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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 = intptr_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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