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/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "TimingStateMachine.h"
#include "SkCanvas.h"
#include "SkCommandLineFlags.h"
DEFINE_int32(gpuFrameLag, 5, "Overestimate of maximum number of frames GPU is allowed to lag.");
DEFINE_int32(frames, 5, "Number of frames of each skp to render per sample.");
DEFINE_double(loopMs, 5, "Each benchmark will be tuned until it takes loopsMs millseconds.");
static double now_ms() { return SkTime::GetNSecs() * 1e-6; }
TimingStateMachine::TimingStateMachine()
: fCurrentFrame(0)
, fLoops(1)
, fLastMeasurement(0.)
, fState(kPreWarm_State)
, fInnerState(kTuning_InnerState) {
}
TimingStateMachine::ParentEvents TimingStateMachine::nextFrame(bool preWarmBetweenSamples) {
ParentEvents parentEvent = kTiming_ParentEvents;
switch (fState) {
case kPreWarm_State: {
if (fCurrentFrame >= FLAGS_gpuFrameLag) {
fCurrentFrame = 0;
fStartTime = now_ms();
fState = kTiming_State;
} else {
fCurrentFrame++;
}
break;
}
case kTiming_State: {
switch (fInnerState) {
case kTuning_InnerState: {
if (1 << 30 == fLoops) {
// We're about to wrap. Something's wrong with the bench.
SkDebugf("InnerLoops wrapped\n");
fLoops = 1;
} else {
double elapsedMs = now_ms() - fStartTime;
if (elapsedMs < FLAGS_loopMs) {
fLoops *= 2;
} else {
fInnerState = kTiming_InnerState;
}
fState = kPreWarm_State;
fCurrentFrame = 0;
parentEvent = kReset_ParentEvents;
}
break;
}
case kTiming_InnerState: {
if (fCurrentFrame >= FLAGS_frames) {
double now = now_ms();
fLastMeasurement = (now - fStartTime) / (FLAGS_frames * fLoops);
fCurrentFrame = 0;
parentEvent = kTimingFinished_ParentEvents;
if (preWarmBetweenSamples) {
fState = kPreWarm_State;
} else {
fStartTime = now;
}
} else {
fCurrentFrame++;
}
break;
}
}
}
break;
}
return parentEvent;
}
void TimingStateMachine::nextBenchmark() {
fLoops = 1;
fInnerState = kTuning_InnerState;
fState = kPreWarm_State;
}
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