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
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
|
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef GPU_COMMAND_BUFFER_SERVICE_MAILBOX_MANAGER_H_
#define GPU_COMMAND_BUFFER_SERVICE_MAILBOX_MANAGER_H_
#include <functional>
#include <map>
#include "base/memory/linked_ptr.h"
#include "base/memory/ref_counted.h"
#include "crypto/hmac.h"
#include "gpu/command_buffer/common/constants.h"
#include "gpu/gpu_export.h"
// From gl2/gl2ext.h.
#ifndef GL_MAILBOX_SIZE_CHROMIUM
#define GL_MAILBOX_SIZE_CHROMIUM 64
#endif
typedef signed char GLbyte;
namespace gpu {
namespace gles2 {
class TextureDefinition;
class TextureManager;
// Identifies a mailbox where a texture definition can be stored for
// transferring textures between contexts that are not in the same context
// group. It is a random key signed with a hash of a private key.
struct MailboxName {
GLbyte key[GL_MAILBOX_SIZE_CHROMIUM / 2];
GLbyte signature[GL_MAILBOX_SIZE_CHROMIUM / 2];
};
// Manages resources scoped beyond the context or context group level.
class GPU_EXPORT MailboxManager : public base::RefCounted<MailboxManager> {
public:
MailboxManager();
// Generate a unique mailbox name signed with the manager's private key.
void GenerateMailboxName(MailboxName* name);
// Remove the texture definition from the named mailbox and empty the mailbox.
TextureDefinition* ConsumeTexture(unsigned target, const MailboxName& name);
// Put the texture definition in the named mailbox.
bool ProduceTexture(unsigned target,
const MailboxName& name,
TextureDefinition* definition,
TextureManager* owner);
// Destroy any texture definitions and mailboxes owned by the given texture
// manager.
void DestroyOwnedTextures(TextureManager* owner, bool have_context);
std::string private_key() {
return std::string(private_key_, sizeof(private_key_));
}
private:
friend class base::RefCounted<MailboxManager>;
~MailboxManager();
void SignMailboxName(MailboxName* name);
bool IsMailboxNameValid(const MailboxName& name);
struct TargetName {
TargetName(unsigned target, const MailboxName& name);
unsigned target;
MailboxName name;
};
static bool TargetNameLess(const TargetName& lhs, const TargetName& rhs);
struct OwnedTextureDefinition {
OwnedTextureDefinition(TextureDefinition* definition,
TextureManager* owner);
~OwnedTextureDefinition();
linked_ptr<TextureDefinition> definition;
TextureManager* owner;
};
typedef std::map<
TargetName,
OwnedTextureDefinition,
std::pointer_to_binary_function<
const TargetName&, const TargetName&, bool> > TextureDefinitionMap;
char private_key_[GL_MAILBOX_SIZE_CHROMIUM / 2];
crypto::HMAC hmac_;
TextureDefinitionMap textures_;
DISALLOW_COPY_AND_ASSIGN(MailboxManager);
};
} // namespage gles2
} // namespace gpu
#endif // GPU_COMMAND_BUFFER_SERVICE_MAILBOX_MANAGER_H_
|
