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// Copyright (c) 2017 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.
#include <map>
#include "base/synchronization/lock.h"
#include "gpu/command_buffer/client/client_discardable_manager.h"
#include "gpu/gpu_export.h"
namespace gpu {
// A helper class used to manage discardable textures. Makes use of
// ClientDiscardableManager. Used by the GLES2 Implementation.
// NOTE: The presence of locking on this class does not make it threadsafe.
// The underlying locking *only* allows calling TextureIsValid,
// LockTexture, and TextureIsDeletedForTracing without holding the GL context
// lock. All other calls still require that the context lock be held.
class GPU_EXPORT ClientDiscardableTextureManager {
ClientDiscardableHandle InitializeTexture(CommandBuffer* command_buffer,
uint32_t texture_id);
bool LockTexture(uint32_t texture_id);
void UnlockTexture(uint32_t texture_id, bool* should_unbind_texture);
// Must be called by the GLES2Implementation when a texture is being deleted
// to allow tracking memory to be reclaimed.
void FreeTexture(uint32_t texture_id);
bool TextureIsValid(uint32_t texture_id) const;
// Tracing only functions.
bool TextureIsDeletedForTracing(uint32_t texture_id) const;
// Test only functions.
ClientDiscardableManager* DiscardableManagerForTesting() {
return &discardable_manager_;
ClientDiscardableHandle GetHandleForTesting(uint32_t texture_id);
struct TextureEntry {
TextureEntry(ClientDiscardableHandle::Id id);
TextureEntry(const TextureEntry& other);
TextureEntry& operator=(const TextureEntry& other);
ClientDiscardableHandle::Id id;
// Tracks the lock count of the given texture. Used to unbind texture
// the texture when fully unlocked.
uint32_t client_lock_count = 1;
// Access to other members must always be done with |lock_| held.
mutable base::Lock lock_;
std::map<uint32_t, TextureEntry> texture_entries_;
ClientDiscardableManager discardable_manager_;
} // namespace gpu