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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_MEMORY_TRACKING_H_
#define GPU_COMMAND_BUFFER_SERVICE_MEMORY_TRACKING_H_
#include <string>
#include "base/basictypes.h"
#include "base/debug/trace_event.h"
namespace gpu {
namespace gles2 {
// A MemoryTracker is used to propagate per-ContextGroup memory usage
// statistics to the global GpuMemoryManager.
class MemoryTracker : public base::RefCounted<MemoryTracker> {
public:
enum Pool {
kUnmanaged,
kManaged
};
virtual void TrackMemoryAllocatedChange(size_t old_size,
size_t new_size,
Pool pool) = 0;
// Ensure a certain amount of GPU memory is free. Returns true on success.
virtual bool EnsureGPUMemoryAvailable(size_t size_needed) = 0;
protected:
friend class base::RefCounted<MemoryTracker>;
MemoryTracker() {}
virtual ~MemoryTracker() {};
private:
DISALLOW_COPY_AND_ASSIGN(MemoryTracker);
};
// A MemoryTypeTracker tracks the use of a particular type of memory (buffer,
// texture, or renderbuffer) and forward the result to a specified
// MemoryTracker.
class MemoryTypeTracker {
public:
MemoryTypeTracker(MemoryTracker* memory_tracker, MemoryTracker::Pool pool)
: memory_tracker_(memory_tracker),
pool_(pool),
has_done_update_(false),
mem_represented_(0),
mem_represented_at_last_update_(0) {
UpdateMemRepresented();
}
~MemoryTypeTracker() {
UpdateMemRepresented();
}
void TrackMemAlloc(size_t bytes) {
mem_represented_ += bytes;
UpdateMemRepresented();
}
void TrackMemFree(size_t bytes) {
DCHECK(bytes <= mem_represented_);
mem_represented_ -= bytes;
UpdateMemRepresented();
}
size_t GetMemRepresented() const {
return mem_represented_at_last_update_;
}
// Ensure a certain amount of GPU memory is free. Returns true on success.
bool EnsureGPUMemoryAvailable(size_t size_needed) {
if (memory_tracker_) {
return memory_tracker_->EnsureGPUMemoryAvailable(size_needed);
}
return true;
}
private:
void UpdateMemRepresented() {
// Skip redundant updates only if we have already done an update.
if (!has_done_update_ &&
mem_represented_ == mem_represented_at_last_update_) {
return;
}
if (memory_tracker_) {
memory_tracker_->TrackMemoryAllocatedChange(
mem_represented_at_last_update_,
mem_represented_,
pool_);
}
has_done_update_ = true;
mem_represented_at_last_update_ = mem_represented_;
}
MemoryTracker* memory_tracker_;
MemoryTracker::Pool pool_;
bool has_done_update_;
size_t mem_represented_;
size_t mem_represented_at_last_update_;
DISALLOW_COPY_AND_ASSIGN(MemoryTypeTracker);
};
} // namespace gles2
} // namespace gpu
#endif // GPU_COMMAND_BUFFER_SERVICE_MEMORY_TRACKING_H_
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