Added a Pbuffer constructor that omits the RenderTexture parameter, and added a note that FBOs should be used instead, if available. Render-to-texture pbuffers can only be available on Windows platforms and is thus not portable.

src/java/org/lwjgl/opengl/Pbuffer.java

@@ -158,6 +158,24 @@ public final class Pbuffer implements Drawable {
 		Sys.initialize();
 	}
 
+	/**
+	 * Create an instance of a Pbuffer with a unique OpenGL context. The buffer is single-buffered.
+	 * <p/>
+	 * NOTE: The Pbuffer will have its own context that shares display lists and textures with <code>shared_context</code>,
+	 * or, if <code>shared_context</code> is <code>null</code>, the Display context if it is created. The Pbuffer
+	 * will have its own OpenGL state. Therefore, state changes to a pbuffer will not be seen in the window context and vice versa.
+	 * <p/>
+	 *
+	 * @param width         Pbuffer width
+	 * @param height        Pbuffer height
+	 * @param pixel_format  Minimum Pbuffer context properties
+	 * @param shared_drawable If non-null the Pbuffer will share display lists and textures with it. Otherwise, the Pbuffer will share
+	 * 						 with the Display context (if created).
+	 */
+	public Pbuffer(int width, int height, PixelFormat pixel_format, Drawable shared_drawable) throws LWJGLException {
+		this(width, height, pixel_format, null, shared_drawable);
+	}
+
 	/**
 	 * Create an instance of a Pbuffer with a unique OpenGL context. The buffer is single-buffered.
 	 * <p/>
@@ -167,7 +185,8 @@ public final class Pbuffer implements Drawable {
 	 * <p/>
 	 * The renderTexture parameter defines the necessary state for enabling render-to-texture. When this parameter is null,
 	 * render-to-texture is not available. Before using render-to-texture, the Pbuffer capabilities must be queried to ensure that
-	 * it is supported.
+	 * it is supported. Currently only windows platform can support this feature, so it is recommended that EXT_framebuffer_object
+	 * or similar is used if available, for maximum portability.
 	 * <p/>
 	 *
 	 * @param width         Pbuffer width