| /* |
| * Copyright 2016 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #ifndef GpuTimer_DEFINED |
| #define GpuTimer_DEFINED |
| |
| #include "include/core/SkTypes.h" |
| |
| #include <chrono> |
| |
| namespace sk_gpu_test { |
| |
| using PlatformTimerQuery = uint64_t; |
| static constexpr PlatformTimerQuery kInvalidTimerQuery = 0; |
| |
| /** |
| * Platform-independent interface for timing operations on the GPU. |
| */ |
| class GpuTimer { |
| public: |
| GpuTimer(bool disjointSupport) |
| : fDisjointSupport(disjointSupport) |
| , fActiveTimer(kInvalidTimerQuery) { |
| } |
| virtual ~GpuTimer() { SkASSERT(!fActiveTimer); } |
| |
| /** |
| * Returns whether this timer can detect disjoint GPU operations while timing. If false, a query |
| * has less confidence when it completes with QueryStatus::kAccurate. |
| */ |
| bool disjointSupport() const { return fDisjointSupport; } |
| |
| /** |
| * Inserts a "start timing" command in the GPU command stream. |
| */ |
| void queueStart() { |
| SkASSERT(!fActiveTimer); |
| fActiveTimer = this->onQueueTimerStart(); |
| } |
| |
| /** |
| * Inserts a "stop timing" command in the GPU command stream. |
| * |
| * @return a query object that can retrieve the time elapsed once the timer has completed. |
| */ |
| [[nodiscard]] PlatformTimerQuery queueStop() { |
| SkASSERT(fActiveTimer); |
| this->onQueueTimerStop(fActiveTimer); |
| return std::exchange(fActiveTimer, kInvalidTimerQuery); |
| } |
| |
| enum class QueryStatus { |
| kInvalid, //<! the timer query is invalid. |
| kPending, //<! the timer is still running on the GPU. |
| kDisjoint, //<! the query is complete, but dubious due to disjoint GPU operations. |
| kAccurate //<! the query is complete and reliable. |
| }; |
| |
| virtual QueryStatus checkQueryStatus(PlatformTimerQuery) = 0; |
| virtual std::chrono::nanoseconds getTimeElapsed(PlatformTimerQuery) = 0; |
| virtual void deleteQuery(PlatformTimerQuery) = 0; |
| |
| private: |
| virtual PlatformTimerQuery onQueueTimerStart() const = 0; |
| virtual void onQueueTimerStop(PlatformTimerQuery) const = 0; |
| |
| bool const fDisjointSupport; |
| PlatformTimerQuery fActiveTimer; |
| }; |
| |
| } // namespace sk_gpu_test |
| |
| #endif |