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| 1 /* |
| 2 * Copyright 2016 Google Inc. |
| 3 * |
| 4 * Use of this source code is governed by a BSD-style license that can be |
| 5 * found in the LICENSE file. |
| 6 */ |
| 7 |
| 8 #ifndef GpuTimer_DEFINED |
| 9 #define GpuTimer_DEFINED |
| 10 |
| 11 #include "SkTypes.h" |
| 12 #include "SkExchange.h" |
| 13 #include <chrono> |
| 14 |
| 15 namespace sk_gpu_test { |
| 16 |
| 17 using PlatformTimerQuery = uint64_t; |
| 18 static constexpr PlatformTimerQuery kInvalidTimerQuery = 0; |
| 19 |
| 20 /** |
| 21 * Platform-independent interface for timing operations on the GPU. |
| 22 */ |
| 23 class GpuTimer { |
| 24 public: |
| 25 GpuTimer(bool disjointSupport) |
| 26 : fDisjointSupport(disjointSupport) |
| 27 , fActiveTimer(kInvalidTimerQuery) { |
| 28 } |
| 29 virtual ~GpuTimer() { SkASSERT(!fActiveTimer); } |
| 30 |
| 31 /** |
| 32 * Returns whether this timer can detect disjoint GPU operations while timin
g. If false, a query |
| 33 * has less confidence when it completes with QueryStatus::kAccurate. |
| 34 */ |
| 35 bool disjointSupport() const { return fDisjointSupport; } |
| 36 |
| 37 /** |
| 38 * Inserts a "start timing" command in the GPU command stream. |
| 39 */ |
| 40 void queueStart() { |
| 41 SkASSERT(!fActiveTimer); |
| 42 fActiveTimer = this->onQueueTimerStart(); |
| 43 } |
| 44 |
| 45 /** |
| 46 * Inserts a "stop timing" command in the GPU command stream. |
| 47 * |
| 48 * @return a query object that can retrieve the time elapsed once the timer
has completed. |
| 49 */ |
| 50 PlatformTimerQuery SK_WARN_UNUSED_RESULT queueStop() { |
| 51 SkASSERT(fActiveTimer); |
| 52 this->onQueueTimerStop(fActiveTimer); |
| 53 return skstd::exchange(fActiveTimer, kInvalidTimerQuery); |
| 54 } |
| 55 |
| 56 enum class QueryStatus { |
| 57 kInvalid, //<! the timer query is invalid. |
| 58 kPending, //<! the timer is still running on the GPU. |
| 59 kDisjoint, //<! the query is complete, but dubious due to disjoint GPU o
perations. |
| 60 kAccurate //<! the query is complete and reliable. |
| 61 }; |
| 62 |
| 63 virtual QueryStatus checkQueryStatus(PlatformTimerQuery) = 0; |
| 64 virtual std::chrono::nanoseconds getTimeElapsed(PlatformTimerQuery) = 0; |
| 65 virtual void deleteQuery(PlatformTimerQuery) = 0; |
| 66 |
| 67 private: |
| 68 virtual PlatformTimerQuery onQueueTimerStart() const = 0; |
| 69 virtual void onQueueTimerStop(PlatformTimerQuery) const = 0; |
| 70 |
| 71 bool const fDisjointSupport; |
| 72 PlatformTimerQuery fActiveTimer; |
| 73 }; |
| 74 |
| 75 } // namespace sk_gpu_test |
| 76 |
| 77 #endif |
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