123 lines
4.0 KiB
C++
123 lines
4.0 KiB
C++
/*
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* Copyright 2015 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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#include "TimingStateMachine.h"
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#include "SkCanvas.h"
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#include "SkCommandLineFlags.h"
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DEFINE_int32(gpuFrameLag, 5, "Overestimate of maximum number of frames GPU is allowed to lag.");
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DEFINE_int32(frames, 5, "Number of frames of each skp to render per sample.");
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DEFINE_double(loopMs, 5, "Each benchmark will be tuned until it takes loopsMs millseconds.");
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TimingStateMachine::TimingStateMachine()
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: fCurrentFrame(0)
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, fLoops(1)
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, fLastMeasurement(0.)
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, fState(kPreWarmLoopsPerCanvasPreDraw_State) {
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}
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TimingStateMachine::ParentEvents TimingStateMachine::nextFrame(SkCanvas* canvas,
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Benchmark* benchmark) {
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switch (fState) {
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case kPreWarmLoopsPerCanvasPreDraw_State:
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return this->perCanvasPreDraw(canvas, benchmark, kPreWarmLoops_State);
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case kPreWarmLoops_State:
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return this->preWarm(kTuneLoops_State);
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case kTuneLoops_State:
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return this->tuneLoops();
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case kPreWarmTimingPerCanvasPreDraw_State:
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return this->perCanvasPreDraw(canvas, benchmark, kPreWarmTiming_State);
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case kPreWarmTiming_State:
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return this->preWarm(kTiming_State);
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case kTiming_State:
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return this->timing(canvas, benchmark);
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}
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SkFAIL("Incomplete switch\n");
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return kTiming_ParentEvents;
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}
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inline void TimingStateMachine::nextState(State nextState) {
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fState = nextState;
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}
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TimingStateMachine::ParentEvents TimingStateMachine::perCanvasPreDraw(SkCanvas* canvas,
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Benchmark* benchmark,
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State nextState) {
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benchmark->perCanvasPreDraw(canvas);
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benchmark->preDraw(canvas);
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fCurrentFrame = 0;
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this->nextState(nextState);
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return kTiming_ParentEvents;
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}
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TimingStateMachine::ParentEvents TimingStateMachine::preWarm(State nextState) {
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if (fCurrentFrame >= FLAGS_gpuFrameLag) {
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// we currently time across all frames to make sure we capture all GPU work
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this->nextState(nextState);
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fCurrentFrame = 0;
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fTimer.start();
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} else {
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fCurrentFrame++;
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}
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return kTiming_ParentEvents;
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}
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inline double TimingStateMachine::elapsed() {
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fTimer.end();
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return fTimer.fWall;
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}
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void TimingStateMachine::resetTimingState() {
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fCurrentFrame = 0;
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fTimer = WallTimer();
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}
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inline TimingStateMachine::ParentEvents TimingStateMachine::tuneLoops() {
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if (1 << 30 == fLoops) {
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// We're about to wrap. Something's wrong with the bench.
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SkDebugf("InnerLoops wrapped\n");
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fLoops = 1;
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return kTiming_ParentEvents;
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} else {
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double elapsedMs = this->elapsed();
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if (elapsedMs > FLAGS_loopMs) {
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this->nextState(kPreWarmTimingPerCanvasPreDraw_State);
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} else {
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fLoops *= 2;
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this->nextState(kPreWarmLoops_State);
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}
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this->resetTimingState();
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return kReset_ParentEvents;
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}
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}
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void TimingStateMachine::recordMeasurement() {
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fLastMeasurement = this->elapsed() / (FLAGS_frames * fLoops);
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}
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void TimingStateMachine::nextBenchmark(SkCanvas* canvas, Benchmark* benchmark) {
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benchmark->postDraw(canvas);
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benchmark->perCanvasPostDraw(canvas);
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fLoops = 1;
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this->nextState(kPreWarmLoopsPerCanvasPreDraw_State);
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}
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inline TimingStateMachine::ParentEvents TimingStateMachine::timing(SkCanvas* canvas,
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Benchmark* benchmark) {
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if (fCurrentFrame >= FLAGS_frames) {
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this->recordMeasurement();
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this->resetTimingState();
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this->nextState(kPreWarmTimingPerCanvasPreDraw_State);
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return kTimingFinished_ParentEvents;
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} else {
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fCurrentFrame++;
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return kTiming_ParentEvents;
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}
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}
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