Added instance retrieval method to GameWinDX9

I don't like having a singleton with inheritance. At all. It needs to
be removed as soon as possible and functionalities need to be moved
outside of this monolith and this is a step into that direction.

I think.

2 files changed, 20 insertions, 0 deletions

diff --git a/Stars45/GameWinDX9.cpp b/Stars45/GameWinDX9.cpp
index bf7876f..efc825a 100644
--- a/Stars45/GameWinDX9.cpp
+++ b/Stars45/GameWinDX9.cpp
@@ -17,13 +17,28 @@
 #include "Utils.h"
 
 
+GameWinDX9* GameWinDX9::instance = nullptr;
+
+
+GameWinDX9*
+GameWinDX9::GetInstance()
+{
+    return instance;
+}
+
+
 GameWinDX9::GameWinDX9()
 {
+    if (instance != nullptr)
+        Panic::Panic("Multiple instances of GameWinDX9");
+    instance = this;
 }
 
 
 GameWinDX9::~GameWinDX9()
 {
+    if (instance != nullptr)
+        instance = nullptr;
 }
 
 
diff --git a/Stars45/GameWinDX9.h b/Stars45/GameWinDX9.h
index 9151bcd..5193a77 100644
--- a/Stars45/GameWinDX9.h
+++ b/Stars45/GameWinDX9.h
@@ -14,6 +14,8 @@
 class GameWinDX9 : public Game
 {
 public:
+    static GameWinDX9* GetInstance();
+
     GameWinDX9();
     virtual ~GameWinDX9();
 
@@ -28,6 +30,9 @@ public:
 protected:
     PALETTEENTRY      standard_palette[256];
     BYTE              inverse_palette[32768];
+
+private:
+    static GameWinDX9* instance;
 };