SDL: Let SdlGraphicsManager inherit from GraphicsManager.

3 files changed, 5 insertions, 6 deletions

diff --git a/backends/graphics/opengl/opengl-graphics.h b/backends/graphics/opengl/opengl-graphics.h
index d2d0358407..93c0c5bc83 100644
--- a/backends/graphics/opengl/opengl-graphics.h
+++ b/backends/graphics/opengl/opengl-graphics.h
@@ -47,7 +47,7 @@ enum {
 	GFX_NEAREST = 1
 };
 
-class OpenGLGraphicsManager : public GraphicsManager {
+class OpenGLGraphicsManager : virtual public GraphicsManager {
 public:
 	OpenGLGraphicsManager();
 	virtual ~OpenGLGraphicsManager();
diff --git a/backends/graphics/sdl/sdl-graphics.h b/backends/graphics/sdl/sdl-graphics.h
index 4d4338af16..ebf8078f23 100644
--- a/backends/graphics/sdl/sdl-graphics.h
+++ b/backends/graphics/sdl/sdl-graphics.h
@@ -23,6 +23,8 @@
 #ifndef BACKENDS_GRAPHICS_SDL_SDLGRAPHICS_H
 #define BACKENDS_GRAPHICS_SDL_SDLGRAPHICS_H
 
+#include "backends/graphics/graphics.h"
+
 #include "common/rect.h"
 
 class SdlEventSource;
@@ -31,11 +33,8 @@ class SdlEventSource;
  * Base class for a SDL based graphics manager.
  *
  * It features a few extra a few extra features required by SdlEventSource.
- * FIXME/HACK:
- * Note it does not inherit from GraphicsManager to avoid a diamond inheritance
- * in the current OpenGLSdlGraphicsManager.
  */
-class SdlGraphicsManager {
+class SdlGraphicsManager : virtual public GraphicsManager {
 public:
 	SdlGraphicsManager(SdlEventSource *source);
 	virtual ~SdlGraphicsManager();
diff --git a/backends/graphics/surfacesdl/surfacesdl-graphics.h b/backends/graphics/surfacesdl/surfacesdl-graphics.h
index 00c05ff2bf..22b7780675 100644
--- a/backends/graphics/surfacesdl/surfacesdl-graphics.h
+++ b/backends/graphics/surfacesdl/surfacesdl-graphics.h
@@ -75,7 +75,7 @@ public:
 /**
  * SDL graphics manager
  */
-class SurfaceSdlGraphicsManager : public GraphicsManager, public SdlGraphicsManager, public Common::EventObserver {
+class SurfaceSdlGraphicsManager : public SdlGraphicsManager, public Common::EventObserver {
 public:
 	SurfaceSdlGraphicsManager(SdlEventSource *sdlEventSource);
 	virtual ~SurfaceSdlGraphicsManager();