Show offscreen buffer in a new window

Programming Questions

kosowski

Show offscreen buffer in a new window

in Programming Questions • 1 month ago

Hi, I'm rendering a 3D scene from two different points of view into two GLGraphicsOffscreen object. One is show in the main window, but now I need to show the other offscreen buffer in a separate window, then, by using frame.setLocation(), I can place one window in the primary display and the other one on the secondary display of an extended desktop (which is a projector).

My first attemp has been to create another sketch from the main one using PApplet.runSketch(), which receives the resulting image through a setImage() method and displays it. I'm passing the buffer by rendering it into a PImage like this.

PImage img = createImage(fpsBuffer.width, fpsBuffer.height, RGB);
fpsBuffer.getTexture().getImage(img);
fpWindow.setImage(img);

The auxiliary sketch just copys the PImage with get() and displays it. But the result has a frame rate around 5 fps

I guess this is due to all the memory copying involved, as both the PImage and the buffer are 1024x768.

Other methods I have found on the forum rely on creating a new PApplet as well, what I think would lead me to the same problem. Is there any method to draw to a new window by reading directly from the buffer object? Or any other idea on how to resolve this?

BTW, I'm working on Windows 8 and Processing 1.5.1. Thanks!

Replies(2)

tfguy44

Re: Show offscreen buffer in a new window

1 month ago

I'm just going to post this... Maybe you can adapt it to work for you. You can just draw your PGraphic's image to the second window with a call something like ew1.image( pg.get(),0,0 );

ExtraWindow ew1;
ExtraWindow ew2;
PImage logo = loadImage("http://www.tfguy44.com/MyIcon1.PNG");
void setup() {
size(400,400);
ew1 = new ExtraWindow(this,"hello-a",100,100,200,200);
ew2 = new ExtraWindow(this,"hello-b",100,300,200,200);
ew1.smooth();
ew2.background(0,255,0);
ew2.image(logo,0,0);
}
void draw() {
ew1.background(0);
ew1.stroke(255,40);
ew1.stroke(0,255,0);
ew1.line(100,100,mouseX,mouseY);
background(0);
fill(255);
text("Move the mouse around in here!", 20, 20);
}
void keyPressed() {
println(key);
switch(key) {
case('1'):
ew1.setUndecorated(true);
break;
case('2'):
ew1.setUndecorated(false);
break;
}
}
void mousePressed() {
ew1.background(0);
}
// class ExtraWindow
import java.awt.event.WindowEvent;
import java.awt.Frame;
import java.awt.Color;
import java.awt.event.WindowListener;
import java.awt.Insets;
import java.awt.event.ComponentListener;
import java.awt.event.ComponentEvent;
import java.awt.event.KeyEvent;
import java.awt.Component;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.awt.GraphicsDevice;
import java.awt.GraphicsEnvironment;
import java.awt.MouseInfo;
class ExtraWindow extends PApplet implements WindowListener, ComponentListener {
protected int width = 600;
protected int height = 200;
protected int x = 100;
protected int y = 100;
protected String myName;
protected String myTitle;
protected boolean isCoordinates = false;
protected boolean isLoop = true;
public final static int NORMAL = 0;
public final static int ECONOMIC = 1;
protected int myMode = NORMAL;
protected String myRenderer = "";
protected int myFrameRate;
boolean isUndecorated = false;
PApplet papplet;
public ExtraWindow(PApplet theApplet) {
super();
papplet = theApplet;
}
public ExtraWindow(PApplet theApplet, String theName, int theWidth, int theHeight) {
this(theApplet,theName, theWidth, theHeight, "", 30);
}
public ExtraWindow(PApplet theApplet, String theName, int theWidth, int theHeight, String theRenderer, int theFrameRate) {
super();
papplet = theApplet;
myName = theName;
myTitle = theName;
width = theWidth;
height = theHeight;
myFrameRate = theFrameRate;
myRenderer = theRenderer;
launch();
}
public ExtraWindow(PApplet theApplet, final String theName, int theX, int theY, int theWidth, int theHeight) {
this(theApplet, theName, theX, theY, theWidth, theHeight, "", 30);
}
public ExtraWindow(PApplet theApplet, String theName, int theX, int theY, int theWidth, int theHeight, String theRenderer, int theFrameRate) {
super();
papplet = theApplet;
myName = theName;
myTitle = theName;
width = theWidth;
height = theHeight;
x = theX;
y = theY;
myFrameRate = theFrameRate;
myRenderer = theRenderer;
launch();
}
public void setup() {
if (myRenderer.length() == 0) {
size(width, height);
}
else {
size(width, height, myRenderer);
}
frameRate(myFrameRate);
}
public void draw() {
}
public Frame getFrame() {
return frame;
}
public String name() {
return myName;
}
public void setVisible(boolean theValue) {
if (theValue == true) {
frame.show();
}
else {
frame.hide();
}
}
public void setResizeable(boolean theValue) {
frame.setResizable(theValue);
}
public void setTitle(String theTitle) {
myTitle = theTitle;
updateTitle();
}
protected void updateTitle() {
String m = myTitle;
if(isCoordinates) {
m += " x:" + x + " y:" + y + " " + width + "x" + height;
}
frame.setTitle(m);
}
public String title() {
return myTitle;
}
public void showCoordinates() {
isCoordinates = true;
updateTitle();
}
public void hideCoordinates() {
isCoordinates = false;
updateTitle();
}
public void windowActivated(WindowEvent e) {
isLoop = true;
loop();
}
public void keyPressed(KeyEvent theKeyEvent) {
papplet.keyPressed(theKeyEvent);
}
public void keyReleased(KeyEvent theKeyEvent) {
papplet.keyReleased(theKeyEvent);
}
public void keyTyped(KeyEvent theKeyEvent) {
papplet.keyTyped(theKeyEvent);
}
int mX;
int mY;
public void mousePressed(){
if(isUndecorated) {
mX = mouseX;
mY = mouseY;
}
}
void mouseDragged(){
if(isUndecorated) {
frame.setLocation(
MouseInfo.getPointerInfo().getLocation().x-mX,
MouseInfo.getPointerInfo().getLocation().y-mY);
}
}
public void windowClosed(WindowEvent e) {
// System.out.println("window closed");
}
public void windowClosing(WindowEvent e) {
dispose();
}
public void windowDeactivated(WindowEvent e) {
if (myMode == ECONOMIC) {
isLoop = false;
noLoop();
}
}
public void windowDeiconified(WindowEvent e) {
}
public void windowIconified(WindowEvent e) {
}
public void windowOpened(WindowEvent e) {
}
public void componentHidden(ComponentEvent e) {
}
public void componentMoved(ComponentEvent e) {
Component c = e.getComponent();
x = c.getLocation().x;
y = c.getLocation().y;
updateTitle();
}
public void componentResized(ComponentEvent e) {
Component c = e.getComponent();
// System.out.println("componentResized event from " +
// c.getClass().getName() + "; new size: " + c.getSize().width
// + ", " + c.getSize().height);
}
public void componentShown(ComponentEvent e) {
// System.out.println("componentShown event from " +
// e.getComponent().getClass().getName());
}
public void setMode(int theValue) {
if (theValue == ECONOMIC) {
myMode = ECONOMIC;
return;
}
myMode = NORMAL;
}
public void toggleUndecorated() {
setUndecorated(!isUndecorated());
}
public void setUndecorated(boolean theFlag) {
if (theFlag != isUndecorated()) {
isUndecorated = theFlag;
frame.removeNotify();
frame.setUndecorated(isUndecorated);
setSize(width, height);
setBounds(0, 0, width, height);
frame.setSize(width, height);
frame.addNotify();
requestFocus();
}
}
public boolean isUndecorated() {
return isUndecorated;
}
void dispose() {
stop();
removeAll();
frame.removeAll();
frame.dispose();
}
private void launch() {
GraphicsDevice displayDevice = null;
if (displayDevice == null) {
GraphicsEnvironment environment = GraphicsEnvironment.getLocalGraphicsEnvironment();
displayDevice = environment.getDefaultScreenDevice();
}
frame = new Frame(displayDevice.getDefaultConfiguration());
// remove the grow box by default
// users who want it back can call frame.setResizable(true)
frame.setResizable(false);
init();
frame.pack(); // get insets. get more.
frame.setLocation(x,y);
Insets insets = frame.getInsets();
int windowW = Math.max(width, MIN_WINDOW_WIDTH) + insets.left + insets.right;
int windowH = Math.max(height, MIN_WINDOW_HEIGHT) + insets.top + insets.bottom;
frame.setSize(windowW, windowH);
frame.setLayout(null);
frame.add(this);
int usableWindowH = windowH - insets.top - insets.bottom;
setBounds((windowW - width) / 2, insets.top + (usableWindowH - height) / 2, width, height);
frame.addWindowListener(this);
frame.addComponentListener(this);
frame.setName(myName);
frame.setTitle(myName + " x:" + x + " y:" + y + " w:" + width + " h:" + height);
frame.setVisible(true);
requestFocus();
}
}

kosowski

Re: Re: Show offscreen buffer in a new window

1 month ago

Thanks a lot tfguy, pretty much what I needed!

The frame rate has dropped from 30 fps to 20 using JAVA2D, is it possible to use glgraphics as renderer so I can draw the gltexture object? By creating an ExtraWindow with GLConstants.GLGRAPHICS as renderer the image is drawn in the main window instead of the extra window. GLGraphics has an object GLTextureWindow to render a texture into a different window by sharing the context, but on my windows 8 machine it crashes every single time.

Thanks again

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