From 01d8530ee1e7dc977ca24d7b733533eb8f6cabd7 Mon Sep 17 00:00:00 2001
From: Cameron Cawley <ccawley2011@gmail.com>
Date: Sat, 17 Jun 2023 17:01:58 +0100
Subject: [PATCH] Implement Toggle_Video_Fullscreen with SDL 1.2

---
 common/video_sdl1.cpp | 18 ++++++++++++++++++
 common/wwkeyboard.cpp | 12 ++++++++++--
 2 files changed, 28 insertions(+), 2 deletions(-)

diff --git a/common/video_sdl1.cpp b/common/video_sdl1.cpp
index c5bbf524..28e1a017 100644
--- a/common/video_sdl1.cpp
+++ b/common/video_sdl1.cpp
@@ -157,6 +157,24 @@ bool Set_Video_Mode(int w, int h, int bits_per_pixel)
 void Toggle_Video_Fullscreen()
 {
     Settings.Video.Windowed = !Settings.Video.Windowed;
+
+    if (window) {
+        int win_flags = SDL_HWSURFACE | SDL_HWPALETTE;
+        SDL_Surface* new_window;
+
+        if (!Settings.Video.Windowed) {
+            win_flags |= SDL_FULLSCREEN;
+        }
+
+        new_window = SDL_SetVideoMode(window->w, window->h, 8, win_flags);
+        if (new_window) {
+            window = new_window;
+
+            /* The palette needs to be restored when switching to a new video mode */
+            SDL_SetPalette(window, SDL_LOGPAL, logpal, 0, 256);
+            SDL_SetPalette(window, SDL_PHYSPAL, physpal, 0, 256);
+        }
+    }
 }
 
 void Get_Video_Scale(float& x, float& y)
diff --git a/common/wwkeyboard.cpp b/common/wwkeyboard.cpp
index b7f2d683..adcb7ed3 100644
--- a/common/wwkeyboard.cpp
+++ b/common/wwkeyboard.cpp
@@ -551,7 +551,11 @@ void WWKeyboardClass::Fill_Buffer_From_System(void)
 #ifdef SDL2_BUILD
             Put_Key_Message(event.key.keysym.scancode, false);
 #else
-            Put_Key_Message(event.key.keysym.sym, false);
+            if (event.key.keysym.sym == SDLK_RETURN && (event.key.keysym.mod & KMOD_ALT)) {
+                /* Switching to full screen is handled in the key up event */
+            } else {
+                Put_Key_Message(event.key.keysym.sym, false);
+            }
 #endif
             break;
         case SDL_KEYUP:
@@ -562,7 +566,11 @@ void WWKeyboardClass::Fill_Buffer_From_System(void)
                 Put_Key_Message(event.key.keysym.scancode, true);
             }
 #else
-            Put_Key_Message(event.key.keysym.sym, true);
+            if (event.key.keysym.sym == SDLK_RETURN && (event.key.keysym.mod & KMOD_ALT)) {
+                Toggle_Video_Fullscreen();
+            } else {
+                Put_Key_Message(event.key.keysym.sym, true);
+            }
 #endif
             break;
         case SDL_MOUSEMOTION: