1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
|
/*
* Copyright 2019-2021 Diligent Graphics LLC
* Copyright 2015-2019 Egor Yusov
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* In no event and under no legal theory, whether in tort (including negligence),
* contract, or otherwise, unless required by applicable law (such as deliberate
* and grossly negligent acts) or agreed to in writing, shall any Contributor be
* liable for any damages, including any direct, indirect, special, incidental,
* or consequential damages of any character arising as a result of this License or
* out of the use or inability to use the software (including but not limited to damages
* for loss of goodwill, work stoppage, computer failure or malfunction, or any and
* all other commercial damages or losses), even if such Contributor has been advised
* of the possibility of such damages.
*/
#pragma once
/// \file
/// Alignment utilities
#include <cstdint>
#include "../../Platforms/Basic/interface/DebugUtilities.hpp"
namespace Diligent
{
template <typename T>
bool IsPowerOfTwo(T val)
{
return val > 0 && (val & (val - 1)) == 0;
}
template <typename T1, typename T2>
inline typename std::conditional<sizeof(T1) >= sizeof(T2), T1, T2>::type AlignUp(T1 val, T2 alignment)
{
static_assert(std::is_unsigned<T1>::value == std::is_unsigned<T2>::value, "both types must be signed or unsigned");
static_assert(!std::is_pointer<T1>::value && !std::is_pointer<T2>::value, "types must not be pointers");
VERIFY(IsPowerOfTwo(alignment), "Alignment (", alignment, ") must be power of 2");
using T = typename std::conditional<sizeof(T1) >= sizeof(T2), T1, T2>::type;
return (static_cast<T>(val) + static_cast<T>(alignment - 1)) & ~static_cast<T>(alignment - 1);
}
template <typename PtrType, typename AlignType>
inline PtrType* AlignUp(PtrType* val, AlignType alignment)
{
return reinterpret_cast<PtrType*>(AlignUp(reinterpret_cast<uintptr_t>(val), static_cast<uintptr_t>(alignment)));
}
template <typename T1, typename T2>
inline typename std::conditional<sizeof(T1) >= sizeof(T2), T1, T2>::type AlignDown(T1 val, T2 alignment)
{
static_assert(std::is_unsigned<T1>::value == std::is_unsigned<T2>::value, "both types must be signed or unsigned");
static_assert(!std::is_pointer<T1>::value && !std::is_pointer<T2>::value, "types must not be pointers");
VERIFY(IsPowerOfTwo(alignment), "Alignment (", alignment, ") must be power of 2");
using T = typename std::conditional<sizeof(T1) >= sizeof(T2), T1, T2>::type;
return static_cast<T>(val) & ~static_cast<T>(alignment - 1);
}
template <typename PtrType, typename AlignType>
inline PtrType* AlignDown(PtrType* val, AlignType alignment)
{
return reinterpret_cast<PtrType*>(AlignDown(reinterpret_cast<uintptr_t>(val), static_cast<uintptr_t>(alignment)));
}
} // namespace Diligent
|
