Add Emscripten support for SDL2 and SDL3 surface examples

examples/example_sdl2_surface/main.cpp

@@ -6,6 +6,9 @@
 #include "imgui_impl_sdlsurface2.h"
 #include <SDL.h>
 #include <stdio.h>
+#ifdef __EMSCRIPTEN__
+#include "../libs/emscripten/emscripten_mainloop_stub.h"
+#endif
 
 int main(int, char**)
 {
@@ -55,6 +58,9 @@ int main(int, char**)
     ImGuiIO& io = ImGui::GetIO(); (void)io;
     io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;     // Enable Keyboard Controls
     io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad;      // Enable Gamepad Controls
+#ifdef __EMSCRIPTEN__
+    io.IniFilename = nullptr;
+#endif
 
     // Setup Dear ImGui style
     ImGui::StyleColorsDark();
@@ -76,7 +82,11 @@ int main(int, char**)
 
     // Main loop
     bool done = false;
+#ifdef __EMSCRIPTEN__
+    EMSCRIPTEN_MAINLOOP_BEGIN
+#else
     while (!done)
+#endif
     {
         // Poll and handle events (inputs, window resize, etc.)
         SDL_Event event;
@@ -174,6 +184,9 @@ int main(int, char**)
         SDL_BlitSurface(framebuffer, nullptr, window_surface, nullptr);
         SDL_UpdateWindowSurface(window);
     }
+#ifdef __EMSCRIPTEN__
+    EMSCRIPTEN_MAINLOOP_END;
+#endif
 
     ImGui_ImplSDLSurface2_Shutdown();
     ImGui_ImplSDL2_Shutdown();