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https://github.com/baldurk/renderdoc.git
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baldurk
768e812e45
* On windows it's strongly desired to be able to compile straight out of a clean checkout or source download. This means anyone can download the source and investigate something quickly, without having to worry about the hassle of figuring out how the project downloads 3rd party dependencies, fetching them, getting them registered in the right place. * This can't be put in a submodule as git submodules don't get downloaded by default so people new to git will get confusing compilation messages, and someone downloading the source from github directly without cloning via git won't get submodules included. * It does add some extra size to a fresh download/checkout which is unfortunate, but absolutely worth the cost. Shallow checkouts still aren't unfeasibly large, and it's only a one-off cost at clone time.
273 lines
8.9 KiB
C++
273 lines
8.9 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2016 The Qt Company Ltd.
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** Copyright (C) 2016 Intel Corporation.
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** Contact: https://www.qt.io/licensing/
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**
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** This file is part of the QtCore module of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
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** and conditions see https://www.qt.io/terms-conditions. For further
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** information use the contact form at https://www.qt.io/contact-us.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 3 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL3 included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU Lesser General Public License version 3 requirements
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** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 2.0 or (at your option) the GNU General
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** Public license version 3 or any later version approved by the KDE Free
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** Qt Foundation. The licenses are as published by the Free Software
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** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
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** included in the packaging of this file. Please review the following
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** information to ensure the GNU General Public License requirements will
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** be met: https://www.gnu.org/licenses/gpl-2.0.html and
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** https://www.gnu.org/licenses/gpl-3.0.html.
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#ifndef QENDIAN_H
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#define QENDIAN_H
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#include <QtCore/qglobal.h>
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// include stdlib.h and hope that it defines __GLIBC__ for glibc-based systems
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#include <stdlib.h>
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#include <string.h>
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QT_BEGIN_NAMESPACE
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/*
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* ENDIAN FUNCTIONS
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*/
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inline void qbswap_helper(const void *src, void *dest, int size)
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{
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for (int i = 0; i < size ; ++i)
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static_cast<uchar *>(dest)[i] = static_cast<const uchar *>(src)[size - 1 - i];
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}
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/*
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* qbswap(const T src, const void *dest);
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* Changes the byte order of \a src from big endian to little endian or vice versa
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* and stores the result in \a dest.
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* There is no alignment requirements for \a dest.
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*/
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template <typename T> inline void qbswap(const T src, void *dest)
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{
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qbswap_helper(&src, dest, sizeof(T));
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}
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// Used to implement a type-safe and alignment-safe copy operation
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// If you want to avoid the memcpy, you must write specializations for these functions
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template <typename T> Q_ALWAYS_INLINE void qToUnaligned(const T src, void *dest)
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{
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// Using sizeof(T) inside memcpy function produces internal compiler error with
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// MSVC2008/ARM in tst_endian -> use extra indirection to resolve size of T.
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const size_t size = sizeof(T);
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#if QT_HAS_BUILTIN(__builtin_memcpy)
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__builtin_memcpy
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#else
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memcpy
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#endif
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(dest, &src, size);
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}
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template <typename T> Q_ALWAYS_INLINE T qFromUnaligned(const void *src)
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{
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T dest;
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const size_t size = sizeof(T);
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#if QT_HAS_BUILTIN(__builtin_memcpy)
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__builtin_memcpy
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#else
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memcpy
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#endif
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(&dest, src, size);
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return dest;
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}
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/*
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* T qbswap(T source).
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* Changes the byte order of a value from big endian to little endian or vice versa.
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* This function can be used if you are not concerned about alignment issues,
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* and it is therefore a bit more convenient and in most cases more efficient.
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*/
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template <typename T> T qbswap(T source);
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// GCC 4.3 implemented all the intrinsics, but the 16-bit one only got implemented in 4.8;
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// Clang 2.6 implemented the 32- and 64-bit but waited until 3.2 to implement the 16-bit one
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#if (defined(Q_CC_GNU) && Q_CC_GNU >= 403) || QT_HAS_BUILTIN(__builtin_bswap32)
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template <> inline quint64 qbswap<quint64>(quint64 source)
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{
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return __builtin_bswap64(source);
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}
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template <> inline quint32 qbswap<quint32>(quint32 source)
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{
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return __builtin_bswap32(source);
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}
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template <> inline void qbswap<quint64>(quint64 source, void *dest)
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{
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qToUnaligned<quint64>(__builtin_bswap64(source), dest);
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}
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template <> inline void qbswap<quint32>(quint32 source, void *dest)
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{
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qToUnaligned<quint32>(__builtin_bswap32(source), dest);
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}
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#else
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template <> inline quint64 qbswap<quint64>(quint64 source)
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{
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return 0
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| ((source & Q_UINT64_C(0x00000000000000ff)) << 56)
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| ((source & Q_UINT64_C(0x000000000000ff00)) << 40)
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| ((source & Q_UINT64_C(0x0000000000ff0000)) << 24)
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| ((source & Q_UINT64_C(0x00000000ff000000)) << 8)
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| ((source & Q_UINT64_C(0x000000ff00000000)) >> 8)
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| ((source & Q_UINT64_C(0x0000ff0000000000)) >> 24)
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| ((source & Q_UINT64_C(0x00ff000000000000)) >> 40)
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| ((source & Q_UINT64_C(0xff00000000000000)) >> 56);
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}
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template <> inline quint32 qbswap<quint32>(quint32 source)
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{
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return 0
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| ((source & 0x000000ff) << 24)
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| ((source & 0x0000ff00) << 8)
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| ((source & 0x00ff0000) >> 8)
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| ((source & 0xff000000) >> 24);
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}
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#endif // GCC & Clang intrinsics
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#if (defined(Q_CC_GNU) && Q_CC_GNU >= 408) || QT_HAS_BUILTIN(__builtin_bswap16)
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template <> inline quint16 qbswap<quint16>(quint16 source)
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{
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return __builtin_bswap16(source);
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}
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template <> inline void qbswap<quint16>(quint16 source, void *dest)
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{
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qToUnaligned<quint16>(__builtin_bswap16(source), dest);
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}
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#else
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template <> inline quint16 qbswap<quint16>(quint16 source)
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{
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return quint16( 0
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| ((source & 0x00ff) << 8)
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| ((source & 0xff00) >> 8) );
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}
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#endif // GCC & Clang intrinsics
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// signed specializations
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template <> inline qint64 qbswap<qint64>(qint64 source)
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{
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return qbswap<quint64>(quint64(source));
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}
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template <> inline qint32 qbswap<qint32>(qint32 source)
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{
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return qbswap<quint32>(quint32(source));
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}
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template <> inline qint16 qbswap<qint16>(qint16 source)
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{
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return qbswap<quint16>(quint16(source));
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}
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template <> inline void qbswap<qint64>(qint64 source, void *dest)
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{
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qbswap<quint64>(quint64(source), dest);
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}
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template <> inline void qbswap<qint32>(qint32 source, void *dest)
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{
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qbswap<quint32>(quint32(source), dest);
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}
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template <> inline void qbswap<qint16>(qint16 source, void *dest)
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{
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qbswap<quint16>(quint16(source), dest);
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}
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#if Q_BYTE_ORDER == Q_BIG_ENDIAN
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template <typename T> inline T qToBigEndian(T source)
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{ return source; }
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template <typename T> inline T qFromBigEndian(T source)
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{ return source; }
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template <typename T> inline T qToLittleEndian(T source)
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{ return qbswap<T>(source); }
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template <typename T> inline T qFromLittleEndian(T source)
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{ return qbswap<T>(source); }
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template <typename T> inline void qToBigEndian(T src, void *dest)
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{ qToUnaligned<T>(src, dest); }
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template <typename T> inline void qToLittleEndian(T src, void *dest)
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{ qbswap<T>(src, dest); }
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#else // Q_LITTLE_ENDIAN
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template <typename T> inline T qToBigEndian(T source)
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{ return qbswap<T>(source); }
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template <typename T> inline T qFromBigEndian(T source)
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{ return qbswap<T>(source); }
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template <typename T> inline T qToLittleEndian(T source)
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{ return source; }
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template <typename T> inline T qFromLittleEndian(T source)
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{ return source; }
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template <typename T> inline void qToBigEndian(T src, void *dest)
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{ qbswap<T>(src, dest); }
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template <typename T> inline void qToLittleEndian(T src, void *dest)
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{ qToUnaligned<T>(src, dest); }
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#endif // Q_BYTE_ORDER == Q_BIG_ENDIAN
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template <> inline quint8 qbswap<quint8>(quint8 source)
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{
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return source;
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}
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template <> inline qint8 qbswap<qint8>(qint8 source)
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{
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return source;
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}
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/* T qFromLittleEndian(const void *src)
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* This function will read a little-endian encoded value from \a src
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* and return the value in host-endian encoding.
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* There is no requirement that \a src must be aligned.
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*/
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template <typename T> inline T qFromLittleEndian(const void *src)
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{
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return qFromLittleEndian(qFromUnaligned<T>(src));
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}
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template <> inline quint8 qFromLittleEndian<quint8>(const void *src)
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{ return static_cast<const quint8 *>(src)[0]; }
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template <> inline qint8 qFromLittleEndian<qint8>(const void *src)
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{ return static_cast<const qint8 *>(src)[0]; }
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/* This function will read a big-endian (also known as network order) encoded value from \a src
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* and return the value in host-endian encoding.
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* There is no requirement that \a src must be aligned.
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*/
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template <class T> inline T qFromBigEndian(const void *src)
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{
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return qFromBigEndian(qFromUnaligned<T>(src));
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}
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template <> inline quint8 qFromBigEndian<quint8>(const void *src)
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{ return static_cast<const quint8 *>(src)[0]; }
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template <> inline qint8 qFromBigEndian<qint8>(const void *src)
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{ return static_cast<const qint8 *>(src)[0]; }
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QT_END_NAMESPACE
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#endif // QENDIAN_H
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