Implement HTML5 cancel/ok button swap on Windows.

Platform is detected on init via the `navigator.platform` string.

2 files changed, 18 insertions, 0 deletions

diff --git a/platform/javascript/display_server_javascript.cpp b/platform/javascript/display_server_javascript.cpp
index 4b69ed5814..2fd1f45939 100644
--- a/platform/javascript/display_server_javascript.cpp
+++ b/platform/javascript/display_server_javascript.cpp
@@ -831,6 +831,17 @@ DisplayServer *DisplayServerJavaScript::create_func(const String &p_rendering_dr
 DisplayServerJavaScript::DisplayServerJavaScript(const String &p_rendering_driver, WindowMode p_mode, uint32_t p_flags, const Vector2i &p_resolution, Error &r_error) {
 	r_error = OK; // Always succeeds for now.
 
+	/* clang-format off */
+	swap_cancel_ok = EM_ASM_INT({
+		const win = (['Windows', 'Win64', 'Win32', 'WinCE']);
+		const plat = navigator.platform || "";
+		if (win.indexOf(plat) !== -1) {
+			return 1;
+		}
+		return 0;
+	}) == 1;
+	/* clang-format on */
+
 	RasterizerDummy::make_current(); // TODO GLES2 in Godot 4.0... or webgpu?
 #if 0
 	EmscriptenWebGLContextAttributes attributes;
@@ -1183,6 +1194,10 @@ int DisplayServerJavaScript::get_current_video_driver() const {
 	return 1;
 }
 
+bool DisplayServerJavaScript::get_swap_cancel_ok() {
+	return swap_cancel_ok;
+}
+
 void DisplayServerJavaScript::swap_buffers() {
 	//emscripten_webgl_commit_frame();
 }
diff --git a/platform/javascript/display_server_javascript.h b/platform/javascript/display_server_javascript.h
index b149665d67..6569ef1e42 100644
--- a/platform/javascript/display_server_javascript.h
+++ b/platform/javascript/display_server_javascript.h
@@ -56,6 +56,8 @@ class DisplayServerJavaScript : public DisplayServer {
 	int last_width = 0;
 	int last_height = 0;
 
+	bool swap_cancel_ok = false;
+
 	// utilities
 	static Point2 compute_position_in_canvas(int p_x, int p_y);
 	static void focus_canvas();
@@ -195,6 +197,7 @@ public:
 	virtual void set_icon(const Ref<Image> &p_icon);
 
 	// others
+	virtual bool get_swap_cancel_ok();
 	virtual void swap_buffers();
 
 	static void register_javascript_driver();