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1 // Copyright (c) 2009 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2009 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 // This file contains the command buffer helper class. | 5 // This file contains the command buffer helper class. |
6 | 6 |
7 #ifndef GPU_COMMAND_BUFFER_CLIENT_CMD_BUFFER_HELPER_H_ | 7 #ifndef GPU_COMMAND_BUFFER_CLIENT_CMD_BUFFER_HELPER_H_ |
8 #define GPU_COMMAND_BUFFER_CLIENT_CMD_BUFFER_HELPER_H_ | 8 #define GPU_COMMAND_BUFFER_CLIENT_CMD_BUFFER_HELPER_H_ |
9 | 9 |
10 #include <string.h> | 10 #include <string.h> |
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195 shared_memory_id, | 195 shared_memory_id, |
196 shared_memory_offset); | 196 shared_memory_offset); |
197 } | 197 } |
198 | 198 |
199 private: | 199 private: |
200 // Waits until get changes, updating the value of get_. | 200 // Waits until get changes, updating the value of get_. |
201 void WaitForGetChange(); | 201 void WaitForGetChange(); |
202 | 202 |
203 // Returns the number of available entries (they may not be contiguous). | 203 // Returns the number of available entries (they may not be contiguous). |
204 int32 AvailableEntries() { | 204 int32 AvailableEntries() { |
205 return (get_ - put_ - 1 + entry_count_) % entry_count_; | 205 return (get_ - put_ - 1 + usable_entry_count_) % usable_entry_count_; |
206 } | 206 } |
207 | 207 |
208 // Synchronize with current service state. | 208 // Synchronize with current service state. |
209 void SynchronizeState(CommandBuffer::State state); | 209 void SynchronizeState(CommandBuffer::State state); |
210 | 210 |
211 CommandBuffer* command_buffer_; | 211 CommandBuffer* command_buffer_; |
212 Buffer ring_buffer_; | 212 Buffer ring_buffer_; |
213 CommandBufferEntry *entries_; | 213 CommandBufferEntry *entries_; |
214 int32 entry_count_; | 214 int32 total_entry_count_; // the total number of entries |
| 215 int32 usable_entry_count_; // the usable number (ie, minus space for jump) |
215 int32 token_; | 216 int32 token_; |
216 int32 last_token_read_; | 217 int32 last_token_read_; |
217 int32 get_; | 218 int32 get_; |
218 int32 put_; | 219 int32 put_; |
219 | 220 |
220 friend class CommandBufferHelperTest; | 221 friend class CommandBufferHelperTest; |
221 DISALLOW_COPY_AND_ASSIGN(CommandBufferHelper); | 222 DISALLOW_COPY_AND_ASSIGN(CommandBufferHelper); |
222 }; | 223 }; |
223 | 224 |
224 } // namespace gpu | 225 } // namespace gpu |
225 | 226 |
226 #endif // GPU_COMMAND_BUFFER_CLIENT_CMD_BUFFER_HELPER_H_ | 227 #endif // GPU_COMMAND_BUFFER_CLIENT_CMD_BUFFER_HELPER_H_ |
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