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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 // A class to Manage a growing transfer buffer. | 5 // A class to Manage a growing transfer buffer. |
6 | 6 |
7 #include "gpu/command_buffer/client/transfer_buffer.h" | 7 #include "gpu/command_buffer/client/transfer_buffer.h" |
8 | 8 |
9 #include "base/bits.h" | 9 #include "base/bits.h" |
10 #include "base/debug/trace_event.h" | 10 #include "base/debug/trace_event.h" |
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58 buffer_id_ = -1; | 58 buffer_id_ = -1; |
59 buffer_ = NULL; | 59 buffer_ = NULL; |
60 result_buffer_ = NULL; | 60 result_buffer_ = NULL; |
61 result_shm_offset_ = 0; | 61 result_shm_offset_ = 0; |
62 ring_buffer_.reset(); | 62 ring_buffer_.reset(); |
63 bytes_since_last_flush_ = 0; | 63 bytes_since_last_flush_ = 0; |
64 } | 64 } |
65 } | 65 } |
66 | 66 |
67 bool TransferBuffer::HaveBuffer() const { | 67 bool TransferBuffer::HaveBuffer() const { |
68 DCHECK(buffer_id_ == -1 || buffer_); | 68 DCHECK(buffer_id_ == -1 || buffer_.get()); |
69 return buffer_id_ != -1; | 69 return buffer_id_ != -1; |
70 } | 70 } |
71 | 71 |
72 RingBuffer::Offset TransferBuffer::GetOffset(void* pointer) const { | 72 RingBuffer::Offset TransferBuffer::GetOffset(void* pointer) const { |
73 return ring_buffer_->GetOffset(pointer); | 73 return ring_buffer_->GetOffset(pointer); |
74 } | 74 } |
75 | 75 |
76 void TransferBuffer::FreePendingToken(void* p, unsigned int token) { | 76 void TransferBuffer::FreePendingToken(void* p, unsigned int token) { |
77 ring_buffer_->FreePendingToken(p, token); | 77 ring_buffer_->FreePendingToken(p, token); |
78 if (bytes_since_last_flush_ >= size_to_flush_ && size_to_flush_ > 0) { | 78 if (bytes_since_last_flush_ >= size_to_flush_ && size_to_flush_ > 0) { |
79 helper_->Flush(); | 79 helper_->Flush(); |
80 bytes_since_last_flush_ = 0; | 80 bytes_since_last_flush_ = 0; |
81 } | 81 } |
82 } | 82 } |
83 | 83 |
84 void TransferBuffer::AllocateRingBuffer(unsigned int size) { | 84 void TransferBuffer::AllocateRingBuffer(unsigned int size) { |
85 for (;size >= min_buffer_size_; size /= 2) { | 85 for (;size >= min_buffer_size_; size /= 2) { |
86 int32 id = -1; | 86 int32 id = -1; |
87 scoped_refptr<gpu::Buffer> buffer = | 87 scoped_refptr<gpu::Buffer> buffer = |
88 helper_->command_buffer()->CreateTransferBuffer(size, &id); | 88 helper_->command_buffer()->CreateTransferBuffer(size, &id); |
89 if (id != -1) { | 89 if (id != -1) { |
90 DCHECK(buffer); | 90 DCHECK(buffer.get()); |
91 buffer_ = buffer; | 91 buffer_ = buffer; |
92 ring_buffer_.reset(new RingBuffer( | 92 ring_buffer_.reset(new RingBuffer( |
93 alignment_, | 93 alignment_, |
94 result_size_, | 94 result_size_, |
95 buffer_->size() - result_size_, | 95 buffer_->size() - result_size_, |
96 helper_, | 96 helper_, |
97 static_cast<char*>(buffer_->memory()) + result_size_)); | 97 static_cast<char*>(buffer_->memory()) + result_size_)); |
98 buffer_id_ = id; | 98 buffer_id_ = id; |
99 result_buffer_ = buffer_->memory(); | 99 result_buffer_ = buffer_->memory(); |
100 result_shm_offset_ = 0; | 100 result_shm_offset_ = 0; |
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192 Release(); | 192 Release(); |
193 // NOTE: we allocate buffers of size 0 so that HaveBuffer will be true, so | 193 // NOTE: we allocate buffers of size 0 so that HaveBuffer will be true, so |
194 // that address will return a pointer just like malloc, and so that GetShmId | 194 // that address will return a pointer just like malloc, and so that GetShmId |
195 // will be valid. That has the side effect that we'll insert a token on free. | 195 // will be valid. That has the side effect that we'll insert a token on free. |
196 // We could add code skip the token for a zero size buffer but it doesn't seem | 196 // We could add code skip the token for a zero size buffer but it doesn't seem |
197 // worth the complication. | 197 // worth the complication. |
198 buffer_ = transfer_buffer_->AllocUpTo(new_size, &size_); | 198 buffer_ = transfer_buffer_->AllocUpTo(new_size, &size_); |
199 } | 199 } |
200 | 200 |
201 } // namespace gpu | 201 } // namespace gpu |
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