gpu/command_buffer/client/transfer_buffer_unittest.cc - external/github.com/flutter/engine - Git at Google

 // 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.

 // Tests for the Command Buffer Helper.

 #include "gpu/command_buffer/client/transfer_buffer.h"

 #include "base/compiler_specific.h"
 #include "gpu/command_buffer/client/client_test_helper.h"
 #include "gpu/command_buffer/client/cmd_buffer_helper.h"
 #include "gpu/command_buffer/common/command_buffer.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "testing/gmock/include/gmock/gmock.h"

 using ::testing::_;
 using ::testing::AtMost;
 using ::testing::Invoke;
 using ::testing::Return;
 using ::testing::SetArgPointee;
 using ::testing::StrictMock;

 namespace gpu {


 class TransferBufferTest : public testing::Test {
  protected:
   static const int32 kNumCommandEntries = 400;
   static const int32 kCommandBufferSizeBytes =
       kNumCommandEntries * sizeof(CommandBufferEntry);
   static const unsigned int kStartingOffset = 64;
   static const unsigned int kAlignment = 4;
   static const size_t kTransferBufferSize = 256;

   TransferBufferTest()
       : transfer_buffer_id_(0) {
   }

   void SetUp() override;
   void TearDown() override;

   virtual void Initialize(unsigned int size_to_flush) {
     ASSERT_TRUE(transfer_buffer_->Initialize(
         kTransferBufferSize,
         kStartingOffset,
         kTransferBufferSize,
         kTransferBufferSize,
         kAlignment,
         size_to_flush));
   }

   MockClientCommandBufferMockFlush* command_buffer() const {
     return command_buffer_.get();
   }

   scoped_ptr<MockClientCommandBufferMockFlush> command_buffer_;
   scoped_ptr<CommandBufferHelper> helper_;
   scoped_ptr<TransferBuffer> transfer_buffer_;
   int32 transfer_buffer_id_;
 };

 void TransferBufferTest::SetUp() {
   command_buffer_.reset(new StrictMock<MockClientCommandBufferMockFlush>());
   ASSERT_TRUE(command_buffer_->Initialize());

   helper_.reset(new CommandBufferHelper(command_buffer()));
   ASSERT_TRUE(helper_->Initialize(kCommandBufferSizeBytes));

   transfer_buffer_id_ = command_buffer()->GetNextFreeTransferBufferId();

   transfer_buffer_.reset(new TransferBuffer(helper_.get()));
 }

 void TransferBufferTest::TearDown() {
   if (transfer_buffer_->HaveBuffer()) {
     EXPECT_CALL(*command_buffer(), DestroyTransferBuffer(_))
         .Times(1)
         .RetiresOnSaturation();
   }
   // For command buffer.
   EXPECT_CALL(*command_buffer(), DestroyTransferBuffer(_))
       .Times(1)
       .RetiresOnSaturation();
   EXPECT_CALL(*command_buffer(), OnFlush()).Times(AtMost(1));
   EXPECT_CALL(*command_buffer(), Flush(_)).Times(AtMost(1));
   transfer_buffer_.reset();
 }

 // GCC requires these declarations, but MSVC requires they not be present
 #ifndef _MSC_VER
 const int32 TransferBufferTest::kNumCommandEntries;
 const int32 TransferBufferTest::kCommandBufferSizeBytes;
 const unsigned int TransferBufferTest::kStartingOffset;
 const unsigned int TransferBufferTest::kAlignment;
 const size_t TransferBufferTest::kTransferBufferSize;
 #endif

 TEST_F(TransferBufferTest, Basic) {
   Initialize(0);
   EXPECT_TRUE(transfer_buffer_->HaveBuffer());
   EXPECT_EQ(transfer_buffer_id_, transfer_buffer_->GetShmId());
   EXPECT_EQ(
       kTransferBufferSize - kStartingOffset,
       transfer_buffer_->GetCurrentMaxAllocationWithoutRealloc());
 }

 TEST_F(TransferBufferTest, Free) {
   Initialize(0);
   EXPECT_TRUE(transfer_buffer_->HaveBuffer());
   EXPECT_EQ(transfer_buffer_id_, transfer_buffer_->GetShmId());

   // Free buffer.
   EXPECT_CALL(*command_buffer(), DestroyTransferBuffer(_))
       .Times(1)
       .RetiresOnSaturation();
   transfer_buffer_->Free();
   // See it's freed.
   EXPECT_FALSE(transfer_buffer_->HaveBuffer());
   // See that it gets reallocated.
   EXPECT_EQ(transfer_buffer_id_, transfer_buffer_->GetShmId());
   EXPECT_TRUE(transfer_buffer_->HaveBuffer());

   // Free buffer.
   EXPECT_CALL(*command_buffer(), DestroyTransferBuffer(_))
       .Times(1)
       .RetiresOnSaturation();
   transfer_buffer_->Free();
   // See it's freed.
   EXPECT_FALSE(transfer_buffer_->HaveBuffer());
   // See that it gets reallocated.
   EXPECT_TRUE(transfer_buffer_->GetResultBuffer() != NULL);
   EXPECT_TRUE(transfer_buffer_->HaveBuffer());

   // Free buffer.
   EXPECT_CALL(*command_buffer(), DestroyTransferBuffer(_))
       .Times(1)
       .RetiresOnSaturation();
   transfer_buffer_->Free();
   // See it's freed.
   EXPECT_FALSE(transfer_buffer_->HaveBuffer());
   // See that it gets reallocated.
   unsigned int size = 0;
   void* data = transfer_buffer_->AllocUpTo(1, &size);
   EXPECT_TRUE(data != NULL);
   EXPECT_TRUE(transfer_buffer_->HaveBuffer());
   transfer_buffer_->FreePendingToken(data, 1);

   // Free buffer.
   EXPECT_CALL(*command_buffer(), DestroyTransferBuffer(_))
       .Times(1)
       .RetiresOnSaturation();
   transfer_buffer_->Free();
   // See it's freed.
   EXPECT_FALSE(transfer_buffer_->HaveBuffer());
   // See that it gets reallocated.
   transfer_buffer_->GetResultOffset();
   EXPECT_TRUE(transfer_buffer_->HaveBuffer());

   EXPECT_EQ(
       kTransferBufferSize - kStartingOffset,
       transfer_buffer_->GetCurrentMaxAllocationWithoutRealloc());

   // Test freeing twice.
   EXPECT_CALL(*command_buffer(), DestroyTransferBuffer(_))
       .Times(1)
       .RetiresOnSaturation();
   transfer_buffer_->Free();
   transfer_buffer_->Free();
 }

 TEST_F(TransferBufferTest, TooLargeAllocation) {
   Initialize(0);
   // Check that we can't allocate large than max size.
   void* ptr = transfer_buffer_->Alloc(kTransferBufferSize + 1);
   EXPECT_TRUE(ptr == NULL);
   // Check we if we try to allocate larger than max we get max.
   unsigned int size_allocated = 0;
   ptr = transfer_buffer_->AllocUpTo(
       kTransferBufferSize + 1, &size_allocated);
   ASSERT_TRUE(ptr != NULL);
   EXPECT_EQ(kTransferBufferSize - kStartingOffset, size_allocated);
   transfer_buffer_->FreePendingToken(ptr, 1);
 }

 TEST_F(TransferBufferTest, MemoryAlignmentAfterZeroAllocation) {
   Initialize(32u);
   void* ptr = transfer_buffer_->Alloc(0);
   EXPECT_EQ((reinterpret_cast<uintptr_t>(ptr) & (kAlignment - 1)), 0u);
   transfer_buffer_->FreePendingToken(ptr, static_cast<unsigned int>(-1));
   // Check that the pointer is aligned on the following allocation.
   ptr = transfer_buffer_->Alloc(4);
   EXPECT_EQ((reinterpret_cast<uintptr_t>(ptr) & (kAlignment - 1)), 0u);
   transfer_buffer_->FreePendingToken(ptr, 1);
 }

 TEST_F(TransferBufferTest, Flush) {
   Initialize(16u);
   unsigned int size_allocated = 0;
   for (int i = 0; i < 8; ++i) {
     void* ptr = transfer_buffer_->AllocUpTo(8u, &size_allocated);
     ASSERT_TRUE(ptr != NULL);
     EXPECT_EQ(8u, size_allocated);
     if (i % 2) {
       EXPECT_CALL(*command_buffer(), Flush(_))
           .Times(1)
           .RetiresOnSaturation();
     }
     transfer_buffer_->FreePendingToken(ptr, helper_->InsertToken());
   }
   for (int i = 0; i < 8; ++i) {
     void* ptr = transfer_buffer_->Alloc(8u);
     ASSERT_TRUE(ptr != NULL);
     if (i % 2) {
       EXPECT_CALL(*command_buffer(), Flush(_))
           .Times(1)
           .RetiresOnSaturation();
     }
     transfer_buffer_->FreePendingToken(ptr, helper_->InsertToken());
   }
 }

 class MockClientCommandBufferCanFail : public MockClientCommandBufferMockFlush {
  public:
   MockClientCommandBufferCanFail() {
   }
   virtual ~MockClientCommandBufferCanFail() {
   }

   MOCK_METHOD2(CreateTransferBuffer,
                scoped_refptr<Buffer>(size_t size, int32* id));

   scoped_refptr<gpu::Buffer> RealCreateTransferBuffer(size_t size, int32* id) {
     return MockCommandBufferBase::CreateTransferBuffer(size, id);
   }
 };

 class TransferBufferExpandContractTest : public testing::Test {
  protected:
   static const int32 kNumCommandEntries = 400;
   static const int32 kCommandBufferSizeBytes =
       kNumCommandEntries * sizeof(CommandBufferEntry);
   static const unsigned int kStartingOffset = 64;
   static const unsigned int kAlignment = 4;
   static const size_t kStartTransferBufferSize = 256;
   static const size_t kMaxTransferBufferSize = 1024;
   static const size_t kMinTransferBufferSize = 128;

   TransferBufferExpandContractTest()
       : transfer_buffer_id_(0) {
   }

   void SetUp() override;
   void TearDown() override;

   MockClientCommandBufferCanFail* command_buffer() const {
     return command_buffer_.get();
   }

   scoped_ptr<MockClientCommandBufferCanFail> command_buffer_;
   scoped_ptr<CommandBufferHelper> helper_;
   scoped_ptr<TransferBuffer> transfer_buffer_;
   int32 transfer_buffer_id_;
 };

 void TransferBufferExpandContractTest::SetUp() {
   command_buffer_.reset(new StrictMock<MockClientCommandBufferCanFail>());
   ASSERT_TRUE(command_buffer_->Initialize());

   EXPECT_CALL(*command_buffer(),
               CreateTransferBuffer(kCommandBufferSizeBytes, _))
       .WillOnce(Invoke(
           command_buffer(),
           &MockClientCommandBufferCanFail::RealCreateTransferBuffer))
       .RetiresOnSaturation();

   helper_.reset(new CommandBufferHelper(command_buffer()));
   ASSERT_TRUE(helper_->Initialize(kCommandBufferSizeBytes));

   transfer_buffer_id_ = command_buffer()->GetNextFreeTransferBufferId();

   EXPECT_CALL(*command_buffer(),
               CreateTransferBuffer(kStartTransferBufferSize, _))
       .WillOnce(Invoke(
           command_buffer(),
           &MockClientCommandBufferCanFail::RealCreateTransferBuffer))
       .RetiresOnSaturation();

   transfer_buffer_.reset(new TransferBuffer(helper_.get()));
   ASSERT_TRUE(transfer_buffer_->Initialize(
       kStartTransferBufferSize,
       kStartingOffset,
       kMinTransferBufferSize,
       kMaxTransferBufferSize,
       kAlignment,
       0));
 }

 void TransferBufferExpandContractTest::TearDown() {
   if (transfer_buffer_->HaveBuffer()) {
     EXPECT_CALL(*command_buffer(), DestroyTransferBuffer(_))
         .Times(1)
         .RetiresOnSaturation();
   }
   // For command buffer.
   EXPECT_CALL(*command_buffer(), DestroyTransferBuffer(_))
       .Times(1)
       .RetiresOnSaturation();
   transfer_buffer_.reset();
 }

 // GCC requires these declarations, but MSVC requires they not be present
 #ifndef _MSC_VER
 const int32 TransferBufferExpandContractTest::kNumCommandEntries;
 const int32 TransferBufferExpandContractTest::kCommandBufferSizeBytes;
 const unsigned int TransferBufferExpandContractTest::kStartingOffset;
 const unsigned int TransferBufferExpandContractTest::kAlignment;
 const size_t TransferBufferExpandContractTest::kStartTransferBufferSize;
 const size_t TransferBufferExpandContractTest::kMaxTransferBufferSize;
 const size_t TransferBufferExpandContractTest::kMinTransferBufferSize;
 #endif

 TEST_F(TransferBufferExpandContractTest, Expand) {
   // Check it starts at starting size.
   EXPECT_EQ(
       kStartTransferBufferSize - kStartingOffset,
       transfer_buffer_->GetCurrentMaxAllocationWithoutRealloc());

   EXPECT_CALL(*command_buffer(), DestroyTransferBuffer(_))
       .Times(1)
       .RetiresOnSaturation();
   EXPECT_CALL(*command_buffer(),
               CreateTransferBuffer(kStartTransferBufferSize * 2, _))
       .WillOnce(Invoke(
           command_buffer(),
           &MockClientCommandBufferCanFail::RealCreateTransferBuffer))
       .RetiresOnSaturation();

   // Try next power of 2.
   const size_t kSize1 = 512 - kStartingOffset;
   unsigned int size_allocated = 0;
   void* ptr = transfer_buffer_->AllocUpTo(kSize1, &size_allocated);
   ASSERT_TRUE(ptr != NULL);
   EXPECT_EQ(kSize1, size_allocated);
   EXPECT_EQ(kSize1, transfer_buffer_->GetCurrentMaxAllocationWithoutRealloc());
   transfer_buffer_->FreePendingToken(ptr, 1);

   EXPECT_CALL(*command_buffer(), DestroyTransferBuffer(_))
       .Times(1)
       .RetiresOnSaturation();
   EXPECT_CALL(*command_buffer(),
               CreateTransferBuffer(kMaxTransferBufferSize, _))
       .WillOnce(Invoke(
           command_buffer(),
           &MockClientCommandBufferCanFail::RealCreateTransferBuffer))
       .RetiresOnSaturation();

   // Try next power of 2.
   const size_t kSize2 = 1024 - kStartingOffset;
   ptr = transfer_buffer_->AllocUpTo(kSize2, &size_allocated);
   ASSERT_TRUE(ptr != NULL);
   EXPECT_EQ(kSize2, size_allocated);
   EXPECT_EQ(kSize2, transfer_buffer_->GetCurrentMaxAllocationWithoutRealloc());
   transfer_buffer_->FreePendingToken(ptr, 1);

   // Try next one more. Should not go past max.
   size_allocated = 0;
   const size_t kSize3 = kSize2 + 1;
   ptr = transfer_buffer_->AllocUpTo(kSize3, &size_allocated);
   EXPECT_EQ(kSize2, size_allocated);
   EXPECT_EQ(kSize2, transfer_buffer_->GetCurrentMaxAllocationWithoutRealloc());
   transfer_buffer_->FreePendingToken(ptr, 1);
 }

 TEST_F(TransferBufferExpandContractTest, Contract) {
   // Check it starts at starting size.
   EXPECT_EQ(
       kStartTransferBufferSize - kStartingOffset,
       transfer_buffer_->GetCurrentMaxAllocationWithoutRealloc());

   // Free buffer.
   EXPECT_CALL(*command_buffer(), DestroyTransferBuffer(_))
       .Times(1)
       .RetiresOnSaturation();
   transfer_buffer_->Free();
   // See it's freed.
   EXPECT_FALSE(transfer_buffer_->HaveBuffer());

   // Try to allocate again, fail first request
   EXPECT_CALL(*command_buffer(),
               CreateTransferBuffer(kStartTransferBufferSize, _))
       .WillOnce(
            DoAll(SetArgPointee<1>(-1), Return(scoped_refptr<gpu::Buffer>())))
       .RetiresOnSaturation();
   EXPECT_CALL(*command_buffer(),
               CreateTransferBuffer(kMinTransferBufferSize, _))
       .WillOnce(Invoke(
           command_buffer(),
           &MockClientCommandBufferCanFail::RealCreateTransferBuffer))
       .RetiresOnSaturation();

   const size_t kSize1 = 256 - kStartingOffset;
   const size_t kSize2 = 128 - kStartingOffset;
   unsigned int size_allocated = 0;
   void* ptr = transfer_buffer_->AllocUpTo(kSize1, &size_allocated);
   ASSERT_TRUE(ptr != NULL);
   EXPECT_EQ(kSize2, size_allocated);
   EXPECT_EQ(kSize2, transfer_buffer_->GetCurrentMaxAllocationWithoutRealloc());
   transfer_buffer_->FreePendingToken(ptr, 1);

   // Free buffer.
   EXPECT_CALL(*command_buffer(), DestroyTransferBuffer(_))
       .Times(1)
       .RetiresOnSaturation();
   transfer_buffer_->Free();
   // See it's freed.
   EXPECT_FALSE(transfer_buffer_->HaveBuffer());

   // Try to allocate again,
   EXPECT_CALL(*command_buffer(),
               CreateTransferBuffer(kMinTransferBufferSize, _))
       .WillOnce(Invoke(
           command_buffer(),
           &MockClientCommandBufferCanFail::RealCreateTransferBuffer))
       .RetiresOnSaturation();

   ptr = transfer_buffer_->AllocUpTo(kSize1, &size_allocated);
   ASSERT_TRUE(ptr != NULL);
   EXPECT_EQ(kSize2, size_allocated);
   EXPECT_EQ(kSize2, transfer_buffer_->GetCurrentMaxAllocationWithoutRealloc());
   transfer_buffer_->FreePendingToken(ptr, 1);
 }

 TEST_F(TransferBufferExpandContractTest, OutOfMemory) {
   // Free buffer.
   EXPECT_CALL(*command_buffer(), DestroyTransferBuffer(_))
       .Times(1)
       .RetiresOnSaturation();
   transfer_buffer_->Free();
   // See it's freed.
   EXPECT_FALSE(transfer_buffer_->HaveBuffer());

   // Try to allocate again, fail both requests.
   EXPECT_CALL(*command_buffer(), CreateTransferBuffer(_, _))
       .WillOnce(
            DoAll(SetArgPointee<1>(-1), Return(scoped_refptr<gpu::Buffer>())))
       .WillOnce(
            DoAll(SetArgPointee<1>(-1), Return(scoped_refptr<gpu::Buffer>())))
       .WillOnce(
            DoAll(SetArgPointee<1>(-1), Return(scoped_refptr<gpu::Buffer>())))
       .RetiresOnSaturation();

   const size_t kSize1 = 512 - kStartingOffset;
   unsigned int size_allocated = 0;
   void* ptr = transfer_buffer_->AllocUpTo(kSize1, &size_allocated);
   ASSERT_TRUE(ptr == NULL);
   EXPECT_FALSE(transfer_buffer_->HaveBuffer());
 }

 TEST_F(TransferBufferExpandContractTest, ReallocsToDefault) {
   // Free buffer.
   EXPECT_CALL(*command_buffer(), DestroyTransferBuffer(_))
       .Times(1)
       .RetiresOnSaturation();
   transfer_buffer_->Free();
   // See it's freed.
   EXPECT_FALSE(transfer_buffer_->HaveBuffer());

   // See that it gets reallocated.
   EXPECT_CALL(*command_buffer(),
               CreateTransferBuffer(kStartTransferBufferSize, _))
       .WillOnce(Invoke(
           command_buffer(),
           &MockClientCommandBufferCanFail::RealCreateTransferBuffer))
       .RetiresOnSaturation();
   EXPECT_EQ(transfer_buffer_id_, transfer_buffer_->GetShmId());
   EXPECT_TRUE(transfer_buffer_->HaveBuffer());

   // Check it's the default size.
   EXPECT_EQ(
       kStartTransferBufferSize - kStartingOffset,
       transfer_buffer_->GetCurrentMaxAllocationWithoutRealloc());
 }

 }  // namespace gpu
	// 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.

	// Tests for the Command Buffer Helper.

	#include "gpu/command_buffer/client/transfer_buffer.h"

	#include "base/compiler_specific.h"
	#include "gpu/command_buffer/client/client_test_helper.h"
	#include "gpu/command_buffer/client/cmd_buffer_helper.h"
	#include "gpu/command_buffer/common/command_buffer.h"
	#include "testing/gtest/include/gtest/gtest.h"
	#include "testing/gmock/include/gmock/gmock.h"

	using ::testing::_;
	using ::testing::AtMost;
	using ::testing::Invoke;
	using ::testing::Return;
	using ::testing::SetArgPointee;
	using ::testing::StrictMock;

	namespace gpu {


	class TransferBufferTest : public testing::Test {
	protected:
	static const int32 kNumCommandEntries = 400;
	static const int32 kCommandBufferSizeBytes =
	kNumCommandEntries * sizeof(CommandBufferEntry);
	static const unsigned int kStartingOffset = 64;
	static const unsigned int kAlignment = 4;
	static const size_t kTransferBufferSize = 256;

	TransferBufferTest()
	: transfer_buffer_id_(0) {
	}

	void SetUp() override;
	void TearDown() override;

	virtual void Initialize(unsigned int size_to_flush) {
	ASSERT_TRUE(transfer_buffer_->Initialize(
	kTransferBufferSize,
	kStartingOffset,
	kTransferBufferSize,
	kTransferBufferSize,
	kAlignment,
	size_to_flush));
	}

	MockClientCommandBufferMockFlush* command_buffer() const {
	return command_buffer_.get();
	}

	scoped_ptr<MockClientCommandBufferMockFlush> command_buffer_;
	scoped_ptr<CommandBufferHelper> helper_;
	scoped_ptr<TransferBuffer> transfer_buffer_;
	int32 transfer_buffer_id_;
	};

	void TransferBufferTest::SetUp() {
	command_buffer_.reset(new StrictMock<MockClientCommandBufferMockFlush>());
	ASSERT_TRUE(command_buffer_->Initialize());

	helper_.reset(new CommandBufferHelper(command_buffer()));
	ASSERT_TRUE(helper_->Initialize(kCommandBufferSizeBytes));

	transfer_buffer_id_ = command_buffer()->GetNextFreeTransferBufferId();

	transfer_buffer_.reset(new TransferBuffer(helper_.get()));
	}

	void TransferBufferTest::TearDown() {
	if (transfer_buffer_->HaveBuffer()) {
	EXPECT_CALL(*command_buffer(), DestroyTransferBuffer(_))
	.Times(1)
	.RetiresOnSaturation();
	}
	// For command buffer.
	EXPECT_CALL(*command_buffer(), DestroyTransferBuffer(_))
	.Times(1)
	.RetiresOnSaturation();
	EXPECT_CALL(*command_buffer(), OnFlush()).Times(AtMost(1));
	EXPECT_CALL(*command_buffer(), Flush(_)).Times(AtMost(1));
	transfer_buffer_.reset();
	}

	// GCC requires these declarations, but MSVC requires they not be present
	#ifndef _MSC_VER
	const int32 TransferBufferTest::kNumCommandEntries;
	const int32 TransferBufferTest::kCommandBufferSizeBytes;
	const unsigned int TransferBufferTest::kStartingOffset;
	const unsigned int TransferBufferTest::kAlignment;
	const size_t TransferBufferTest::kTransferBufferSize;
	#endif

	TEST_F(TransferBufferTest, Basic) {
	Initialize(0);
	EXPECT_TRUE(transfer_buffer_->HaveBuffer());
	EXPECT_EQ(transfer_buffer_id_, transfer_buffer_->GetShmId());
	EXPECT_EQ(
	kTransferBufferSize - kStartingOffset,
	transfer_buffer_->GetCurrentMaxAllocationWithoutRealloc());
	}

	TEST_F(TransferBufferTest, Free) {
	Initialize(0);
	EXPECT_TRUE(transfer_buffer_->HaveBuffer());
	EXPECT_EQ(transfer_buffer_id_, transfer_buffer_->GetShmId());

	// Free buffer.
	EXPECT_CALL(*command_buffer(), DestroyTransferBuffer(_))
	.Times(1)
	.RetiresOnSaturation();
	transfer_buffer_->Free();
	// See it's freed.
	EXPECT_FALSE(transfer_buffer_->HaveBuffer());
	// See that it gets reallocated.
	EXPECT_EQ(transfer_buffer_id_, transfer_buffer_->GetShmId());
	EXPECT_TRUE(transfer_buffer_->HaveBuffer());

	// Free buffer.
	EXPECT_CALL(*command_buffer(), DestroyTransferBuffer(_))
	.Times(1)
	.RetiresOnSaturation();
	transfer_buffer_->Free();
	// See it's freed.
	EXPECT_FALSE(transfer_buffer_->HaveBuffer());
	// See that it gets reallocated.
	EXPECT_TRUE(transfer_buffer_->GetResultBuffer() != NULL);
	EXPECT_TRUE(transfer_buffer_->HaveBuffer());

	// Free buffer.
	EXPECT_CALL(*command_buffer(), DestroyTransferBuffer(_))
	.Times(1)
	.RetiresOnSaturation();
	transfer_buffer_->Free();
	// See it's freed.
	EXPECT_FALSE(transfer_buffer_->HaveBuffer());
	// See that it gets reallocated.
	unsigned int size = 0;
	void* data = transfer_buffer_->AllocUpTo(1, &size);
	EXPECT_TRUE(data != NULL);
	EXPECT_TRUE(transfer_buffer_->HaveBuffer());
	transfer_buffer_->FreePendingToken(data, 1);

	// Free buffer.
	EXPECT_CALL(*command_buffer(), DestroyTransferBuffer(_))
	.Times(1)
	.RetiresOnSaturation();
	transfer_buffer_->Free();
	// See it's freed.
	EXPECT_FALSE(transfer_buffer_->HaveBuffer());
	// See that it gets reallocated.
	transfer_buffer_->GetResultOffset();
	EXPECT_TRUE(transfer_buffer_->HaveBuffer());

	EXPECT_EQ(
	kTransferBufferSize - kStartingOffset,
	transfer_buffer_->GetCurrentMaxAllocationWithoutRealloc());

	// Test freeing twice.
	EXPECT_CALL(*command_buffer(), DestroyTransferBuffer(_))
	.Times(1)
	.RetiresOnSaturation();
	transfer_buffer_->Free();
	transfer_buffer_->Free();
	}

	TEST_F(TransferBufferTest, TooLargeAllocation) {
	Initialize(0);
	// Check that we can't allocate large than max size.
	void* ptr = transfer_buffer_->Alloc(kTransferBufferSize + 1);
	EXPECT_TRUE(ptr == NULL);
	// Check we if we try to allocate larger than max we get max.
	unsigned int size_allocated = 0;
	ptr = transfer_buffer_->AllocUpTo(
	kTransferBufferSize + 1, &size_allocated);
	ASSERT_TRUE(ptr != NULL);
	EXPECT_EQ(kTransferBufferSize - kStartingOffset, size_allocated);
	transfer_buffer_->FreePendingToken(ptr, 1);
	}

	TEST_F(TransferBufferTest, MemoryAlignmentAfterZeroAllocation) {
	Initialize(32u);
	void* ptr = transfer_buffer_->Alloc(0);
	EXPECT_EQ((reinterpret_cast<uintptr_t>(ptr) & (kAlignment - 1)), 0u);
	transfer_buffer_->FreePendingToken(ptr, static_cast<unsigned int>(-1));
	// Check that the pointer is aligned on the following allocation.
	ptr = transfer_buffer_->Alloc(4);
	EXPECT_EQ((reinterpret_cast<uintptr_t>(ptr) & (kAlignment - 1)), 0u);
	transfer_buffer_->FreePendingToken(ptr, 1);
	}

	TEST_F(TransferBufferTest, Flush) {
	Initialize(16u);
	unsigned int size_allocated = 0;
	for (int i = 0; i < 8; ++i) {
	void* ptr = transfer_buffer_->AllocUpTo(8u, &size_allocated);
	ASSERT_TRUE(ptr != NULL);
	EXPECT_EQ(8u, size_allocated);
	if (i % 2) {
	EXPECT_CALL(*command_buffer(), Flush(_))
	.Times(1)
	.RetiresOnSaturation();
	}
	transfer_buffer_->FreePendingToken(ptr, helper_->InsertToken());
	}
	for (int i = 0; i < 8; ++i) {
	void* ptr = transfer_buffer_->Alloc(8u);
	ASSERT_TRUE(ptr != NULL);
	if (i % 2) {
	EXPECT_CALL(*command_buffer(), Flush(_))
	.Times(1)
	.RetiresOnSaturation();
	}
	transfer_buffer_->FreePendingToken(ptr, helper_->InsertToken());
	}
	}

	class MockClientCommandBufferCanFail : public MockClientCommandBufferMockFlush {
	public:
	MockClientCommandBufferCanFail() {
	}
	virtual ~MockClientCommandBufferCanFail() {
	}

	MOCK_METHOD2(CreateTransferBuffer,
	scoped_refptr<Buffer>(size_t size, int32* id));

	scoped_refptr<gpu::Buffer> RealCreateTransferBuffer(size_t size, int32* id) {
	return MockCommandBufferBase::CreateTransferBuffer(size, id);
	}
	};

	class TransferBufferExpandContractTest : public testing::Test {
	protected:
	static const int32 kNumCommandEntries = 400;
	static const int32 kCommandBufferSizeBytes =
	kNumCommandEntries * sizeof(CommandBufferEntry);
	static const unsigned int kStartingOffset = 64;
	static const unsigned int kAlignment = 4;
	static const size_t kStartTransferBufferSize = 256;
	static const size_t kMaxTransferBufferSize = 1024;
	static const size_t kMinTransferBufferSize = 128;

	TransferBufferExpandContractTest()
	: transfer_buffer_id_(0) {
	}

	void SetUp() override;
	void TearDown() override;

	MockClientCommandBufferCanFail* command_buffer() const {
	return command_buffer_.get();
	}

	scoped_ptr<MockClientCommandBufferCanFail> command_buffer_;
	scoped_ptr<CommandBufferHelper> helper_;
	scoped_ptr<TransferBuffer> transfer_buffer_;
	int32 transfer_buffer_id_;
	};

	void TransferBufferExpandContractTest::SetUp() {
	command_buffer_.reset(new StrictMock<MockClientCommandBufferCanFail>());
	ASSERT_TRUE(command_buffer_->Initialize());

	EXPECT_CALL(*command_buffer(),
	CreateTransferBuffer(kCommandBufferSizeBytes, _))
	.WillOnce(Invoke(
	command_buffer(),
	&MockClientCommandBufferCanFail::RealCreateTransferBuffer))
	.RetiresOnSaturation();

	helper_.reset(new CommandBufferHelper(command_buffer()));
	ASSERT_TRUE(helper_->Initialize(kCommandBufferSizeBytes));

	transfer_buffer_id_ = command_buffer()->GetNextFreeTransferBufferId();

	EXPECT_CALL(*command_buffer(),
	CreateTransferBuffer(kStartTransferBufferSize, _))
	.WillOnce(Invoke(
	command_buffer(),
	&MockClientCommandBufferCanFail::RealCreateTransferBuffer))
	.RetiresOnSaturation();

	transfer_buffer_.reset(new TransferBuffer(helper_.get()));
	ASSERT_TRUE(transfer_buffer_->Initialize(
	kStartTransferBufferSize,
	kStartingOffset,
	kMinTransferBufferSize,
	kMaxTransferBufferSize,
	kAlignment,
	0));
	}

	void TransferBufferExpandContractTest::TearDown() {
	if (transfer_buffer_->HaveBuffer()) {
	EXPECT_CALL(*command_buffer(), DestroyTransferBuffer(_))
	.Times(1)
	.RetiresOnSaturation();
	}
	// For command buffer.
	EXPECT_CALL(*command_buffer(), DestroyTransferBuffer(_))
	.Times(1)
	.RetiresOnSaturation();
	transfer_buffer_.reset();
	}

	// GCC requires these declarations, but MSVC requires they not be present
	#ifndef _MSC_VER
	const int32 TransferBufferExpandContractTest::kNumCommandEntries;
	const int32 TransferBufferExpandContractTest::kCommandBufferSizeBytes;
	const unsigned int TransferBufferExpandContractTest::kStartingOffset;
	const unsigned int TransferBufferExpandContractTest::kAlignment;
	const size_t TransferBufferExpandContractTest::kStartTransferBufferSize;
	const size_t TransferBufferExpandContractTest::kMaxTransferBufferSize;
	const size_t TransferBufferExpandContractTest::kMinTransferBufferSize;
	#endif

	TEST_F(TransferBufferExpandContractTest, Expand) {
	// Check it starts at starting size.
	EXPECT_EQ(
	kStartTransferBufferSize - kStartingOffset,
	transfer_buffer_->GetCurrentMaxAllocationWithoutRealloc());

	EXPECT_CALL(*command_buffer(), DestroyTransferBuffer(_))
	.Times(1)
	.RetiresOnSaturation();
	EXPECT_CALL(*command_buffer(),
	CreateTransferBuffer(kStartTransferBufferSize * 2, _))
	.WillOnce(Invoke(
	command_buffer(),
	&MockClientCommandBufferCanFail::RealCreateTransferBuffer))
	.RetiresOnSaturation();

	// Try next power of 2.
	const size_t kSize1 = 512 - kStartingOffset;
	unsigned int size_allocated = 0;
	void* ptr = transfer_buffer_->AllocUpTo(kSize1, &size_allocated);
	ASSERT_TRUE(ptr != NULL);
	EXPECT_EQ(kSize1, size_allocated);
	EXPECT_EQ(kSize1, transfer_buffer_->GetCurrentMaxAllocationWithoutRealloc());
	transfer_buffer_->FreePendingToken(ptr, 1);

	EXPECT_CALL(*command_buffer(), DestroyTransferBuffer(_))
	.Times(1)
	.RetiresOnSaturation();
	EXPECT_CALL(*command_buffer(),
	CreateTransferBuffer(kMaxTransferBufferSize, _))
	.WillOnce(Invoke(
	command_buffer(),
	&MockClientCommandBufferCanFail::RealCreateTransferBuffer))
	.RetiresOnSaturation();

	// Try next power of 2.
	const size_t kSize2 = 1024 - kStartingOffset;
	ptr = transfer_buffer_->AllocUpTo(kSize2, &size_allocated);
	ASSERT_TRUE(ptr != NULL);
	EXPECT_EQ(kSize2, size_allocated);
	EXPECT_EQ(kSize2, transfer_buffer_->GetCurrentMaxAllocationWithoutRealloc());
	transfer_buffer_->FreePendingToken(ptr, 1);

	// Try next one more. Should not go past max.
	size_allocated = 0;
	const size_t kSize3 = kSize2 + 1;
	ptr = transfer_buffer_->AllocUpTo(kSize3, &size_allocated);
	EXPECT_EQ(kSize2, size_allocated);
	EXPECT_EQ(kSize2, transfer_buffer_->GetCurrentMaxAllocationWithoutRealloc());
	transfer_buffer_->FreePendingToken(ptr, 1);
	}

	TEST_F(TransferBufferExpandContractTest, Contract) {
	// Check it starts at starting size.
	EXPECT_EQ(
	kStartTransferBufferSize - kStartingOffset,
	transfer_buffer_->GetCurrentMaxAllocationWithoutRealloc());

	// Free buffer.
	EXPECT_CALL(*command_buffer(), DestroyTransferBuffer(_))
	.Times(1)
	.RetiresOnSaturation();
	transfer_buffer_->Free();
	// See it's freed.
	EXPECT_FALSE(transfer_buffer_->HaveBuffer());

	// Try to allocate again, fail first request
	EXPECT_CALL(*command_buffer(),
	CreateTransferBuffer(kStartTransferBufferSize, _))
	.WillOnce(
	DoAll(SetArgPointee<1>(-1), Return(scoped_refptr<gpu::Buffer>())))
	.RetiresOnSaturation();
	EXPECT_CALL(*command_buffer(),
	CreateTransferBuffer(kMinTransferBufferSize, _))
	.WillOnce(Invoke(
	command_buffer(),
	&MockClientCommandBufferCanFail::RealCreateTransferBuffer))
	.RetiresOnSaturation();

	const size_t kSize1 = 256 - kStartingOffset;
	const size_t kSize2 = 128 - kStartingOffset;
	unsigned int size_allocated = 0;
	void* ptr = transfer_buffer_->AllocUpTo(kSize1, &size_allocated);
	ASSERT_TRUE(ptr != NULL);
	EXPECT_EQ(kSize2, size_allocated);
	EXPECT_EQ(kSize2, transfer_buffer_->GetCurrentMaxAllocationWithoutRealloc());
	transfer_buffer_->FreePendingToken(ptr, 1);

	// Free buffer.
	EXPECT_CALL(*command_buffer(), DestroyTransferBuffer(_))
	.Times(1)
	.RetiresOnSaturation();
	transfer_buffer_->Free();
	// See it's freed.
	EXPECT_FALSE(transfer_buffer_->HaveBuffer());

	// Try to allocate again,
	EXPECT_CALL(*command_buffer(),
	CreateTransferBuffer(kMinTransferBufferSize, _))
	.WillOnce(Invoke(
	command_buffer(),
	&MockClientCommandBufferCanFail::RealCreateTransferBuffer))
	.RetiresOnSaturation();

	ptr = transfer_buffer_->AllocUpTo(kSize1, &size_allocated);
	ASSERT_TRUE(ptr != NULL);
	EXPECT_EQ(kSize2, size_allocated);
	EXPECT_EQ(kSize2, transfer_buffer_->GetCurrentMaxAllocationWithoutRealloc());
	transfer_buffer_->FreePendingToken(ptr, 1);
	}

	TEST_F(TransferBufferExpandContractTest, OutOfMemory) {
	// Free buffer.
	EXPECT_CALL(*command_buffer(), DestroyTransferBuffer(_))
	.Times(1)
	.RetiresOnSaturation();
	transfer_buffer_->Free();
	// See it's freed.
	EXPECT_FALSE(transfer_buffer_->HaveBuffer());

	// Try to allocate again, fail both requests.
	EXPECT_CALL(*command_buffer(), CreateTransferBuffer(_, _))
	.WillOnce(
	DoAll(SetArgPointee<1>(-1), Return(scoped_refptr<gpu::Buffer>())))
	.WillOnce(
	DoAll(SetArgPointee<1>(-1), Return(scoped_refptr<gpu::Buffer>())))
	.WillOnce(
	DoAll(SetArgPointee<1>(-1), Return(scoped_refptr<gpu::Buffer>())))
	.RetiresOnSaturation();

	const size_t kSize1 = 512 - kStartingOffset;
	unsigned int size_allocated = 0;
	void* ptr = transfer_buffer_->AllocUpTo(kSize1, &size_allocated);
	ASSERT_TRUE(ptr == NULL);
	EXPECT_FALSE(transfer_buffer_->HaveBuffer());
	}

	TEST_F(TransferBufferExpandContractTest, ReallocsToDefault) {
	// Free buffer.
	EXPECT_CALL(*command_buffer(), DestroyTransferBuffer(_))
	.Times(1)
	.RetiresOnSaturation();
	transfer_buffer_->Free();
	// See it's freed.
	EXPECT_FALSE(transfer_buffer_->HaveBuffer());

	// See that it gets reallocated.
	EXPECT_CALL(*command_buffer(),
	CreateTransferBuffer(kStartTransferBufferSize, _))
	.WillOnce(Invoke(
	command_buffer(),
	&MockClientCommandBufferCanFail::RealCreateTransferBuffer))
	.RetiresOnSaturation();
	EXPECT_EQ(transfer_buffer_id_, transfer_buffer_->GetShmId());
	EXPECT_TRUE(transfer_buffer_->HaveBuffer());

	// Check it's the default size.
	EXPECT_EQ(
	kStartTransferBufferSize - kStartingOffset,
	transfer_buffer_->GetCurrentMaxAllocationWithoutRealloc());
	}

	} // namespace gpu