We do a little saving (Widget + json serialization)

src/frontend/App.cpp

@@ -12,7 +12,7 @@ void App::Run() {
   SDL_EventState(SDL_DROPFILE, SDL_ENABLE);
 
   while (!core.done) {
-    core.Run(window, window.volumeL, window.volumeR);
+    core.Run(window, window.settings.GetVolumeL(), window.settings.GetVolumeL());
     core.UpdateController(state);
 
     SDL_Event event;

src/frontend/Settings.cpp

@@ -0,0 +1,158 @@
+#include <Settings.hpp>
+#include <fstream>
+#include <filesystem>
+#include <imgui.h>
+
+using namespace std::filesystem;
+
+Settings::Settings(n64::Core& core) {
+  auto modes = std::fstream::in | std::fstream::out;
+  auto fileExists = exists("resources/settings.json");
+  if(!fileExists) {
+    modes |= std::fstream::trunc;
+  }
+  std::fstream settingsFile{"resources/settings.json", modes};
+  if(fileExists) {
+    settings = json::parse(settingsFile);
+    auto entryCpuType = settings["cpu"]["type"];
+    if(!entryCpuType.empty()) {
+      cpuType = entryCpuType.get<std::string>();
+      if(cpuType == "dynarec") {
+        core.cpuType = n64::CpuType::Dynarec;
+      } else if(cpuType == "interpreter") {
+        core.cpuType = n64::CpuType::Interpreter;
+      } else {
+        util::panic("Unrecognized cpu type: {}\n", cpuType);
+      }
+    } else {
+      settingsFile.clear();
+      settings["cpu"]["type"] = "dynarec";
+      settingsFile << settings;
+      core.cpuType = n64::CpuType::Dynarec;
+    }
+
+    auto volumeREntry = settings["audio"]["volumeR"];
+    if(!volumeREntry.empty()) {
+      auto value = volumeREntry.get<float>();
+      volumeR = value;
+    } else {
+      settingsFile.clear();
+      settings["audio"]["volumeR"] = 0.5;
+      settingsFile << settings;
+      volumeR = 0.5;
+    }
+    auto volumeLEntry = settings["audio"]["volumeL"];
+    if(!volumeLEntry.empty()) {
+      auto value = volumeLEntry.get<float>();
+      volumeL = value;
+    } else {
+      settingsFile.clear();
+      settings["audio"]["volumeL"] = 0.5;
+      settingsFile << settings;
+      volumeL = 0.5;
+    }
+    auto lockChannelsEntry = settings["audio"]["lockChannels"];
+    if(!lockChannelsEntry.empty()) {
+      auto value = lockChannelsEntry.get<bool>();
+      lockChannels = value;
+    } else {
+      settingsFile.clear();
+      settings["audio"]["lockChannels"] = true;
+      settingsFile << settings;
+      lockChannels = true;
+    }
+  } else {
+    settings["cpu"]["type"] = "dynarec";
+    settings["audio"]["volumeR"] = 0.5;
+    settings["audio"]["volumeL"] = 0.5;
+    settings["audio"]["lockChannels"] = true;
+
+    core.cpuType = n64::CpuType::Dynarec;
+    volumeR = 0.5;
+    volumeL = 0.5;
+    lockChannels = true;
+
+    settingsFile << settings;
+  }
+
+  settingsFile.close();
+}
+
+Settings::~Settings() {
+  auto modes = std::fstream::out;
+  auto fileExists = exists("resources/settings.json");
+  if(fileExists) {
+    modes |= std::fstream::trunc;
+
+    std::fstream settingsFile{"resources/settings.json", modes};
+
+    settings["cpu"]["type"] = cpuType;
+    settings["audio"]["volumeR"] = volumeR;
+    settings["audio"]["volumeL"] = volumeL;
+    settings["audio"]["lockChannels"] = lockChannels;
+    settingsFile << settings;
+    settingsFile.close();
+  }
+}
+
+void Settings::RenderWidget(bool& show) {
+  if(show) {
+    ImGui::OpenPopup("Settings");
+    if(ImGui::BeginPopupModal("Settings", &show)) {
+      static enum { CPU, Audio } category = CPU;
+      if(ImGui::Button("CPU")) {
+        category = CPU;
+      }
+      ImGui::SameLine();
+      if(ImGui::Button("Audio")) {
+        category = Audio;
+      }
+      ImGui::Separator();
+      if(category == Audio) {
+        ImGui::Checkbox("Lock channels", &lockChannels);
+        ImGui::SliderFloat("Volume L", &volumeL, 0, 1, "%.2f", ImGuiSliderFlags_NoInput);
+        if (!lockChannels) {
+          ImGui::SliderFloat("Volume R", &volumeR, 0, 1, "%.2f", ImGuiSliderFlags_NoInput);
+        } else {
+          volumeR = volumeL;
+          ImGui::BeginDisabled();
+          ImGui::SliderFloat("Volume R", &volumeR, 0, 1, "%.2f", ImGuiSliderFlags_NoInput);
+          ImGui::EndDisabled();
+        }
+      } else if(category == CPU) {
+        const char* items[] = { "JIT", "Interpreter" };
+        static int currentIndex = [this]() {
+          if(cpuType == "dynarec") return 0;
+          else if(cpuType == "interpreter") return 1;
+          return 0;
+        }();
+
+        if(ImGui::BeginCombo("CPU type", items[currentIndex])) {
+          for (int n = 0; n < 2; n++) {
+            const bool is_selected = (currentIndex == n);
+            if (ImGui::Selectable(items[n], is_selected)) {
+              currentIndex = n;
+            }
+
+            if (is_selected) {
+              ImGui::SetItemDefaultFocus();
+            }
+          }
+
+          if(currentIndex == 0) {
+            cpuType = "dynarec";
+          }
+          if(currentIndex == 1) {
+            cpuType = "interpreter";
+          }
+          ImGui::EndCombo();
+        }
+      }
+      ImGui::EndPopup();
+    }
+
+    SetLockChannels(lockChannels);
+    SetVolumeL(volumeL);
+    SetVolumeR(volumeR);
+  }
+}

src/frontend/Settings.hpp

@@ -0,0 +1,27 @@
+#pragma once
+#include <nlohmann/json.hpp>
+#include <Core.hpp>
+
+using namespace nlohmann;
+
+struct Settings {
+  Settings(n64::Core&);
+  ~Settings();
+
+  float GetVolumeL() const { return volumeL; };
+  float GetVolumeR() const { return volumeR; };
+  bool GetLockChannels() const { return lockChannels; }
+  std::string GetCpuType() const { return cpuType; }
+
+  void SetVolumeL(float v) { volumeL = v; };
+  void SetVolumeR(float v) { volumeR = v; };
+  void SetLockChannels(bool v) { lockChannels = v; }
+  void SetCpuType(std::string v) { cpuType = v; }
+
+  void RenderWidget(bool& show);
+private:
+  std::string cpuType = "interpreter";
+  float volumeL = 0.0, volumeR = 0.0;
+  bool lockChannels = true;
+  json settings;
+};

src/frontend/imgui/Window.cpp

@@ -1,17 +1,14 @@
+#include <filesystem>
 #include <Window.hpp>
 #include <nfd.hpp>
 #include <Core.hpp>
 #include <Audio.hpp>
-#include <nlohmann/json.hpp>
-#include <filesystem>
 #include <SDL.h>
 
 VkInstance instance{};
-using json = nlohmann::json;
 
-Window::Window(n64::Core& core) {
+Window::Window(n64::Core& core) : settings(core) {
   InitSDL();
-  LoadSettings(core);
   InitParallelRDP(core.mem.GetRDRAM(), window);
   InitImgui();
   NFD::Init();
@@ -22,34 +19,6 @@ Window::Window(n64::Core& core) {
       && event.window.windowID == SDL_GetWindowID(window);
 }
 
-void Window::LoadSettings(n64::Core &core) {
-  settingsFile.open("settings.json", std::fstream::in | std::fstream::out);
-  if(settingsFile.is_open()) {
-    settings = json::parse(settingsFile);
-    auto entryCpuType = settings["cpu_type"];
-    if(!entryCpuType.empty()) {
-      auto cpuType = entryCpuType.get<std::string>();
-      if(cpuType == "dynarec") {
-        core.cpuType = n64::CpuType::Dynarec;
-      } else if(cpuType == "interpreter") {
-        core.cpuType = n64::CpuType::Interpreter;
-      } else {
-        util::panic("Unrecognized cpu type: {}\n", cpuType);
-      }
-    } else {
-      settings["cpu_type"] = "dynarec";
-      settingsFile << settings;
-      core.cpuType = n64::CpuType::Dynarec;
-    }
-  } else {
-    settings["cpu_type"] = "dynarec";
-    settingsFile << settings;
-    core.cpuType = n64::CpuType::Dynarec;
-  }
-
-  settingsFile.close();
-}
-
 void Window::InitSDL() {
   SDL_Init(SDL_INIT_EVERYTHING);
   n64::InitAudio();
@@ -217,6 +186,7 @@ void Window::Render(n64::Core& core) {
     SDL_SetWindowTitle(window, windowTitle.c_str());
     windowTitle = shadowWindowTitle;
   }
+
   static bool showSettings = false;
   bool showMainMenuBar = windowID == SDL_GetWindowID(SDL_GetMouseFocus());
   if(showMainMenuBar) {
@@ -277,21 +247,7 @@ void Window::Render(n64::Core& core) {
     ImGui::EndMainMenuBar();
   }
 
-  if(showSettings) {
-    ImGui::OpenPopup("Settings");
-    if(ImGui::BeginPopupModal("Settings", &showSettings)) {
-      ImGui::Checkbox("Lock channels", &lockVolume);
-      ImGui::SliderFloat("Volume L", &volumeL, 0, 1, "%.2f", ImGuiSliderFlags_NoInput);
-      if (!lockVolume) {
-        ImGui::SliderFloat("Volume R", &volumeR, 0, 1, "%.2f", ImGuiSliderFlags_NoInput);
-      } else {
-        volumeR = volumeL;
-        ImGui::BeginDisabled();
-        ImGui::SliderFloat("Volume R", &volumeR, 0, 1, "%.2f", ImGuiSliderFlags_NoInput);
-        ImGui::EndDisabled();
-      }
-      ImGui::EndPopup();
-    }
-  }
+  settings.RenderWidget(showSettings);
+
   ImGui::PopFont();
 }

src/frontend/imgui/Window.hpp

@@ -6,9 +6,7 @@
 #include <SDL.h>
 #include <Core.hpp>
 #include <vector>
-#include <nlohmann/json.hpp>
-
-using namespace nlohmann;
+#include <Settings.hpp>
 
 struct Window {
   explicit Window(n64::Core& core);
@@ -18,12 +16,9 @@ struct Window {
   [[nodiscard]] bool gotClosed(SDL_Event event);
   ImFont *uiFont{}, *codeFont{};
   u32 windowID{};
-  float volumeL = 0.0, volumeR = 0.0;
+  Settings settings;
   void LoadROM(n64::Core& core, const std::string& path);
 private:
-  json settings;
-  std::fstream settingsFile;
-  bool lockVolume = true;
   SDL_Window* window{};
   std::string windowTitle{"Gadolinium"};
   std::string shadowWindowTitle{windowTitle};
@@ -31,7 +26,6 @@ private:
   void InitSDL();
   void InitImgui();
   void Render(n64::Core& core);
-  void LoadSettings(n64::Core&);
 
   VkPhysicalDevice physicalDevice{};
   VkDevice device{};