Enable font loading for wasm builds.

PiperOrigin-RevId: 842627994
Change-Id: I347f79ec668f31a8bbc4d26638a045e29084d715

src/experimental/platform/window.cc

@@ -41,7 +41,7 @@ extern void* GetNativeWindowOsx(void* window);
 namespace mujoco::platform {
 
 static void InitImGui(SDL_Window* window, const LoadAssetFn& load_asset_fn,
-                      bool build_fonts) {
+                      bool load_fonts, bool build_fonts) {
   ImGui::CreateContext();
 
   ImGuiIO& io = ImGui::GetIO();
@@ -51,8 +51,7 @@ static void InitImGui(SDL_Window* window, const LoadAssetFn& load_asset_fn,
   ImGui::StyleColorsDark();
   ImGui_ImplSDL2_InitForOther(window);
 
-#ifndef __EMSCRIPTEN__
-  // TODO: Get font loading working for wasm.
+  if (load_fonts) {
     // Note: fonts are stored statically because they aren't actually loaded
     // until the fonts are built.
     ImFontConfig main_cfg;
@@ -66,12 +65,12 @@ static void InitImGui(SDL_Window* window, const LoadAssetFn& load_asset_fn,
     constexpr ImWchar icon_ranges[] = {0xf000, 0xf3ff, 0x000};
     io.Fonts->AddFontFromMemoryTTF(icon_font.data(), icon_font.size(), 14.f,
                                   &icon_cfg, icon_ranges);
-#endif
 
     if (build_fonts) {
       io.Fonts->Build();
     }
   }
+}
 
 Window::Window(std::string_view title, int width, int height, Config config,
                const LoadAssetFn& load_asset_fn)
@@ -114,7 +113,8 @@ Window::Window(std::string_view title, int width, int height, Config config,
     mju_error("Error creating window: %s", SDL_GetError());
   }
 
-  InitImGui(sdl_window_, load_asset_fn, (render_config != kClassicOpenGL));
+  InitImGui(sdl_window_, load_asset_fn, config.load_fonts,
+            (render_config != kClassicOpenGL));
 
   if (render_config == kFilamentWebGL || render_config == kClassicOpenGL) {
     SDL_GLContext gl_context = SDL_GL_CreateContext(sdl_window_);

src/experimental/platform/window.h

@@ -40,6 +40,7 @@ class Window {
   struct Config {
     RenderConfig render_config = kClassicOpenGL;
     bool enable_keyboard = true;
+    bool load_fonts = true;
   };
 
   Window(std::string_view title, int width, int height, Config config,