[5] | 1 | /* |
---|
| 2 | ----------------------------------------------------------------------------- |
---|
| 3 | This source file is part of OGRE |
---|
| 4 | (Object-oriented Graphics Rendering Engine) |
---|
| 5 | For the latest info, see http://www.ogre3d.org/ |
---|
| 6 | |
---|
| 7 | Copyright (c) 2000-2006 Torus Knot Software Ltd |
---|
| 8 | Also see acknowledgements in Readme.html |
---|
| 9 | |
---|
| 10 | This program is free software; you can redistribute it and/or modify it under |
---|
| 11 | the terms of the GNU Lesser General Public License as published by the Free Software |
---|
| 12 | Foundation; either version 2 of the License, or (at your option) any later |
---|
| 13 | version. |
---|
| 14 | |
---|
| 15 | This program is distributed in the hope that it will be useful, but WITHOUT |
---|
| 16 | ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS |
---|
| 17 | FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. |
---|
| 18 | |
---|
| 19 | You should have received a copy of the GNU Lesser General Public License along with |
---|
| 20 | this program; if not, write to the Free Software Foundation, Inc., 59 Temple |
---|
| 21 | Place - Suite 330, Boston, MA 02111-1307, USA, or go to |
---|
| 22 | http://www.gnu.org/copyleft/lesser.txt. |
---|
| 23 | |
---|
| 24 | You may alternatively use this source under the terms of a specific version of |
---|
| 25 | the OGRE Unrestricted License provided you have obtained such a license from |
---|
| 26 | Torus Knot Software Ltd. |
---|
| 27 | ----------------------------------------------------------------------------- |
---|
| 28 | */ |
---|
| 29 | #include "OgreStableHeaders.h" |
---|
| 30 | |
---|
| 31 | #include "OgreAlignedAllocator.h" |
---|
| 32 | |
---|
| 33 | #include "OgrePlatformInformation.h" |
---|
| 34 | #include "OgreBitwise.h" |
---|
| 35 | |
---|
| 36 | /** |
---|
| 37 | * |
---|
| 38 | * |___2___|3|_________5__________|__6__| |
---|
| 39 | * ^ ^ |
---|
| 40 | * 1 4 |
---|
| 41 | * |
---|
| 42 | * 1 -> Pointer to start of the block allocated by new. |
---|
| 43 | * 2 -> Gap used to get 4 aligned on given alignment |
---|
| 44 | * 3 -> Byte offset between 1 and 4 |
---|
| 45 | * 4 -> Pointer to the start of data block. |
---|
| 46 | * 5 -> Data block. |
---|
| 47 | * 6 -> Wasted memory at rear of data block. |
---|
| 48 | */ |
---|
| 49 | |
---|
| 50 | namespace Ogre { |
---|
| 51 | |
---|
| 52 | //--------------------------------------------------------------------- |
---|
| 53 | void* AlignedMemory::allocate(size_t size, size_t alignment) |
---|
| 54 | { |
---|
| 55 | assert(0 < alignment && alignment <= 128 && Bitwise::isPO2(alignment)); |
---|
| 56 | |
---|
| 57 | unsigned char* p = new unsigned char[size + alignment]; |
---|
| 58 | size_t offset = alignment - (size_t(p) & (alignment-1)); |
---|
| 59 | |
---|
| 60 | unsigned char* result = p + offset; |
---|
| 61 | result[-1] = (unsigned char)offset; |
---|
| 62 | |
---|
| 63 | return result; |
---|
| 64 | } |
---|
| 65 | //--------------------------------------------------------------------- |
---|
| 66 | void* AlignedMemory::allocate(size_t size) |
---|
| 67 | { |
---|
| 68 | return allocate(size, OGRE_SIMD_ALIGNMENT); |
---|
| 69 | } |
---|
| 70 | //--------------------------------------------------------------------- |
---|
| 71 | void AlignedMemory::deallocate(void* p) |
---|
| 72 | { |
---|
| 73 | if (p) |
---|
| 74 | { |
---|
| 75 | unsigned char* mem = (unsigned char*)p; |
---|
| 76 | mem = mem - mem[-1]; |
---|
| 77 | delete [] mem; |
---|
| 78 | } |
---|
| 79 | } |
---|
| 80 | |
---|
| 81 | } |
---|