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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 // This file contains the definition of the FencedAllocator class. | 5 // This file contains the definition of the FencedAllocator class. |
6 | 6 |
7 #ifndef GPU_COMMAND_BUFFER_CLIENT_FENCED_ALLOCATOR_H_ | 7 #ifndef GPU_COMMAND_BUFFER_CLIENT_FENCED_ALLOCATOR_H_ |
8 #define GPU_COMMAND_BUFFER_CLIENT_FENCED_ALLOCATOR_H_ | 8 #define GPU_COMMAND_BUFFER_CLIENT_FENCED_ALLOCATOR_H_ |
9 | 9 |
10 #include <stdint.h> | 10 #include <stdint.h> |
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26 // that token. | 26 // that token. |
27 // | 27 // |
28 // NOTE: Although this class is intended to be used in the command buffer | 28 // NOTE: Although this class is intended to be used in the command buffer |
29 // environment which is multi-process, this class isn't "thread safe", because | 29 // environment which is multi-process, this class isn't "thread safe", because |
30 // it isn't meant to be shared across modules. It is thread-compatible though | 30 // it isn't meant to be shared across modules. It is thread-compatible though |
31 // (see http://www.corp.google.com/eng/doc/cpp_primer.html#thread_safety). | 31 // (see http://www.corp.google.com/eng/doc/cpp_primer.html#thread_safety). |
32 class GPU_EXPORT FencedAllocator { | 32 class GPU_EXPORT FencedAllocator { |
33 public: | 33 public: |
34 typedef unsigned int Offset; | 34 typedef unsigned int Offset; |
35 // Invalid offset, returned by Alloc in case of failure. | 35 // Invalid offset, returned by Alloc in case of failure. |
36 static const Offset kInvalidOffset = 0xffffffffU; | 36 enum : Offset { kInvalidOffset = 0xffffffffU }; |
37 | 37 |
38 // Allocation alignment, must be a power of two. | 38 // Allocation alignment, must be a power of two. |
39 static const unsigned int kAllocAlignment = 16; | 39 enum : unsigned int { kAllocAlignment = 16 }; |
40 | 40 |
41 // Creates a FencedAllocator. Note that the size of the buffer is passed, but | 41 // Creates a FencedAllocator. Note that the size of the buffer is passed, but |
42 // not its base address: everything is handled as offsets into the buffer. | 42 // not its base address: everything is handled as offsets into the buffer. |
43 FencedAllocator(unsigned int size, CommandBufferHelper* helper); | 43 FencedAllocator(unsigned int size, CommandBufferHelper* helper); |
44 | 44 |
45 ~FencedAllocator(); | 45 ~FencedAllocator(); |
46 | 46 |
47 // Allocates a block of memory. If the buffer is out of directly available | 47 // Allocates a block of memory. If the buffer is out of directly available |
48 // memory, this function may wait until memory that was freed "pending a | 48 // memory, this function may wait until memory that was freed "pending a |
49 // token" can be re-used. | 49 // token" can be re-used. |
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261 | 261 |
262 private: | 262 private: |
263 FencedAllocator allocator_; | 263 FencedAllocator allocator_; |
264 void* base_; | 264 void* base_; |
265 DISALLOW_IMPLICIT_CONSTRUCTORS(FencedAllocatorWrapper); | 265 DISALLOW_IMPLICIT_CONSTRUCTORS(FencedAllocatorWrapper); |
266 }; | 266 }; |
267 | 267 |
268 } // namespace gpu | 268 } // namespace gpu |
269 | 269 |
270 #endif // GPU_COMMAND_BUFFER_CLIENT_FENCED_ALLOCATOR_H_ | 270 #endif // GPU_COMMAND_BUFFER_CLIENT_FENCED_ALLOCATOR_H_ |
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