Prefer SDL X11 video driver on Linux for ImGui viewport support.

SConstruct

@@ -5,7 +5,7 @@ env = SConscript('external/scons-plus-plus/SConscript', exports = ['config'])
 env.Append(CPPPATH = [Dir('private'), Dir('public')])
 
 # add the default recipe repository
-env.RecipeRepo('mewin-stable', 'https://git.mewin.de/mewin/spp_recipes.git', 'stable')
+env.RecipeRepo('mewin', 'https://git.mewin.de/mewin/spp_recipes.git', 'stable')
 
 # library
 env = env.Module('private/raid/SModule')

private/raid/SModule

@@ -4,7 +4,7 @@ import json
 Import('env')
 
 if not hasattr(env, 'Jinja'):
-    env.Error('RAID requires the Jinja tool.')
+    env.Error('RAID requires Jinja.')
 
 src_files = Split("""
     application.cpp

private/raid/application.cpp

@@ -13,6 +13,7 @@
 #include <mijin/virtual_filesystem/mapping.hpp>
 #include <mijin/virtual_filesystem/relative.hpp>
 #include <imgui.h>
+#include <imgui_internal.h>
 #include <backends/imgui_impl_opengl3.h>
 #include <backends/imgui_impl_sdl3.h>
 #include <stb_image.h>
@@ -289,6 +290,11 @@ void Application::handleSDLEvent(const SDL_Event& event)
     }
 }
 
+void Application::handleSDLError(const char* message)
+{
+    msgError("SDL: {}", message);
+}
+
 bool Application::init()
 {
     auto addConfigDir = [&](const fs::path& path)
@@ -419,12 +425,19 @@ void Application::cleanup()
 
 bool Application::initSDL()
 {
-    if (!SDL_Init(0))
+#if MIJIN_TARGET_OS == MIJIN_OS_LINUX
+    // prefer x11 over wayland, as ImGui viewports don't work with wayland
+    // TODO: this still doesn't work all the time, maybe there will be an update to ImGui in the future?
+    SDL_SetHint(SDL_HINT_VIDEO_DRIVER, "x11,wayland");
+#endif
+    if (!SDL_Init(SDL_INIT_VIDEO))
     {
         msgError("Error initializing SDL: {}.", SDL_GetError());
         return false;
     }
 
+    msgInfo("SDL video driver: {}", SDL_GetCurrentVideoDriver());
+
     // GL attributes must be set before window creation
     SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
     SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 1);
@@ -475,12 +488,18 @@ bool Application::initImGui()
 {
     IMGUI_CHECKVERSION(); // not exactly useful when using static libs, but won't hurt
 
-    if (ImGui::CreateContext() == nullptr)
+    ImGuiContext* imguiContext = ImGui::CreateContext();
+    if (imguiContext == nullptr)
     {
         msgError("Error initializing ImGui context.");
         return false;
     }
 
+    imguiContext->ErrorCallbackUserData = this;
+    imguiContext->ErrorCallback = [](ImGuiContext* /* ctx */, void* userData, const char* msg) {
+        static_cast<Application*>(userData)->handleSDLError(msg);
+    };
+
     loadImGuiConfig();
 
     configureImgui();
@@ -503,6 +522,16 @@ bool Application::initImGui()
         return false;
     }
 
+    if (imguiIO.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
+    {
+        if (!(imguiIO.BackendFlags & ImGuiBackendFlags_PlatformHasViewports)) {
+            msgWarning("ImGUI viewports enabled, but platform doesn't support them.");
+        }
+        if (!(imguiIO.BackendFlags & ImGuiBackendFlags_RendererHasViewports)) {
+            msgWarning("ImGUI viewports enabled, but renderer doesn't support them.");
+        }
+    }
+
     // init font
     if (imguiIO.Fonts->Fonts.empty())
     {

private/raid_test/SModule

@@ -3,6 +3,8 @@ Import('env')
 
 src_files = Split("""
     main.cpp
+    
+    application.cpp
 """)
 
 prog_app = env.UnityProgram(

private/raid_test/application.cpp

@@ -0,0 +1,57 @@
+
+#include "raid_test/application.hpp"
+
+namespace raid_test
+{
+Application gApplication;
+
+bool Application::init()
+{
+    if (!raid::Application::init()) {
+        return false;
+    }
+    setMainWindowFlags(raid::DEFAULT_MAIN_WINDOW_FLAGS | ImGuiWindowFlags_MenuBar | ImGuiWindowFlags_NoDocking);
+    setMainWindowStyle(ImGuiStyleVar_WindowPadding, ImVec2());
+    setMainWindowStyle(ImGuiStyleVar_WindowBorderSize, 0.f);
+    return true;
+}
+
+void Application::configureImgui()
+{
+    raid::Application::configureImgui();
+    ImGuiIO& imguiIO = ImGui::GetIO();
+    imguiIO.ConfigFlags |= ImGuiConfigFlags_DockingEnable;
+}
+
+void Application::render()
+{
+    if (ImGui::BeginMenuBar())
+    {
+        if (ImGui::BeginMenu("File"))
+        {
+            if (ImGui::MenuItem("Quit"))
+            {
+                requestQuit();
+            }
+            ImGui::EndMenu();
+        }
+        ImGui::EndMenuBar();
+    }
+    ImGui::Text("hi");
+
+    ImGui::ShowMetricsWindow();
+    ImGui::Begin("Test");
+    ImGui::Text("Test Content");
+    ImGui::End();
+}
+
+std::string Application::getFolderName()
+{
+    return "raid_test_app";
+}
+
+std::string Application::getWindowTitle()
+{
+    return "RAID Test Application";
+}
+} // namespace raid_test

private/raid_test/application.hpp

@@ -0,0 +1,24 @@
+
+#pragma once
+
+#if !defined(RAID_TEST_APPLICATION_HPP_INCLUDED)
+#define RAID_TEST_APPLICATION_HPP_INCLUDED 1
+
+#include "raid/raid.hpp"
+
+namespace raid_test
+{
+class Application : public raid::Application
+{
+protected:
+    bool init() override;
+    void configureImgui() override;
+    void render() override;
+    std::string getFolderName() override;
+    std::string getWindowTitle() override;
+};
+
+extern Application gApplication;
+} // namespace raid_test
+
+#endif // !defined(RAID_TEST_APPLICATION_HPP_INCLUDED)

private/raid_test/main.cpp

@@ -1,40 +1,7 @@
 
-#include "raid/raid.hpp"
+#include "./application.hpp"
-
-#include <imgui.h>
-
-namespace
-{
-void render()
-{
-    if (ImGui::BeginMenuBar())
-    {
-        if (ImGui::BeginMenu("File"))
-        {
-            if (ImGui::MenuItem("Quit"))
-            {
-                raid::QuickApp::get().requestQuit();
-            }
-            ImGui::EndMenu();
-        }
-        ImGui::EndMenuBar();
-    }
-    ImGui::Text("hi");
-
-    ImGui::Begin("Test");
-        ImGui::Text("Test Content");
-    ImGui::End();
-}
-}
 
 int main(int argc, char* argv[])
 {
-    return raid::runQuick(argc, argv, {
+    return raid_test::gApplication.run(argc, argv);
-        .callbacks = {
-            .render = &render
-        },
-        .folderName = "raid_test_app",
-        .windowTitle = "RAID Test App",
-        .mainWindowFlags = raid::DEFAULT_MAIN_WINDOW_FLAGS | ImGuiWindowFlags_MenuBar
-    });
 }

public/raid/raid.hpp

@@ -138,6 +138,7 @@ protected:
     virtual void initMemoryFS();
     virtual void handleMessage(const Message& message);
     virtual void handleSDLEvent(const SDL_Event& event);
+    virtual void handleSDLError(const char* message);
 
     void msgInfo(const char* text)
     {