Revert "feat: allow adjustment of compiler threads (#99)"

This reverts commit 07d50a4.

src/Menu.cpp

@@ -14,7 +14,6 @@
 #include "Features/WaterBlending.h"
 
 #define SETTING_MENU_TOGGLEKEY "Toggle Key"
-#define SETTING_MENU_SKIPKEY "Skip Compilation Key"
 #define SETTING_MENU_FONTSCALE "Font Scale"
 
 void SetupImGuiStyle()
@@ -78,9 +77,6 @@ void Menu::Load(json& o_json)
 	if (o_json[SETTING_MENU_TOGGLEKEY].is_number_unsigned()) {
 		toggleKey = o_json[SETTING_MENU_TOGGLEKEY];
 	}
-	if (o_json[SETTING_MENU_SKIPKEY].is_number_unsigned()) {
-		skipCompilationKey = o_json[SETTING_MENU_SKIPKEY];
-	}
 	if (o_json[SETTING_MENU_FONTSCALE].is_number_float()) {
 		fontScale = o_json[SETTING_MENU_FONTSCALE];
 	}
@@ -90,7 +86,6 @@ void Menu::Save(json& o_json)
 {
 	json menu;
 	menu[SETTING_MENU_TOGGLEKEY] = toggleKey;
-	menu[SETTING_MENU_SKIPKEY] = skipCompilationKey;
 	menu[SETTING_MENU_FONTSCALE] = fontScale;
 
 	o_json["Menu"] = menu;
@@ -216,18 +211,11 @@ RE::BSEventNotifyControl Menu::ProcessEvent(RE::InputEvent* const* a_event, RE::
 			switch (button->device.get()) {
 			case RE::INPUT_DEVICE::kKeyboard:
 				if (!button->IsPressed()) {
-					logger::trace("Detected key code {} ({})", KeyIdToString(key), key);
 					if (settingToggleKey) {
 						toggleKey = key;
 						settingToggleKey = false;
-					} else if (settingSkipCompilationKey) {
-						skipCompilationKey = key;
-						settingSkipCompilationKey = false;
 					} else if (key == toggleKey) {
 						IsEnabled = !IsEnabled;
-					} else if (key == skipCompilationKey) {
-						auto& shaderCache = SIE::ShaderCache::Instance();
-						shaderCache.backgroundCompilation = true;
 					}
 				}
 
@@ -424,25 +412,10 @@ void Menu::DrawSettings()
 
 				ImGui::AlignTextToFramePadding();
 				ImGui::SameLine();
-				if (ImGui::Button("Change##toggle")) {
+				if (ImGui::Button("Change")) {
 					settingToggleKey = true;
 				}
 			}
-			if (settingSkipCompilationKey) {
-				ImGui::Text("Press any key to set as Skip Compilation Key...");
-			} else {
-				ImGui::AlignTextToFramePadding();
-				ImGui::Text("Skip Compilation Key:");
-				ImGui::SameLine();
-				ImGui::AlignTextToFramePadding();
-				ImGui::TextColored(ImVec4(1, 1, 0, 1), "%s", KeyIdToString(skipCompilationKey));
-
-				ImGui::AlignTextToFramePadding();
-				ImGui::SameLine();
-				if (ImGui::Button("Change##skip")) {
-					settingSkipCompilationKey = true;
-				}
-			}
 
 			if (ImGui::SliderFloat("Font Scale", &fontScale, -2.f, 2.f, "%.2f")) {
 				float trueScale = exp2(fontScale);
@@ -506,19 +479,9 @@ void Menu::DrawSettings()
 				ImGui::BeginTooltip();
 				ImGui::PushTextWrapPos(ImGui::GetFontSize() * 35.0f);
 				ImGui::Text(
-					"Number of threads to use to compile shaders. "
-					"The more threads the faster compilation will finish but may make the system unresponsive. ");
-				ImGui::PopTextWrapPos();
-				ImGui::EndTooltip();
-			}
-			ImGui::SliderInt("Background Compiler Threads", &shaderCache.backgroundCompilationThreadCount, 1, static_cast<int32_t>(std::thread::hardware_concurrency()));
-			if (ImGui::IsItemHovered()) {
-				ImGui::BeginTooltip();
-				ImGui::PushTextWrapPos(ImGui::GetFontSize() * 35.0f);
-				ImGui::Text(
-					"Number of threads to use to compile shaders while playing game. "
-					"This is activated if the startup compilation is skipped. "
-					"The more threads the faster compilation will finish but may make the system unresponsive. ");
+					"Number of threads to compile shaders with. "
+					"The more threads the faster compilation will finish but may make the system unresponsive. "
+					"This should only be changed between restarts. ");
 				ImGui::PopTextWrapPos();
 				ImGui::EndTooltip();
 			}
@@ -612,9 +575,7 @@ void Menu::DrawOverlay()
 
 	auto failed = shaderCache.GetFailedTasks();
 	auto hide = shaderCache.IsHideErrors();
-	auto progressTitle = fmt::format("{}Compiling Shaders: {}",
-		shaderCache.backgroundCompilation ? "Background " : "",
-		shaderCache.GetShaderStatsString(!state->IsDeveloperMode()).c_str());
+	auto progressTitle = fmt::format("Compiling Shaders: {}", shaderCache.GetShaderStatsString(!state->IsDeveloperMode()).c_str());
 	auto percent = (float)compiledShaders / (float)totalShaders;
 	auto progressOverlay = fmt::format("{}/{} ({:2.1f}%)", compiledShaders, totalShaders, 100 * percent);
 	if (shaderCache.IsCompiling()) {
@@ -626,13 +587,6 @@ void Menu::DrawOverlay()
 		}
 		ImGui::TextUnformatted(progressTitle.c_str());
 		ImGui::ProgressBar(percent, ImVec2(0.0f, 0.0f), progressOverlay.c_str());
-		if (!shaderCache.backgroundCompilation && shaderCache.menuLoaded) {
-			auto skipShadersText = fmt::format(
-				"Press {} to proceed without completing shader compilation. "
-				"WARNING: Uncompiled shaders will have visual errors or cause stuttering when loading.",
-				KeyIdToString(skipCompilationKey));
-			ImGui::TextUnformatted(skipShadersText.c_str());
-		}
 
 		ImGui::End();
 	} else if (failed && !hide) {

src/Menu.h

@@ -27,9 +27,8 @@ class Menu : public RE::BSTEventSink<RE::InputEvent*>
 
 private:
 	uint32_t toggleKey = VK_END;
-	uint32_t skipCompilationKey = VK_ESCAPE;
 	bool settingToggleKey = false;
-	bool settingSkipCompilationKey = false;
+
 	float fontScale = 0.f;  // exponential
 
 	Menu() {}

src/ShaderCache.cpp

@@ -4,7 +4,6 @@
 
 #include <d3d11.h>
 #include <d3dcompiler.h>
-#include <fmt/std.h>
 #include <wrl/client.h>
 
 #include "Features/ExtendedMaterials.h"
@@ -1339,27 +1338,6 @@ namespace SIE
 		Clear();
 	}
 
-	void ShaderCache::AdjustThreadCount()
-	{
-		auto size = compilationThreads.size();
-		if (size == compilationThreadCount)
-			return;
-		if (size && std::this_thread::get_id() != compilationThreads.front().get_id())
-			// only allow first thread to adjust threads
-			return;
-		logger::debug("Adjusting active threads {}/{}", (int)size, (int)compilationThreadCount);
-		if (size && size > compilationThreadCount) {
-			auto& thread = compilationThreads.back();
-			logger::debug("Stopping thread {}: active {}/{}", thread.get_id(), (int)size - 1, (int)compilationThreadCount);
-			thread.request_stop();
-			compilationThreads.pop_back();
-		} else if (size < compilationThreadCount) {
-			compilationThreads.push_back(std::jthread(&ShaderCache::ProcessCompilationSet, this, ssource.get_token()));
-			auto& thread = compilationThreads.back();
-			logger::debug("Starting new thread {}: active {}/{}", thread.get_id(), (int)size + 1, (int)compilationThreadCount);
-		}
-	}
-
 	void ShaderCache::Clear()
 	{
 		for (auto& shaders : vertexShaders) {
@@ -1375,7 +1353,6 @@ namespace SIE
 			shaders.clear();
 		}
 
-		ssource.request_stop();
 		compilationSet.Clear();
 		std::unique_lock lock{ mapMutex };
 		shaderMap.clear();
@@ -1521,8 +1498,10 @@ namespace SIE
 
 	ShaderCache::ShaderCache()
 	{
-		logger::debug("ShaderCache initialized with {} compiler threads", (int)compilationThreadCount);
-		AdjustThreadCount();
+		logger::debug("ShaderCache initialized with {} compiler threads", compilationThreadCount);
+		for (size_t threadIndex = 0; threadIndex < compilationThreadCount; ++threadIndex) {
+			compilationThreads.push_back(std::jthread(&ShaderCache::ProcessCompilationSet, this));
+		}
 	}
 
 	RE::BSGraphics::VertexShader* ShaderCache::MakeAndAddVertexShader(const RE::BSShader& shader,
@@ -1615,16 +1594,13 @@ namespace SIE
 		hideError = !hideError;
 	}
 
-	void ShaderCache::ProcessCompilationSet(std::stop_token stoken)
+	void ShaderCache::ProcessCompilationSet()
 	{
-		SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_BELOW_NORMAL);
-		while (!stoken.stop_requested()) {
-			const auto& task = compilationSet.WaitTake(stoken);
-			if (!task.has_value())
-				break;  // exit because thread told to end
-			task.value().Perform();
-			compilationSet.Complete(task.value());
-			AdjustThreadCount();
+		SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_NORMAL);
+		while (true) {
+			const auto& task = compilationSet.WaitTake();
+			task.Perform();
+			compilationSet.Complete(task);
 		}
 	}
 
@@ -1660,23 +1636,15 @@ namespace SIE
 		return GetId() == other.GetId();
 	}
 
-	std::optional<ShaderCompilationTask> CompilationSet::WaitTake(std::stop_token stoken)
+	ShaderCompilationTask CompilationSet::WaitTake()
 	{
 		std::unique_lock lock(compilationMutex);
-		if (!conditionVariable.wait(
-				lock, stoken,
-				[this, &shaderCache]() { return !availableTasks.empty() &&
-			                                    // check against all tasks in queue to trickle the work. It cannot be the active tasks count because the thread pool itself is maximum.
-			                                    (int)shaderCache.compilationPool.get_tasks_total() <=
-			                                        (!shaderCache.backgroundCompilation ? shaderCache.compilationThreadCount : shaderCache.backgroundCompilationThreadCount); })) {
-			/*Woke up because of a stop request. */
-			return std::nullopt;
-		}
+		conditionVariable.wait(lock, [this]() { return !availableTasks.empty(); });
 		if (!ShaderCache::Instance().IsCompiling()) {  // we just got woken up because there's a task, start clock
 			lastCalculation = lastReset = high_resolution_clock::now();
 		}
 		auto node = availableTasks.extract(availableTasks.begin());
-		auto& task = node.value();
+		auto task = node.value();
 		tasksInProgress.insert(std::move(node));
 		return task;
 	}

src/ShaderCache.h

@@ -60,7 +60,7 @@ namespace SIE
 	class CompilationSet
 	{
 	public:
-		std::optional<ShaderCompilationTask> WaitTake(std::stop_token stoken);
+		ShaderCompilationTask WaitTake();
 		void Add(const ShaderCompilationTask& task);
 		void Complete(const ShaderCompilationTask& task);
 		void Clear();
@@ -77,7 +77,7 @@ namespace SIE
 		std::unordered_set<ShaderCompilationTask> availableTasks;
 		std::unordered_set<ShaderCompilationTask> tasksInProgress;
 		std::unordered_set<ShaderCompilationTask> processedTasks;  // completed or failed
-		std::condition_variable_any conditionVariable;
+		std::condition_variable conditionVariable;
 		std::chrono::steady_clock::time_point lastReset = high_resolution_clock::now();
 		std::chrono::steady_clock::time_point lastCalculation = high_resolution_clock::now();
 		double totalMs = (double)duration_cast<std::chrono::milliseconds>(lastReset - lastReset).count();
@@ -124,11 +124,7 @@ namespace SIE
 		void DeleteDiskCache();
 		void ValidateDiskCache();
 		void WriteDiskCacheInfo();
-		/// <summary>
-		/// Adjust the compiler threads based on the compileThreadCount.
-		/// </summary>
-		/// This will terminate or generate threads as required to match compileThreadCount.
-		void AdjustThreadCount();
+
 		void Clear();
 
 		bool AddCompletedShader(ShaderClass shaderClass, const RE::BSShader& shader, uint32_t descriptor, ID3DBlob* a_blob);
@@ -156,10 +152,6 @@ namespace SIE
 		bool IsHideErrors();
 
 		int32_t compilationThreadCount = std::max(static_cast<int32_t>(std::thread::hardware_concurrency()) - 1, 1);
-		int32_t backgroundCompilationThreadCount = std::max(static_cast<int32_t>(std::thread::hardware_concurrency()) / 2, 1);
-		BS::thread_pool compilationPool{};
-		bool backgroundCompilation = false;
-		bool menuLoaded = false;
 
 		enum class LightingShaderTechniques
 		{
@@ -211,7 +203,7 @@ namespace SIE
 
 	private:
 		ShaderCache();
-		void ProcessCompilationSet(std::stop_token stoken);
+		void ProcessCompilationSet();
 
 		~ShaderCache();
 
@@ -229,7 +221,6 @@ namespace SIE
 		bool hideError = false;
 
 		eastl::vector<std::jthread> compilationThreads;
-		std::stop_source ssource;
 		std::mutex vertexShadersMutex;
 		std::mutex pixelShadersMutex;
 		CompilationSet compilationSet;

src/State.cpp

@@ -95,8 +95,6 @@ void State::Load()
 			SetDefines(advanced["Shader Defines"]);
 		if (advanced["Compiler Threads"].is_number_integer())
 			shaderCache.compilationThreadCount = std::clamp(advanced["Compiler Threads"].get<int32_t>(), 1, static_cast<int32_t>(std::thread::hardware_concurrency()));
-		if (advanced["Background Compiler Threads"].is_number_integer())
-			shaderCache.backgroundCompilationThreadCount = std::clamp(advanced["Compiler Threads"].get<int32_t>(), 1, static_cast<int32_t>(std::thread::hardware_concurrency()));
 	}
 
 	if (settings["General"].is_object()) {
@@ -150,7 +148,6 @@ void State::Save()
 	advanced["Log Level"] = logLevel;
 	advanced["Shader Defines"] = shaderDefinesString;
 	advanced["Compiler Threads"] = shaderCache.compilationThreadCount;
-	advanced["Background Compiler Threads"] = shaderCache.backgroundCompilationThreadCount;
 	settings["Advanced"] = advanced;
 
 	json general;

src/XSEPlugin.cpp

@@ -115,8 +115,8 @@ void MessageHandler(SKSE::MessagingInterface::Message* message)
 				RE::BSInputDeviceManager::GetSingleton()->AddEventSink(Menu::GetSingleton());
 
 				auto& shaderCache = SIE::ShaderCache::Instance();
-				shaderCache.menuLoaded = true;
-				while (shaderCache.IsCompiling() && !shaderCache.backgroundCompilation) {
+
+				while (shaderCache.IsCompiling()) {
 					std::this_thread::sleep_for(100ms);
 				}