Add a function that clears the window with a specified color.

src/sdl/window.cpp

@@ -83,6 +83,15 @@ void twindow::clear()
 	}
 }
 
+void twindow::clear(Uint8 r, Uint8 g, Uint8 b, Uint8 a)
+{
+	SDL_SetRenderDrawColor(*this, r, g, b, a);
+	if(SDL_RenderClear(*this) != 0) {
+		throw texception("Failed to clear the SDL_Renderer object.",
+						 true);
+	}
+}
+
 void twindow::render()
 {
 	SDL_RenderPresent(*this);

src/sdl/window.hpp

@@ -101,6 +101,15 @@ public:
 	/** Clears the contents of the window. */
 	void clear();
 
+	/**
+	 * Clears the contents of the window with a given color.
+	 *
+	 * @param r                   Red value of the color.
+	 * @param g                   Green value of the color.
+	 * @param b                   Blue value of the color.
+	 */
+	void clear(Uint8 r, Uint8 g, Uint8 b, Uint8 a = 0);
+
 	/** Renders the contents of the window. */
 	void render();