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- /*
- * 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 "src/core/SkExchange.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.
- */
- PlatformTimerQuery SK_WARN_UNUSED_RESULT queueStop() {
- SkASSERT(fActiveTimer);
- this->onQueueTimerStop(fActiveTimer);
- return skstd::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
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