Add Emscripten support for SDL2 and SDL3 surface examples

examples/example_sdl3_surface/main.cpp

@@ -3,6 +3,9 @@
 #include "imgui_impl_sdlsurface3.h"
 #include <SDL3/SDL.h>
 #include <stdio.h>
+#ifdef __EMSCRIPTEN__
+#include "../libs/emscripten/emscripten_mainloop_stub.h"
+#endif
 
 int main(int, char**)
 {
@@ -49,6 +52,9 @@ int main(int, char**)
     ImGuiIO& io = ImGui::GetIO();
     io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;
     io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad;
+#ifdef __EMSCRIPTEN__
+    io.IniFilename = nullptr;
+#endif
 
     ImGui::StyleColorsDark();
 
@@ -64,7 +70,11 @@ int main(int, char**)
     ImVec4 clear_color = ImVec4(0.45f, 0.55f, 0.60f, 1.00f);
     bool done = false;
 
+#ifdef __EMSCRIPTEN__
+    EMSCRIPTEN_MAINLOOP_BEGIN
+#else
     while (!done)
+#endif
     {
         SDL_Event event;
         while (SDL_PollEvent(&event))
@@ -160,6 +170,9 @@ int main(int, char**)
             SDL_UpdateWindowSurface(window);
         }
     }
+#ifdef __EMSCRIPTEN__
+    EMSCRIPTEN_MAINLOOP_END;
+#endif
 
     ImGui_ImplSDLSurface3_Shutdown();
     ImGui_ImplSDL3_Shutdown();