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Add comments to clarify per-frame profiler #1039

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Merged
vauduong merged 4 commits into from
Jan 22, 2021
Merged

Add comments to clarify per-frame profiler #1039

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fd0242e
Add comments to clarify per frame profiler
vauduong Jan 19, 2021
af8a693
Lint
vauduong Jan 20, 2021
cbc8a3f
Update with master, improve comments
vauduong Jan 21, 2021
c19042b
Update with feedback
vauduong Jan 22, 2021
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33 changes: 30 additions & 3 deletions src/utils/viewer/viewer.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -545,7 +545,23 @@ Viewer::Viewer(const Arguments& arguments)
objectPickingHelper_ = std::make_unique<ObjectPickingHelper>(viewportSize);
timeline_.start();

// Set up per frame profiler
/**
* Set up per frame profiler to be aware of bottlenecking in processing data
* Interpretation: CpuDuration should be less than GpuDuration to avoid GPU
* idling, and CpuDuration and GpuDuration should be roughly equal for faster
* rendering times
*
* FrameTime: (Units::Nanoseconds) Time to render per frame, 1/FPS
*
* CpuDuration: (Units::Nanoseconds) CPU time spent processing events,
* physics, traversing SceneGraph, and submitting data to GPU/drivers per
* frame
*
* GpuDuration: (Units::Nanoseconds) Measures how much time it takes for the
* GPU to process all work submitted by CPU Uses asynchronous querying to
* measure the amount of time to fully complete a set of GL commands without
* stalling rendering
*/
Mn::DebugTools::GLFrameProfiler::Values profilerValues =
Mn::DebugTools::GLFrameProfiler::Value::FrameTime |
Mn::DebugTools::GLFrameProfiler::Value::CpuDuration |
Expand All @@ -557,11 +573,17 @@ Viewer::Viewer(const Arguments& arguments)
.isExtensionSupported<
Mn::GL::Extensions::ARB::pipeline_statistics_query>()) {
profilerValues |=
Mn::DebugTools::GLFrameProfiler::Value::VertexFetchRatio |
Mn::DebugTools::GLFrameProfiler::Value::PrimitiveClipRatio;
Mn::DebugTools::GLFrameProfiler::Value::
VertexFetchRatio | // Ratio of vertex shader invocations to count
// of vertices submitted
Mn::DebugTools::GLFrameProfiler::Value::
PrimitiveClipRatio; // Ratio of primitives discarded by the
// clipping stage to count of primitives
// submitted
}
#endif

// Per frame profiler will average measurements taken over previous 50 frames
profiler_.setup(profilerValues, 50);

printHelpText();
Expand Down Expand Up @@ -825,7 +847,10 @@ void Viewer::wiggleLastObject() {

float timeSinceLastSimulation = 0.0;
void Viewer::drawEvent() {
// Wrap profiler measurements around all methods to render images from
// RenderCamera
profiler_.beginFrame();

Mn::GL::defaultFramebuffer.clear(Mn::GL::FramebufferClear::Color |
Mn::GL::FramebufferClear::Depth);

Expand Down Expand Up @@ -911,7 +936,9 @@ void Viewer::drawEvent() {
Mn::GL::defaultFramebuffer.bind();
}

// Do not include ImGui content drawing in per frame profiler measurements
profiler_.endFrame();

// Immediately bind the main buffer back so that the "imgui" below can work
// properly
Mn::GL::defaultFramebuffer.bind();
Expand Down