From 27eb53e1a1557bfb1e26109280851d7ad6de851b Mon Sep 17 00:00:00 2001
From: Wojtek Figat <wojtek@figat.pl>
Date: Fri, 20 Feb 2026 23:47:01 +0100
Subject: [PATCH] Fix web window to maintain canvas size on start

---
 Source/Engine/Engine/Web/WebGame.h         |  3 +++
 Source/Engine/Platform/Web/WebPlatform.cpp | 11 +++++++++++
 2 files changed, 14 insertions(+)

diff --git a/Source/Engine/Engine/Web/WebGame.h b/Source/Engine/Engine/Web/WebGame.h
index f65ba4a93..366c4f5a1 100644
--- a/Source/Engine/Engine/Web/WebGame.h
+++ b/Source/Engine/Engine/Web/WebGame.h
@@ -12,6 +12,9 @@
 /// <seealso cref="Game" />
 class WebGame : public GameBase
 {
+public:
+    // [GameBase]
+    static void InitMainWindowSettings(CreateWindowSettings& settings);
 };
 
 typedef WebGame Game;
diff --git a/Source/Engine/Platform/Web/WebPlatform.cpp b/Source/Engine/Platform/Web/WebPlatform.cpp
index 4400d1af9..3a820f5de 100644
--- a/Source/Engine/Platform/Web/WebPlatform.cpp
+++ b/Source/Engine/Platform/Web/WebPlatform.cpp
@@ -13,6 +13,7 @@
 #include "Engine/Platform/CPUInfo.h"
 #include "Engine/Platform/MemoryStats.h"
 #include "Engine/Profiler/ProfilerCPU.h"
+#include "Engine/Engine/Web/WebGame.h"
 #include "Engine/Utilities/StringConverter.h"
 #include <chrono>
 #include <dlfcn.h>
@@ -28,6 +29,16 @@ namespace
     double DateStart = emscripten_get_now();
 };
 
+void WebGame::InitMainWindowSettings(CreateWindowSettings& settings)
+{
+    // Set window size matching the canvas item in HTML
+    settings.Fullscreen = false;
+    int width = 1, height = 1;
+    emscripten_get_canvas_element_size(WEB_CANVAS_ID, &width, &height);
+    settings.Size.X = width;
+    settings.Size.Y = height;
+}
+
 void WebFileSystem::GetSpecialFolderPath(const SpecialFolder type, String& result)
 {
     result = TEXT("/");