Adding GpuMemoryManager to track GpuCommandBufferStub visibility and last_used_time and dictate mem…

content/common/gpu/gpu_memory_allocation.h

+// 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 CONTENT_COMMON_GPU_GPU_MEMORY_ALLOCATION_H_
+#define CONTENT_COMMON_GPU_GPU_MEMORY_ALLOCATION_H_
+#pragma once
+
+#include "base/basictypes.h"
+
+// These are memory allocation limits assigned to a context.
+// They will change over time, given memory availability, and browser state
+// Exceeding these limits for an unreasonable amount of time will cause context
+// to be lost.
+class GpuMemoryAllocation {
+ public:
+  int gpuResourceSizeInBytes;
+  bool hasFrontbuffer;
+  bool hasBackbuffer;
+
+  GpuMemoryAllocation()
+      : gpuResourceSizeInBytes(0),
+        hasFrontbuffer(false),
+        hasBackbuffer(false) {
+  }
+
+  GpuMemoryAllocation(int gpuResourceSizeInBytes,
+                      bool hasFrontbuffer,
+                      bool hasBackbuffer)
+      : gpuResourceSizeInBytes(gpuResourceSizeInBytes),
+        hasFrontbuffer(hasFrontbuffer),
+        hasBackbuffer(hasBackbuffer) {
+  }
+};
+
+inline bool operator==(const GpuMemoryAllocation& lhs,
+                       const GpuMemoryAllocation& rhs) {
+  return lhs.gpuResourceSizeInBytes == rhs.gpuResourceSizeInBytes &&
+      lhs.hasFrontbuffer == rhs.hasFrontbuffer &&
+      lhs.hasBackbuffer == rhs.hasBackbuffer;
+}
+
+inline bool operator!=(const GpuMemoryAllocation& lhs,
+                       const GpuMemoryAllocation& rhs) {
+  return !(lhs == rhs);
+}

[nduca, 2012/02/01 00:01:17]

What's the oeprator overloading being used for? Seems superfluous to me.

[mmocny, 2012/02/01 15:29:42]

For now, during testing.
I could have defined the operators in the test file, but I think I may need them
in a subsequent patch. (cache the current allocation in GpuCommandBufferStub and
only send if it changed).
On 2012/02/01 00:01:17, nduca wrote:

+
+// Contexts should give ideal memory allocation hints to the GpuMemoryManager
+// so that it can make better decisions on how to split resources.
+// If memory is constrained and/or a context has lower priority than others,
+// the allocated values may be lower than the requested amounts (see above).
+class GpuIdealMemoryAllocation {
+ public:
+};
+
+#endif // CONTENT_COMMON_GPU_GPU_MEMORY_ALLOCATION_H_