Add Engine::threadCount to toolbar menu and settings.json

include/system.hpp

@@ -13,6 +13,8 @@ bool isDirectory(const std::string &path);
 void copyFile(const std::string &srcPath, const std::string &destPath);
 void createDirectory(const std::string &path);
 
+/** Currently this lies and returns the number of logical cores instead. */
+int getPhysicalCoreCount();
 void setThreadName(const std::string &name);
 
 /** Opens a URL, also happens to work with PDFs and folders.

src/app/Toolbar.cpp

@@ -299,6 +299,35 @@ struct SampleRateItem : MenuItem {
 };
 
 
+struct ThreadCountValueItem : MenuItem {
+	int threadCount;
+	ThreadCountValueItem(int threadCount) {
+		this->threadCount = threadCount;
+		text = string::f("%d", threadCount);
+		rightText = CHECKMARK(app()->engine->threadCount == threadCount);
+	}
+	void onAction(const event::Action &e) override {
+		app()->engine->threadCount = threadCount;
+	}
+};
+
+
+struct ThreadCount : MenuItem {
+	ThreadCount() {
+		text = "Thread count";
+	}
+	Menu *createChildMenu() override {
+		Menu *menu = new Menu;
+
+		int coreCount = system::getPhysicalCoreCount();
+		for (int i = 1; i <= coreCount; i++) {
+			menu->addChild(new ThreadCountValueItem(i));
+		}
+		return menu;
+	}
+};
+
+
 struct FullscreenItem : MenuItem {
 	FullscreenItem() {
 		text = "Fullscreen";
@@ -325,6 +354,7 @@ struct SettingsButton : MenuButton {
 		menu->addChild(new PowerMeterItem);
 		menu->addChild(new LockModulesItem);
 		menu->addChild(new SampleRateItem);
+		menu->addChild(new ThreadCount);
 		menu->addChild(new FullscreenItem);
 
 		Slider *zoomSlider = new Slider;

src/settings.cpp

@@ -68,6 +68,9 @@ static json_t *settingsToJson() {
 	// powerMeter
 	json_object_set_new(rootJ, "powerMeter", json_boolean(powerMeter));
 
+	// threadCount
+	json_object_set_new(rootJ, "threadCount", json_integer(app()->engine->threadCount));
+
 	// checkVersion
 	json_object_set_new(rootJ, "checkVersion", json_boolean(checkVersion));
 
@@ -146,6 +149,11 @@ static void settingsFromJson(json_t *rootJ) {
 	if (powerMeterJ)
 		powerMeter = json_boolean_value(powerMeterJ);
 
+	// threadCount
+	json_t *threadCountJ = json_object_get(rootJ, "threadCount");
+	if (threadCountJ)
+		app()->engine->threadCount = json_integer_value(threadCountJ);
+
 	// checkVersion
 	json_t *checkVersionJ = json_object_get(rootJ, "checkVersion");
 	if (checkVersionJ)

src/system.cpp

@@ -1,4 +1,5 @@
 #include "system.hpp"
+#include <thread>
 #include <dirent.h>
 #include <sys/stat.h>
 
@@ -77,6 +78,11 @@ void createDirectory(const std::string &path) {
 #endif
 }
 
+int getPhysicalCoreCount() {
+	// TODO Return the physical cores, not logical cores.
+	return std::thread::hardware_concurrency();
+}
+
 void setThreadName(const std::string &name) {
 #if defined ARCH_LIN
 	pthread_setname_np(pthread_self(), name.c_str());