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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 "gpu/command_buffer/common/constants.h"
#include "gpu/command_buffer/common/mailbox.h"
#include "gpu/gpu_export.h"
typedef signed char GLbyte;
namespace gpu {
namespace gles2 {
class Texture;
class TextureManager;
// Manages resources scoped beyond the context or context group level.
class GPU_EXPORT MailboxManager : public base::RefCounted<MailboxManager> {
public:
MailboxManager();
// Look up the texture definition from the named mailbox.
Texture* ConsumeTexture(unsigned target, const Mailbox& mailbox);
// Put the texture into the named mailbox.
void ProduceTexture(unsigned target,
const Mailbox& mailbox,
Texture* texture);
// Destroy any mailbox that reference the given texture.
void TextureDeleted(Texture* texture);
private:
friend class base::RefCounted<MailboxManager>;
~MailboxManager();
struct TargetName {
TargetName(unsigned target, const Mailbox& mailbox);
unsigned target;
Mailbox mailbox;
};
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;
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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