From 96a116d7034e19071dd33dffd5155eae632ff02d Mon Sep 17 00:00:00 2001
From: Maik Macho <nuda1998@gmail.com>
Date: Fri, 27 Oct 2017 00:20:12 +0200
Subject: [PATCH] Runtime env settings: XNATOFNA_DISPLAY_SIZE=WxH &
 XNATOFNA_DISPLAY_FULLSCREEN=1 / 0

---
 src/Helper/XnaToFnaHelper.cs  | 25 +++++++++++++++++++++++++
 src/XnaToFnaUtil.Processor.cs |  4 ++++
 2 files changed, 29 insertions(+)

diff --git a/src/Helper/XnaToFnaHelper.cs b/src/Helper/XnaToFnaHelper.cs
index 8dbcc1c..0ef8079 100644
--- a/src/Helper/XnaToFnaHelper.cs
+++ b/src/Helper/XnaToFnaHelper.cs
@@ -63,6 +63,31 @@ public static IntPtr GetProxyFormHandle(this GameWindow window) {
         // Only used when --hook-istrialmode / --arr is provided when patching.
         public static bool get_IsTrialMode()
             => Environment.GetEnvironmentVariable("XNATOFNA_ISTRIALMODE") != "0";
+
+        // This needs to be hooked to check for the env vars at runtime.
+        public static void ApplyChanges(GraphicsDeviceManager self) {
+            string forceFullscreen = Environment.GetEnvironmentVariable("XNATOFNA_DISPLAY_FULLSCREEN");
+            if (forceFullscreen == "0")
+                self.IsFullScreen = false;
+            else if (forceFullscreen == "1")
+                self.IsFullScreen = true;
+
+            int forceWidth;
+            if (int.TryParse(Environment.GetEnvironmentVariable("XNATOFNA_DISPLAY_WIDTH"), out forceWidth))
+                self.PreferredBackBufferWidth = forceWidth;
+            int forceHeight;
+            if (int.TryParse(Environment.GetEnvironmentVariable("XNATOFNA_DISPLAY_HEIGHT"), out forceHeight))
+                self.PreferredBackBufferHeight = forceHeight;
+            string[] forceSize = Environment.GetEnvironmentVariable("XNATOFNA_DISPLAY_SIZE").Split('x');
+            if (forceSize.Length == 2) {
+                if (int.TryParse(forceSize[0], out forceWidth))
+                    self.PreferredBackBufferWidth = forceWidth;
+                if (int.TryParse(forceSize[1], out forceHeight))
+                    self.PreferredBackBufferHeight = forceHeight;
+            }
+
+            self.ApplyChanges();
+        }
         
         public static void PreUpdate(GameTime time) {
             // Don't ask me why some games use Win32 calls instead of Keyboard.GetState()...
diff --git a/src/XnaToFnaUtil.Processor.cs b/src/XnaToFnaUtil.Processor.cs
index b703685..4adc4df 100644
--- a/src/XnaToFnaUtil.Processor.cs
+++ b/src/XnaToFnaUtil.Processor.cs
@@ -34,6 +34,10 @@ public void SetupHelperRelinker() {
             Modder.RelinkMap["System.IntPtr Microsoft.Xna.Framework.GameWindow::get_Handle()"] =
                 Tuple.Create("XnaToFna.XnaToFnaHelper", "System.IntPtr GetProxyFormHandle(Microsoft.Xna.Framework.GameWindow)");
 
+            // X360 games can be larger than the screen. Allow the user to "fix" this by forcing a display resolution via env vars.
+            Modder.RelinkMap["System.Void Microsoft.Xna.Framework.GraphicsDeviceManager::ApplyChanges()"] =
+                Tuple.Create("XnaToFna.XnaToFnaHelper", "System.Void ApplyChanges(Microsoft.Xna.Framework.GraphicsDeviceManager)");
+
             // Let's just completely wreck everything.
             foreach (Type type in typeof(Form).Assembly.GetTypes()) {
                 string name = type.FullName;