typedefs.h

#ifndef TYPEDEFS_H
#define TYPEDEFS_H

#include <stddef.h>
/**
 * Basic definitions and simple functions to be used everywhere..
 */

#ifndef _STR
#define _STR(m_x) #m_x
#define _MKSTR(m_x) _STR(m_x)
#endif

#define VERSION_MAJOR 1
#define VERSION_MINOR 0
#define VERSION_STATUS alpha

#define VERSION_SOFTWARE_NAME "ZyTrax"
#define VERSION_COPYRIGHT "(c) 2019 Juan Linietsky"

#define VERSION_MKSTRING  \
	_MKSTR(VERSION_MAJOR) \
	"." _MKSTR(VERSION_MINOR) "-" _MKSTR(VERSION_STATUS)

#define VERSION_WITH_COPYRIGHT VERSION_SOFTWARE_NAME " v" _MKSTR(VERSION_MAJOR) "." _MKSTR(VERSION_MINOR) "-" _MKSTR(VERSION_STATUS) " " VERSION_COPYRIGHT

#if defined(__GNUC__) && (__GNUC__ >= 4)
#define _FORCE_INLINE_ __attribute__((always_inline)) inline
#define _FORCE_ALIGN_ __attribute__((aligned(16)))

#elif defined(_MSC_VER)
#define _FORCE_INLINE_ __forceinline
#error no idea how to align in MSVC, find out
#else
#define _FORCE_INLINE_ inline
#define _FORCE_ALIGN_
#endif

//custom, gcc-safe offsetof, because gcc complains a lot.
template <class T>
T *_nullptr() {
	T *t = NULL;
	return t;
}

#define OFFSET_OF(st, m) \
	((size_t)((char *)&(_nullptr<st>()->m) - (char *)0))
/**
 * Some platforms (devices) not define NULL
 */

/**
 * Windows defines a lot of badly stuff we'll never ever use. undefine it.
 */

#ifdef _WIN32
#undef min // override standard definition
#undef max // override standard definition
#undef ERROR // override (really stupid) wingdi.h standard definition
#undef DELETE // override (another really stupid) winnt.h standard definition
#undef MessageBox // override winuser.h standard definition
#undef MIN // override standard definition
#undef MAX // override standard definition
#undef CLAMP // override standard definition
#undef Error
#undef OK
#endif

#include "error_list.h"
#include "error_macros.h"

/**
 * Types defined for portability.
 * libSDL uses the same convention, so if libSDL is in use, we just use SDL ones.
 */

#ifdef _MSC_VER

/* Microsoft Visual C doesn't support the C98, C++0x standard types, so redefine them */

typedef signed __int8 int8_t;
typedef unsigned __int8 uint8_t;
typedef signed __int16 int16_t;
typedef unsigned __int16 uint16_t;
typedef signed __int32 int32_t;
typedef unsigned __int32 uint32_t;
typedef signed __int64 int64_t;
typedef unsigned __int64 uint64_t;

#else

#ifdef NO_STDINT_H
typedef unsigned char uint8_t;
typedef signed char int8_t;
typedef unsigned short uint16_t;
typedef signed short int16_t;
typedef unsigned int uint32_t;
typedef signed int int32_t;
typedef long long int64_t;
typedef unsigned long long int64_t;
#else
#include <stdint.h>
#endif

#endif
/** Generic ABS function */

#ifndef ABS
#define ABS(m_v) ((m_v < 0) ? (-(m_v)) : (m_v))
#endif

#ifndef SIGN
#define SIGN(m_v) ((m_v < 0) ? (-1) : (1))
#endif

#ifndef MIN
#define MIN(m_a, m_b) (((m_a) < (m_b)) ? (m_a) : (m_b))
#endif

#ifndef MAX
#define MAX(m_a, m_b) (((m_a) > (m_b)) ? (m_a) : (m_b))
#endif

#ifndef CLAMP
#define CLAMP(m_a, m_min, m_max) (((m_a) < (m_min)) ? (m_min) : (((m_a) > (m_max)) ? m_max : m_a))
#endif

/** Generic swap template */
#ifndef SWAP

#define SWAP(m_x, m_y) __swap_tmpl(m_x, m_y)
template <class T>
inline void __swap_tmpl(T &x, T &y) {

	T aux = x;
	x = y;
	y = aux;
}

#endif //swap

#define HEX2CHR(m_hex) ((m_hex >= '0' && m_hex <= '9') ? (m_hex - '0') :                                        \
														 ((m_hex >= 'A' && m_hex <= 'F') ? (10 + m_hex - 'A') : \
																						   ((m_hex >= 'a' && m_hex <= 'f') ? (10 + m_hex - 'a') : 0)))

/** Function to find the nearest (bigger) power of 2 to an integer */

static inline unsigned int nearest_power_of_2(unsigned int p_number) {

	for (int i = 30; i >= 0; i--) {

		if (p_number & (1 << i))
			return ((p_number == (unsigned int)(1 << i)) ? p_number : (1 << (i + 1)));
	}

	return 0;
}

/** Function to find the nearest (bigger) power of 2 to an integer */

static inline unsigned int nearest_shift(unsigned int p_number) {

	for (int i = 30; i >= 0; i--) {

		if (p_number & (1 << i))
			return i + 1;
	}

	return 0;
}

/** get a shift value from a power of 2 */
static inline int get_shift_from_power_of_2(unsigned int p_pixel) {
	// return a GL_TEXTURE_SIZE_ENUM

	for (unsigned int i = 0; i < 32; i++) {

		if (p_pixel == (unsigned int)(1 << i))
			return i;
	}

	return -1;
}

/** Swap 32 bits value for endianness */
static inline uint32_t BSWAP32(uint32_t x) {
	return ((x << 24) | ((x << 8) & 0x00FF0000) | ((x >> 8) & 0x0000FF00) | (x >> 24));
}

/** When compiling with RTTI, we can add an "extra"
 * layer of safeness in many operations, so dynamic_cast
 * is used besides casting by enum.
 */

template <class T>
struct Comparator {

	inline bool operator()(const T &p_a, const T &p_b) const { return (p_a < p_b); }
};

#define __STRX(m_index) #m_index
#define __STR(m_index) __STRX(m_index)

#endif /* typedefs.h */