From 58d4fd6c2b110a15e65bf4b6b900ad41a49a6b41 Mon Sep 17 00:00:00 2001
From: Nick Gasson <nick@nickg.me.uk>
Date: Sat, 30 Aug 2008 16:32:55 +0100
Subject: [PATCH] Implement a super awesome hack to reload images on Windows

---
 src/Asteroid.cpp |  1 +
 src/LoadOnce.hpp | 18 ++++++++++++++++--
 src/Main.cpp     |  6 +++++-
 3 files changed, 22 insertions(+), 3 deletions(-)

diff --git a/src/Asteroid.cpp b/src/Asteroid.cpp
index a2566c9..76d502c 100644
--- a/src/Asteroid.cpp
+++ b/src/Asteroid.cpp
@@ -24,6 +24,7 @@ Texture *Asteroid::surfTexture[Surface::NUM_SURF_TEX];
 Asteroid::Asteroid()
 {
    LOAD_ONCE {
+      cout << "Loading asteroids..." << endl;
       surfTexture[0] = new Texture("images/dirt_surface2.png");
       surfTexture[1] = new Texture("images/snow_surface2.png");
       surfTexture[2] = new Texture("images/red_rock_surface2.png");
diff --git a/src/LoadOnce.hpp b/src/LoadOnce.hpp
index 156bf17..eef9c96 100644
--- a/src/LoadOnce.hpp
+++ b/src/LoadOnce.hpp
@@ -18,8 +18,22 @@
 #ifndef INC_LOADONCE_HPP
 #define INC_LOADONCE_HPP
 
+/*
+ * The global variable _forceReload can be used to force all images
+ * to reload. This works around an SDL bug (?) on Windows where all
+ * texture information is lost after the resolution is changed.
+ *
+ * This is really a bit of a hack, but quite cool, eh? The variable
+ * _forceReload gets incremented each time we have to reload the
+ * images, and the static variable _hasLoaded in each constructor
+ * stores the value of _forceReload the last time the images were
+ * loaded -- we reload if the values differ.
+ */
+
+extern int _forceReload;
+
 #define LOAD_ONCE \
-   static bool _hasLoaded = false; \
-   if (!_hasLoaded && (_hasLoaded = true))
+   static int _hasLoaded = 0; \
+   if ((_forceReload > _hasLoaded) && (_hasLoaded = _forceReload))
 
 #endif
diff --git a/src/Main.cpp b/src/Main.cpp
index 55d40a4..0f3e86f 100644
--- a/src/Main.cpp
+++ b/src/Main.cpp
@@ -44,6 +44,9 @@ static void DestroyScreens()
       delete options;
 }
 
+// See LoadOnce.hpp
+int _forceReload = 1;
+
 /*
  * Recreate all the screens. After a resolution switch for
  * example.
@@ -51,7 +54,8 @@ static void DestroyScreens()
 void RecreateScreens()
 {
    DestroyScreens();
-   
+
+   _forceReload++;
    menu = new MainMenu();
    game = new Game();
    scores = new HighScores();
-- 
2.39.2