SYSTEM: Add side textures as a System feature

backends/graphics/surfacesdl/surfacesdl-graphics.h

@@ -113,9 +113,12 @@ public:
 	virtual int16 getOverlayHeight() { return _overlayHeight; }
 	virtual int16 getOverlayWidth() { return _overlayWidth; }
 	void closeOverlay(); // ResidualVM specific method
-#ifdef SDL_BACKEND
+
+	/* Render the passed Surfaces besides the game texture.
+	 * This is used for widescreen support in the Grim engine.
+	 * Note: we must copy the Surfaces, as they are free()d after this call.
+	 */
 	virtual void setSideTextures(Graphics::Surface *left, Graphics::Surface *right);
-#endif
 
 	virtual bool showMouse(bool visible);
 	virtual void warpMouse(int x, int y);

backends/platform/sdl/sdl.cpp

@@ -438,3 +438,17 @@ Common::TimerManager *OSystem_SDL::getTimerManager() {
 	return _timerManager;
 #endif
 }
+
+// ResidualVM specific code
+bool OSystem_SDL::hasFeature(Feature f) {
+	if (f == kFeatureSideTextures)
+		return true;
+	return ModularBackend::hasFeature(f);
+}
+
+// ResidualVM specific code
+void OSystem_SDL::suggestSideTextures(Graphics::Surface *left,
+                                      Graphics::Surface *right) {
+	SurfaceSdlGraphicsManager *ssgm = dynamic_cast<SurfaceSdlGraphicsManager *>(_graphicsManager);
+	ssgm->setSideTextures(left, right);
+}

backends/platform/sdl/sdl.h

@@ -77,6 +77,11 @@ public:
 	virtual Audio::Mixer *getMixer();
 	virtual Common::TimerManager *getTimerManager();
 
+	// ResidualVM specific code
+	virtual bool hasFeature(Feature f);
+	// ResidualVM specific code
+	virtual void suggestSideTextures(Graphics::Surface *left,
+	                                 Graphics::Surface *right) override;
 protected:
 	bool _inited;
 	bool _initedSDL;

common/system.h

@@ -313,6 +313,8 @@ public:
 		//ResidualVM specific
 		kFeatureOpenGL,
 		kFeatureVirtControls,
+		// Can side textures be rendered on the side for widescreen support?
+		kFeatureSideTextures,
 
 		/**
 		 * The presence of this feature indicates whether the displayLogFile()
@@ -666,6 +668,21 @@ public:
 
 	virtual Graphics::PixelBuffer setupScreen(uint screenW, uint screenH, bool fullscreen, bool accel3d) = 0;
 
+	/**
+	 * Suggest textures to render at the side of the game window.
+	 * This enables eg. Grim to render the game in a widescreen format.
+	 * 
+	 * The system must take a copy of the Surfaces, as they will be free()d
+	 * automatically.
+	 *
+	 * !!! ResidualVM specific method: !!!
+	 *
+	 * @param left			Texture to be used on the left
+	 * @param height		Texture to be used on the right
+	 */
+	virtual void suggestSideTextures(Graphics::Surface *left,
+	                                 Graphics::Surface *right) {};
+
 	/**
 	 * Returns the currently set virtual screen height.
 	 * @see initSize