ctrl: add menu entries to show dear imgui userguide and about window

src/doompanning.cc

@@ -1,6 +1,7 @@
 #include <nng/nng.h>
 
 #include <imgui.h>
+#include <imgui_internal.h>
 #include <backends/imgui_impl_sdl.h>
 #include <backends/imgui_impl_sdlrenderer.h>
 #include <SDL.h>
@@ -23,6 +24,7 @@
 #include "dp_util.hpp"
 
 #if DoomBytesPerPixel == 3
+// FIXME: don't use, it's buggy
 static const u32 DoomSdlTexturePixelFormat = SDL_PIXELFORMAT_RGB888;
 #elif DoomBytesPerPixel == 4
 static const u32 DoomSdlTexturePixelFormat = SDL_PIXELFORMAT_ARGB8888;
@@ -30,7 +32,6 @@ static const u32 DoomSdlTexturePixelFormat = SDL_PIXELFORMAT_ARGB8888;
 #error Unhandled DoomBytesPerPixel value. Which SDL_PIXELFORMAT to use?
 #endif
 
-
 void dp_sdl_fatal(const char *const msg)
 {
     log_fatal("%s: %s", msg, SDL_GetError());
@@ -206,14 +207,14 @@ void check_on_dooms(ControllerContext &ctx)
         }
     }
 
-    // FIXME: We can miss Endoom state updates when nng has to drop message due
+    // FIXME: We can miss Endoom state updates when nng has to drop messages due
     // to queue size limits. If this happens for an externally started doom it
     // will never be removed from ctx.dooms (waitpid() does not work because the
     // doom is not our child). Use DoomState::tLastActive and a fixed timeout
     // value to timeout dooms and erase them from ctx.dooms.
 }
 
-#define DP_DO_DEBUG_DRAWING
+//#define DP_DO_DEBUG_DRAWING
 #ifdef DP_DO_DEBUG_DRAWING
 #include "debug_draw.cc"
 #endif
@@ -437,12 +438,17 @@ ControllerActions run_ui(ControllerContext &ctx)
 #endif
     static bool show_app_metrics = false;
     static bool show_app_debug_log = false;
+    static bool show_app_about = false;
+
     static bool show_log_window = true;
+    static bool show_userguide = false;
 
     if (show_app_metrics)
         ImGui::ShowMetricsWindow(&show_app_metrics);
     if (show_app_debug_log)
         ImGui::ShowDebugLogWindow(&show_app_debug_log);
+    if (show_app_about)
+        ImGui::ShowAboutWindow(&show_app_about);
 
     const ImGuiViewport* main_viewport = ImGui::GetMainViewport();
 
@@ -453,6 +459,17 @@ ControllerActions run_ui(ControllerContext &ctx)
         ctx.appLog.Draw("log");
     }
 
+    if (show_userguide)
+    {
+        ImGui::SetNextWindowPos(ImVec2(main_viewport->WorkPos.x + 666, main_viewport->WorkPos.y + 420), ImGuiCond_FirstUseEver);
+        ImGui::SetNextWindowSize(ImVec2(500, 360), ImGuiCond_FirstUseEver);
+        if (ImGui::Begin("Dear ImGui User Guide", &show_userguide))
+        {
+            ImGui::ShowUserGuide();
+            ImGui::End();
+        }
+    }
+
     ImGui::SetNextWindowPos(ImVec2(main_viewport->WorkPos.x + 20, main_viewport->WorkPos.y + 20), ImGuiCond_FirstUseEver);
     ImGui::SetNextWindowSize(ImVec2(420, 340), ImGuiCond_FirstUseEver);
     ImGuiWindowFlags window_flags = ImGuiWindowFlags_MenuBar;
@@ -476,18 +493,25 @@ ControllerActions run_ui(ControllerContext &ctx)
     {
         if (ImGui::BeginMenu("Menu"))
         {
-            ImGui::MenuItem("Log Window", nullptr, &show_log_window);
             ImGui::MenuItem("Quit", "Ctrl+Q", &ctx.quit, true);
             ImGui::EndMenu();
         }
 
         if (ImGui::BeginMenu("Tools"))
         {
+            ImGui::MenuItem("Log Window", nullptr, &show_log_window);
             ImGui::MenuItem("Dear ImGui Metrics/Debugger", NULL, &show_app_metrics, has_debug_tools);
             ImGui::MenuItem("Dear ImGui Debug Log", NULL, &show_app_debug_log, has_debug_tools);
             ImGui::EndMenu();
         }
 
+        if (ImGui::BeginMenu("Help"))
+        {
+            ImGui::MenuItem("Dear ImGui User Guide", NULL, &show_userguide);
+            ImGui::MenuItem("About Dear ImGui", NULL, &show_app_about);
+            ImGui::EndMenu();
+        }
+
         ImGui::EndMenuBar();
     }
 
@@ -683,12 +707,15 @@ int main(int argc, char *argv[])
         dp_sdl_fatal("SDL_CreateRenderer");
 
     IMGUI_CHECKVERSION();
-    ImGui::CreateContext();
+    auto imgui = ImGui::CreateContext();
     ImGui::GetIO().IniFilename = "doompanning_ui.ini";
     ImGui::StyleColorsDark();
     ImGui_ImplSDL2_InitForSDLRenderer(window, renderer);
     ImGui_ImplSDLRenderer_Init(renderer);
 
+    //ImGuiSettingsHandler dpSettingsHandler;
+    //imgui->SettingsHandlers.push_back(dpSettingsHandler);
+
     //dp_nng_init_limits(1, 1, 1); // int ncpu_max, int pool_thread_limit_max, int resolv_thread_limit
     //nng_set_ncpu_max(ncpu_max);
     //nng_set_pool_thread_limit_max(pool_thread_limit_max);