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