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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 // 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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76 | 76 |
77 // Inserts a new token into the command buffer. This token either has a value | 77 // Inserts a new token into the command buffer. This token either has a value |
78 // different from previously inserted tokens, or ensures that previously | 78 // different from previously inserted tokens, or ensures that previously |
79 // inserted tokens with that value have already passed through the command | 79 // inserted tokens with that value have already passed through the command |
80 // stream. | 80 // stream. |
81 // Returns: | 81 // Returns: |
82 // the value of the new token or -1 if the command buffer reader has | 82 // the value of the new token or -1 if the command buffer reader has |
83 // shutdown. | 83 // shutdown. |
84 int32 InsertToken(); | 84 int32 InsertToken(); |
85 | 85 |
| 86 // Returns true if the token has already passed. |
| 87 // Parameters: |
| 88 // the value of the token to check whether it has passed |
| 89 bool HasTokenPassed(int32 token) const { |
| 90 if (token > token_) |
| 91 return true; // we wrapped |
| 92 return last_token_read() >= token; |
| 93 } |
| 94 |
86 // Waits until the token of a particular value has passed through the command | 95 // Waits until the token of a particular value has passed through the command |
87 // stream (i.e. commands inserted before that token have been executed). | 96 // stream (i.e. commands inserted before that token have been executed). |
88 // NOTE: This will call Flush if it needs to block. | 97 // NOTE: This will call Flush if it needs to block. |
89 // Parameters: | 98 // Parameters: |
90 // the value of the token to wait for. | 99 // the value of the token to wait for. |
91 void WaitForToken(int32 token); | 100 void WaitForToken(int32 token); |
92 | 101 |
| 102 // Get the serial number last read by the command buffer. |
| 103 uint32 last_serial_read() const { |
| 104 return command_buffer_->GetLastState().serial; |
| 105 } |
| 106 |
93 // Called prior to each command being issued. Waits for a certain amount of | 107 // Called prior to each command being issued. Waits for a certain amount of |
94 // space to be available. Returns address of space. | 108 // space to be available. Returns address of space. |
95 CommandBufferEntry* GetSpace(uint32 entries); | 109 CommandBufferEntry* GetSpace(uint32 entries); |
96 | 110 |
97 // Typed version of GetSpace. Gets enough room for the given type and returns | 111 // Typed version of GetSpace. Gets enough room for the given type and returns |
98 // a reference to it. | 112 // a reference to it. |
99 template <typename T> | 113 template <typename T> |
100 T* GetCmdSpace() { | 114 T* GetCmdSpace() { |
101 COMPILE_ASSERT(T::kArgFlags == cmd::kFixed, Cmd_kArgFlags_not_kFixed); | 115 COMPILE_ASSERT(T::kArgFlags == cmd::kFixed, Cmd_kArgFlags_not_kFixed); |
102 uint32 space_needed = ComputeNumEntries(sizeof(T)); | 116 uint32 space_needed = ComputeNumEntries(sizeof(T)); |
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261 // Using C runtime instead of base because this file cannot depend on base. | 275 // Using C runtime instead of base because this file cannot depend on base. |
262 clock_t last_flush_time_; | 276 clock_t last_flush_time_; |
263 | 277 |
264 friend class CommandBufferHelperTest; | 278 friend class CommandBufferHelperTest; |
265 DISALLOW_COPY_AND_ASSIGN(CommandBufferHelper); | 279 DISALLOW_COPY_AND_ASSIGN(CommandBufferHelper); |
266 }; | 280 }; |
267 | 281 |
268 } // namespace gpu | 282 } // namespace gpu |
269 | 283 |
270 #endif // GPU_COMMAND_BUFFER_CLIENT_CMD_BUFFER_HELPER_H_ | 284 #endif // GPU_COMMAND_BUFFER_CLIENT_CMD_BUFFER_HELPER_H_ |
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