Add WIP Engine::step() timer. Fix module timer.

include/system.hpp

@@ -106,10 +106,10 @@ Examples:
 std::string getExtension(const std::string& path);
 
 /** Compresses the contents of a folder (recursively) to an archive.
-Currently supports the "ustar zstd" format (.tar.zst)
+Uses the Unix Standard TAR + Zstandard format (.tar.zst).
 An equivalent shell command is
 
-	tar -cf archivePath --zstd -C folderPath .
+	ZSTD_CLEVEL=1 tar -cf archivePath --zstd -C folderPath .
 */
 void archiveFolder(const std::string& archivePath, const std::string& folderPath, int compressionLevel = 1);
 /** Extracts an archive into a folder.

src/app/ModuleWidget.cpp

@@ -505,6 +505,7 @@ void ModuleWidget::onHoverKey(const event::HoverKey& e) {
 void ModuleWidget::onDragStart(const event::DragStart& e) {
 	if (e.button == GLFW_MOUSE_BUTTON_LEFT) {
 		internal->dragPos = APP->scene->rack->mousePos.minus(box.pos);
+		DEBUG("drag (%f, %f)", VEC_ARGS(internal->dragPos));
 		APP->scene->rack->updateModuleOldPositions();
 	}
 }

src/engine/Engine.cpp

@@ -352,7 +352,7 @@ static void Engine_stepModulesWorker(Engine* that, int threadId) {
 		// Stop CPU timer
 		if (cpuMeter) {
 			double endTime = system::getTime();
-			float duration = (endTime - startTime) / 1e9;
+			float duration = endTime - startTime;
 
 			// Smooth CPU time
 			const float cpuTau = 2.f /* seconds */;
@@ -571,6 +571,7 @@ void Engine::step(int frames) {
 	if (internal->sampleRate != settings::sampleRate) {
 		internal->sampleRate = settings::sampleRate;
 		internal->sampleTime = 1.f / internal->sampleRate;
+		// Trigger SampleRateChangeEvent
 		Module::SampleRateChangeEvent e;
 		e.sampleRate = internal->sampleRate;
 		e.sampleTime = internal->sampleTime;
@@ -594,6 +595,11 @@ void Engine::step(int frames) {
 	}
 
 	yieldWorkers();
+
+	double endTime = system::getTime();
+	float duration = endTime - internal->stepTime;
+	float stepDuration = internal->stepFrames * internal->sampleTime;
+	DEBUG("%d %f / %f = %f%%", internal->stepFrames, duration, stepDuration, duration / stepDuration * 100.f);
 }