Added antialiasing flag to the ScreenUtils. (libgdx#7286)

gdx/src/com/badlogic/gdx/utils/ScreenUtils.java

@@ -56,9 +56,19 @@ public static void clear (Color color, boolean clearDepth) {
 	/** Clears the color buffers and optionally the depth buffer.
 	 * @param clearDepth Clears the depth buffer if true. */
 	public static void clear (float r, float g, float b, float a, boolean clearDepth) {
+		clear(r, g, b, a, clearDepth, false);
+	}
+
+	/** Clears the color buffers, optionally the depth buffer and whether to apply antialiasing (requires to set number of samples
+	 * in the launcher class).
+	 *
+	 * @param clearDepth Clears the depth buffer if true.
+	 * @param applyAntialiasing applies multi-sampling for antialiasing if true. */
+	public static void clear (float r, float g, float b, float a, boolean clearDepth, boolean applyAntialiasing) {
 		Gdx.gl.glClearColor(r, g, b, a);
 		int mask = GL20.GL_COLOR_BUFFER_BIT;
 		if (clearDepth) mask = mask | GL20.GL_DEPTH_BUFFER_BIT;
+		if (applyAntialiasing && Gdx.graphics.getBufferFormat().coverageSampling) mask = mask | GL20.GL_COVERAGE_BUFFER_BIT_NV;
 		Gdx.gl.glClear(mask);
 	}