22358babda
This implement branch prediction macros likely() and unlikely() like in Linux. When using these macros please ensure that when you use them the condition in the branch really is very, very likely or unlikely. Think 90+% of the time. Primarily useful for error checking. (And I implement these macros for all our error checking macros now) See this article for more information: https://kernelnewbies.org/FAQ/LikelyUnlikely There are more places where these macros may make sense in renderer and physics engine. Placing them will come in another commit down the line.
302 lines
8.2 KiB
C++
302 lines
8.2 KiB
C++
/*************************************************************************/
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/* typedefs.h */
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/*************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* https://godotengine.org */
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/*************************************************************************/
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/* Copyright (c) 2007-2017 Juan Linietsky, Ariel Manzur. */
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/* Copyright (c) 2014-2017 Godot Engine contributors (cf. AUTHORS.md) */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/*************************************************************************/
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#ifndef TYPEDEFS_H
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#define TYPEDEFS_H
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#include <stddef.h>
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/**
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* Basic definitions and simple functions to be used everywhere..
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*/
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#include "platform_config.h"
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#ifndef _STR
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#define _STR(m_x) #m_x
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#define _MKSTR(m_x) _STR(m_x)
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#endif
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#ifndef _ALWAYS_INLINE_
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#if defined(__GNUC__) && (__GNUC__ >= 4)
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#define _ALWAYS_INLINE_ __attribute__((always_inline)) inline
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#elif defined(__llvm__)
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#define _ALWAYS_INLINE_ __attribute__((always_inline)) inline
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#elif defined(_MSC_VER)
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#define _ALWAYS_INLINE_ __forceinline
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#else
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#define _ALWAYS_INLINE_ inline
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#endif
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#endif
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#ifndef _FORCE_INLINE_
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#ifdef DEBUG_ENABLED
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#define _FORCE_INLINE_ inline
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#else
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#define _FORCE_INLINE_ _ALWAYS_INLINE_
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#endif
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#endif
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//custom, gcc-safe offsetof, because gcc complains a lot.
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template <class T>
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T *_nullptr() {
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T *t = NULL;
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return t;
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}
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#define OFFSET_OF(st, m) \
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((size_t)((char *)&(_nullptr<st>()->m) - (char *)0))
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/**
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* Some platforms (devices) not define NULL
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*/
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#ifndef NULL
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#define NULL 0
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#endif
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/**
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* Windows defines a lot of badly stuff we'll never ever use. undefine it.
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*/
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#ifdef _WIN32
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#undef min // override standard definition
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#undef max // override standard definition
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#undef ERROR // override (really stupid) wingdi.h standard definition
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#undef DELETE // override (another really stupid) winnt.h standard definition
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#undef MessageBox // override winuser.h standard definition
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#undef MIN // override standard definition
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#undef MAX // override standard definition
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#undef CLAMP // override standard definition
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#undef Error
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#undef OK
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#endif
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#include "error_list.h"
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#include "error_macros.h"
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#include "int_types.h"
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/** Generic ABS function, for math uses please use Math::abs */
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#ifndef ABS
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#define ABS(m_v) ((m_v < 0) ? (-(m_v)) : (m_v))
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#endif
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#ifndef SGN
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#define SGN(m_v) ((m_v < 0) ? (-1.0) : (+1.0))
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#endif
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#ifndef MIN
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#define MIN(m_a, m_b) (((m_a) < (m_b)) ? (m_a) : (m_b))
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#endif
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#ifndef MAX
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#define MAX(m_a, m_b) (((m_a) > (m_b)) ? (m_a) : (m_b))
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#endif
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#ifndef CLAMP
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#define CLAMP(m_a, m_min, m_max) (((m_a) < (m_min)) ? (m_min) : (((m_a) > (m_max)) ? m_max : m_a))
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#endif
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/** Generic swap template */
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#ifndef SWAP
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#define SWAP(m_x, m_y) __swap_tmpl(m_x, m_y)
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template <class T>
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inline void __swap_tmpl(T &x, T &y) {
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T aux = x;
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x = y;
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y = aux;
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}
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#endif //swap
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/* clang-format off */
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#define HEX2CHR(m_hex) \
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((m_hex >= '0' && m_hex <= '9') ? (m_hex - '0') : \
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((m_hex >= 'A' && m_hex <= 'F') ? (10 + m_hex - 'A') : \
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((m_hex >= 'a' && m_hex <= 'f') ? (10 + m_hex - 'a') : 0)))
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/* clang-format on */
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// Macro to check whether we are compiled by clang
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// and we have a specific builtin
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#if defined(__llvm__) && defined(__has_builtin)
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#define _llvm_has_builtin(x) __has_builtin(x)
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#else
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#define _llvm_has_builtin(x) 0
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#endif
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#if (defined(__GNUC__) && (__GNUC__ >= 5)) || _llvm_has_builtin(__builtin_mul_overflow)
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#define _mul_overflow __builtin_mul_overflow
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#endif
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#if (defined(__GNUC__) && (__GNUC__ >= 5)) || _llvm_has_builtin(__builtin_add_overflow)
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#define _add_overflow __builtin_add_overflow
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#endif
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/** Function to find the next power of 2 to an integer */
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static _FORCE_INLINE_ unsigned int next_power_of_2(unsigned int x) {
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--x;
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x |= x >> 1;
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x |= x >> 2;
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x |= x >> 4;
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x |= x >> 8;
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x |= x >> 16;
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return ++x;
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}
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static _FORCE_INLINE_ unsigned int previous_power_of_2(unsigned int x) {
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x |= x >> 1;
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x |= x >> 2;
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x |= x >> 4;
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x |= x >> 8;
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x |= x >> 16;
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return x - (x >> 1);
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}
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static _FORCE_INLINE_ unsigned int closest_power_of_2(unsigned int x) {
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unsigned int nx = next_power_of_2(x);
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unsigned int px = previous_power_of_2(x);
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return (nx - x) > (x - px) ? px : nx;
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}
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// We need this definition inside the function below.
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static inline int get_shift_from_power_of_2(unsigned int p_pixel);
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template <class T>
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static _FORCE_INLINE_ T nearest_power_of_2_templated(T x) {
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--x;
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// The number of operations on x is the base two logarithm
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// of the p_number of bits in the type. Add three to account
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// for sizeof(T) being in bytes.
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size_t num = get_shift_from_power_of_2(sizeof(T)) + 3;
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// If the compiler is smart, it unrolls this loop
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// If its dumb, this is a bit slow.
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for (size_t i = 0; i < num; i++)
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x |= x >> (1 << i);
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return ++x;
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}
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/** Function to find the nearest (bigger) power of 2 to an integer */
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static inline unsigned int nearest_shift(unsigned int p_number) {
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for (int i = 30; i >= 0; i--) {
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if (p_number & (1 << i))
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return i + 1;
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}
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return 0;
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}
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/** get a shift value from a power of 2 */
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static inline int get_shift_from_power_of_2(unsigned int p_pixel) {
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// return a GL_TEXTURE_SIZE_ENUM
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for (unsigned int i = 0; i < 32; i++) {
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if (p_pixel == (unsigned int)(1 << i))
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return i;
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}
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return -1;
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}
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/** Swap 16 bits value for endianness */
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static inline uint16_t BSWAP16(uint16_t x) {
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return (x >> 8) | (x << 8);
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}
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/** Swap 32 bits value for endianness */
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static inline uint32_t BSWAP32(uint32_t x) {
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return ((x << 24) | ((x << 8) & 0x00FF0000) | ((x >> 8) & 0x0000FF00) | (x >> 24));
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}
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/** Swap 64 bits value for endianness */
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static inline uint64_t BSWAP64(uint64_t x) {
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x = (x & 0x00000000FFFFFFFF) << 32 | (x & 0xFFFFFFFF00000000) >> 32;
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x = (x & 0x0000FFFF0000FFFF) << 16 | (x & 0xFFFF0000FFFF0000) >> 16;
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x = (x & 0x00FF00FF00FF00FF) << 8 | (x & 0xFF00FF00FF00FF00) >> 8;
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return x;
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}
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/** When compiling with RTTI, we can add an "extra"
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* layer of safeness in many operations, so dynamic_cast
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* is used besides casting by enum.
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*/
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template <class T>
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struct Comparator {
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inline bool operator()(const T &p_a, const T &p_b) const { return (p_a < p_b); }
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};
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void _global_lock();
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void _global_unlock();
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struct _GlobalLock {
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_GlobalLock() { _global_lock(); }
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~_GlobalLock() { _global_unlock(); }
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};
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#define GLOBAL_LOCK_FUNCTION _GlobalLock _global_lock_;
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#ifdef NO_SAFE_CAST
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#define SAFE_CAST static_cast
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#else
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#define SAFE_CAST dynamic_cast
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#endif
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#define MT_SAFE
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#define __STRX(m_index) #m_index
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#define __STR(m_index) __STRX(m_index)
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#ifdef __GNUC__
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#define likely(x) __builtin_expect(!!(x), 1)
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#define unlikely(x) __builtin_expect(!!(x), 0)
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#else
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#define likely(x) x
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#define unlikely(x) x
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#endif
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#endif /* typedefs.h */
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