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// 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 Texture;
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 GPU_EXPORT MailboxName {
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);
// Look up the texture definition from the named mailbox.
Texture* ConsumeTexture(unsigned target, const MailboxName& name);
// Put the texture into the named mailbox.
bool ProduceTexture(unsigned target,
const MailboxName& name,
Texture* texture);
// Destroy any mailbox that reference the given texture.
void TextureDeleted(Texture* texture);
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);
// This is a bidirectional map between mailbox and textures. We can have
// multiple mailboxes per texture, but one texture per mailbox. We keep an
// iterator in the MailboxToTextureMap to be able to manage changes to
// the TextureToMailboxMap efficiently.
typedef std::multimap<Texture*, TargetName> TextureToMailboxMap;
typedef std::map<
TargetName,
TextureToMailboxMap::iterator,
std::pointer_to_binary_function<
const TargetName&, const TargetName&, bool> > MailboxToTextureMap;
char private_key_[GL_MAILBOX_SIZE_CHROMIUM / 2];
crypto::HMAC hmac_;
MailboxToTextureMap mailbox_to_textures_;
TextureToMailboxMap textures_to_mailboxes_;
DISALLOW_COPY_AND_ASSIGN(MailboxManager);
};
} // namespage gles2
} // namespace gpu
#endif // GPU_COMMAND_BUFFER_SERVICE_MAILBOX_MANAGER_H_
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