Nah, let's roll our own

external/imgui/CMakeLists.txt

@@ -7,4 +7,5 @@ list(APPEND SOURCES backends/imgui_impl_sdl3.cpp backends/imgui_impl_vulkan.cpp)
 
 add_library(imgui ${SOURCES} ${HEADERS})
 target_include_directories(imgui PRIVATE . backends ../SDL/include)
-target_compile_definitions(imgui PRIVATE IMGUI_IMPL_VULKAN_USE_VOLK)
+target_compile_definitions(imgui PRIVATE IMGUI_IMPL_VULKAN_USE_VOLK)
+target_compile_definitions(imgui PRIVATE IMGUI_IMPL_VULKAN_NO_PROTOTYPES)

src/frontend/EmuThread.cpp

@@ -1,13 +1,13 @@
 #include <EmuThread.hpp>
 #include <SDL3/SDL.h>
 
-EmuThread::EmuThread(RenderWidget& renderWidget, SettingsWindow &settings) noexcept :
+EmuThread::EmuThread(RenderWidget &renderWidget, SettingsWindow &settings) noexcept :
     renderWidget(renderWidget), core(parallel), settings(settings) {}
 
 [[noreturn]] void EmuThread::run() noexcept {
-  parallel.Init(renderWidget.instance, renderWidget.wsiPlatform, renderWidget.windowInfo,
+  parallel.Init(renderWidget.qtVkInstanceFactory, renderWidget.wsiPlatform, renderWidget.windowInfo,
                 core.cpu->GetMem().GetRDRAMPtr());
-  renderWidget.InitImgui(parallel.wsi);
+
   SDL_InitSubSystem(SDL_INIT_GAMEPAD);
   bool controllerConnected = false;
 
@@ -15,7 +15,7 @@ EmuThread::EmuThread(RenderWidget& renderWidget, SettingsWindow &settings) noexc
     Util::warn("[SDL] Could not load game controller DB");
   }
 
-  auto pollEvents = [&]() {
+  auto pollEvents = [&] {
     SDL_Event e;
     while (SDL_PollEvent(&e)) {
       switch (e.type) {

src/frontend/RenderWidget.cpp

@@ -1,82 +1,5 @@
 #include <KaizenQt.hpp>
 #include <RenderWidget.hpp>
-#include <imgui.h>
-#include <imgui_impl_sdl3.h>
-#include <imgui_impl_vulkan.h>
-
-static void check_vk_result(VkResult err) {
-  if (err == 0)
-    return;
-  fprintf(stderr, "[vulkan] Error: VkResult = %d\n", err);
-  if (err < 0)
-    abort();
-}
-
-void RenderWidget::InitImgui(std::shared_ptr<Vulkan::WSI>& wsi) {
-  this->wsi = wsi;
-  IMGUI_CHECKVERSION();
-  ImGui::CreateContext();
-  ImGuiIO &io = ImGui::GetIO();
-  (void)io;
-  io.ConfigFlags |= ImGuiConfigFlags_DockingEnable;
-  io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable;
-
-  ImGui::StyleColorsDark();
-  ImGuiStyle &style = ImGui::GetStyle();
-  style.WindowRounding = 0.0f;
-  style.Colors[ImGuiCol_WindowBg].w = 1.0f;
-
-  ImGui_ImplSDL3_InitForVulkan(sdlWindow);
-
-  auto myVkInstance = instance->qVkInstance.vkInstance();
-
-  volkInitialize();
-  volkLoadInstance(myVkInstance);
-
-  ImGui_ImplVulkan_LoadFunctions(
-    [](const char *function_name, void *instance) {
-      return vkGetInstanceProcAddr(static_cast<VkInstance>(instance), function_name);
-    },
-    myVkInstance);
-
-  ImGui_ImplVulkan_InitInfo init_info = {};
-  init_info.Instance = myVkInstance;
-  init_info.PhysicalDevice = wsi->get_device().get_physical_device();
-  init_info.Device = wsi->get_device().get_device();
-  init_info.QueueFamily = wsi->get_context().get_queue_info().family_indices[Vulkan::QUEUE_INDEX_GRAPHICS];
-  init_info.Queue = wsi->get_context().get_queue_info().queues[Vulkan::QUEUE_INDEX_GRAPHICS];
-  init_info.PipelineCache = nullptr;
-  {
-    VkDescriptorPoolSize pool_sizes[] = {
-      {VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, 1},
-    };
-    VkDescriptorPoolCreateInfo pool_info = {};
-    pool_info.sType = VK_STRUCTURE_TYPE_DESCRIPTOR_POOL_CREATE_INFO;
-    pool_info.flags = VK_DESCRIPTOR_POOL_CREATE_FREE_DESCRIPTOR_SET_BIT;
-    pool_info.maxSets = 1;
-    pool_info.poolSizeCount = IM_ARRAYSIZE(pool_sizes);
-    pool_info.pPoolSizes = pool_sizes;
-    auto err = wsi->get_device().get_device_table().vkCreateDescriptorPool(wsi->get_device().get_device(), &pool_info,
-                                                                           nullptr, &init_info.DescriptorPool);
-    check_vk_result(err);
-  }
-
-  init_info.RenderPass =
-    wsi->get_device()
-      .request_render_pass(wsi->get_device().get_swapchain_render_pass(Vulkan::SwapchainRenderPass::ColorOnly), false)
-      .get_render_pass();
-  init_info.Subpass = 0;
-  init_info.MinImageCount = 2;
-  init_info.ImageCount = 2;
-  init_info.MSAASamples = VK_SAMPLE_COUNT_1_BIT;
-  init_info.Allocator = nullptr;
-  init_info.CheckVkResultFn = check_vk_result;
-  ImGui_ImplVulkan_Init(&init_info);
-
-  connect(&timer, &QTimer::timeout, this, &RenderWidget::UpdateEvents);
-  timer.setInterval(16);
-  timer.start();
-}
 
 RenderWidget::RenderWidget(QWidget *parent) : QWidget(parent) {
   setAttribute(Qt::WA_NativeWindow);
@@ -95,43 +18,10 @@ RenderWidget::RenderWidget(QWidget *parent) : QWidget(parent) {
     Util::panic("Could not initialize Vulkan ICD");
   }
 
-  instance = std::make_shared<QtInstanceFactory>();
-  windowHandle()->setVulkanInstance(&instance->qVkInstance);
+  qtVkInstanceFactory = std::make_shared<QtInstanceFactory>();
+  windowHandle()->setVulkanInstance(&qtVkInstanceFactory->handle);
   windowHandle()->create();
 
   wsiPlatform = std::make_shared<QtWSIPlatform>(windowHandle());
   windowInfo = std::make_shared<QtParallelRdpWindowInfo>(windowHandle());
-
-  auto winPtr = reinterpret_cast<void *>(winId());
-  auto props = SDL_CreateProperties();
-#ifdef SDL_PLATFORM_LINUX
-  SDL_SetPointerProperty(props, SDL_PROP_WINDOW_CREATE_WAYLAND_WL_SURFACE_POINTER, winPtr);
-  SDL_SetNumberProperty(props, SDL_PROP_WINDOW_X11_WINDOW_NUMBER, static_cast<s64> winPtr);
-#elif SDL_PLATFORM_WINDOWS
-  SDL_SetPointerProperty(props, SDL_PROP_WINDOW_CREATE_WIN32_HWND_POINTER, winPtr);
-#else
-  SDL_SetPointerProperty(props, SDL_PROP_WINDOW_CREATE_COCOA_WINDOW_POINTER, winPtr);
-#endif
-  sdlWindow = SDL_CreateWindowWithProperties(props);
-}
-
-void RenderWidget::UpdateEvents() {
-  SDL_Event event;
-  while (SDL_PollEvent(&event)) {
-    ImGui_ImplSDL3_ProcessEvent(&event);
-  }
-
-  Util::IntrusivePtr<Vulkan::CommandBuffer> cmd = wsi->get_device().request_command_buffer();
-
-  ImGui_ImplVulkan_NewFrame();
-  ImGui_ImplSDL3_NewFrame();
-  ImGui::NewFrame();
-
-  ImGui::ShowDemoWindow();
-
-  ImGui::Render();
-  ImGui_ImplVulkan_RenderDrawData(ImGui::GetDrawData(), cmd->get_command_buffer());
-
-  ImGui::UpdatePlatformWindows();
-  ImGui::RenderPlatformWindowsDefault();
 }

src/frontend/RenderWidget.hpp

@@ -6,12 +6,11 @@
 #include <QWidget>
 #include <QWindow>
 #include <QTimer>
-
-#include <SDL3/SDL.h>
+#include <imgui_impl_vulkan.h>
 
 struct QtInstanceFactory : Vulkan::InstanceFactory {
   VkInstance create_instance(const VkInstanceCreateInfo *info) override {
-    qVkInstance.setApiVersion({1, 3, 0});
+    handle.setApiVersion({1, 3, 0});
     QByteArrayList exts;
     for (int i = 0; i < info->enabledExtensionCount; i++) {
       exts.push_back(QByteArray::fromStdString(info->ppEnabledExtensionNames[i]));
@@ -20,15 +19,15 @@ struct QtInstanceFactory : Vulkan::InstanceFactory {
     for (int i = 0; i < info->enabledLayerCount; i++) {
       layers.push_back(QByteArray::fromStdString(info->ppEnabledLayerNames[i]));
     }
-    qVkInstance.setExtensions(exts);
-    qVkInstance.setLayers(layers);
-    qVkInstance.setApiVersion({1, 3, 0});
-    qVkInstance.create();
+    handle.setExtensions(exts);
+    handle.setLayers(layers);
+    handle.setApiVersion({1, 3, 0});
+    handle.create();
 
-    return qVkInstance.vkInstance();
+    return handle.vkInstance();
   }
 
-  QVulkanInstance qVkInstance;
+  QVulkanInstance handle;
 };
 
 class QtParallelRdpWindowInfo : public ParallelRDP::WindowInfo {
@@ -81,20 +80,15 @@ public:
 };
 
 class RenderWidget : public QWidget {
-  SDL_Window *sdlWindow;
-  QTimer timer;
-  void UpdateEvents();
-  std::shared_ptr<Vulkan::WSI> wsi;
-
 public:
+  [[nodiscard]] VkInstance instance() const { return qtVkInstanceFactory->handle.vkInstance(); }
   explicit RenderWidget(QWidget *parent);
-  void InitImgui(std::shared_ptr<Vulkan::WSI> &wsi);
 
   [[nodiscard]] QPaintEngine *paintEngine() const override { return nullptr; }
 
   std::shared_ptr<ParallelRDP::WindowInfo> windowInfo;
   std::shared_ptr<Vulkan::WSIPlatform> wsiPlatform;
-  std::shared_ptr<QtInstanceFactory> instance;  
+  std::shared_ptr<QtInstanceFactory> qtVkInstanceFactory;
 Q_SIGNALS:
   void Show() { show(); }
   void Hide() { hide(); }