Service/ClientDiscardableManager

gpu/command_buffer/service/service_discardable_manager.h

+// 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.
+
+#ifndef GPU_COMMAND_BUFFER_SERVICE_SERVICE_DISCARDABLE_MANAGER_H_
+#define GPU_COMMAND_BUFFER_SERVICE_SERVICE_DISCARDABLE_MANAGER_H_
+
+#include <vector>
+
+#include "base/containers/mru_cache.h"
+#include "gpu/command_buffer/common/discardable_handle.h"
+#include "gpu/command_buffer/service/context_group.h"
+#include "gpu/gpu_export.h"
+
+namespace gpu {
+
+class GPU_EXPORT ServiceDiscardableManager
+    : public base::RefCounted<ServiceDiscardableManager> {

[piman, 2017/05/02 22:21:03]

nit: does this need to be refcounted, or could it be singly-owned by a top-level
class e.g. GpuChannelManager or GpuService?

[ericrk, 2017/05/10 21:36:03]

This is now a singly-owned object on GpuChannelManager - from looking through
the code this seems fine (this shouldn't be kept alive past GpuChannelManager
destruction). Curious to look at some of the other scoped_refptr classes
(shader_translator_cache_ for instance) and understand if they need
scoped_refptr as well.

+ public:
+  ServiceDiscardableManager();
+
+  void InsertLockedTexture(uint32_t texture_id,
+                           size_t texture_size,
+                           gles2::ContextGroup* context_group,
+                           ServiceDiscardableHandle handle);
+  // Returns false if texture_id does not exist.
+  bool UnlockTexture(uint32_t texture_id,
+                     const gles2::ContextGroup* context_group);
+
+  // Called when a texture is deleted externally, via glDeleteTextures, to
+  // clean up state.
+  void OnTextureDeleted(uint32_t texture_id,
+                        const gles2::ContextGroup* context_group);
+
+  // Test only functions:
+  size_t NumCacheEntriesForTesting() const { return entries_.size(); }
+  bool IsEntryLockedForTesting(uint32_t texture_id,
+                               const gles2::ContextGroup* context_group) const;
+
+ private:
+  friend class base::RefCounted<ServiceDiscardableManager>;
+  ~ServiceDiscardableManager();
+
+  void EnforceLimits();
+
+  struct GpuDiscardableEntry {
+    ServiceDiscardableHandle handle;
+    size_t size;
+  };
+  struct GpuDiscardableEntryKey {
+    uint32_t texture_id;
+    const gles2::ContextGroup* context_group;
+  };
+  struct GpuDiscardableEntryKeyCompare {
+    bool operator()(const GpuDiscardableEntryKey& lhs,
+                    const GpuDiscardableEntryKey& rhs) const {
+      return lhs.context_group < rhs.context_group ||
+             (lhs.context_group == rhs.context_group &&
+              lhs.texture_id < rhs.texture_id);
+    }
+  };
+  using EntryCache = base::MRUCache<GpuDiscardableEntryKey,
+                                    GpuDiscardableEntry,
+                                    GpuDiscardableEntryKeyCompare>;
+  EntryCache entries_;
+
+  size_t total_size_ = 0;
+};
+
+}  // namespace gpu
+
+#endif  // GPU_COMMAND_BUFFER_SERVICE_SERVICE_DISCARDABLE_MANAGER_H_