Alex Vakulenko | e4eec20 | 2017-01-27 14:41:04 -0800 | [diff] [blame^] | 1 | #ifndef ANDROID_DVR_GRAPHICS_TIMER_QUERY_H_ |
| 2 | #define ANDROID_DVR_GRAPHICS_TIMER_QUERY_H_ |
| 3 | |
| 4 | #include <GLES3/gl3.h> |
| 5 | |
| 6 | namespace android { |
| 7 | namespace dvr { |
| 8 | |
| 9 | // Class used to asynchronously query time between draw calls on gpu. |
| 10 | class TimerQuery { |
| 11 | public: |
| 12 | TimerQuery(); |
| 13 | ~TimerQuery(); |
| 14 | |
| 15 | // Marks the start of the timer on gpu. |
| 16 | void Begin(); |
| 17 | |
| 18 | // Marks the end of the timer on gpu. |
| 19 | void End(); |
| 20 | |
| 21 | // Gets the time that has passed from call to Begin to End. |
| 22 | // Should be called only after the frame has been presented (after the call to |
| 23 | // swapbuffers). |
| 24 | double GetTimeInMS(); |
| 25 | |
| 26 | private: |
| 27 | // Generates OpenGL query object. |
| 28 | void Init(); |
| 29 | // Deletes OpenGL query object. |
| 30 | void Delete(); |
| 31 | |
| 32 | GLuint query_ = 0; |
| 33 | |
| 34 | friend class SyncTimerQuery; |
| 35 | }; |
| 36 | |
| 37 | // Simplification of TimerQuery that allows to synchronously query time used |
| 38 | // for draw calls on gpu by doing glFlush and stalling cpu. |
| 39 | class SyncTimerQuery { |
| 40 | public: |
| 41 | SyncTimerQuery(); |
| 42 | |
| 43 | double FlushAndGetTimeInMS(); // Note: This WILL cause a glFlush() |
| 44 | |
| 45 | private: |
| 46 | TimerQuery timer_; |
| 47 | }; |
| 48 | |
| 49 | } // namespace dvr |
| 50 | } // namespace android |
| 51 | |
| 52 | #endif // ANDROID_DVR_GRAPHICS_TIMER_QUERY_H_ |