From 9d30fe3d34d984f381beff18e96a02ca2f6fc68e Mon Sep 17 00:00:00 2001
From: ericek111 <erik.brocko@letemsvetemapplem.eu>
Date: Wed, 25 Mar 2026 22:55:44 +0100
Subject: [PATCH] wasm: add a fullscreen button

---
 src/ui/Application.cpp | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/src/ui/Application.cpp b/src/ui/Application.cpp
index 27093cd..d316d8d 100644
--- a/src/ui/Application.cpp
+++ b/src/ui/Application.cpp
@@ -7,7 +7,21 @@
 
 #ifdef __EMSCRIPTEN__
 #include <emscripten.h>
+#include <emscripten/html5.h>
 #include <GLES2/gl2.h>
+
+EM_JS(void, js_toggleFullscreen, (), {
+    if (document.fullscreenElement) {
+        document.exitFullscreen();
+    } else {
+        document.documentElement.requestFullscreen();
+    }
+});
+
+EM_JS(int, js_isFullscreen, (), {
+    return document.fullscreenElement ? 1 : 0;
+});
+
 #else
 #include <GL/gl.h>
 #endif
@@ -369,6 +383,12 @@ void Application::render() {
             ImGui::EndMenu();
         }
 
+#ifdef __EMSCRIPTEN__
+        if (ImGui::SmallButton(js_isFullscreen() ? "Exit Fullscreen" : "Fullscreen")) {
+            js_toggleFullscreen();
+        }
+#endif
+
         // Right-aligned status in menu bar
         {
             float barW = ImGui::GetWindowWidth();