SDL: Add a OpenGL SDL backend and hook it into the SDL backend.

The hooking code is nearly exactly the old hooking code. Only the OpenGL SDL
creation has been adapted since it uses a different constructor now.

2 files changed, 8 insertions, 0 deletions

diff --git a/backends/graphics/opengl/opengl-graphics.cpp b/backends/graphics/opengl/opengl-graphics.cpp
index 7ea880c92e..87d6d3c2e5 100644
--- a/backends/graphics/opengl/opengl-graphics.cpp
+++ b/backends/graphics/opengl/opengl-graphics.cpp
@@ -106,6 +106,10 @@ const OSystem::GraphicsMode glGraphicsModes[] = {
 
 } // End of anonymous namespace
 
+const OSystem::GraphicsMode *OpenGLGraphicsManager::supportedGraphicsModes() {
+	return glGraphicsModes;
+}
+
 const OSystem::GraphicsMode *OpenGLGraphicsManager::getSupportedGraphicsModes() const {
 	return glGraphicsModes;
 }
diff --git a/backends/graphics/opengl/opengl-graphics.h b/backends/graphics/opengl/opengl-graphics.h
index e21bda4b8a..5aa521cb7a 100644
--- a/backends/graphics/opengl/opengl-graphics.h
+++ b/backends/graphics/opengl/opengl-graphics.h
@@ -47,6 +47,10 @@ public:
 	virtual void setFeatureState(OSystem::Feature f, bool enable);
 	virtual bool getFeatureState(OSystem::Feature f);
 
+	// HACK: This is required for the SDL backend to switch between OpenGL SDL
+	// and Surface SDL.
+	static const OSystem::GraphicsMode *supportedGraphicsModes();
+
 	virtual const OSystem::GraphicsMode *getSupportedGraphicsModes() const;
 	virtual int getDefaultGraphicsMode() const;
 	virtual bool setGraphicsMode(int mode);