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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2011 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 IdAllocator class. | 5 // This file contains the definition of the IdAllocator class. |
6 | 6 |
7 #ifndef GPU_COMMAND_BUFFER_CLIENT_ID_ALLOCATOR_H_ | 7 #ifndef GPU_COMMAND_BUFFER_CLIENT_ID_ALLOCATOR_H_ |
8 #define GPU_COMMAND_BUFFER_CLIENT_ID_ALLOCATOR_H_ | 8 #define GPU_COMMAND_BUFFER_CLIENT_ID_ALLOCATOR_H_ |
9 | 9 |
10 #include <set> | 10 #include <set> |
11 #include <utility> | 11 #include <utility> |
12 | 12 |
13 #include "base/compiler_specific.h" | 13 #include "base/compiler_specific.h" |
14 | 14 |
15 #include "../../gpu_export.h" | |
16 #include "../common/types.h" | 15 #include "../common/types.h" |
17 | 16 |
18 namespace gpu { | 17 namespace gpu { |
19 | 18 |
20 // A resource ID, key to the resource maps. | 19 // A resource ID, key to the resource maps. |
21 typedef uint32 ResourceId; | 20 typedef uint32 ResourceId; |
22 // Invalid resource ID. | 21 // Invalid resource ID. |
23 static const ResourceId kInvalidResource = 0u; | 22 static const ResourceId kInvalidResource = 0u; |
24 | 23 |
25 class GPU_EXPORT IdAllocatorInterface { | 24 class IdAllocatorInterface { |
26 public: | 25 public: |
27 virtual ~IdAllocatorInterface(); | 26 virtual ~IdAllocatorInterface(); |
28 | 27 |
29 // Allocates a new resource ID. | 28 // Allocates a new resource ID. |
30 virtual ResourceId AllocateID() = 0; | 29 virtual ResourceId AllocateID() = 0; |
31 | 30 |
32 // Allocates an Id starting at or above desired_id. | 31 // Allocates an Id starting at or above desired_id. |
33 // Note: may wrap if it starts near limit. | 32 // Note: may wrap if it starts near limit. |
34 virtual ResourceId AllocateIDAtOrAbove(ResourceId desired_id) = 0; | 33 virtual ResourceId AllocateIDAtOrAbove(ResourceId desired_id) = 0; |
35 | 34 |
36 // Marks an id as used. Returns false if id was already used. | 35 // Marks an id as used. Returns false if id was already used. |
37 virtual bool MarkAsUsed(ResourceId id) = 0; | 36 virtual bool MarkAsUsed(ResourceId id) = 0; |
38 | 37 |
39 // Frees a resource ID. | 38 // Frees a resource ID. |
40 virtual void FreeID(ResourceId id) = 0; | 39 virtual void FreeID(ResourceId id) = 0; |
41 | 40 |
42 // Checks whether or not a resource ID is in use. | 41 // Checks whether or not a resource ID is in use. |
43 virtual bool InUse(ResourceId id) const = 0; | 42 virtual bool InUse(ResourceId id) const = 0; |
44 }; | 43 }; |
45 | 44 |
46 // A class to manage the allocation of resource IDs. | 45 // A class to manage the allocation of resource IDs. |
47 class GPU_EXPORT IdAllocator : public IdAllocatorInterface { | 46 class IdAllocator : public IdAllocatorInterface { |
48 public: | 47 public: |
49 IdAllocator(); | 48 IdAllocator(); |
50 virtual ~IdAllocator(); | 49 virtual ~IdAllocator(); |
51 | 50 |
52 // Implement IdAllocatorInterface. | 51 // Implement IdAllocatorInterface. |
53 virtual ResourceId AllocateID() OVERRIDE; | 52 virtual ResourceId AllocateID() OVERRIDE; |
54 virtual ResourceId AllocateIDAtOrAbove(ResourceId desired_id) OVERRIDE; | 53 virtual ResourceId AllocateIDAtOrAbove(ResourceId desired_id) OVERRIDE; |
55 virtual bool MarkAsUsed(ResourceId id) OVERRIDE; | 54 virtual bool MarkAsUsed(ResourceId id) OVERRIDE; |
56 virtual void FreeID(ResourceId id) OVERRIDE; | 55 virtual void FreeID(ResourceId id) OVERRIDE; |
57 virtual bool InUse(ResourceId id) const OVERRIDE; | 56 virtual bool InUse(ResourceId id) const OVERRIDE; |
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90 | 89 |
91 private: | 90 private: |
92 ResourceId last_id_; | 91 ResourceId last_id_; |
93 | 92 |
94 DISALLOW_COPY_AND_ASSIGN(NonReusedIdAllocator); | 93 DISALLOW_COPY_AND_ASSIGN(NonReusedIdAllocator); |
95 }; | 94 }; |
96 | 95 |
97 } // namespace gpu | 96 } // namespace gpu |
98 | 97 |
99 #endif // GPU_COMMAND_BUFFER_CLIENT_ID_ALLOCATOR_H_ | 98 #endif // GPU_COMMAND_BUFFER_CLIENT_ID_ALLOCATOR_H_ |
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