FALSE
# define FALSE 0
#endif
#endif // compat_h_
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